Init ppg extractor and ppg2mel (#375)

* Init  ppg extractor and ppg2mel

* add preprocess and training

* FIx known issues

* Update __init__.py

Allow to gen audio

* Fix length issue

* Fix bug of preparing fid

* Fix sample issues

* Add UI usage of PPG-vc

.gitignore

@@ -15,9 +15,8 @@
 *.toc
 *.wav
 *.sh
-synthesizer/saved_models/*
-vocoder/saved_models/*
-encoder/saved_models/*
-cp_hifigan/*
-!vocoder/saved_models/pretrained/*
+*/saved_models
+!vocoder/saved_models/pretrained/**
 !encoder/saved_models/pretrained.pt
+wavs
+log

.vscode/launch.json

@@ -35,6 +35,14 @@
       "console": "integratedTerminal",
       "args": ["-d","..\\audiodata"]
     },
+    {
+      "name": "Python: Demo Box VC",
+      "type": "python",
+      "request": "launch",
+      "program": "demo_toolbox.py",
+      "console": "integratedTerminal",
+      "args": ["-d","..\\audiodata","-vc"]
+    },
     {
       "name": "Python: Synth Train",
       "type": "python",
@@ -43,5 +51,15 @@
       "console": "integratedTerminal",
       "args": ["my_run", "..\\"]
     },
+    {
+      "name": "Python: PPG Convert",
+      "type": "python",
+      "request": "launch",
+      "program": "run.py",
+      "console": "integratedTerminal",
+      "args": ["-c", ".\\ppg2mel\\saved_models\\seq2seq_mol_ppg2mel_vctk_libri_oneshotvc_r4_normMel_v2.yaml",
+        "-m", ".\\ppg2mel\\saved_models\\best_loss_step_304000.pth", "--wav_dir", ".\\wavs\\input", "--ref_wav_path", ".\\wavs\\pkq.mp3", "-o", ".\\wavs\\output\\"
+      ]
+    },
   ]
 }

demo_toolbox.py

@@ -15,12 +15,18 @@ if __name__ == '__main__':
     parser.add_argument("-d", "--datasets_root", type=Path, help= \
         "Path to the directory containing your datasets. See toolbox/__init__.py for a list of "
         "supported datasets.", default=None)
+    parser.add_argument("-vc", "--vc_mode", action="store_true", 
+                        help="Voice Conversion Mode(PPG based)")
     parser.add_argument("-e", "--enc_models_dir", type=Path, default="encoder/saved_models", 
                         help="Directory containing saved encoder models")
     parser.add_argument("-s", "--syn_models_dir", type=Path, default="synthesizer/saved_models", 
                         help="Directory containing saved synthesizer models")
     parser.add_argument("-v", "--voc_models_dir", type=Path, default="vocoder/saved_models", 
                         help="Directory containing saved vocoder models")
+    parser.add_argument("-ex", "--extractor_models_dir", type=Path, default="ppg_extractor/saved_models", 
+                        help="Directory containing saved extrator models")
+    parser.add_argument("-cv", "--convertor_models_dir", type=Path, default="ppg2mel/saved_models", 
+                        help="Directory containing saved convert models")
     parser.add_argument("--cpu", action="store_true", help=\
         "If True, processing is done on CPU, even when a GPU is available.")
     parser.add_argument("--seed", type=int, default=None, help=\

encoder/inference.py

@@ -34,7 +34,15 @@ def load_model(weights_fpath: Path, device=None):
     _model.load_state_dict(checkpoint["model_state"])
     _model.eval()
     print("Loaded encoder \"%s\" trained to step %d" % (weights_fpath.name, checkpoint["step"]))
+    return _model
     
+def set_model(model, device=None):
+    global _model, _device
+    _model = model
+    if device is None:
+        _device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+    _device = device
+    _model.to(device)
 
 def is_loaded():
     return _model is not None
@@ -57,7 +65,7 @@ def embed_frames_batch(frames_batch):
 
 
 def compute_partial_slices(n_samples, partial_utterance_n_frames=partials_n_frames,
-                           min_pad_coverage=0.75, overlap=0.5):
+                           min_pad_coverage=0.75, overlap=0.5, rate=None):
     """
     Computes where to split an utterance waveform and its corresponding mel spectrogram to obtain 
     partial utterances of <partial_utterance_n_frames> each. Both the waveform and the mel 
@@ -85,10 +93,19 @@ def compute_partial_slices(n_samples, partial_utterance_n_frames=partials_n_fram
     assert 0 <= overlap < 1
     assert 0 < min_pad_coverage <= 1
     
+    if rate != None:
+        samples_per_frame = int((sampling_rate * mel_window_step / 1000))
+        n_frames = int(np.ceil((n_samples + 1) / samples_per_frame))
+        frame_step = int(np.round((sampling_rate / rate) / samples_per_frame))
+    else: 
         samples_per_frame = int((sampling_rate * mel_window_step / 1000))
         n_frames = int(np.ceil((n_samples + 1) / samples_per_frame))
         frame_step = max(int(np.round(partial_utterance_n_frames * (1 - overlap))), 1)
 
+    assert 0 < frame_step, "The rate is too high"
+    assert frame_step <= partials_n_frames, "The rate is too low, it should be %f at least" % \
+        (sampling_rate / (samples_per_frame * partials_n_frames))
+
     # Compute the slices
     wav_slices, mel_slices = [], []
     steps = max(1, n_frames - partial_utterance_n_frames + frame_step + 1)

ppg2mel/__init__.py

@@ -0,0 +1,206 @@
+#!/usr/bin/env python3
+
+# Copyright 2020 Songxiang Liu
+# Apache 2.0
+
+from typing import List
+
+import torch
+import torch.nn.functional as F
+
+import numpy as np
+
+from .utils.abs_model import AbsMelDecoder
+from .rnn_decoder_mol import Decoder
+from .utils.cnn_postnet import Postnet
+from .utils.vc_utils import get_mask_from_lengths
+
+from utils.load_yaml import HpsYaml
+
+class MelDecoderMOLv2(AbsMelDecoder):
+    """Use an encoder to preprocess ppg."""
+    def __init__(
+        self,
+        num_speakers: int,
+        spk_embed_dim: int,
+        bottle_neck_feature_dim: int,
+        encoder_dim: int = 256,
+        encoder_downsample_rates: List = [2, 2],
+        attention_rnn_dim: int = 512,
+        decoder_rnn_dim: int = 512,
+        num_decoder_rnn_layer: int = 1,
+        concat_context_to_last: bool = True,
+        prenet_dims: List = [256, 128],
+        num_mixtures: int = 5,
+        frames_per_step: int = 2,
+        mask_padding: bool = True,
+    ):
+        super().__init__()
+        
+        self.mask_padding = mask_padding
+        self.bottle_neck_feature_dim = bottle_neck_feature_dim
+        self.num_mels = 80
+        self.encoder_down_factor=np.cumprod(encoder_downsample_rates)[-1]
+        self.frames_per_step = frames_per_step
+        self.use_spk_dvec = True
+
+        input_dim = bottle_neck_feature_dim
+        
+        # Downsampling convolution
+        self.bnf_prenet = torch.nn.Sequential(
+            torch.nn.Conv1d(input_dim, encoder_dim, kernel_size=1, bias=False),
+            torch.nn.LeakyReLU(0.1),
+
+            torch.nn.InstanceNorm1d(encoder_dim, affine=False),
+            torch.nn.Conv1d(
+                encoder_dim, encoder_dim, 
+                kernel_size=2*encoder_downsample_rates[0], 
+                stride=encoder_downsample_rates[0], 
+                padding=encoder_downsample_rates[0]//2,
+            ),
+            torch.nn.LeakyReLU(0.1),
+            
+            torch.nn.InstanceNorm1d(encoder_dim, affine=False),
+            torch.nn.Conv1d(
+                encoder_dim, encoder_dim, 
+                kernel_size=2*encoder_downsample_rates[1], 
+                stride=encoder_downsample_rates[1], 
+                padding=encoder_downsample_rates[1]//2,
+            ),
+            torch.nn.LeakyReLU(0.1),
+
+            torch.nn.InstanceNorm1d(encoder_dim, affine=False),
+        )
+        decoder_enc_dim = encoder_dim
+        self.pitch_convs = torch.nn.Sequential(
+            torch.nn.Conv1d(2, encoder_dim, kernel_size=1, bias=False),
+            torch.nn.LeakyReLU(0.1),
+
+            torch.nn.InstanceNorm1d(encoder_dim, affine=False),
+            torch.nn.Conv1d(
+                encoder_dim, encoder_dim, 
+                kernel_size=2*encoder_downsample_rates[0], 
+                stride=encoder_downsample_rates[0], 
+                padding=encoder_downsample_rates[0]//2,
+            ),
+            torch.nn.LeakyReLU(0.1),
+            
+            torch.nn.InstanceNorm1d(encoder_dim, affine=False),
+            torch.nn.Conv1d(
+                encoder_dim, encoder_dim, 
+                kernel_size=2*encoder_downsample_rates[1], 
+                stride=encoder_downsample_rates[1], 
+                padding=encoder_downsample_rates[1]//2,
+            ),
+            torch.nn.LeakyReLU(0.1),
+
+            torch.nn.InstanceNorm1d(encoder_dim, affine=False),
+        )
+        
+        self.reduce_proj = torch.nn.Linear(encoder_dim + spk_embed_dim, encoder_dim)
+
+        # Decoder
+        self.decoder = Decoder(
+            enc_dim=decoder_enc_dim,
+            num_mels=self.num_mels,
+            frames_per_step=frames_per_step,
+            attention_rnn_dim=attention_rnn_dim,
+            decoder_rnn_dim=decoder_rnn_dim,
+            num_decoder_rnn_layer=num_decoder_rnn_layer,
+            prenet_dims=prenet_dims,
+            num_mixtures=num_mixtures,
+            use_stop_tokens=True,
+            concat_context_to_last=concat_context_to_last,
+            encoder_down_factor=self.encoder_down_factor,
+        )
+
+        # Mel-Spec Postnet: some residual CNN layers
+        self.postnet = Postnet()
+    
+    def parse_output(self, outputs, output_lengths=None):
+        if self.mask_padding and output_lengths is not None:
+            mask = ~get_mask_from_lengths(output_lengths, outputs[0].size(1))
+            mask = mask.unsqueeze(2).expand(mask.size(0), mask.size(1), self.num_mels)
+            outputs[0].data.masked_fill_(mask, 0.0)
+            outputs[1].data.masked_fill_(mask, 0.0)
+        return outputs
+
+    def forward(
+        self,
+        bottle_neck_features: torch.Tensor,
+        feature_lengths: torch.Tensor,
+        speech: torch.Tensor,
+        speech_lengths: torch.Tensor,
+        logf0_uv: torch.Tensor = None,
+        spembs: torch.Tensor = None,
+        output_att_ws: bool = False,
+    ):
+        decoder_inputs = self.bnf_prenet(
+            bottle_neck_features.transpose(1, 2)
+        ).transpose(1, 2)
+        logf0_uv = self.pitch_convs(logf0_uv.transpose(1, 2)).transpose(1, 2)
+        decoder_inputs = decoder_inputs + logf0_uv
+            
+        assert spembs is not None
+        spk_embeds = F.normalize(
+            spembs).unsqueeze(1).expand(-1, decoder_inputs.size(1), -1)
+        decoder_inputs = torch.cat([decoder_inputs, spk_embeds], dim=-1)
+        decoder_inputs = self.reduce_proj(decoder_inputs)
+        
+        # (B, num_mels, T_dec)
+        T_dec = torch.div(feature_lengths, int(self.encoder_down_factor), rounding_mode='floor')
+        mel_outputs, predicted_stop, alignments = self.decoder(
+            decoder_inputs, speech, T_dec)
+        ## Post-processing
+        mel_outputs_postnet = self.postnet(mel_outputs.transpose(1, 2)).transpose(1, 2)
+        mel_outputs_postnet = mel_outputs + mel_outputs_postnet
+        if output_att_ws: 
+            return self.parse_output(
+                [mel_outputs, mel_outputs_postnet, predicted_stop, alignments], speech_lengths)
+        else:
+            return self.parse_output(
+                [mel_outputs, mel_outputs_postnet, predicted_stop], speech_lengths)
+
+        # return mel_outputs, mel_outputs_postnet
+
+    def inference(
+        self,
+        bottle_neck_features: torch.Tensor,
+        logf0_uv: torch.Tensor = None,
+        spembs: torch.Tensor = None,
+    ):
+        decoder_inputs = self.bnf_prenet(bottle_neck_features.transpose(1, 2)).transpose(1, 2)
+        logf0_uv = self.pitch_convs(logf0_uv.transpose(1, 2)).transpose(1, 2)
+        decoder_inputs = decoder_inputs + logf0_uv
+
+        assert spembs is not None
+        spk_embeds = F.normalize(
+            spembs).unsqueeze(1).expand(-1, decoder_inputs.size(1), -1)
+        bottle_neck_features = torch.cat([decoder_inputs, spk_embeds], dim=-1)
+        bottle_neck_features = self.reduce_proj(bottle_neck_features)
+
+        ## Decoder
+        if bottle_neck_features.size(0) > 1:
+            mel_outputs, alignments = self.decoder.inference_batched(bottle_neck_features)
+        else:
+            mel_outputs, alignments = self.decoder.inference(bottle_neck_features,)
+        ## Post-processing
+        mel_outputs_postnet = self.postnet(mel_outputs.transpose(1, 2)).transpose(1, 2)
+        mel_outputs_postnet = mel_outputs + mel_outputs_postnet
+        # outputs = mel_outputs_postnet[0]
+        
+        return mel_outputs[0], mel_outputs_postnet[0], alignments[0]
+
+def load_model(train_config, model_file, device=None):
+    
+    if device is None:
+        device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+
+    model_config = HpsYaml(train_config)
+    ppg2mel_model = MelDecoderMOLv2(
+        **model_config["model"]
+    ).to(device)
+    ckpt = torch.load(model_file, map_location=device)
+    ppg2mel_model.load_state_dict(ckpt["model"])
+    ppg2mel_model.eval()
+    return ppg2mel_model

ppg2mel/preprocess.py

@@ -0,0 +1,112 @@
+
+import os
+import torch
+import numpy as np
+from tqdm import tqdm
+from pathlib import Path
+import soundfile
+import resampy
+
+from ppg_extractor import load_model
+import encoder.inference as Encoder
+from encoder.audio import preprocess_wav
+from encoder import audio
+from utils.f0_utils import compute_f0
+
+from torch.multiprocessing import Pool, cpu_count
+from functools import partial
+
+SAMPLE_RATE=16000
+
+def _compute_bnf(
+    wav: any,
+    output_fpath: str,
+    device: torch.device,
+    ppg_model_local: any,
+):
+    """
+    Compute CTC-Attention Seq2seq ASR encoder bottle-neck features (BNF).
+    """
+    ppg_model_local.to(device)
+    wav_tensor = torch.from_numpy(wav).float().to(device).unsqueeze(0)
+    wav_length = torch.LongTensor([wav.shape[0]]).to(device)
+    with torch.no_grad():
+        bnf = ppg_model_local(wav_tensor, wav_length) 
+    bnf_npy = bnf.squeeze(0).cpu().numpy()
+    np.save(output_fpath, bnf_npy, allow_pickle=False)
+    return bnf_npy, len(bnf_npy)
+
+def _compute_f0_from_wav(wav, output_fpath):
+    """Compute merged f0 values."""
+    f0 = compute_f0(wav, SAMPLE_RATE)
+    np.save(output_fpath, f0, allow_pickle=False)
+    return f0, len(f0)
+
+def _compute_spkEmbed(wav, output_fpath, encoder_model_local, device):
+    Encoder.set_model(encoder_model_local)
+    # Compute where to split the utterance into partials and pad if necessary
+    wave_slices, mel_slices = Encoder.compute_partial_slices(len(wav), rate=1.3, min_pad_coverage=0.75)
+    max_wave_length = wave_slices[-1].stop
+    if max_wave_length >= len(wav):
+        wav = np.pad(wav, (0, max_wave_length - len(wav)), "constant")
+    
+    # Split the utterance into partials
+    frames = audio.wav_to_mel_spectrogram(wav)
+    frames_batch = np.array([frames[s] for s in mel_slices])
+    partial_embeds = Encoder.embed_frames_batch(frames_batch)
+    
+    # Compute the utterance embedding from the partial embeddings
+    raw_embed = np.mean(partial_embeds, axis=0)
+    embed = raw_embed / np.linalg.norm(raw_embed, 2)
+
+    np.save(output_fpath, embed, allow_pickle=False)
+    return embed, len(embed)
+
+def preprocess_one(wav_path, out_dir, device, ppg_model_local, encoder_model_local):
+    # wav = preprocess_wav(wav_path)
+    # try:
+    wav, sr = soundfile.read(wav_path)
+    if len(wav) < sr:
+        return None, sr, len(wav)
+    if sr != SAMPLE_RATE:
+        wav = resampy.resample(wav, sr, SAMPLE_RATE)
+        sr = SAMPLE_RATE
+    utt_id = os.path.basename(wav_path).rstrip(".wav")
+
+    _, length_bnf = _compute_bnf(output_fpath=f"{out_dir}/bnf/{utt_id}.ling_feat.npy", wav=wav, device=device, ppg_model_local=ppg_model_local)
+    _, length_f0 = _compute_f0_from_wav(output_fpath=f"{out_dir}/f0/{utt_id}.f0.npy", wav=wav)
+    _, length_embed = _compute_spkEmbed(output_fpath=f"{out_dir}/embed/{utt_id}.npy",  device=device, encoder_model_local=encoder_model_local, wav=wav)
+
+def preprocess_dataset(datasets_root, dataset, out_dir, n_processes, ppg_encoder_model_fpath, speaker_encoder_model):
+    # Glob wav files
+    wav_file_list = sorted(Path(f"{datasets_root}/{dataset}").glob("**/*.wav"))
+    print(f"Globbed {len(wav_file_list)} wav files.")
+
+    out_dir.joinpath("bnf").mkdir(exist_ok=True, parents=True)
+    out_dir.joinpath("f0").mkdir(exist_ok=True, parents=True)
+    out_dir.joinpath("embed").mkdir(exist_ok=True, parents=True)
+    ppg_model_local = load_model(ppg_encoder_model_fpath, "cpu")
+    encoder_model_local = Encoder.load_model(speaker_encoder_model, "cpu")
+    if n_processes is None:
+        n_processes = cpu_count()
+    
+    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+    func = partial(preprocess_one, out_dir=out_dir, ppg_model_local=ppg_model_local, encoder_model_local=encoder_model_local, device=device)
+    job = Pool(n_processes).imap(func, wav_file_list)
+    list(tqdm(job, "Preprocessing", len(wav_file_list), unit="wav"))
+
+    # finish processing and mark
+    t_fid_file = out_dir.joinpath("train_fidlist.txt").open("w", encoding="utf-8")
+    d_fid_file = out_dir.joinpath("dev_fidlist.txt").open("w", encoding="utf-8")
+    e_fid_file = out_dir.joinpath("eval_fidlist.txt").open("w", encoding="utf-8")
+    for file in sorted(out_dir.joinpath("f0").glob("*.npy")):
+        id = os.path.basename(file).split(".f0.npy")[0]
+        if id.endswith("01"):
+            d_fid_file.write(id + "\n")
+        elif id.endswith("09"):
+            e_fid_file.write(id + "\n")
+        else:
+            t_fid_file.write(id + "\n")
+    t_fid_file.close()
+    d_fid_file.close()
+    e_fid_file.close()

ppg2mel/rnn_decoder_mol.py

@@ -0,0 +1,374 @@
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+import numpy as np
+from .utils.mol_attention import MOLAttention
+from .utils.basic_layers import Linear
+from .utils.vc_utils import get_mask_from_lengths
+
+
+class DecoderPrenet(nn.Module):
+    def __init__(self, in_dim, sizes):
+        super().__init__()
+        in_sizes = [in_dim] + sizes[:-1]
+        self.layers = nn.ModuleList(
+            [Linear(in_size, out_size, bias=False)
+             for (in_size, out_size) in zip(in_sizes, sizes)])
+
+    def forward(self, x):
+        for linear in self.layers:
+            x = F.dropout(F.relu(linear(x)), p=0.5, training=True)
+        return x
+
+
+class Decoder(nn.Module):
+    """Mixture of Logistic (MoL) attention-based RNN Decoder."""
+    def __init__(
+        self,
+        enc_dim,
+        num_mels,
+        frames_per_step,
+        attention_rnn_dim,
+        decoder_rnn_dim,
+        prenet_dims,
+        num_mixtures,
+        encoder_down_factor=1,
+        num_decoder_rnn_layer=1,
+        use_stop_tokens=False,
+        concat_context_to_last=False,
+    ):
+        super().__init__()
+        self.enc_dim = enc_dim
+        self.encoder_down_factor = encoder_down_factor
+        self.num_mels = num_mels
+        self.frames_per_step = frames_per_step
+        self.attention_rnn_dim = attention_rnn_dim
+        self.decoder_rnn_dim = decoder_rnn_dim
+        self.prenet_dims = prenet_dims
+        self.use_stop_tokens = use_stop_tokens
+        self.num_decoder_rnn_layer = num_decoder_rnn_layer
+        self.concat_context_to_last = concat_context_to_last
+
+        # Mel prenet
+        self.prenet = DecoderPrenet(num_mels, prenet_dims)
+        self.prenet_pitch = DecoderPrenet(num_mels, prenet_dims)
+
+        # Attention RNN
+        self.attention_rnn = nn.LSTMCell(
+            prenet_dims[-1] + enc_dim,
+            attention_rnn_dim
+        )
+        
+        # Attention
+        self.attention_layer = MOLAttention(
+            attention_rnn_dim,
+            r=frames_per_step/encoder_down_factor,
+            M=num_mixtures,
+        )
+
+        # Decoder RNN
+        self.decoder_rnn_layers = nn.ModuleList()
+        for i in range(num_decoder_rnn_layer):
+            if i == 0:
+                self.decoder_rnn_layers.append(
+                    nn.LSTMCell(
+                        enc_dim + attention_rnn_dim,
+                        decoder_rnn_dim))
+            else:
+                self.decoder_rnn_layers.append(
+                    nn.LSTMCell(
+                        decoder_rnn_dim,
+                        decoder_rnn_dim))
+        # self.decoder_rnn = nn.LSTMCell(
+            # 2 * enc_dim + attention_rnn_dim,
+            # decoder_rnn_dim
+        # )
+        if concat_context_to_last:
+            self.linear_projection = Linear(
+                enc_dim + decoder_rnn_dim,
+                num_mels * frames_per_step
+            )
+        else:
+            self.linear_projection = Linear(
+                decoder_rnn_dim,
+                num_mels * frames_per_step
+            )
+
+
+        # Stop-token layer
+        if self.use_stop_tokens:
+            if concat_context_to_last:
+                self.stop_layer = Linear(
+                    enc_dim + decoder_rnn_dim, 1, bias=True, w_init_gain="sigmoid"
+                )
+            else:
+                self.stop_layer = Linear(
+                    decoder_rnn_dim, 1, bias=True, w_init_gain="sigmoid"
+                )
+                
+
+    def get_go_frame(self, memory):
+        B = memory.size(0)
+        go_frame = torch.zeros((B, self.num_mels), dtype=torch.float,
+                               device=memory.device)
+        return go_frame
+
+    def initialize_decoder_states(self, memory, mask):
+        device = next(self.parameters()).device
+        B = memory.size(0)
+        
+        # attention rnn states
+        self.attention_hidden = torch.zeros(
+            (B, self.attention_rnn_dim), device=device)
+        self.attention_cell = torch.zeros(
+            (B, self.attention_rnn_dim), device=device)
+
+        # decoder rnn states
+        self.decoder_hiddens = []
+        self.decoder_cells = []
+        for i in range(self.num_decoder_rnn_layer):
+            self.decoder_hiddens.append(
+                torch.zeros((B, self.decoder_rnn_dim),
+                            device=device)
+            )
+            self.decoder_cells.append(
+                torch.zeros((B, self.decoder_rnn_dim),
+                            device=device)
+            )
+        # self.decoder_hidden = torch.zeros(
+            # (B, self.decoder_rnn_dim), device=device)
+        # self.decoder_cell = torch.zeros(
+            # (B, self.decoder_rnn_dim), device=device)
+        
+        self.attention_context =  torch.zeros(
+            (B, self.enc_dim), device=device)
+
+        self.memory = memory
+        # self.processed_memory = self.attention_layer.memory_layer(memory)
+        self.mask = mask
+
+    def parse_decoder_inputs(self, decoder_inputs):
+        """Prepare decoder inputs, i.e. gt mel
+        Args:
+            decoder_inputs:(B, T_out, n_mel_channels) inputs used for teacher-forced training.
+        """
+        decoder_inputs = decoder_inputs.reshape(
+            decoder_inputs.size(0),
+            int(decoder_inputs.size(1)/self.frames_per_step), -1)
+        # (B, T_out//r, r*num_mels) -> (T_out//r, B, r*num_mels)
+        decoder_inputs = decoder_inputs.transpose(0, 1)
+        # (T_out//r, B, num_mels)
+        decoder_inputs = decoder_inputs[:,:,-self.num_mels:]
+        return decoder_inputs
+        
+    def parse_decoder_outputs(self, mel_outputs, alignments, stop_outputs):
+        """ Prepares decoder outputs for output
+        Args:
+            mel_outputs:
+            alignments:
+        """
+        # (T_out//r, B, T_enc) -> (B, T_out//r, T_enc)
+        alignments = torch.stack(alignments).transpose(0, 1)
+        # (T_out//r, B) -> (B, T_out//r)
+        if stop_outputs is not None:
+            if alignments.size(0) == 1:
+                stop_outputs = torch.stack(stop_outputs).unsqueeze(0)
+            else:
+                stop_outputs = torch.stack(stop_outputs).transpose(0, 1)
+            stop_outputs = stop_outputs.contiguous()
+        # (T_out//r, B, num_mels*r) -> (B, T_out//r, num_mels*r)
+        mel_outputs = torch.stack(mel_outputs).transpose(0, 1).contiguous()
+        # decouple frames per step
+        # (B, T_out, num_mels)
+        mel_outputs = mel_outputs.view(
+            mel_outputs.size(0), -1, self.num_mels)
+        return mel_outputs, alignments, stop_outputs     
+    
+    def attend(self, decoder_input):
+        cell_input = torch.cat((decoder_input, self.attention_context), -1)
+        self.attention_hidden, self.attention_cell = self.attention_rnn(
+            cell_input, (self.attention_hidden, self.attention_cell))
+        self.attention_context, attention_weights = self.attention_layer(
+            self.attention_hidden, self.memory, None, self.mask)
+        
+        decoder_rnn_input = torch.cat(
+            (self.attention_hidden, self.attention_context), -1)
+
+        return decoder_rnn_input, self.attention_context, attention_weights
+
+    def decode(self, decoder_input):
+        for i in range(self.num_decoder_rnn_layer):
+            if i == 0:
+                self.decoder_hiddens[i], self.decoder_cells[i] = self.decoder_rnn_layers[i](
+                    decoder_input, (self.decoder_hiddens[i], self.decoder_cells[i]))
+            else:
+                self.decoder_hiddens[i], self.decoder_cells[i] = self.decoder_rnn_layers[i](
+                    self.decoder_hiddens[i-1], (self.decoder_hiddens[i], self.decoder_cells[i]))
+        return self.decoder_hiddens[-1]
+    
+    def forward(self, memory, mel_inputs, memory_lengths):
+        """ Decoder forward pass for training
+        Args:
+            memory: (B, T_enc, enc_dim) Encoder outputs
+            decoder_inputs: (B, T, num_mels) Decoder inputs for teacher forcing.
+            memory_lengths: (B, ) Encoder output lengths for attention masking.
+        Returns:
+            mel_outputs: (B, T, num_mels) mel outputs from the decoder
+            alignments: (B, T//r, T_enc) attention weights.
+        """
+        # [1, B, num_mels]
+        go_frame = self.get_go_frame(memory).unsqueeze(0)
+        # [T//r, B, num_mels]
+        mel_inputs = self.parse_decoder_inputs(mel_inputs)
+        # [T//r + 1, B, num_mels]
+        mel_inputs = torch.cat((go_frame, mel_inputs), dim=0)
+        # [T//r + 1, B, prenet_dim]
+        decoder_inputs = self.prenet(mel_inputs) 
+        # decoder_inputs_pitch = self.prenet_pitch(decoder_inputs__)
+
+        self.initialize_decoder_states(
+            memory, mask=~get_mask_from_lengths(memory_lengths),
+        )
+        
+        self.attention_layer.init_states(memory)
+        # self.attention_layer_pitch.init_states(memory_pitch)
+
+        mel_outputs, alignments = [], []
+        if self.use_stop_tokens:
+            stop_outputs = []
+        else:
+            stop_outputs = None
+        while len(mel_outputs) < decoder_inputs.size(0) - 1:
+            decoder_input = decoder_inputs[len(mel_outputs)]
+            # decoder_input_pitch = decoder_inputs_pitch[len(mel_outputs)]
+
+            decoder_rnn_input, context, attention_weights = self.attend(decoder_input)
+
+            decoder_rnn_output = self.decode(decoder_rnn_input)
+            if self.concat_context_to_last:    
+                decoder_rnn_output = torch.cat(
+                    (decoder_rnn_output, context), dim=1)
+                   
+            mel_output = self.linear_projection(decoder_rnn_output)
+            if self.use_stop_tokens:
+                stop_output = self.stop_layer(decoder_rnn_output)
+                stop_outputs += [stop_output.squeeze()]
+            mel_outputs += [mel_output.squeeze(1)] #? perhaps don't need squeeze
+            alignments += [attention_weights]
+            # alignments_pitch += [attention_weights_pitch]   
+
+        mel_outputs, alignments, stop_outputs = self.parse_decoder_outputs(
+            mel_outputs, alignments, stop_outputs)
+        if stop_outputs is None:
+            return mel_outputs, alignments
+        else:
+            return mel_outputs, stop_outputs, alignments
+
+    def inference(self, memory, stop_threshold=0.5):
+        """ Decoder inference
+        Args:
+            memory: (1, T_enc, D_enc) Encoder outputs
+        Returns:
+            mel_outputs: mel outputs from the decoder
+            alignments: sequence of attention weights from the decoder
+        """
+        # [1, num_mels]
+        decoder_input = self.get_go_frame(memory)
+
+        self.initialize_decoder_states(memory, mask=None)
+
+        self.attention_layer.init_states(memory)
+        
+        mel_outputs, alignments = [], []
+        # NOTE(sx): heuristic 
+        max_decoder_step = memory.size(1)*self.encoder_down_factor//self.frames_per_step 
+        min_decoder_step = memory.size(1)*self.encoder_down_factor // self.frames_per_step - 5
+        while True:
+            decoder_input = self.prenet(decoder_input)
+
+            decoder_input_final, context, alignment = self.attend(decoder_input)
+
+            #mel_output, stop_output, alignment = self.decode(decoder_input)
+            decoder_rnn_output = self.decode(decoder_input_final)
+            if self.concat_context_to_last:    
+                decoder_rnn_output = torch.cat(
+                    (decoder_rnn_output, context), dim=1)
+            
+            mel_output = self.linear_projection(decoder_rnn_output)
+            stop_output = self.stop_layer(decoder_rnn_output)
+            
+            mel_outputs += [mel_output.squeeze(1)]
+            alignments += [alignment]
+            
+            if torch.sigmoid(stop_output.data) > stop_threshold and len(mel_outputs) >= min_decoder_step:
+                break
+            if len(mel_outputs) >= max_decoder_step:
+                # print("Warning! Decoding steps reaches max decoder steps.")
+                break
+
+            decoder_input = mel_output[:,-self.num_mels:]
+
+
+        mel_outputs, alignments, _  = self.parse_decoder_outputs(
+            mel_outputs, alignments, None)
+
+        return mel_outputs, alignments
+
+    def inference_batched(self, memory, stop_threshold=0.5):
+        """ Decoder inference
+        Args:
+            memory: (B, T_enc, D_enc) Encoder outputs
+        Returns:
+            mel_outputs: mel outputs from the decoder
+            alignments: sequence of attention weights from the decoder
+        """
+        # [1, num_mels]
+        decoder_input = self.get_go_frame(memory)
+
+        self.initialize_decoder_states(memory, mask=None)
+
+        self.attention_layer.init_states(memory)
+        
+        mel_outputs, alignments = [], []
+        stop_outputs = []
+        # NOTE(sx): heuristic 
+        max_decoder_step = memory.size(1)*self.encoder_down_factor//self.frames_per_step 
+        min_decoder_step = memory.size(1)*self.encoder_down_factor // self.frames_per_step - 5
+        while True:
+            decoder_input = self.prenet(decoder_input)
+
+            decoder_input_final, context, alignment = self.attend(decoder_input)
+
+            #mel_output, stop_output, alignment = self.decode(decoder_input)
+            decoder_rnn_output = self.decode(decoder_input_final)
+            if self.concat_context_to_last:    
+                decoder_rnn_output = torch.cat(
+                    (decoder_rnn_output, context), dim=1)
+            
+            mel_output = self.linear_projection(decoder_rnn_output)
+            # (B, 1)
+            stop_output = self.stop_layer(decoder_rnn_output)
+            stop_outputs += [stop_output.squeeze()]
+            # stop_outputs.append(stop_output) 
+
+            mel_outputs += [mel_output.squeeze(1)]
+            alignments += [alignment]
+            # print(stop_output.shape)
+            if torch.all(torch.sigmoid(stop_output.squeeze().data) > stop_threshold) \
+                    and len(mel_outputs) >= min_decoder_step:
+                break
+            if len(mel_outputs) >= max_decoder_step:
+                # print("Warning! Decoding steps reaches max decoder steps.")
+                break
+
+            decoder_input = mel_output[:,-self.num_mels:]
+
+
+        mel_outputs, alignments, stop_outputs = self.parse_decoder_outputs(
+            mel_outputs, alignments, stop_outputs)
+        mel_outputs_stacked = []
+        for mel, stop_logit in zip(mel_outputs, stop_outputs):
+            idx = np.argwhere(torch.sigmoid(stop_logit.cpu()) > stop_threshold)[0][0].item()
+            mel_outputs_stacked.append(mel[:idx,:])
+        mel_outputs = torch.cat(mel_outputs_stacked, dim=0).unsqueeze(0)
+        return mel_outputs, alignments

ppg2mel/train.py

@@ -0,0 +1,67 @@
+import sys
+import torch
+import argparse
+import numpy as np
+from utils.load_yaml import HpsYaml
+from ppg2mel.train.train_linglf02mel_seq2seq_oneshotvc import Solver
+
+# For reproducibility, comment these may speed up training
+torch.backends.cudnn.deterministic = True
+torch.backends.cudnn.benchmark = False
+
+def main():
+    # Arguments
+    parser = argparse.ArgumentParser(description=
+            'Training PPG2Mel VC model.')
+    parser.add_argument('--config', type=str, 
+                        help='Path to experiment config, e.g., config/vc.yaml')
+    parser.add_argument('--name', default=None, type=str, help='Name for logging.')
+    parser.add_argument('--logdir', default='log/', type=str,
+                        help='Logging path.', required=False)
+    parser.add_argument('--ckpdir', default='ckpt/', type=str,
+                        help='Checkpoint path.', required=False)
+    parser.add_argument('--outdir', default='result/', type=str,
+                        help='Decode output path.', required=False)
+    parser.add_argument('--load', default=None, type=str,
+                        help='Load pre-trained model (for training only)', required=False)
+    parser.add_argument('--warm_start', action='store_true',
+                        help='Load model weights only, ignore specified layers.')
+    parser.add_argument('--seed', default=0, type=int,
+                        help='Random seed for reproducable results.', required=False)
+    parser.add_argument('--njobs', default=8, type=int,
+                        help='Number of threads for dataloader/decoding.', required=False)
+    parser.add_argument('--cpu', action='store_true', help='Disable GPU training.')
+    parser.add_argument('--no-pin', action='store_true',
+                        help='Disable pin-memory for dataloader')
+    parser.add_argument('--test', action='store_true', help='Test the model.')
+    parser.add_argument('--no-msg', action='store_true', help='Hide all messages.')
+    parser.add_argument('--finetune', action='store_true', help='Finetune model')
+    parser.add_argument('--oneshotvc', action='store_true', help='Oneshot VC model')
+    parser.add_argument('--bilstm', action='store_true', help='BiLSTM VC model')
+    parser.add_argument('--lsa', action='store_true', help='Use location-sensitive attention (LSA)')
+
+    ###
+
+    paras = parser.parse_args()
+    setattr(paras, 'gpu', not paras.cpu)
+    setattr(paras, 'pin_memory', not paras.no_pin)
+    setattr(paras, 'verbose', not paras.no_msg)
+    # Make the config dict dot visitable
+    config = HpsYaml(paras.config)
+
+    np.random.seed(paras.seed)
+    torch.manual_seed(paras.seed)
+    if torch.cuda.is_available():
+        torch.cuda.manual_seed_all(paras.seed)
+
+    print(">>> OneShot VC training ...")
+    mode = "train"
+    solver = Solver(config, paras, mode)
+    solver.load_data()
+    solver.set_model()
+    solver.exec()
+    print(">>> Oneshot VC train finished!")
+    sys.exit(0)
+
+if __name__ == "__main__":
+    main()   

ppg2mel/train/__init__.py

@@ -0,0 +1 @@
+#

ppg2mel/train/loss.py

@@ -0,0 +1,50 @@
+from typing import Dict
+from typing import Tuple
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+from ..utils.nets_utils import make_pad_mask
+
+
+class MaskedMSELoss(nn.Module):
+    def __init__(self, frames_per_step):
+        super().__init__()
+        self.frames_per_step = frames_per_step
+        self.mel_loss_criterion = nn.MSELoss(reduction='none')
+        # self.loss = nn.MSELoss()
+        self.stop_loss_criterion = nn.BCEWithLogitsLoss(reduction='none')   
+
+    def get_mask(self, lengths, max_len=None):
+        # lengths: [B,]
+        if max_len is None:
+            max_len = torch.max(lengths)
+        batch_size = lengths.size(0)
+        seq_range = torch.arange(0, max_len).long()
+        seq_range_expand = seq_range.unsqueeze(0).expand(batch_size, max_len).to(lengths.device)
+        seq_length_expand = lengths.unsqueeze(1).expand_as(seq_range_expand)
+        return (seq_range_expand < seq_length_expand).float()
+
+    def forward(self, mel_pred, mel_pred_postnet, mel_trg, lengths, 
+                stop_target, stop_pred):
+        ## process stop_target
+        B = stop_target.size(0)
+        stop_target = stop_target.reshape(B, -1, self.frames_per_step)[:, :, 0]
+        stop_lengths = torch.ceil(lengths.float() / self.frames_per_step).long()
+        stop_mask = self.get_mask(stop_lengths, int(mel_trg.size(1)/self.frames_per_step))
+
+        mel_trg.requires_grad = False
+        # (B, T, 1)
+        mel_mask = self.get_mask(lengths, mel_trg.size(1)).unsqueeze(-1)
+        # (B, T, D)
+        mel_mask = mel_mask.expand_as(mel_trg)
+        mel_loss_pre = (self.mel_loss_criterion(mel_pred, mel_trg) * mel_mask).sum() / mel_mask.sum()
+        mel_loss_post = (self.mel_loss_criterion(mel_pred_postnet, mel_trg) * mel_mask).sum() / mel_mask.sum()
+        
+        mel_loss = mel_loss_pre + mel_loss_post
+
+        # stop token loss
+        stop_loss = torch.sum(self.stop_loss_criterion(stop_pred, stop_target) * stop_mask) / stop_mask.sum()
+        
+        return mel_loss, stop_loss

ppg2mel/train/optim.py

@@ -0,0 +1,45 @@
+import torch
+import numpy as np
+
+
+class Optimizer():
+    def __init__(self, parameters, optimizer, lr, eps, lr_scheduler, 
+                **kwargs):
+
+        # Setup torch optimizer
+        self.opt_type = optimizer
+        self.init_lr = lr
+        self.sch_type = lr_scheduler
+        opt = getattr(torch.optim, optimizer)
+        if lr_scheduler == 'warmup':
+            warmup_step = 4000.0
+            init_lr = lr
+            self.lr_scheduler = lambda step: init_lr * warmup_step ** 0.5 * \
+                np.minimum((step+1)*warmup_step**-1.5, (step+1)**-0.5)
+            self.opt = opt(parameters, lr=1.0)
+        else:
+            self.lr_scheduler = None
+            self.opt = opt(parameters, lr=lr, eps=eps)  # ToDo: 1e-8 better?
+
+    def get_opt_state_dict(self):
+        return self.opt.state_dict()
+
+    def load_opt_state_dict(self, state_dict):
+        self.opt.load_state_dict(state_dict)
+
+    def pre_step(self, step):
+        if self.lr_scheduler is not None:
+            cur_lr = self.lr_scheduler(step)
+            for param_group in self.opt.param_groups:
+                param_group['lr'] = cur_lr
+        else:
+            cur_lr = self.init_lr
+        self.opt.zero_grad()
+        return cur_lr 
+ 
+    def step(self):
+        self.opt.step()
+
+    def create_msg(self):
+        return ['Optim.Info.| Algo. = {}\t| Lr = {}\t (schedule = {})'
+                .format(self.opt_type, self.init_lr, self.sch_type)]

ppg2mel/train/option.py

@@ -0,0 +1,10 @@
+# Default parameters which will be imported by solver
+default_hparas = {
+    'GRAD_CLIP': 5.0,          # Grad. clip threshold
+    'PROGRESS_STEP': 100,      # Std. output refresh freq.
+    # Decode steps for objective validation (step = ratio*input_txt_len)
+    'DEV_STEP_RATIO': 1.2,
+    # Number of examples (alignment/text) to show in tensorboard
+    'DEV_N_EXAMPLE': 4,
+    'TB_FLUSH_FREQ': 180       # Update frequency of tensorboard (secs)
+}

ppg2mel/train/solver.py

@@ -0,0 +1,216 @@
+import os
+import sys
+import abc
+import math
+import yaml
+import torch
+from torch.utils.tensorboard import SummaryWriter
+
+from .option import default_hparas
+from utils.util import human_format, Timer
+from utils.load_yaml import HpsYaml
+
+
+class BaseSolver():
+    ''' 
+    Prototype Solver for all kinds of tasks
+    Arguments
+        config - yaml-styled config
+        paras  - argparse outcome
+        mode   - "train"/"test"
+    '''
+
+    def __init__(self, config, paras, mode="train"):
+        # General Settings
+        self.config = config  # load from yaml file
+        self.paras = paras    # command line args  
+        self.mode = mode      # 'train' or 'test'
+        for k, v in default_hparas.items():
+            setattr(self, k, v)
+        self.device = torch.device('cuda') if self.paras.gpu and torch.cuda.is_available() \
+                    else torch.device('cpu')
+
+        # Name experiment
+        self.exp_name = paras.name
+        if self.exp_name is None:
+            if 'exp_name' in self.config:
+                self.exp_name = self.config.exp_name
+            else:
+                # By default, exp is named after config file
+                self.exp_name = paras.config.split('/')[-1].replace('.yaml', '')
+            if mode == 'train':
+                self.exp_name += '_seed{}'.format(paras.seed)
+                    
+
+        if mode == 'train':
+            # Filepath setup
+            os.makedirs(paras.ckpdir, exist_ok=True)
+            self.ckpdir = os.path.join(paras.ckpdir, self.exp_name)
+            os.makedirs(self.ckpdir, exist_ok=True)
+
+            # Logger settings
+            self.logdir = os.path.join(paras.logdir, self.exp_name)
+            self.log = SummaryWriter(
+                self.logdir, flush_secs=self.TB_FLUSH_FREQ)
+            self.timer = Timer()
+
+            # Hyper-parameters
+            self.step = 0
+            self.valid_step = config.hparas.valid_step
+            self.max_step = config.hparas.max_step
+
+            self.verbose('Exp. name : {}'.format(self.exp_name))
+            self.verbose('Loading data... large corpus may took a while.')
+
+        # elif mode == 'test':
+            # # Output path
+            # os.makedirs(paras.outdir, exist_ok=True)
+            # self.ckpdir = os.path.join(paras.outdir, self.exp_name)
+
+            # Load training config to get acoustic feat and build model
+            # self.src_config = HpsYaml(config.src.config) 
+            # self.paras.load = config.src.ckpt
+
+            # self.verbose('Evaluating result of tr. config @ {}'.format(
+                # config.src.config))
+
+    def backward(self, loss):
+        '''
+        Standard backward step with self.timer and debugger
+        Arguments
+            loss - the loss to perform loss.backward()
+        '''
+        self.timer.set()
+        loss.backward()
+        grad_norm = torch.nn.utils.clip_grad_norm_(
+            self.model.parameters(), self.GRAD_CLIP)
+        if math.isnan(grad_norm):
+            self.verbose('Error : grad norm is NaN @ step '+str(self.step))
+        else:
+            self.optimizer.step()
+        self.timer.cnt('bw')
+        return grad_norm
+
+    def load_ckpt(self):
+        ''' Load ckpt if --load option is specified '''
+        if self.paras.load is not None:
+            if self.paras.warm_start:
+                self.verbose(f"Warm starting model from checkpoint {self.paras.load}.")
+                ckpt = torch.load(
+                    self.paras.load, map_location=self.device if self.mode == 'train'
+                                                        else 'cpu')
+                model_dict = ckpt['model']
+                if len(self.config.model.ignore_layers) > 0:
+                    model_dict = {k:v for k, v in model_dict.items()
+                                  if k not in self.config.model.ignore_layers}
+                    dummy_dict = self.model.state_dict()
+                    dummy_dict.update(model_dict)
+                    model_dict = dummy_dict
+                self.model.load_state_dict(model_dict)
+            else:
+                # Load weights
+                ckpt = torch.load(
+                    self.paras.load, map_location=self.device if self.mode == 'train'
+                                                else 'cpu')
+                self.model.load_state_dict(ckpt['model'])
+
+                # Load task-dependent items
+                if self.mode == 'train':
+                    self.step = ckpt['global_step']
+                    self.optimizer.load_opt_state_dict(ckpt['optimizer'])
+                    self.verbose('Load ckpt from {}, restarting at step {}'.format(
+                        self.paras.load, self.step))
+                else:
+                    for k, v in ckpt.items():
+                        if type(v) is float:
+                            metric, score = k, v
+                    self.model.eval()
+                    self.verbose('Evaluation target = {} (recorded {} = {:.2f} %)'.format(
+                        self.paras.load, metric, score))
+
+    def verbose(self, msg):
+        ''' Verbose function for print information to stdout'''
+        if self.paras.verbose:
+            if type(msg) == list:
+                for m in msg:
+                    print('[INFO]', m.ljust(100))
+            else:
+                print('[INFO]', msg.ljust(100))
+
+    def progress(self, msg):
+        ''' Verbose function for updating progress on stdout (do not include newline) '''
+        if self.paras.verbose:
+            sys.stdout.write("\033[K")  # Clear line
+            print('[{}] {}'.format(human_format(self.step), msg), end='\r')
+
+    def write_log(self, log_name, log_dict):
+        '''
+        Write log to TensorBoard
+            log_name  - <str> Name of tensorboard variable 
+            log_value - <dict>/<array> Value of variable (e.g. dict of losses), passed if value = None
+        '''
+        if type(log_dict) is dict:
+            log_dict = {key: val for key, val in log_dict.items() if (
+                val is not None and not math.isnan(val))}
+        if log_dict is None:
+            pass
+        elif len(log_dict) > 0:
+            if 'align' in log_name or 'spec' in log_name:
+                img, form = log_dict
+                self.log.add_image(
+                    log_name, img, global_step=self.step, dataformats=form)
+            elif 'text' in log_name or 'hyp' in log_name:
+                self.log.add_text(log_name, log_dict, self.step)
+            else:
+                self.log.add_scalars(log_name, log_dict, self.step)
+
+    def save_checkpoint(self, f_name, metric, score, show_msg=True):
+        '''' 
+        Ckpt saver
+            f_name - <str> the name of ckpt file (w/o prefix) to store, overwrite if existed
+            score  - <float> The value of metric used to evaluate model
+        '''
+        ckpt_path = os.path.join(self.ckpdir, f_name)
+        full_dict = {
+            "model": self.model.state_dict(),
+            "optimizer": self.optimizer.get_opt_state_dict(),
+            "global_step": self.step,
+            metric: score
+        }
+
+        torch.save(full_dict, ckpt_path)
+        if show_msg:
+            self.verbose("Saved checkpoint (step = {}, {} = {:.2f}) and status @ {}".
+                         format(human_format(self.step), metric, score, ckpt_path))
+
+
+    # ----------------------------------- Abtract Methods ------------------------------------------ #
+    @abc.abstractmethod
+    def load_data(self):
+        '''
+        Called by main to load all data
+        After this call, data related attributes should be setup (e.g. self.tr_set, self.dev_set)
+        No return value
+        '''
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def set_model(self):
+        '''
+        Called by main to set models
+        After this call, model related attributes should be setup (e.g. self.l2_loss)
+        The followings MUST be setup
+            - self.model (torch.nn.Module)
+            - self.optimizer (src.Optimizer),
+                init. w/ self.optimizer = src.Optimizer(self.model.parameters(),**self.config['hparas'])
+        Loading pre-trained model should also be performed here 
+        No return value
+        '''
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def exec(self):
+        '''
+        Called by main to execute training/inference
+        '''
+        raise NotImplementedError

ppg2mel/train/train_linglf02mel_seq2seq_oneshotvc.py

@@ -0,0 +1,288 @@
+import os, sys
+# sys.path.append('/home/shaunxliu/projects/nnsp')
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+from matplotlib.ticker import MaxNLocator
+import torch
+from torch.utils.data import DataLoader
+import numpy as np
+from .solver import BaseSolver
+from utils.data_load import OneshotVcDataset, MultiSpkVcCollate
+# from src.rnn_ppg2mel import BiRnnPpg2MelModel
+# from src.mel_decoder_mol_encAddlf0 import MelDecoderMOL
+from .loss import MaskedMSELoss
+from .optim import Optimizer
+from utils.util import human_format
+from ppg2mel import MelDecoderMOLv2
+
+
+class Solver(BaseSolver):
+    """Customized Solver."""
+    def __init__(self, config, paras, mode):
+        super().__init__(config, paras, mode)
+        self.num_att_plots = 5
+        self.att_ws_dir = f"{self.logdir}/att_ws"
+        os.makedirs(self.att_ws_dir, exist_ok=True)
+        self.best_loss = np.inf
+
+    def fetch_data(self, data):
+        """Move data to device"""
+        data = [i.to(self.device) for i in data]
+        return data
+
+    def load_data(self):
+        """ Load data for training/validation/plotting."""
+        train_dataset = OneshotVcDataset(
+            meta_file=self.config.data.train_fid_list,
+            vctk_ppg_dir=self.config.data.vctk_ppg_dir,
+            libri_ppg_dir=self.config.data.libri_ppg_dir,
+            vctk_f0_dir=self.config.data.vctk_f0_dir,
+            libri_f0_dir=self.config.data.libri_f0_dir,
+            vctk_wav_dir=self.config.data.vctk_wav_dir,
+            libri_wav_dir=self.config.data.libri_wav_dir,
+            vctk_spk_dvec_dir=self.config.data.vctk_spk_dvec_dir,
+            libri_spk_dvec_dir=self.config.data.libri_spk_dvec_dir,
+            ppg_file_ext=self.config.data.ppg_file_ext,
+            min_max_norm_mel=self.config.data.min_max_norm_mel,
+            mel_min=self.config.data.mel_min,
+            mel_max=self.config.data.mel_max,
+        )
+        dev_dataset = OneshotVcDataset(
+            meta_file=self.config.data.dev_fid_list,
+            vctk_ppg_dir=self.config.data.vctk_ppg_dir,
+            libri_ppg_dir=self.config.data.libri_ppg_dir,
+            vctk_f0_dir=self.config.data.vctk_f0_dir,
+            libri_f0_dir=self.config.data.libri_f0_dir,
+            vctk_wav_dir=self.config.data.vctk_wav_dir,
+            libri_wav_dir=self.config.data.libri_wav_dir,
+            vctk_spk_dvec_dir=self.config.data.vctk_spk_dvec_dir,
+            libri_spk_dvec_dir=self.config.data.libri_spk_dvec_dir,
+            ppg_file_ext=self.config.data.ppg_file_ext,
+            min_max_norm_mel=self.config.data.min_max_norm_mel,
+            mel_min=self.config.data.mel_min,
+            mel_max=self.config.data.mel_max,
+        )
+        self.train_dataloader = DataLoader(
+            train_dataset,
+            num_workers=self.paras.njobs,
+            shuffle=True,
+            batch_size=self.config.hparas.batch_size,
+            pin_memory=False,
+            drop_last=True,
+            collate_fn=MultiSpkVcCollate(self.config.model.frames_per_step,
+                                        use_spk_dvec=True),
+        )
+        self.dev_dataloader = DataLoader(
+            dev_dataset,
+            num_workers=self.paras.njobs,
+            shuffle=False,
+            batch_size=self.config.hparas.batch_size,
+            pin_memory=False,
+            drop_last=False,
+            collate_fn=MultiSpkVcCollate(self.config.model.frames_per_step,
+                                         use_spk_dvec=True),
+        )
+        self.plot_dataloader = DataLoader(
+            dev_dataset,
+            num_workers=self.paras.njobs,
+            shuffle=False,
+            batch_size=1,
+            pin_memory=False,
+            drop_last=False,
+            collate_fn=MultiSpkVcCollate(self.config.model.frames_per_step,
+                                         use_spk_dvec=True,
+                                         give_uttids=True),
+        )
+        msg = "Have prepared training set and dev set."
+        self.verbose(msg)
+    
+    def load_pretrained_params(self):
+        print("Load pretrained model from: ", self.config.data.pretrain_model_file)
+        ignore_layer_prefixes = ["speaker_embedding_table"]
+        pretrain_model_file = self.config.data.pretrain_model_file
+        pretrain_ckpt = torch.load(
+            pretrain_model_file, map_location=self.device
+        )["model"]
+        model_dict = self.model.state_dict()
+        print(self.model)
+        
+        # 1. filter out unnecessrary keys
+        for prefix in ignore_layer_prefixes:
+            pretrain_ckpt = {k : v 
+                             for k, v in pretrain_ckpt.items() if not k.startswith(prefix) 
+                            }
+        # 2. overwrite entries in the existing state dict
+        model_dict.update(pretrain_ckpt)
+
+        # 3. load the new state dict
+        self.model.load_state_dict(model_dict)
+
+    def set_model(self):
+        """Setup model and optimizer"""
+        # Model
+        print("[INFO] Model name: ", self.config["model_name"])
+        self.model = MelDecoderMOLv2(
+            **self.config["model"]
+        ).to(self.device)
+        # self.load_pretrained_params()
+
+        # model_params = [{'params': self.model.spk_embedding.weight}]
+        model_params = [{'params': self.model.parameters()}]
+        
+        # Loss criterion
+        self.loss_criterion = MaskedMSELoss(self.config.model.frames_per_step)
+
+        # Optimizer
+        self.optimizer = Optimizer(model_params, **self.config["hparas"])
+        self.verbose(self.optimizer.create_msg())
+
+        # Automatically load pre-trained model if self.paras.load is given
+        self.load_ckpt()
+
+    def exec(self):
+        self.verbose("Total training steps {}.".format(
+            human_format(self.max_step)))
+
+        mel_loss = None
+        n_epochs = 0
+        # Set as current time
+        self.timer.set()
+        
+        while self.step < self.max_step:
+            for data in self.train_dataloader:
+                # Pre-step: updata lr_rate and do zero_grad
+                lr_rate = self.optimizer.pre_step(self.step)
+                total_loss = 0
+                # data to device
+                ppgs, lf0_uvs, mels, in_lengths, \
+                    out_lengths, spk_ids, stop_tokens = self.fetch_data(data)
+                self.timer.cnt("rd")
+                mel_outputs, mel_outputs_postnet, predicted_stop = self.model(
+                    ppgs,
+                    in_lengths,
+                    mels,
+                    out_lengths,
+                    lf0_uvs,
+                    spk_ids
+                ) 
+                mel_loss, stop_loss = self.loss_criterion(
+                    mel_outputs,
+                    mel_outputs_postnet,
+                    mels,
+                    out_lengths,
+                    stop_tokens,
+                    predicted_stop
+                )
+                loss = mel_loss + stop_loss
+
+                self.timer.cnt("fw")
+
+                # Back-prop
+                grad_norm = self.backward(loss)
+                self.step += 1
+
+                # Logger
+                if (self.step == 1) or (self.step % self.PROGRESS_STEP == 0):
+                    self.progress("Tr|loss:{:.4f},mel-loss:{:.4f},stop-loss:{:.4f}|Grad.Norm-{:.2f}|{}"
+                                  .format(loss.cpu().item(), mel_loss.cpu().item(),
+                                    stop_loss.cpu().item(), grad_norm, self.timer.show()))
+                    self.write_log('loss', {'tr/loss': loss,
+                                            'tr/mel-loss': mel_loss,
+                                            'tr/stop-loss': stop_loss})
+
+                # Validation
+                if (self.step == 1) or (self.step % self.valid_step == 0):
+                    self.validate()
+
+                # End of step
+                # https://github.com/pytorch/pytorch/issues/13246#issuecomment-529185354
+                torch.cuda.empty_cache()
+                self.timer.set()
+                if self.step > self.max_step:
+                    break
+            n_epochs += 1
+        self.log.close()
+
+    def validate(self):
+        self.model.eval()
+        dev_loss, dev_mel_loss, dev_stop_loss = 0.0, 0.0, 0.0
+
+        for i, data in enumerate(self.dev_dataloader):
+            self.progress('Valid step - {}/{}'.format(i+1, len(self.dev_dataloader)))
+            # Fetch data
+            ppgs, lf0_uvs, mels, in_lengths, \
+                out_lengths, spk_ids, stop_tokens = self.fetch_data(data)
+            with torch.no_grad():
+                mel_outputs, mel_outputs_postnet, predicted_stop = self.model(
+                    ppgs,
+                    in_lengths,
+                    mels,
+                    out_lengths,
+                    lf0_uvs,
+                    spk_ids
+                ) 
+                mel_loss, stop_loss = self.loss_criterion(
+                    mel_outputs,
+                    mel_outputs_postnet,
+                    mels,
+                    out_lengths,
+                    stop_tokens,
+                    predicted_stop
+                )
+                loss = mel_loss + stop_loss
+
+                dev_loss += loss.cpu().item()
+                dev_mel_loss += mel_loss.cpu().item()
+                dev_stop_loss += stop_loss.cpu().item()
+
+        dev_loss = dev_loss / (i + 1)
+        dev_mel_loss = dev_mel_loss / (i + 1)
+        dev_stop_loss = dev_stop_loss / (i + 1)
+        self.save_checkpoint(f'step_{self.step}.pth', 'loss', dev_loss, show_msg=False)
+        if dev_loss < self.best_loss:
+            self.best_loss = dev_loss
+            self.save_checkpoint(f'best_loss_step_{self.step}.pth', 'loss', dev_loss)
+        self.write_log('loss', {'dv/loss': dev_loss,
+                                'dv/mel-loss': dev_mel_loss,
+                                'dv/stop-loss': dev_stop_loss})
+
+        # plot attention
+        for i, data in enumerate(self.plot_dataloader):
+            if i == self.num_att_plots:
+                break
+            # Fetch data
+            ppgs, lf0_uvs, mels, in_lengths, \
+                out_lengths, spk_ids, stop_tokens = self.fetch_data(data[:-1])
+            fid = data[-1][0]
+            with torch.no_grad():
+                _, _, _, att_ws = self.model(
+                    ppgs,
+                    in_lengths,
+                    mels,
+                    out_lengths,
+                    lf0_uvs,
+                    spk_ids,
+                    output_att_ws=True
+                )
+                att_ws = att_ws.squeeze(0).cpu().numpy()
+                att_ws = att_ws[None]
+                w, h = plt.figaspect(1.0 / len(att_ws))
+                fig = plt.Figure(figsize=(w * 1.3, h * 1.3))
+                axes = fig.subplots(1, len(att_ws))
+                if len(att_ws) == 1:
+                    axes = [axes]
+
+                for ax, aw in zip(axes, att_ws):
+                    ax.imshow(aw.astype(np.float32), aspect="auto")
+                    ax.set_title(f"{fid}")
+                    ax.set_xlabel("Input")
+                    ax.set_ylabel("Output")
+                    ax.xaxis.set_major_locator(MaxNLocator(integer=True))
+                    ax.yaxis.set_major_locator(MaxNLocator(integer=True))
+                fig_name = f"{self.att_ws_dir}/{fid}_step{self.step}.png"
+                fig.savefig(fig_name)
+                
+        # Resume training
+        self.model.train()
+

ppg2mel/utils/abs_model.py

@@ -0,0 +1,23 @@
+from abc import ABC
+from abc import abstractmethod
+
+import torch
+
+class AbsMelDecoder(torch.nn.Module, ABC):
+    """The abstract PPG-based voice conversion class
+    This "model" is one of mediator objects for "Task" class.
+
+    """
+
+    @abstractmethod
+    def forward(
+        self, 
+        bottle_neck_features: torch.Tensor,
+        feature_lengths: torch.Tensor,
+        speech: torch.Tensor,
+        speech_lengths: torch.Tensor,
+        logf0_uv: torch.Tensor = None,
+        spembs: torch.Tensor = None,
+        styleembs: torch.Tensor = None,
+    ) -> torch.Tensor:
+        raise NotImplementedError

ppg2mel/utils/basic_layers.py

@@ -0,0 +1,79 @@
+import torch
+from torch import nn
+from torch.nn import functional as F
+from torch.autograd import Function
+
+def tile(x, count, dim=0):
+    """
+    Tiles x on dimension dim count times.
+    """
+    perm = list(range(len(x.size())))
+    if dim != 0:
+        perm[0], perm[dim] = perm[dim], perm[0]
+        x = x.permute(perm).contiguous()
+    out_size = list(x.size())
+    out_size[0] *= count
+    batch = x.size(0)
+    x = x.view(batch, -1) \
+         .transpose(0, 1) \
+         .repeat(count, 1) \
+         .transpose(0, 1) \
+         .contiguous() \
+         .view(*out_size)
+    if dim != 0:
+        x = x.permute(perm).contiguous()
+    return x
+
+class Linear(torch.nn.Module):
+    def __init__(self, in_dim, out_dim, bias=True, w_init_gain='linear'):
+        super(Linear, self).__init__()
+        self.linear_layer = torch.nn.Linear(in_dim, out_dim, bias=bias)
+
+        torch.nn.init.xavier_uniform_(
+            self.linear_layer.weight,
+            gain=torch.nn.init.calculate_gain(w_init_gain))
+
+    def forward(self, x):
+        return self.linear_layer(x)
+
+class Conv1d(torch.nn.Module):
+    def __init__(self, in_channels, out_channels, kernel_size=1, stride=1,
+                 padding=None, dilation=1, bias=True, w_init_gain='linear', param=None):
+        super(Conv1d, self).__init__()
+        if padding is None:
+            assert(kernel_size % 2 == 1)
+            padding = int(dilation * (kernel_size - 1)/2)
+        
+        self.conv = torch.nn.Conv1d(in_channels, out_channels,
+                                    kernel_size=kernel_size, stride=stride,
+                                    padding=padding, dilation=dilation,
+                                    bias=bias)
+        torch.nn.init.xavier_uniform_(
+            self.conv.weight, gain=torch.nn.init.calculate_gain(w_init_gain, param=param))
+
+    def forward(self, x):
+        # x: BxDxT
+        return self.conv(x)
+
+
+
+def tile(x, count, dim=0):
+    """
+    Tiles x on dimension dim count times.
+    """
+    perm = list(range(len(x.size())))
+    if dim != 0:
+        perm[0], perm[dim] = perm[dim], perm[0]
+        x = x.permute(perm).contiguous()
+    out_size = list(x.size())
+    out_size[0] *= count
+    batch = x.size(0)
+    x = x.view(batch, -1) \
+         .transpose(0, 1) \
+         .repeat(count, 1) \
+         .transpose(0, 1) \
+         .contiguous() \
+         .view(*out_size)
+    if dim != 0:
+        x = x.permute(perm).contiguous()
+    return x

ppg2mel/utils/cnn_postnet.py

@@ -0,0 +1,52 @@
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from .basic_layers import Linear, Conv1d
+
+
+class Postnet(nn.Module):
+    """Postnet
+        - Five 1-d convolution with 512 channels and kernel size 5
+    """
+    def __init__(self, num_mels=80,
+                 num_layers=5,
+                 hidden_dim=512,
+                 kernel_size=5):
+        super(Postnet, self).__init__()
+        self.convolutions = nn.ModuleList()
+
+        self.convolutions.append(
+            nn.Sequential(
+                Conv1d(
+                    num_mels, hidden_dim,
+                    kernel_size=kernel_size, stride=1,
+                    padding=int((kernel_size - 1) / 2),
+                    dilation=1, w_init_gain='tanh'),
+                nn.BatchNorm1d(hidden_dim)))
+
+        for i in range(1, num_layers - 1):
+            self.convolutions.append(
+                nn.Sequential(
+                    Conv1d(
+                        hidden_dim,
+                        hidden_dim,
+                        kernel_size=kernel_size, stride=1,
+                        padding=int((kernel_size - 1) / 2),
+                        dilation=1, w_init_gain='tanh'),
+                    nn.BatchNorm1d(hidden_dim)))
+
+        self.convolutions.append(
+            nn.Sequential(
+                Conv1d(
+                    hidden_dim, num_mels,
+                    kernel_size=kernel_size, stride=1,
+                    padding=int((kernel_size - 1) / 2),
+                    dilation=1, w_init_gain='linear'),
+                nn.BatchNorm1d(num_mels)))
+
+    def forward(self, x):
+        # x: (B, num_mels, T_dec)
+        for i in range(len(self.convolutions) - 1):
+            x = F.dropout(torch.tanh(self.convolutions[i](x)), 0.5, self.training)
+        x = F.dropout(self.convolutions[-1](x), 0.5, self.training)
+        return x

ppg2mel/utils/mol_attention.py

@@ -0,0 +1,123 @@
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+
+class MOLAttention(nn.Module):
+    """ Discretized Mixture of Logistic (MOL) attention.
+    C.f. Section 5 of "MelNet: A Generative Model for Audio in the Frequency Domain" and 
+        GMMv2b model in "Location-relative attention mechanisms for robust long-form speech synthesis".
+    """
+    def __init__(
+        self,
+        query_dim,
+        r=1,
+        M=5,
+    ):
+        """
+        Args:
+            query_dim: attention_rnn_dim.
+            M: number of mixtures.
+        """
+        super().__init__()
+        if r < 1:
+            self.r = float(r)
+        else:
+            self.r = int(r)
+        self.M = M
+        self.score_mask_value = 0.0 # -float("inf")
+        self.eps = 1e-5
+        # Position arrary for encoder time steps
+        self.J = None
+        # Query layer: [w, sigma,]
+        self.query_layer = torch.nn.Sequential(
+            nn.Linear(query_dim, 256, bias=True),
+            nn.ReLU(),
+            nn.Linear(256, 3*M, bias=True)
+        )
+        self.mu_prev = None
+        self.initialize_bias()
+
+    def initialize_bias(self):
+        """Initialize sigma and Delta."""
+        # sigma
+        torch.nn.init.constant_(self.query_layer[2].bias[self.M:2*self.M], 1.0)
+        # Delta: softplus(1.8545) = 2.0; softplus(3.9815) = 4.0; softplus(0.5413) = 1.0
+        # softplus(-0.432) = 0.5003
+        if self.r == 2:
+            torch.nn.init.constant_(self.query_layer[2].bias[2*self.M:3*self.M], 1.8545)
+        elif self.r == 4:
+            torch.nn.init.constant_(self.query_layer[2].bias[2*self.M:3*self.M], 3.9815)
+        elif self.r == 1:
+            torch.nn.init.constant_(self.query_layer[2].bias[2*self.M:3*self.M], 0.5413)
+        else:
+            torch.nn.init.constant_(self.query_layer[2].bias[2*self.M:3*self.M], -0.432)
+
+    
+    def init_states(self, memory):
+        """Initialize mu_prev and J.
+            This function should be called by the decoder before decoding one batch.
+        Args:
+            memory: (B, T, D_enc) encoder output.
+        """
+        B, T_enc, _ = memory.size()
+        device = memory.device
+        self.J = torch.arange(0, T_enc + 2.0).to(device) + 0.5  # NOTE: for discretize usage
+        # self.J = memory.new_tensor(np.arange(T_enc), dtype=torch.float)
+        self.mu_prev = torch.zeros(B, self.M).to(device)
+
+    def forward(self, att_rnn_h, memory, memory_pitch=None, mask=None):
+        """
+        att_rnn_h: attetion rnn hidden state.
+        memory: encoder outputs (B, T_enc, D).
+        mask: binary mask for padded data (B, T_enc).
+        """
+        # [B, 3M]
+        mixture_params = self.query_layer(att_rnn_h)
+        
+        # [B, M]
+        w_hat = mixture_params[:, :self.M]
+        sigma_hat = mixture_params[:, self.M:2*self.M]
+        Delta_hat = mixture_params[:, 2*self.M:3*self.M]
+        
+        # print("w_hat: ", w_hat)
+        # print("sigma_hat: ", sigma_hat)
+        # print("Delta_hat: ", Delta_hat)
+
+        # Dropout to de-correlate attention heads
+        w_hat = F.dropout(w_hat, p=0.5, training=self.training) # NOTE(sx): needed?
+        
+        # Mixture parameters
+        w = torch.softmax(w_hat, dim=-1) + self.eps
+        sigma = F.softplus(sigma_hat) + self.eps
+        Delta = F.softplus(Delta_hat)
+        mu_cur = self.mu_prev + Delta
+        # print("w:", w)
+        j = self.J[:memory.size(1) + 1]
+
+        # Attention weights
+        # CDF of logistic distribution
+        phi_t = w.unsqueeze(-1) * (1 / (1 + torch.sigmoid(
+            (mu_cur.unsqueeze(-1) - j) / sigma.unsqueeze(-1))))
+        # print("phi_t:", phi_t)
+        
+        # Discretize attention weights
+        # (B, T_enc + 1)
+        alpha_t = torch.sum(phi_t, dim=1)
+        alpha_t = alpha_t[:, 1:] - alpha_t[:, :-1]
+        alpha_t[alpha_t == 0] = self.eps
+        # print("alpha_t: ", alpha_t.size())
+        # Apply masking
+        if mask is not None:
+            alpha_t.data.masked_fill_(mask, self.score_mask_value)
+
+        context = torch.bmm(alpha_t.unsqueeze(1), memory).squeeze(1)
+        if memory_pitch is not None:
+            context_pitch = torch.bmm(alpha_t.unsqueeze(1), memory_pitch).squeeze(1)
+
+        self.mu_prev = mu_cur
+        
+        if memory_pitch is not None:
+            return context, context_pitch, alpha_t
+        return context, alpha_t
+

ppg2mel/utils/nets_utils.py

@@ -0,0 +1,451 @@
+# -*- coding: utf-8 -*-
+
+"""Network related utility tools."""
+
+import logging
+from typing import Dict
+
+import numpy as np
+import torch
+
+
+def to_device(m, x):
+    """Send tensor into the device of the module.
+
+    Args:
+        m (torch.nn.Module): Torch module.
+        x (Tensor): Torch tensor.
+
+    Returns:
+        Tensor: Torch tensor located in the same place as torch module.
+
+    """
+    assert isinstance(m, torch.nn.Module)
+    device = next(m.parameters()).device
+    return x.to(device)
+
+
+def pad_list(xs, pad_value):
+    """Perform padding for the list of tensors.
+
+    Args:
+        xs (List): List of Tensors [(T_1, `*`), (T_2, `*`), ..., (T_B, `*`)].
+        pad_value (float): Value for padding.
+
+    Returns:
+        Tensor: Padded tensor (B, Tmax, `*`).
+
+    Examples:
+        >>> x = [torch.ones(4), torch.ones(2), torch.ones(1)]
+        >>> x
+        [tensor([1., 1., 1., 1.]), tensor([1., 1.]), tensor([1.])]
+        >>> pad_list(x, 0)
+        tensor([[1., 1., 1., 1.],
+                [1., 1., 0., 0.],
+                [1., 0., 0., 0.]])
+
+    """
+    n_batch = len(xs)
+    max_len = max(x.size(0) for x in xs)
+    pad = xs[0].new(n_batch, max_len, *xs[0].size()[1:]).fill_(pad_value)
+
+    for i in range(n_batch):
+        pad[i, :xs[i].size(0)] = xs[i]
+
+    return pad
+
+
+def make_pad_mask(lengths, xs=None, length_dim=-1):
+    """Make mask tensor containing indices of padded part.
+
+    Args:
+        lengths (LongTensor or List): Batch of lengths (B,).
+        xs (Tensor, optional): The reference tensor. If set, masks will be the same shape as this tensor.
+        length_dim (int, optional): Dimension indicator of the above tensor. See the example.
+
+    Returns:
+        Tensor: Mask tensor containing indices of padded part.
+                dtype=torch.uint8 in PyTorch 1.2-
+                dtype=torch.bool in PyTorch 1.2+ (including 1.2)
+
+    Examples:
+        With only lengths.
+
+        >>> lengths = [5, 3, 2]
+        >>> make_non_pad_mask(lengths)
+        masks = [[0, 0, 0, 0 ,0],
+                 [0, 0, 0, 1, 1],
+                 [0, 0, 1, 1, 1]]
+
+        With the reference tensor.
+
+        >>> xs = torch.zeros((3, 2, 4))
+        >>> make_pad_mask(lengths, xs)
+        tensor([[[0, 0, 0, 0],
+                 [0, 0, 0, 0]],
+                [[0, 0, 0, 1],
+                 [0, 0, 0, 1]],
+                [[0, 0, 1, 1],
+                 [0, 0, 1, 1]]], dtype=torch.uint8)
+        >>> xs = torch.zeros((3, 2, 6))
+        >>> make_pad_mask(lengths, xs)
+        tensor([[[0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1]],
+                [[0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1]],
+                [[0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1]]], dtype=torch.uint8)
+
+        With the reference tensor and dimension indicator.
+
+        >>> xs = torch.zeros((3, 6, 6))
+        >>> make_pad_mask(lengths, xs, 1)
+        tensor([[[0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [1, 1, 1, 1, 1, 1]],
+                [[0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1]],
+                [[0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1]]], dtype=torch.uint8)
+        >>> make_pad_mask(lengths, xs, 2)
+        tensor([[[0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1]],
+                [[0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1]],
+                [[0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1]]], dtype=torch.uint8)
+
+    """
+    if length_dim == 0:
+        raise ValueError('length_dim cannot be 0: {}'.format(length_dim))
+
+    if not isinstance(lengths, list):
+        lengths = lengths.tolist()
+    bs = int(len(lengths))
+    if xs is None:
+        maxlen = int(max(lengths))
+    else:
+        maxlen = xs.size(length_dim)
+
+    seq_range = torch.arange(0, maxlen, dtype=torch.int64)
+    seq_range_expand = seq_range.unsqueeze(0).expand(bs, maxlen)
+    seq_length_expand = seq_range_expand.new(lengths).unsqueeze(-1)
+    mask = seq_range_expand >= seq_length_expand
+
+    if xs is not None:
+        assert xs.size(0) == bs, (xs.size(0), bs)
+
+        if length_dim < 0:
+            length_dim = xs.dim() + length_dim
+        # ind = (:, None, ..., None, :, , None, ..., None)
+        ind = tuple(slice(None) if i in (0, length_dim) else None
+                    for i in range(xs.dim()))
+        mask = mask[ind].expand_as(xs).to(xs.device)
+    return mask
+
+
+def make_non_pad_mask(lengths, xs=None, length_dim=-1):
+    """Make mask tensor containing indices of non-padded part.
+
+    Args:
+        lengths (LongTensor or List): Batch of lengths (B,).
+        xs (Tensor, optional): The reference tensor. If set, masks will be the same shape as this tensor.
+        length_dim (int, optional): Dimension indicator of the above tensor. See the example.
+
+    Returns:
+        ByteTensor: mask tensor containing indices of padded part.
+                    dtype=torch.uint8 in PyTorch 1.2-
+                    dtype=torch.bool in PyTorch 1.2+ (including 1.2)
+
+    Examples:
+        With only lengths.
+
+        >>> lengths = [5, 3, 2]
+        >>> make_non_pad_mask(lengths)
+        masks = [[1, 1, 1, 1 ,1],
+                 [1, 1, 1, 0, 0],
+                 [1, 1, 0, 0, 0]]
+
+        With the reference tensor.
+
+        >>> xs = torch.zeros((3, 2, 4))
+        >>> make_non_pad_mask(lengths, xs)
+        tensor([[[1, 1, 1, 1],
+                 [1, 1, 1, 1]],
+                [[1, 1, 1, 0],
+                 [1, 1, 1, 0]],
+                [[1, 1, 0, 0],
+                 [1, 1, 0, 0]]], dtype=torch.uint8)
+        >>> xs = torch.zeros((3, 2, 6))
+        >>> make_non_pad_mask(lengths, xs)
+        tensor([[[1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0]],
+                [[1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0]],
+                [[1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0]]], dtype=torch.uint8)
+
+        With the reference tensor and dimension indicator.
+
+        >>> xs = torch.zeros((3, 6, 6))
+        >>> make_non_pad_mask(lengths, xs, 1)
+        tensor([[[1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [0, 0, 0, 0, 0, 0]],
+                [[1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0]],
+                [[1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0]]], dtype=torch.uint8)
+        >>> make_non_pad_mask(lengths, xs, 2)
+        tensor([[[1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0]],
+                [[1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0]],
+                [[1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0]]], dtype=torch.uint8)
+
+    """
+    return ~make_pad_mask(lengths, xs, length_dim)
+
+
+def mask_by_length(xs, lengths, fill=0):
+    """Mask tensor according to length.
+
+    Args:
+        xs (Tensor): Batch of input tensor (B, `*`).
+        lengths (LongTensor or List): Batch of lengths (B,).
+        fill (int or float): Value to fill masked part.
+
+    Returns:
+        Tensor: Batch of masked input tensor (B, `*`).
+
+    Examples:
+        >>> x = torch.arange(5).repeat(3, 1) + 1
+        >>> x
+        tensor([[1, 2, 3, 4, 5],
+                [1, 2, 3, 4, 5],
+                [1, 2, 3, 4, 5]])
+        >>> lengths = [5, 3, 2]
+        >>> mask_by_length(x, lengths)
+        tensor([[1, 2, 3, 4, 5],
+                [1, 2, 3, 0, 0],
+                [1, 2, 0, 0, 0]])
+
+    """
+    assert xs.size(0) == len(lengths)
+    ret = xs.data.new(*xs.size()).fill_(fill)
+    for i, l in enumerate(lengths):
+        ret[i, :l] = xs[i, :l]
+    return ret
+
+
+def th_accuracy(pad_outputs, pad_targets, ignore_label):
+    """Calculate accuracy.
+
+    Args:
+        pad_outputs (Tensor): Prediction tensors (B * Lmax, D).
+        pad_targets (LongTensor): Target label tensors (B, Lmax, D).
+        ignore_label (int): Ignore label id.
+
+    Returns:
+        float: Accuracy value (0.0 - 1.0).
+
+    """
+    pad_pred = pad_outputs.view(
+        pad_targets.size(0),
+        pad_targets.size(1),
+        pad_outputs.size(1)).argmax(2)
+    mask = pad_targets != ignore_label
+    numerator = torch.sum(pad_pred.masked_select(mask) == pad_targets.masked_select(mask))
+    denominator = torch.sum(mask)
+    return float(numerator) / float(denominator)
+
+
+def to_torch_tensor(x):
+    """Change to torch.Tensor or ComplexTensor from numpy.ndarray.
+
+    Args:
+        x: Inputs. It should be one of numpy.ndarray, Tensor, ComplexTensor, and dict.
+
+    Returns:
+        Tensor or ComplexTensor: Type converted inputs.
+
+    Examples:
+        >>> xs = np.ones(3, dtype=np.float32)
+        >>> xs = to_torch_tensor(xs)
+        tensor([1., 1., 1.])
+        >>> xs = torch.ones(3, 4, 5)
+        >>> assert to_torch_tensor(xs) is xs
+        >>> xs = {'real': xs, 'imag': xs}
+        >>> to_torch_tensor(xs)
+        ComplexTensor(
+        Real:
+        tensor([1., 1., 1.])
+        Imag;
+        tensor([1., 1., 1.])
+        )
+
+    """
+    # If numpy, change to torch tensor
+    if isinstance(x, np.ndarray):
+        if x.dtype.kind == 'c':
+            # Dynamically importing because torch_complex requires python3
+            from torch_complex.tensor import ComplexTensor
+            return ComplexTensor(x)
+        else:
+            return torch.from_numpy(x)
+
+    # If {'real': ..., 'imag': ...}, convert to ComplexTensor
+    elif isinstance(x, dict):
+        # Dynamically importing because torch_complex requires python3
+        from torch_complex.tensor import ComplexTensor
+
+        if 'real' not in x or 'imag' not in x:
+            raise ValueError("has 'real' and 'imag' keys: {}".format(list(x)))
+        # Relative importing because of using python3 syntax
+        return ComplexTensor(x['real'], x['imag'])
+
+    # If torch.Tensor, as it is
+    elif isinstance(x, torch.Tensor):
+        return x
+
+    else:
+        error = ("x must be numpy.ndarray, torch.Tensor or a dict like "
+                 "{{'real': torch.Tensor, 'imag': torch.Tensor}}, "
+                 "but got {}".format(type(x)))
+        try:
+            from torch_complex.tensor import ComplexTensor
+        except Exception:
+            # If PY2
+            raise ValueError(error)
+        else:
+            # If PY3
+            if isinstance(x, ComplexTensor):
+                return x
+            else:
+                raise ValueError(error)
+
+
+def get_subsample(train_args, mode, arch):
+    """Parse the subsampling factors from the training args for the specified `mode` and `arch`.
+
+    Args:
+        train_args: argument Namespace containing options.
+        mode: one of ('asr', 'mt', 'st')
+        arch: one of ('rnn', 'rnn-t', 'rnn_mix', 'rnn_mulenc', 'transformer')
+
+    Returns:
+        np.ndarray / List[np.ndarray]: subsampling factors.
+    """
+    if arch == 'transformer':
+        return np.array([1])
+
+    elif mode == 'mt' and arch == 'rnn':
+        # +1 means input (+1) and layers outputs (train_args.elayer)
+        subsample = np.ones(train_args.elayers + 1, dtype=np.int)
+        logging.warning('Subsampling is not performed for machine translation.')
+        logging.info('subsample: ' + ' '.join([str(x) for x in subsample]))
+        return subsample
+
+    elif (mode == 'asr' and arch in ('rnn', 'rnn-t')) or \
+         (mode == 'mt' and arch == 'rnn') or \
+         (mode == 'st' and arch == 'rnn'):
+        subsample = np.ones(train_args.elayers + 1, dtype=np.int)
+        if train_args.etype.endswith("p") and not train_args.etype.startswith("vgg"):
+            ss = train_args.subsample.split("_")
+            for j in range(min(train_args.elayers + 1, len(ss))):
+                subsample[j] = int(ss[j])
+        else:
+            logging.warning(
+                'Subsampling is not performed for vgg*. It is performed in max pooling layers at CNN.')
+        logging.info('subsample: ' + ' '.join([str(x) for x in subsample]))
+        return subsample
+
+    elif mode == 'asr' and arch == 'rnn_mix':
+        subsample = np.ones(train_args.elayers_sd + train_args.elayers + 1, dtype=np.int)
+        if train_args.etype.endswith("p") and not train_args.etype.startswith("vgg"):
+            ss = train_args.subsample.split("_")
+            for j in range(min(train_args.elayers_sd + train_args.elayers + 1, len(ss))):
+                subsample[j] = int(ss[j])
+        else:
+            logging.warning(
+                'Subsampling is not performed for vgg*. It is performed in max pooling layers at CNN.')
+        logging.info('subsample: ' + ' '.join([str(x) for x in subsample]))
+        return subsample
+
+    elif mode == 'asr' and arch == 'rnn_mulenc':
+        subsample_list = []
+        for idx in range(train_args.num_encs):
+            subsample = np.ones(train_args.elayers[idx] + 1, dtype=np.int)
+            if train_args.etype[idx].endswith("p") and not train_args.etype[idx].startswith("vgg"):
+                ss = train_args.subsample[idx].split("_")
+                for j in range(min(train_args.elayers[idx] + 1, len(ss))):
+                    subsample[j] = int(ss[j])
+            else:
+                logging.warning(
+                    'Encoder %d: Subsampling is not performed for vgg*. '
+                    'It is performed in max pooling layers at CNN.', idx + 1)
+            logging.info('subsample: ' + ' '.join([str(x) for x in subsample]))
+            subsample_list.append(subsample)
+        return subsample_list
+
+    else:
+        raise ValueError('Invalid options: mode={}, arch={}'.format(mode, arch))
+
+
+def rename_state_dict(old_prefix: str, new_prefix: str, state_dict: Dict[str, torch.Tensor]):
+    """Replace keys of old prefix with new prefix in state dict."""
+    # need this list not to break the dict iterator
+    old_keys = [k for k in state_dict if k.startswith(old_prefix)]
+    if len(old_keys) > 0:
+        logging.warning(f'Rename: {old_prefix} -> {new_prefix}')
+    for k in old_keys:
+        v = state_dict.pop(k)
+        new_k = k.replace(old_prefix, new_prefix)
+        state_dict[new_k] = v

ppg2mel/utils/vc_utils.py

@@ -0,0 +1,22 @@
+import torch
+
+
+def gcd(a, b):  
+    """Greatest common divisor."""
+    a, b = (a, b) if a >=b else (b, a)
+    if a%b == 0:  
+        return b  
+    else :  
+        return gcd(b, a%b) 
+
+def lcm(a, b):
+    """Least common multiple"""
+    return a * b // gcd(a, b)
+
+def get_mask_from_lengths(lengths, max_len=None):
+    if max_len is None:
+        max_len = torch.max(lengths).item()
+    ids = torch.arange(0, max_len, out=torch.cuda.LongTensor(max_len))
+    mask = (ids < lengths.unsqueeze(1)).bool()
+    return mask
+

ppg_extractor/__init__.py

@@ -0,0 +1,102 @@
+import argparse
+import torch
+from pathlib import Path
+import yaml
+
+from .frontend import DefaultFrontend
+from .utterance_mvn import UtteranceMVN
+from .encoder.conformer_encoder import ConformerEncoder
+
+_model = None # type: PPGModel
+_device = None
+
+class PPGModel(torch.nn.Module):
+    def __init__(
+        self,
+        frontend,
+        normalizer,
+        encoder,
+    ):
+        super().__init__()
+        self.frontend = frontend
+        self.normalize = normalizer
+        self.encoder = encoder
+
+    def forward(self, speech, speech_lengths):
+        """
+
+        Args:
+            speech (tensor): (B, L)
+            speech_lengths (tensor): (B, )
+
+        Returns:
+            bottle_neck_feats (tensor): (B, L//hop_size, 144)
+
+        """
+        feats, feats_lengths = self._extract_feats(speech, speech_lengths)
+        feats, feats_lengths = self.normalize(feats, feats_lengths)
+        encoder_out, encoder_out_lens, _ = self.encoder(feats, feats_lengths)
+        return encoder_out
+
+    def _extract_feats(
+        self, speech: torch.Tensor, speech_lengths: torch.Tensor
+    ):
+        assert speech_lengths.dim() == 1, speech_lengths.shape
+
+        # for data-parallel
+        speech = speech[:, : speech_lengths.max()]
+
+        if self.frontend is not None:
+            # Frontend
+            #  e.g. STFT and Feature extract
+            #       data_loader may send time-domain signal in this case
+            # speech (Batch, NSamples) -> feats: (Batch, NFrames, Dim)
+            feats, feats_lengths = self.frontend(speech, speech_lengths)
+        else:
+            # No frontend and no feature extract
+            feats, feats_lengths = speech, speech_lengths
+        return feats, feats_lengths
+        
+    def extract_from_wav(self, src_wav):
+        src_wav_tensor = torch.from_numpy(src_wav).unsqueeze(0).float().to(_device)
+        src_wav_lengths = torch.LongTensor([len(src_wav)]).to(_device)
+        return self(src_wav_tensor, src_wav_lengths)
+
+
+def build_model(args):
+    normalizer = UtteranceMVN(**args.normalize_conf)
+    frontend = DefaultFrontend(**args.frontend_conf)
+    encoder = ConformerEncoder(input_size=80, **args.encoder_conf)
+    model = PPGModel(frontend, normalizer, encoder)
+    
+    return model
+
+
+def load_model(model_file, device=None):
+    global _model, _device
+    
+    if device is None:
+        _device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+    else:
+        _device = device
+    # search a config file
+    model_config_fpaths = list(model_file.parent.rglob("*.yaml"))
+    config_file = model_config_fpaths[0]
+    with config_file.open("r", encoding="utf-8") as f:
+        args = yaml.safe_load(f)
+
+    args = argparse.Namespace(**args)
+
+    model = build_model(args)
+    model_state_dict = model.state_dict()
+
+    ckpt_state_dict = torch.load(model_file, map_location=_device)
+    ckpt_state_dict = {k:v for k,v in ckpt_state_dict.items() if 'encoder' in k}
+
+    model_state_dict.update(ckpt_state_dict)
+    model.load_state_dict(model_state_dict)
+
+    _model = model.eval().to(_device)
+    return _model
+
+

ppg_extractor/e2e_asr_common.py

@@ -0,0 +1,398 @@
+#!/usr/bin/env python3
+
+# Copyright 2017 Johns Hopkins University (Shinji Watanabe)
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Common functions for ASR."""
+
+import argparse
+import editdistance
+import json
+import logging
+import numpy as np
+import six
+import sys
+
+from itertools import groupby
+
+
+def end_detect(ended_hyps, i, M=3, D_end=np.log(1 * np.exp(-10))):
+    """End detection.
+
+    desribed in Eq. (50) of S. Watanabe et al
+    "Hybrid CTC/Attention Architecture for End-to-End Speech Recognition"
+
+    :param ended_hyps:
+    :param i:
+    :param M:
+    :param D_end:
+    :return:
+    """
+    if len(ended_hyps) == 0:
+        return False
+    count = 0
+    best_hyp = sorted(ended_hyps, key=lambda x: x['score'], reverse=True)[0]
+    for m in six.moves.range(M):
+        # get ended_hyps with their length is i - m
+        hyp_length = i - m
+        hyps_same_length = [x for x in ended_hyps if len(x['yseq']) == hyp_length]
+        if len(hyps_same_length) > 0:
+            best_hyp_same_length = sorted(hyps_same_length, key=lambda x: x['score'], reverse=True)[0]
+            if best_hyp_same_length['score'] - best_hyp['score'] < D_end:
+                count += 1
+
+    if count == M:
+        return True
+    else:
+        return False
+
+
+# TODO(takaaki-hori): add different smoothing methods
+def label_smoothing_dist(odim, lsm_type, transcript=None, blank=0):
+    """Obtain label distribution for loss smoothing.
+
+    :param odim:
+    :param lsm_type:
+    :param blank:
+    :param transcript:
+    :return:
+    """
+    if transcript is not None:
+        with open(transcript, 'rb') as f:
+            trans_json = json.load(f)['utts']
+
+    if lsm_type == 'unigram':
+        assert transcript is not None, 'transcript is required for %s label smoothing' % lsm_type
+        labelcount = np.zeros(odim)
+        for k, v in trans_json.items():
+            ids = np.array([int(n) for n in v['output'][0]['tokenid'].split()])
+            # to avoid an error when there is no text in an uttrance
+            if len(ids) > 0:
+                labelcount[ids] += 1
+        labelcount[odim - 1] = len(transcript)  # count <eos>
+        labelcount[labelcount == 0] = 1  # flooring
+        labelcount[blank] = 0  # remove counts for blank
+        labeldist = labelcount.astype(np.float32) / np.sum(labelcount)
+    else:
+        logging.error(
+            "Error: unexpected label smoothing type: %s" % lsm_type)
+        sys.exit()
+
+    return labeldist
+
+
+def get_vgg2l_odim(idim, in_channel=3, out_channel=128, downsample=True):
+    """Return the output size of the VGG frontend.
+
+    :param in_channel: input channel size
+    :param out_channel: output channel size
+    :return: output size
+    :rtype int
+    """
+    idim = idim / in_channel
+    if downsample:
+        idim = np.ceil(np.array(idim, dtype=np.float32) / 2)  # 1st max pooling
+        idim = np.ceil(np.array(idim, dtype=np.float32) / 2)  # 2nd max pooling
+    return int(idim) * out_channel  # numer of channels
+
+
+class ErrorCalculator(object):
+    """Calculate CER and WER for E2E_ASR and CTC models during training.
+
+    :param y_hats: numpy array with predicted text
+    :param y_pads: numpy array with true (target) text
+    :param char_list:
+    :param sym_space:
+    :param sym_blank:
+    :return:
+    """
+
+    def __init__(self, char_list, sym_space, sym_blank, report_cer=False, report_wer=False,
+                 trans_type="char"):
+        """Construct an ErrorCalculator object."""
+        super(ErrorCalculator, self).__init__()
+
+        self.report_cer = report_cer
+        self.report_wer = report_wer
+        self.trans_type = trans_type
+        self.char_list = char_list
+        self.space = sym_space
+        self.blank = sym_blank
+        self.idx_blank = self.char_list.index(self.blank)
+        if self.space in self.char_list:
+            self.idx_space = self.char_list.index(self.space)
+        else:
+            self.idx_space = None
+
+    def __call__(self, ys_hat, ys_pad, is_ctc=False):
+        """Calculate sentence-level WER/CER score.
+
+        :param torch.Tensor ys_hat: prediction (batch, seqlen)
+        :param torch.Tensor ys_pad: reference (batch, seqlen)
+        :param bool is_ctc: calculate CER score for CTC
+        :return: sentence-level WER score
+        :rtype float
+        :return: sentence-level CER score
+        :rtype float
+        """
+        cer, wer = None, None
+        if is_ctc:
+            return self.calculate_cer_ctc(ys_hat, ys_pad)
+        elif not self.report_cer and not self.report_wer:
+            return cer, wer
+
+        seqs_hat, seqs_true = self.convert_to_char(ys_hat, ys_pad)
+        if self.report_cer:
+            cer = self.calculate_cer(seqs_hat, seqs_true)
+
+        if self.report_wer:
+            wer = self.calculate_wer(seqs_hat, seqs_true)
+        return cer, wer
+
+    def calculate_cer_ctc(self, ys_hat, ys_pad):
+        """Calculate sentence-level CER score for CTC.
+
+        :param torch.Tensor ys_hat: prediction (batch, seqlen)
+        :param torch.Tensor ys_pad: reference (batch, seqlen)
+        :return: average sentence-level CER score
+        :rtype float
+        """
+        cers, char_ref_lens = [], []
+        for i, y in enumerate(ys_hat):
+            y_hat = [x[0] for x in groupby(y)]
+            y_true = ys_pad[i]
+            seq_hat, seq_true = [], []
+            for idx in y_hat:
+                idx = int(idx)
+                if idx != -1 and idx != self.idx_blank and idx != self.idx_space:
+                    seq_hat.append(self.char_list[int(idx)])
+
+            for idx in y_true:
+                idx = int(idx)
+                if idx != -1 and idx != self.idx_blank and idx != self.idx_space:
+                    seq_true.append(self.char_list[int(idx)])
+            if self.trans_type == "char":
+                hyp_chars = "".join(seq_hat)
+                ref_chars = "".join(seq_true)
+            else:
+                hyp_chars = " ".join(seq_hat)
+                ref_chars = " ".join(seq_true)
+
+            if len(ref_chars) > 0:
+                cers.append(editdistance.eval(hyp_chars, ref_chars))
+                char_ref_lens.append(len(ref_chars))
+
+        cer_ctc = float(sum(cers)) / sum(char_ref_lens) if cers else None
+        return cer_ctc
+
+    def convert_to_char(self, ys_hat, ys_pad):
+        """Convert index to character.
+
+        :param torch.Tensor seqs_hat: prediction (batch, seqlen)
+        :param torch.Tensor seqs_true: reference (batch, seqlen)
+        :return: token list of prediction
+        :rtype list
+        :return: token list of reference
+        :rtype list
+        """
+        seqs_hat, seqs_true = [], []
+        for i, y_hat in enumerate(ys_hat):
+            y_true = ys_pad[i]
+            eos_true = np.where(y_true == -1)[0]
+            eos_true = eos_true[0] if len(eos_true) > 0 else len(y_true)
+            # To avoid wrong higher WER than the one obtained from the decoding
+            # eos from y_true is used to mark the eos in y_hat
+            # because of that y_hats has not padded outs with -1.
+            seq_hat = [self.char_list[int(idx)] for idx in y_hat[:eos_true]]
+            seq_true = [self.char_list[int(idx)] for idx in y_true if int(idx) != -1]
+            # seq_hat_text = "".join(seq_hat).replace(self.space, ' ')
+            seq_hat_text = " ".join(seq_hat).replace(self.space, ' ')
+            seq_hat_text = seq_hat_text.replace(self.blank, '')
+            # seq_true_text = "".join(seq_true).replace(self.space, ' ')
+            seq_true_text = " ".join(seq_true).replace(self.space, ' ')
+            seqs_hat.append(seq_hat_text)
+            seqs_true.append(seq_true_text)
+        return seqs_hat, seqs_true
+
+    def calculate_cer(self, seqs_hat, seqs_true):
+        """Calculate sentence-level CER score.
+
+        :param list seqs_hat: prediction
+        :param list seqs_true: reference
+        :return: average sentence-level CER score
+        :rtype float
+        """
+        char_eds, char_ref_lens = [], []
+        for i, seq_hat_text in enumerate(seqs_hat):
+            seq_true_text = seqs_true[i]
+            hyp_chars = seq_hat_text.replace(' ', '')
+            ref_chars = seq_true_text.replace(' ', '')
+            char_eds.append(editdistance.eval(hyp_chars, ref_chars))
+            char_ref_lens.append(len(ref_chars))
+        return float(sum(char_eds)) / sum(char_ref_lens)
+
+    def calculate_wer(self, seqs_hat, seqs_true):
+        """Calculate sentence-level WER score.
+
+        :param list seqs_hat: prediction
+        :param list seqs_true: reference
+        :return: average sentence-level WER score
+        :rtype float
+        """
+        word_eds, word_ref_lens = [], []
+        for i, seq_hat_text in enumerate(seqs_hat):
+            seq_true_text = seqs_true[i]
+            hyp_words = seq_hat_text.split()
+            ref_words = seq_true_text.split()
+            word_eds.append(editdistance.eval(hyp_words, ref_words))
+            word_ref_lens.append(len(ref_words))
+        return float(sum(word_eds)) / sum(word_ref_lens)
+
+
+class ErrorCalculatorTrans(object):
+    """Calculate CER and WER for transducer models.
+
+    Args:
+        decoder (nn.Module): decoder module
+        args (Namespace): argument Namespace containing options
+        report_cer (boolean): compute CER option
+        report_wer (boolean): compute WER option
+
+    """
+
+    def __init__(self, decoder, args, report_cer=False, report_wer=False):
+        """Construct an ErrorCalculator object for transducer model."""
+        super(ErrorCalculatorTrans, self).__init__()
+
+        self.dec = decoder
+
+        recog_args = {'beam_size': args.beam_size,
+                      'nbest': args.nbest,
+                      'space': args.sym_space,
+                      'score_norm_transducer': args.score_norm_transducer}
+
+        self.recog_args = argparse.Namespace(**recog_args)
+
+        self.char_list = args.char_list
+        self.space = args.sym_space
+        self.blank = args.sym_blank
+
+        self.report_cer = args.report_cer
+        self.report_wer = args.report_wer
+
+    def __call__(self, hs_pad, ys_pad):
+        """Calculate sentence-level WER/CER score for transducer models.
+
+        Args:
+            hs_pad (torch.Tensor): batch of padded input sequence (batch, T, D)
+            ys_pad (torch.Tensor): reference (batch, seqlen)
+
+        Returns:
+            (float): sentence-level CER score
+            (float): sentence-level WER score
+
+        """
+        cer, wer = None, None
+
+        if not self.report_cer and not self.report_wer:
+            return cer, wer
+
+        batchsize = int(hs_pad.size(0))
+        batch_nbest = []
+
+        for b in six.moves.range(batchsize):
+            if self.recog_args.beam_size == 1:
+                nbest_hyps = self.dec.recognize(hs_pad[b], self.recog_args)
+            else:
+                nbest_hyps = self.dec.recognize_beam(hs_pad[b], self.recog_args)
+            batch_nbest.append(nbest_hyps)
+
+        ys_hat = [nbest_hyp[0]['yseq'][1:] for nbest_hyp in batch_nbest]
+
+        seqs_hat, seqs_true = self.convert_to_char(ys_hat, ys_pad.cpu())
+
+        if self.report_cer:
+            cer = self.calculate_cer(seqs_hat, seqs_true)
+
+        if self.report_wer:
+            wer = self.calculate_wer(seqs_hat, seqs_true)
+
+        return cer, wer
+
+    def convert_to_char(self, ys_hat, ys_pad):
+        """Convert index to character.
+
+        Args:
+            ys_hat (torch.Tensor): prediction (batch, seqlen)
+            ys_pad (torch.Tensor): reference (batch, seqlen)
+
+        Returns:
+            (list): token list of prediction
+            (list): token list of reference
+
+        """
+        seqs_hat, seqs_true = [], []
+
+        for i, y_hat in enumerate(ys_hat):
+            y_true = ys_pad[i]
+
+            eos_true = np.where(y_true == -1)[0]
+            eos_true = eos_true[0] if len(eos_true) > 0 else len(y_true)
+
+            seq_hat = [self.char_list[int(idx)] for idx in y_hat[:eos_true]]
+            seq_true = [self.char_list[int(idx)] for idx in y_true if int(idx) != -1]
+
+            seq_hat_text = "".join(seq_hat).replace(self.space, ' ')
+            seq_hat_text = seq_hat_text.replace(self.blank, '')
+            seq_true_text = "".join(seq_true).replace(self.space, ' ')
+
+            seqs_hat.append(seq_hat_text)
+            seqs_true.append(seq_true_text)
+
+        return seqs_hat, seqs_true
+
+    def calculate_cer(self, seqs_hat, seqs_true):
+        """Calculate sentence-level CER score for transducer model.
+
+        Args:
+            seqs_hat (torch.Tensor): prediction (batch, seqlen)
+            seqs_true (torch.Tensor): reference (batch, seqlen)
+
+        Returns:
+            (float): average sentence-level CER score
+
+        """
+        char_eds, char_ref_lens = [], []
+
+        for i, seq_hat_text in enumerate(seqs_hat):
+            seq_true_text = seqs_true[i]
+            hyp_chars = seq_hat_text.replace(' ', '')
+            ref_chars = seq_true_text.replace(' ', '')
+
+            char_eds.append(editdistance.eval(hyp_chars, ref_chars))
+            char_ref_lens.append(len(ref_chars))
+
+        return float(sum(char_eds)) / sum(char_ref_lens)
+
+    def calculate_wer(self, seqs_hat, seqs_true):
+        """Calculate sentence-level WER score for transducer model.
+
+        Args:
+            seqs_hat (torch.Tensor): prediction (batch, seqlen)
+            seqs_true (torch.Tensor): reference (batch, seqlen)
+
+        Returns:
+            (float): average sentence-level WER score
+
+        """
+        word_eds, word_ref_lens = [], []
+
+        for i, seq_hat_text in enumerate(seqs_hat):
+            seq_true_text = seqs_true[i]
+            hyp_words = seq_hat_text.split()
+            ref_words = seq_true_text.split()
+
+            word_eds.append(editdistance.eval(hyp_words, ref_words))
+            word_ref_lens.append(len(ref_words))
+
+        return float(sum(word_eds)) / sum(word_ref_lens)

ppg_extractor/encoder/attention.py

@@ -0,0 +1,183 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Shigeki Karita
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Multi-Head Attention layer definition."""
+
+import math
+
+import numpy
+import torch
+from torch import nn
+
+
+class MultiHeadedAttention(nn.Module):
+    """Multi-Head Attention layer.
+
+    :param int n_head: the number of head s
+    :param int n_feat: the number of features
+    :param float dropout_rate: dropout rate
+
+    """
+
+    def __init__(self, n_head, n_feat, dropout_rate):
+        """Construct an MultiHeadedAttention object."""
+        super(MultiHeadedAttention, self).__init__()
+        assert n_feat % n_head == 0
+        # We assume d_v always equals d_k
+        self.d_k = n_feat // n_head
+        self.h = n_head
+        self.linear_q = nn.Linear(n_feat, n_feat)
+        self.linear_k = nn.Linear(n_feat, n_feat)
+        self.linear_v = nn.Linear(n_feat, n_feat)
+        self.linear_out = nn.Linear(n_feat, n_feat)
+        self.attn = None
+        self.dropout = nn.Dropout(p=dropout_rate)
+
+    def forward_qkv(self, query, key, value):
+        """Transform query, key and value.
+
+        :param torch.Tensor query: (batch, time1, size)
+        :param torch.Tensor key: (batch, time2, size)
+        :param torch.Tensor value: (batch, time2, size)
+        :return torch.Tensor transformed query, key and value
+
+        """
+        n_batch = query.size(0)
+        q = self.linear_q(query).view(n_batch, -1, self.h, self.d_k)
+        k = self.linear_k(key).view(n_batch, -1, self.h, self.d_k)
+        v = self.linear_v(value).view(n_batch, -1, self.h, self.d_k)
+        q = q.transpose(1, 2)  # (batch, head, time1, d_k)
+        k = k.transpose(1, 2)  # (batch, head, time2, d_k)
+        v = v.transpose(1, 2)  # (batch, head, time2, d_k)
+
+        return q, k, v
+
+    def forward_attention(self, value, scores, mask):
+        """Compute attention context vector.
+
+        :param torch.Tensor value: (batch, head, time2, size)
+        :param torch.Tensor scores: (batch, head, time1, time2)
+        :param torch.Tensor mask: (batch, 1, time2) or (batch, time1, time2)
+        :return torch.Tensor transformed `value` (batch, time1, d_model)
+            weighted by the attention score (batch, time1, time2)
+
+        """
+        n_batch = value.size(0)
+        if mask is not None:
+            mask = mask.unsqueeze(1).eq(0)  # (batch, 1, *, time2)
+            min_value = float(
+                numpy.finfo(torch.tensor(0, dtype=scores.dtype).numpy().dtype).min
+            )
+            scores = scores.masked_fill(mask, min_value)
+            self.attn = torch.softmax(scores, dim=-1).masked_fill(
+                mask, 0.0
+            )  # (batch, head, time1, time2)
+        else:
+            self.attn = torch.softmax(scores, dim=-1)  # (batch, head, time1, time2)
+
+        p_attn = self.dropout(self.attn)
+        x = torch.matmul(p_attn, value)  # (batch, head, time1, d_k)
+        x = (
+            x.transpose(1, 2).contiguous().view(n_batch, -1, self.h * self.d_k)
+        )  # (batch, time1, d_model)
+
+        return self.linear_out(x)  # (batch, time1, d_model)
+
+    def forward(self, query, key, value, mask):
+        """Compute 'Scaled Dot Product Attention'.
+
+        :param torch.Tensor query: (batch, time1, size)
+        :param torch.Tensor key: (batch, time2, size)
+        :param torch.Tensor value: (batch, time2, size)
+        :param torch.Tensor mask: (batch, 1, time2) or (batch, time1, time2)
+        :param torch.nn.Dropout dropout:
+        :return torch.Tensor: attention output (batch, time1, d_model)
+        """
+        q, k, v = self.forward_qkv(query, key, value)
+        scores = torch.matmul(q, k.transpose(-2, -1)) / math.sqrt(self.d_k)
+        return self.forward_attention(v, scores, mask)
+
+
+class RelPositionMultiHeadedAttention(MultiHeadedAttention):
+    """Multi-Head Attention layer with relative position encoding.
+
+    Paper: https://arxiv.org/abs/1901.02860
+
+    :param int n_head: the number of head s
+    :param int n_feat: the number of features
+    :param float dropout_rate: dropout rate
+
+    """
+
+    def __init__(self, n_head, n_feat, dropout_rate):
+        """Construct an RelPositionMultiHeadedAttention object."""
+        super().__init__(n_head, n_feat, dropout_rate)
+        # linear transformation for positional ecoding
+        self.linear_pos = nn.Linear(n_feat, n_feat, bias=False)
+        # these two learnable bias are used in matrix c and matrix d
+        # as described in https://arxiv.org/abs/1901.02860 Section 3.3
+        self.pos_bias_u = nn.Parameter(torch.Tensor(self.h, self.d_k))
+        self.pos_bias_v = nn.Parameter(torch.Tensor(self.h, self.d_k))
+        torch.nn.init.xavier_uniform_(self.pos_bias_u)
+        torch.nn.init.xavier_uniform_(self.pos_bias_v)
+
+    def rel_shift(self, x, zero_triu=False):
+        """Compute relative positinal encoding.
+
+        :param torch.Tensor x: (batch, time, size)
+        :param bool zero_triu: return the lower triangular part of the matrix
+        """
+        zero_pad = torch.zeros((*x.size()[:3], 1), device=x.device, dtype=x.dtype)
+        x_padded = torch.cat([zero_pad, x], dim=-1)
+
+        x_padded = x_padded.view(*x.size()[:2], x.size(3) + 1, x.size(2))
+        x = x_padded[:, :, 1:].view_as(x)
+
+        if zero_triu:
+            ones = torch.ones((x.size(2), x.size(3)))
+            x = x * torch.tril(ones, x.size(3) - x.size(2))[None, None, :, :]
+
+        return x
+
+    def forward(self, query, key, value, pos_emb, mask):
+        """Compute 'Scaled Dot Product Attention' with rel. positional encoding.
+
+        :param torch.Tensor query: (batch, time1, size)
+        :param torch.Tensor key: (batch, time2, size)
+        :param torch.Tensor value: (batch, time2, size)
+        :param torch.Tensor pos_emb: (batch, time1, size)
+        :param torch.Tensor mask: (batch, time1, time2)
+        :param torch.nn.Dropout dropout:
+        :return torch.Tensor: attention output  (batch, time1, d_model)
+        """
+        q, k, v = self.forward_qkv(query, key, value)
+        q = q.transpose(1, 2)  # (batch, time1, head, d_k)
+
+        n_batch_pos = pos_emb.size(0)
+        p = self.linear_pos(pos_emb).view(n_batch_pos, -1, self.h, self.d_k)
+        p = p.transpose(1, 2)  # (batch, head, time1, d_k)
+
+        # (batch, head, time1, d_k)
+        q_with_bias_u = (q + self.pos_bias_u).transpose(1, 2)
+        # (batch, head, time1, d_k)
+        q_with_bias_v = (q + self.pos_bias_v).transpose(1, 2)
+
+        # compute attention score
+        # first compute matrix a and matrix c
+        # as described in https://arxiv.org/abs/1901.02860 Section 3.3
+        # (batch, head, time1, time2)
+        matrix_ac = torch.matmul(q_with_bias_u, k.transpose(-2, -1))
+
+        # compute matrix b and matrix d
+        # (batch, head, time1, time2)
+        matrix_bd = torch.matmul(q_with_bias_v, p.transpose(-2, -1))
+        matrix_bd = self.rel_shift(matrix_bd)
+
+        scores = (matrix_ac + matrix_bd) / math.sqrt(
+            self.d_k
+        )  # (batch, head, time1, time2)
+
+        return self.forward_attention(v, scores, mask)

ppg_extractor/encoder/conformer_encoder.py

@@ -0,0 +1,262 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Shigeki Karita
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Encoder definition."""
+
+import logging
+import torch
+from typing import Callable
+from typing import Collection
+from typing import Dict
+from typing import List
+from typing import Optional
+from typing import Tuple
+
+from .convolution import ConvolutionModule
+from .encoder_layer import EncoderLayer
+from ..nets_utils import get_activation, make_pad_mask
+from .vgg import VGG2L
+from .attention import MultiHeadedAttention, RelPositionMultiHeadedAttention
+from .embedding import PositionalEncoding, ScaledPositionalEncoding, RelPositionalEncoding
+from .layer_norm import LayerNorm
+from .multi_layer_conv import Conv1dLinear, MultiLayeredConv1d
+from .positionwise_feed_forward import PositionwiseFeedForward
+from .repeat import repeat
+from .subsampling import Conv2dNoSubsampling, Conv2dSubsampling
+
+
+class ConformerEncoder(torch.nn.Module):
+    """Conformer encoder module.
+
+    :param int idim: input dim
+    :param int attention_dim: dimention of attention
+    :param int attention_heads: the number of heads of multi head attention
+    :param int linear_units: the number of units of position-wise feed forward
+    :param int num_blocks: the number of decoder blocks
+    :param float dropout_rate: dropout rate
+    :param float attention_dropout_rate: dropout rate in attention
+    :param float positional_dropout_rate: dropout rate after adding positional encoding
+    :param str or torch.nn.Module input_layer: input layer type
+    :param bool normalize_before: whether to use layer_norm before the first block
+    :param bool concat_after: whether to concat attention layer's input and output
+        if True, additional linear will be applied.
+        i.e. x -> x + linear(concat(x, att(x)))
+        if False, no additional linear will be applied. i.e. x -> x + att(x)
+    :param str positionwise_layer_type: linear of conv1d
+    :param int positionwise_conv_kernel_size: kernel size of positionwise conv1d layer
+    :param str encoder_pos_enc_layer_type: encoder positional encoding layer type
+    :param str encoder_attn_layer_type: encoder attention layer type
+    :param str activation_type: encoder activation function type
+    :param bool macaron_style: whether to use macaron style for positionwise layer
+    :param bool use_cnn_module: whether to use convolution module
+    :param int cnn_module_kernel: kernerl size of convolution module
+    :param int padding_idx: padding_idx for input_layer=embed
+    """
+
+    def __init__(
+        self,
+        input_size,
+        attention_dim=256,
+        attention_heads=4,
+        linear_units=2048,
+        num_blocks=6,
+        dropout_rate=0.1,
+        positional_dropout_rate=0.1,
+        attention_dropout_rate=0.0,
+        input_layer="conv2d",
+        normalize_before=True,
+        concat_after=False,
+        positionwise_layer_type="linear",
+        positionwise_conv_kernel_size=1,
+        macaron_style=False,
+        pos_enc_layer_type="abs_pos",
+        selfattention_layer_type="selfattn",
+        activation_type="swish",
+        use_cnn_module=False,
+        cnn_module_kernel=31,
+        padding_idx=-1,
+        no_subsample=False,
+        subsample_by_2=False,
+    ):
+        """Construct an Encoder object."""
+        super().__init__()
+        
+        self._output_size = attention_dim
+        idim = input_size
+
+        activation = get_activation(activation_type)
+        if pos_enc_layer_type == "abs_pos":
+            pos_enc_class = PositionalEncoding
+        elif pos_enc_layer_type == "scaled_abs_pos":
+            pos_enc_class = ScaledPositionalEncoding
+        elif pos_enc_layer_type == "rel_pos":
+            assert selfattention_layer_type == "rel_selfattn"
+            pos_enc_class = RelPositionalEncoding
+        else:
+            raise ValueError("unknown pos_enc_layer: " + pos_enc_layer_type)
+
+        if input_layer == "linear":
+            self.embed = torch.nn.Sequential(
+                torch.nn.Linear(idim, attention_dim),
+                torch.nn.LayerNorm(attention_dim),
+                torch.nn.Dropout(dropout_rate),
+                pos_enc_class(attention_dim, positional_dropout_rate),
+            )
+        elif input_layer == "conv2d":
+            logging.info("Encoder input layer type: conv2d")
+            if no_subsample:
+                self.embed = Conv2dNoSubsampling(
+                    idim,
+                    attention_dim,
+                    dropout_rate,
+                    pos_enc_class(attention_dim, positional_dropout_rate),
+                )
+            else:
+                self.embed = Conv2dSubsampling(
+                    idim,
+                    attention_dim,
+                    dropout_rate,
+                    pos_enc_class(attention_dim, positional_dropout_rate),
+                    subsample_by_2,  # NOTE(Sx): added by songxiang
+                )
+        elif input_layer == "vgg2l":
+            self.embed = VGG2L(idim, attention_dim)
+        elif input_layer == "embed":
+            self.embed = torch.nn.Sequential(
+                torch.nn.Embedding(idim, attention_dim, padding_idx=padding_idx),
+                pos_enc_class(attention_dim, positional_dropout_rate),
+            )
+        elif isinstance(input_layer, torch.nn.Module):
+            self.embed = torch.nn.Sequential(
+                input_layer,
+                pos_enc_class(attention_dim, positional_dropout_rate),
+            )
+        elif input_layer is None:
+            self.embed = torch.nn.Sequential(
+                pos_enc_class(attention_dim, positional_dropout_rate)
+            )
+        else:
+            raise ValueError("unknown input_layer: " + input_layer)
+        self.normalize_before = normalize_before
+        if positionwise_layer_type == "linear":
+            positionwise_layer = PositionwiseFeedForward
+            positionwise_layer_args = (
+                attention_dim,
+                linear_units,
+                dropout_rate,
+                activation,
+            )
+        elif positionwise_layer_type == "conv1d":
+            positionwise_layer = MultiLayeredConv1d
+            positionwise_layer_args = (
+                attention_dim,
+                linear_units,
+                positionwise_conv_kernel_size,
+                dropout_rate,
+            )
+        elif positionwise_layer_type == "conv1d-linear":
+            positionwise_layer = Conv1dLinear
+            positionwise_layer_args = (
+                attention_dim,
+                linear_units,
+                positionwise_conv_kernel_size,
+                dropout_rate,
+            )
+        else:
+            raise NotImplementedError("Support only linear or conv1d.")
+
+        if selfattention_layer_type == "selfattn":
+            logging.info("encoder self-attention layer type = self-attention")
+            encoder_selfattn_layer = MultiHeadedAttention
+            encoder_selfattn_layer_args = (
+                attention_heads,
+                attention_dim,
+                attention_dropout_rate,
+            )
+        elif selfattention_layer_type == "rel_selfattn":
+            assert pos_enc_layer_type == "rel_pos"
+            encoder_selfattn_layer = RelPositionMultiHeadedAttention
+            encoder_selfattn_layer_args = (
+                attention_heads,
+                attention_dim,
+                attention_dropout_rate,
+            )
+        else:
+            raise ValueError("unknown encoder_attn_layer: " + selfattention_layer_type)
+
+        convolution_layer = ConvolutionModule
+        convolution_layer_args = (attention_dim, cnn_module_kernel, activation)
+
+        self.encoders = repeat(
+            num_blocks,
+            lambda lnum: EncoderLayer(
+                attention_dim,
+                encoder_selfattn_layer(*encoder_selfattn_layer_args),
+                positionwise_layer(*positionwise_layer_args),
+                positionwise_layer(*positionwise_layer_args) if macaron_style else None,
+                convolution_layer(*convolution_layer_args) if use_cnn_module else None,
+                dropout_rate,
+                normalize_before,
+                concat_after,
+            ),
+        )
+        if self.normalize_before:
+            self.after_norm = LayerNorm(attention_dim)
+    
+    def output_size(self) -> int:
+        return self._output_size 
+    
+    def forward(
+        self,
+        xs_pad: torch.Tensor,
+        ilens: torch.Tensor,
+        prev_states: torch.Tensor = None,
+    ) -> Tuple[torch.Tensor, torch.Tensor, Optional[torch.Tensor]]:
+        """
+        Args:
+            xs_pad: input tensor (B, L, D)
+            ilens: input lengths (B)
+            prev_states: Not to be used now.
+        Returns:
+            Position embedded tensor and mask
+        """
+        masks = (~make_pad_mask(ilens)[:, None, :]).to(xs_pad.device)
+
+        if isinstance(self.embed, (Conv2dSubsampling, Conv2dNoSubsampling, VGG2L)):
+            # print(xs_pad.shape)
+            xs_pad, masks = self.embed(xs_pad, masks)
+            # print(xs_pad[0].size())
+        else:
+            xs_pad = self.embed(xs_pad)
+        xs_pad, masks = self.encoders(xs_pad, masks)
+        if isinstance(xs_pad, tuple):
+            xs_pad = xs_pad[0]
+
+        if self.normalize_before:
+            xs_pad = self.after_norm(xs_pad)
+        olens = masks.squeeze(1).sum(1)
+        return xs_pad, olens, None
+    
+    # def forward(self, xs, masks):
+        # """Encode input sequence.
+
+        # :param torch.Tensor xs: input tensor
+        # :param torch.Tensor masks: input mask
+        # :return: position embedded tensor and mask
+        # :rtype Tuple[torch.Tensor, torch.Tensor]:
+        # """
+        # if isinstance(self.embed, (Conv2dSubsampling, VGG2L)):
+            # xs, masks = self.embed(xs, masks)
+        # else:
+            # xs = self.embed(xs)
+
+        # xs, masks = self.encoders(xs, masks)
+        # if isinstance(xs, tuple):
+            # xs = xs[0]
+
+        # if self.normalize_before:
+            # xs = self.after_norm(xs)
+        # return xs, masks

ppg_extractor/encoder/convolution.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2020 Johns Hopkins University (Shinji Watanabe)
+#                Northwestern Polytechnical University (Pengcheng Guo)
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""ConvolutionModule definition."""
+
+from torch import nn
+
+
+class ConvolutionModule(nn.Module):
+    """ConvolutionModule in Conformer model.
+
+    :param int channels: channels of cnn
+    :param int kernel_size: kernerl size of cnn
+
+    """
+
+    def __init__(self, channels, kernel_size, activation=nn.ReLU(), bias=True):
+        """Construct an ConvolutionModule object."""
+        super(ConvolutionModule, self).__init__()
+        # kernerl_size should be a odd number for 'SAME' padding
+        assert (kernel_size - 1) % 2 == 0
+
+        self.pointwise_conv1 = nn.Conv1d(
+            channels,
+            2 * channels,
+            kernel_size=1,
+            stride=1,
+            padding=0,
+            bias=bias,
+        )
+        self.depthwise_conv = nn.Conv1d(
+            channels,
+            channels,
+            kernel_size,
+            stride=1,
+            padding=(kernel_size - 1) // 2,
+            groups=channels,
+            bias=bias,
+        )
+        self.norm = nn.BatchNorm1d(channels)
+        self.pointwise_conv2 = nn.Conv1d(
+            channels,
+            channels,
+            kernel_size=1,
+            stride=1,
+            padding=0,
+            bias=bias,
+        )
+        self.activation = activation
+
+    def forward(self, x):
+        """Compute convolution module.
+
+        :param torch.Tensor x: (batch, time, size)
+        :return torch.Tensor: convoluted `value` (batch, time, d_model)
+        """
+        # exchange the temporal dimension and the feature dimension
+        x = x.transpose(1, 2)
+
+        # GLU mechanism
+        x = self.pointwise_conv1(x)  # (batch, 2*channel, dim)
+        x = nn.functional.glu(x, dim=1)  # (batch, channel, dim)
+
+        # 1D Depthwise Conv
+        x = self.depthwise_conv(x)
+        x = self.activation(self.norm(x))
+
+        x = self.pointwise_conv2(x)
+
+        return x.transpose(1, 2)

ppg_extractor/encoder/embedding.py

@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Shigeki Karita
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Positonal Encoding Module."""
+
+import math
+
+import torch
+
+
+def _pre_hook(
+    state_dict,
+    prefix,
+    local_metadata,
+    strict,
+    missing_keys,
+    unexpected_keys,
+    error_msgs,
+):
+    """Perform pre-hook in load_state_dict for backward compatibility.
+
+    Note:
+        We saved self.pe until v.0.5.2 but we have omitted it later.
+        Therefore, we remove the item "pe" from `state_dict` for backward compatibility.
+
+    """
+    k = prefix + "pe"
+    if k in state_dict:
+        state_dict.pop(k)
+
+
+class PositionalEncoding(torch.nn.Module):
+    """Positional encoding.
+
+    :param int d_model: embedding dim
+    :param float dropout_rate: dropout rate
+    :param int max_len: maximum input length
+    :param reverse: whether to reverse the input position
+
+    """
+
+    def __init__(self, d_model, dropout_rate, max_len=5000, reverse=False):
+        """Construct an PositionalEncoding object."""
+        super(PositionalEncoding, self).__init__()
+        self.d_model = d_model
+        self.reverse = reverse
+        self.xscale = math.sqrt(self.d_model)
+        self.dropout = torch.nn.Dropout(p=dropout_rate)
+        self.pe = None
+        self.extend_pe(torch.tensor(0.0).expand(1, max_len))
+        self._register_load_state_dict_pre_hook(_pre_hook)
+
+    def extend_pe(self, x):
+        """Reset the positional encodings."""
+        if self.pe is not None:
+            if self.pe.size(1) >= x.size(1):
+                if self.pe.dtype != x.dtype or self.pe.device != x.device:
+                    self.pe = self.pe.to(dtype=x.dtype, device=x.device)
+                return
+        pe = torch.zeros(x.size(1), self.d_model)
+        if self.reverse:
+            position = torch.arange(
+                x.size(1) - 1, -1, -1.0, dtype=torch.float32
+            ).unsqueeze(1)
+        else:
+            position = torch.arange(0, x.size(1), dtype=torch.float32).unsqueeze(1)
+        div_term = torch.exp(
+            torch.arange(0, self.d_model, 2, dtype=torch.float32)
+            * -(math.log(10000.0) / self.d_model)
+        )
+        pe[:, 0::2] = torch.sin(position * div_term)
+        pe[:, 1::2] = torch.cos(position * div_term)
+        pe = pe.unsqueeze(0)
+        self.pe = pe.to(device=x.device, dtype=x.dtype)
+
+    def forward(self, x: torch.Tensor):
+        """Add positional encoding.
+
+        Args:
+            x (torch.Tensor): Input. Its shape is (batch, time, ...)
+
+        Returns:
+            torch.Tensor: Encoded tensor. Its shape is (batch, time, ...)
+
+        """
+        self.extend_pe(x)
+        x = x * self.xscale + self.pe[:, : x.size(1)]
+        return self.dropout(x)
+
+
+class ScaledPositionalEncoding(PositionalEncoding):
+    """Scaled positional encoding module.
+
+    See also: Sec. 3.2  https://arxiv.org/pdf/1809.08895.pdf
+
+    """
+
+    def __init__(self, d_model, dropout_rate, max_len=5000):
+        """Initialize class.
+
+        :param int d_model: embedding dim
+        :param float dropout_rate: dropout rate
+        :param int max_len: maximum input length
+
+        """
+        super().__init__(d_model=d_model, dropout_rate=dropout_rate, max_len=max_len)
+        self.alpha = torch.nn.Parameter(torch.tensor(1.0))
+
+    def reset_parameters(self):
+        """Reset parameters."""
+        self.alpha.data = torch.tensor(1.0)
+
+    def forward(self, x):
+        """Add positional encoding.
+
+        Args:
+            x (torch.Tensor): Input. Its shape is (batch, time, ...)
+
+        Returns:
+            torch.Tensor: Encoded tensor. Its shape is (batch, time, ...)
+
+        """
+        self.extend_pe(x)
+        x = x + self.alpha * self.pe[:, : x.size(1)]
+        return self.dropout(x)
+
+
+class RelPositionalEncoding(PositionalEncoding):
+    """Relitive positional encoding module.
+
+    See : Appendix B in https://arxiv.org/abs/1901.02860
+
+    :param int d_model: embedding dim
+    :param float dropout_rate: dropout rate
+    :param int max_len: maximum input length
+
+    """
+
+    def __init__(self, d_model, dropout_rate, max_len=5000):
+        """Initialize class.
+
+        :param int d_model: embedding dim
+        :param float dropout_rate: dropout rate
+        :param int max_len: maximum input length
+
+        """
+        super().__init__(d_model, dropout_rate, max_len, reverse=True)
+
+    def forward(self, x):
+        """Compute positional encoding.
+
+        Args:
+            x (torch.Tensor): Input. Its shape is (batch, time, ...)
+
+        Returns:
+            torch.Tensor: x. Its shape is (batch, time, ...)
+            torch.Tensor: pos_emb. Its shape is (1, time, ...)
+
+        """
+        self.extend_pe(x)
+        x = x * self.xscale
+        pos_emb = self.pe[:, : x.size(1)]
+        return self.dropout(x), self.dropout(pos_emb)

ppg_extractor/encoder/encoder.py

@@ -0,0 +1,217 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Shigeki Karita
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Encoder definition."""
+
+import logging
+import torch
+
+from espnet.nets.pytorch_backend.conformer.convolution import ConvolutionModule
+from espnet.nets.pytorch_backend.conformer.encoder_layer import EncoderLayer
+from espnet.nets.pytorch_backend.nets_utils import get_activation
+from espnet.nets.pytorch_backend.transducer.vgg import VGG2L
+from espnet.nets.pytorch_backend.transformer.attention import (
+    MultiHeadedAttention,  # noqa: H301
+    RelPositionMultiHeadedAttention,  # noqa: H301
+)
+from espnet.nets.pytorch_backend.transformer.embedding import (
+    PositionalEncoding,  # noqa: H301
+    ScaledPositionalEncoding,  # noqa: H301
+    RelPositionalEncoding,  # noqa: H301
+)
+from espnet.nets.pytorch_backend.transformer.layer_norm import LayerNorm
+from espnet.nets.pytorch_backend.transformer.multi_layer_conv import Conv1dLinear
+from espnet.nets.pytorch_backend.transformer.multi_layer_conv import MultiLayeredConv1d
+from espnet.nets.pytorch_backend.transformer.positionwise_feed_forward import (
+    PositionwiseFeedForward,  # noqa: H301
+)
+from espnet.nets.pytorch_backend.transformer.repeat import repeat
+from espnet.nets.pytorch_backend.transformer.subsampling import Conv2dSubsampling
+
+
+class Encoder(torch.nn.Module):
+    """Conformer encoder module.
+
+    :param int idim: input dim
+    :param int attention_dim: dimention of attention
+    :param int attention_heads: the number of heads of multi head attention
+    :param int linear_units: the number of units of position-wise feed forward
+    :param int num_blocks: the number of decoder blocks
+    :param float dropout_rate: dropout rate
+    :param float attention_dropout_rate: dropout rate in attention
+    :param float positional_dropout_rate: dropout rate after adding positional encoding
+    :param str or torch.nn.Module input_layer: input layer type
+    :param bool normalize_before: whether to use layer_norm before the first block
+    :param bool concat_after: whether to concat attention layer's input and output
+        if True, additional linear will be applied.
+        i.e. x -> x + linear(concat(x, att(x)))
+        if False, no additional linear will be applied. i.e. x -> x + att(x)
+    :param str positionwise_layer_type: linear of conv1d
+    :param int positionwise_conv_kernel_size: kernel size of positionwise conv1d layer
+    :param str encoder_pos_enc_layer_type: encoder positional encoding layer type
+    :param str encoder_attn_layer_type: encoder attention layer type
+    :param str activation_type: encoder activation function type
+    :param bool macaron_style: whether to use macaron style for positionwise layer
+    :param bool use_cnn_module: whether to use convolution module
+    :param int cnn_module_kernel: kernerl size of convolution module
+    :param int padding_idx: padding_idx for input_layer=embed
+    """
+
+    def __init__(
+        self,
+        idim,
+        attention_dim=256,
+        attention_heads=4,
+        linear_units=2048,
+        num_blocks=6,
+        dropout_rate=0.1,
+        positional_dropout_rate=0.1,
+        attention_dropout_rate=0.0,
+        input_layer="conv2d",
+        normalize_before=True,
+        concat_after=False,
+        positionwise_layer_type="linear",
+        positionwise_conv_kernel_size=1,
+        macaron_style=False,
+        pos_enc_layer_type="abs_pos",
+        selfattention_layer_type="selfattn",
+        activation_type="swish",
+        use_cnn_module=False,
+        cnn_module_kernel=31,
+        padding_idx=-1,
+    ):
+        """Construct an Encoder object."""
+        super(Encoder, self).__init__()
+
+        activation = get_activation(activation_type)
+        if pos_enc_layer_type == "abs_pos":
+            pos_enc_class = PositionalEncoding
+        elif pos_enc_layer_type == "scaled_abs_pos":
+            pos_enc_class = ScaledPositionalEncoding
+        elif pos_enc_layer_type == "rel_pos":
+            assert selfattention_layer_type == "rel_selfattn"
+            pos_enc_class = RelPositionalEncoding
+        else:
+            raise ValueError("unknown pos_enc_layer: " + pos_enc_layer_type)
+
+        if input_layer == "linear":
+            self.embed = torch.nn.Sequential(
+                torch.nn.Linear(idim, attention_dim),
+                torch.nn.LayerNorm(attention_dim),
+                torch.nn.Dropout(dropout_rate),
+                pos_enc_class(attention_dim, positional_dropout_rate),
+            )
+        elif input_layer == "conv2d":
+            self.embed = Conv2dSubsampling(
+                idim,
+                attention_dim,
+                dropout_rate,
+                pos_enc_class(attention_dim, positional_dropout_rate),
+            )
+        elif input_layer == "vgg2l":
+            self.embed = VGG2L(idim, attention_dim)
+        elif input_layer == "embed":
+            self.embed = torch.nn.Sequential(
+                torch.nn.Embedding(idim, attention_dim, padding_idx=padding_idx),
+                pos_enc_class(attention_dim, positional_dropout_rate),
+            )
+        elif isinstance(input_layer, torch.nn.Module):
+            self.embed = torch.nn.Sequential(
+                input_layer,
+                pos_enc_class(attention_dim, positional_dropout_rate),
+            )
+        elif input_layer is None:
+            self.embed = torch.nn.Sequential(
+                pos_enc_class(attention_dim, positional_dropout_rate)
+            )
+        else:
+            raise ValueError("unknown input_layer: " + input_layer)
+        self.normalize_before = normalize_before
+        if positionwise_layer_type == "linear":
+            positionwise_layer = PositionwiseFeedForward
+            positionwise_layer_args = (
+                attention_dim,
+                linear_units,
+                dropout_rate,
+                activation,
+            )
+        elif positionwise_layer_type == "conv1d":
+            positionwise_layer = MultiLayeredConv1d
+            positionwise_layer_args = (
+                attention_dim,
+                linear_units,
+                positionwise_conv_kernel_size,
+                dropout_rate,
+            )
+        elif positionwise_layer_type == "conv1d-linear":
+            positionwise_layer = Conv1dLinear
+            positionwise_layer_args = (
+                attention_dim,
+                linear_units,
+                positionwise_conv_kernel_size,
+                dropout_rate,
+            )
+        else:
+            raise NotImplementedError("Support only linear or conv1d.")
+
+        if selfattention_layer_type == "selfattn":
+            logging.info("encoder self-attention layer type = self-attention")
+            encoder_selfattn_layer = MultiHeadedAttention
+            encoder_selfattn_layer_args = (
+                attention_heads,
+                attention_dim,
+                attention_dropout_rate,
+            )
+        elif selfattention_layer_type == "rel_selfattn":
+            assert pos_enc_layer_type == "rel_pos"
+            encoder_selfattn_layer = RelPositionMultiHeadedAttention
+            encoder_selfattn_layer_args = (
+                attention_heads,
+                attention_dim,
+                attention_dropout_rate,
+            )
+        else:
+            raise ValueError("unknown encoder_attn_layer: " + selfattention_layer_type)
+
+        convolution_layer = ConvolutionModule
+        convolution_layer_args = (attention_dim, cnn_module_kernel, activation)
+
+        self.encoders = repeat(
+            num_blocks,
+            lambda lnum: EncoderLayer(
+                attention_dim,
+                encoder_selfattn_layer(*encoder_selfattn_layer_args),
+                positionwise_layer(*positionwise_layer_args),
+                positionwise_layer(*positionwise_layer_args) if macaron_style else None,
+                convolution_layer(*convolution_layer_args) if use_cnn_module else None,
+                dropout_rate,
+                normalize_before,
+                concat_after,
+            ),
+        )
+        if self.normalize_before:
+            self.after_norm = LayerNorm(attention_dim)
+
+    def forward(self, xs, masks):
+        """Encode input sequence.
+
+        :param torch.Tensor xs: input tensor
+        :param torch.Tensor masks: input mask
+        :return: position embedded tensor and mask
+        :rtype Tuple[torch.Tensor, torch.Tensor]:
+        """
+        if isinstance(self.embed, (Conv2dSubsampling, VGG2L)):
+            xs, masks = self.embed(xs, masks)
+        else:
+            xs = self.embed(xs)
+
+        xs, masks = self.encoders(xs, masks)
+        if isinstance(xs, tuple):
+            xs = xs[0]
+
+        if self.normalize_before:
+            xs = self.after_norm(xs)
+        return xs, masks

ppg_extractor/encoder/encoder_layer.py

@@ -0,0 +1,152 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2020 Johns Hopkins University (Shinji Watanabe)
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Encoder self-attention layer definition."""
+
+import torch
+
+from torch import nn
+
+from .layer_norm import LayerNorm
+
+
+class EncoderLayer(nn.Module):
+    """Encoder layer module.
+
+    :param int size: input dim
+    :param espnet.nets.pytorch_backend.transformer.attention.
+        MultiHeadedAttention self_attn: self attention module
+        RelPositionMultiHeadedAttention self_attn: self attention module
+    :param espnet.nets.pytorch_backend.transformer.positionwise_feed_forward.
+        PositionwiseFeedForward feed_forward:
+        feed forward module
+    :param espnet.nets.pytorch_backend.transformer.positionwise_feed_forward
+    for macaron style
+    PositionwiseFeedForward feed_forward:
+    feed forward module
+    :param espnet.nets.pytorch_backend.conformer.convolution.
+        ConvolutionModule feed_foreard:
+        feed forward module
+    :param float dropout_rate: dropout rate
+    :param bool normalize_before: whether to use layer_norm before the first block
+    :param bool concat_after: whether to concat attention layer's input and output
+        if True, additional linear will be applied.
+        i.e. x -> x + linear(concat(x, att(x)))
+        if False, no additional linear will be applied. i.e. x -> x + att(x)
+
+    """
+
+    def __init__(
+        self,
+        size,
+        self_attn,
+        feed_forward,
+        feed_forward_macaron,
+        conv_module,
+        dropout_rate,
+        normalize_before=True,
+        concat_after=False,
+    ):
+        """Construct an EncoderLayer object."""
+        super(EncoderLayer, self).__init__()
+        self.self_attn = self_attn
+        self.feed_forward = feed_forward
+        self.feed_forward_macaron = feed_forward_macaron
+        self.conv_module = conv_module
+        self.norm_ff = LayerNorm(size)  # for the FNN module
+        self.norm_mha = LayerNorm(size)  # for the MHA module
+        if feed_forward_macaron is not None:
+            self.norm_ff_macaron = LayerNorm(size)
+            self.ff_scale = 0.5
+        else:
+            self.ff_scale = 1.0
+        if self.conv_module is not None:
+            self.norm_conv = LayerNorm(size)  # for the CNN module
+            self.norm_final = LayerNorm(size)  # for the final output of the block
+        self.dropout = nn.Dropout(dropout_rate)
+        self.size = size
+        self.normalize_before = normalize_before
+        self.concat_after = concat_after
+        if self.concat_after:
+            self.concat_linear = nn.Linear(size + size, size)
+
+    def forward(self, x_input, mask, cache=None):
+        """Compute encoded features.
+
+        :param torch.Tensor x_input: encoded source features, w/o pos_emb
+        tuple((batch, max_time_in, size), (1, max_time_in, size))
+        or (batch, max_time_in, size)
+        :param torch.Tensor mask: mask for x (batch, max_time_in)
+        :param torch.Tensor cache: cache for x (batch, max_time_in - 1, size)
+        :rtype: Tuple[torch.Tensor, torch.Tensor]
+        """
+        if isinstance(x_input, tuple):
+            x, pos_emb = x_input[0], x_input[1]
+        else:
+            x, pos_emb = x_input, None
+
+        # whether to use macaron style
+        if self.feed_forward_macaron is not None:
+            residual = x
+            if self.normalize_before:
+                x = self.norm_ff_macaron(x)
+            x = residual + self.ff_scale * self.dropout(self.feed_forward_macaron(x))
+            if not self.normalize_before:
+                x = self.norm_ff_macaron(x)
+
+        # multi-headed self-attention module
+        residual = x
+        if self.normalize_before:
+            x = self.norm_mha(x)
+
+        if cache is None:
+            x_q = x
+        else:
+            assert cache.shape == (x.shape[0], x.shape[1] - 1, self.size)
+            x_q = x[:, -1:, :]
+            residual = residual[:, -1:, :]
+            mask = None if mask is None else mask[:, -1:, :]
+
+        if pos_emb is not None:
+            x_att = self.self_attn(x_q, x, x, pos_emb, mask)
+        else:
+            x_att = self.self_attn(x_q, x, x, mask)
+
+        if self.concat_after:
+            x_concat = torch.cat((x, x_att), dim=-1)
+            x = residual + self.concat_linear(x_concat)
+        else:
+            x = residual + self.dropout(x_att)
+        if not self.normalize_before:
+            x = self.norm_mha(x)
+
+        # convolution module
+        if self.conv_module is not None:
+            residual = x
+            if self.normalize_before:
+                x = self.norm_conv(x)
+            x = residual + self.dropout(self.conv_module(x))
+            if not self.normalize_before:
+                x = self.norm_conv(x)
+
+        # feed forward module
+        residual = x
+        if self.normalize_before:
+            x = self.norm_ff(x)
+        x = residual + self.ff_scale * self.dropout(self.feed_forward(x))
+        if not self.normalize_before:
+            x = self.norm_ff(x)
+
+        if self.conv_module is not None:
+            x = self.norm_final(x)
+
+        if cache is not None:
+            x = torch.cat([cache, x], dim=1)
+
+        if pos_emb is not None:
+            return (x, pos_emb), mask
+
+        return x, mask

ppg_extractor/encoder/layer_norm.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Shigeki Karita
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Layer normalization module."""
+
+import torch
+
+
+class LayerNorm(torch.nn.LayerNorm):
+    """Layer normalization module.
+
+    :param int nout: output dim size
+    :param int dim: dimension to be normalized
+    """
+
+    def __init__(self, nout, dim=-1):
+        """Construct an LayerNorm object."""
+        super(LayerNorm, self).__init__(nout, eps=1e-12)
+        self.dim = dim
+
+    def forward(self, x):
+        """Apply layer normalization.
+
+        :param torch.Tensor x: input tensor
+        :return: layer normalized tensor
+        :rtype torch.Tensor
+        """
+        if self.dim == -1:
+            return super(LayerNorm, self).forward(x)
+        return super(LayerNorm, self).forward(x.transpose(1, -1)).transpose(1, -1)

ppg_extractor/encoder/multi_layer_conv.py

@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Tomoki Hayashi
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Layer modules for FFT block in FastSpeech (Feed-forward Transformer)."""
+
+import torch
+
+
+class MultiLayeredConv1d(torch.nn.Module):
+    """Multi-layered conv1d for Transformer block.
+
+    This is a module of multi-leyered conv1d designed
+    to replace positionwise feed-forward network
+    in Transforner block, which is introduced in
+    `FastSpeech: Fast, Robust and Controllable Text to Speech`_.
+
+    .. _`FastSpeech: Fast, Robust and Controllable Text to Speech`:
+        https://arxiv.org/pdf/1905.09263.pdf
+
+    """
+
+    def __init__(self, in_chans, hidden_chans, kernel_size, dropout_rate):
+        """Initialize MultiLayeredConv1d module.
+
+        Args:
+            in_chans (int): Number of input channels.
+            hidden_chans (int): Number of hidden channels.
+            kernel_size (int): Kernel size of conv1d.
+            dropout_rate (float): Dropout rate.
+
+        """
+        super(MultiLayeredConv1d, self).__init__()
+        self.w_1 = torch.nn.Conv1d(
+            in_chans,
+            hidden_chans,
+            kernel_size,
+            stride=1,
+            padding=(kernel_size - 1) // 2,
+        )
+        self.w_2 = torch.nn.Conv1d(
+            hidden_chans,
+            in_chans,
+            kernel_size,
+            stride=1,
+            padding=(kernel_size - 1) // 2,
+        )
+        self.dropout = torch.nn.Dropout(dropout_rate)
+
+    def forward(self, x):
+        """Calculate forward propagation.
+
+        Args:
+            x (Tensor): Batch of input tensors (B, ..., in_chans).
+
+        Returns:
+            Tensor: Batch of output tensors (B, ..., hidden_chans).
+
+        """
+        x = torch.relu(self.w_1(x.transpose(-1, 1))).transpose(-1, 1)
+        return self.w_2(self.dropout(x).transpose(-1, 1)).transpose(-1, 1)
+
+
+class Conv1dLinear(torch.nn.Module):
+    """Conv1D + Linear for Transformer block.
+
+    A variant of MultiLayeredConv1d, which replaces second conv-layer to linear.
+
+    """
+
+    def __init__(self, in_chans, hidden_chans, kernel_size, dropout_rate):
+        """Initialize Conv1dLinear module.
+
+        Args:
+            in_chans (int): Number of input channels.
+            hidden_chans (int): Number of hidden channels.
+            kernel_size (int): Kernel size of conv1d.
+            dropout_rate (float): Dropout rate.
+
+        """
+        super(Conv1dLinear, self).__init__()
+        self.w_1 = torch.nn.Conv1d(
+            in_chans,
+            hidden_chans,
+            kernel_size,
+            stride=1,
+            padding=(kernel_size - 1) // 2,
+        )
+        self.w_2 = torch.nn.Linear(hidden_chans, in_chans)
+        self.dropout = torch.nn.Dropout(dropout_rate)
+
+    def forward(self, x):
+        """Calculate forward propagation.
+
+        Args:
+            x (Tensor): Batch of input tensors (B, ..., in_chans).
+
+        Returns:
+            Tensor: Batch of output tensors (B, ..., hidden_chans).
+
+        """
+        x = torch.relu(self.w_1(x.transpose(-1, 1))).transpose(-1, 1)
+        return self.w_2(self.dropout(x))

ppg_extractor/encoder/positionwise_feed_forward.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Shigeki Karita
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Positionwise feed forward layer definition."""
+
+import torch
+
+
+class PositionwiseFeedForward(torch.nn.Module):
+    """Positionwise feed forward layer.
+
+    :param int idim: input dimenstion
+    :param int hidden_units: number of hidden units
+    :param float dropout_rate: dropout rate
+
+    """
+
+    def __init__(self, idim, hidden_units, dropout_rate, activation=torch.nn.ReLU()):
+        """Construct an PositionwiseFeedForward object."""
+        super(PositionwiseFeedForward, self).__init__()
+        self.w_1 = torch.nn.Linear(idim, hidden_units)
+        self.w_2 = torch.nn.Linear(hidden_units, idim)
+        self.dropout = torch.nn.Dropout(dropout_rate)
+        self.activation = activation
+
+    def forward(self, x):
+        """Forward funciton."""
+        return self.w_2(self.dropout(self.activation(self.w_1(x))))

ppg_extractor/encoder/repeat.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Shigeki Karita
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Repeat the same layer definition."""
+
+import torch
+
+
+class MultiSequential(torch.nn.Sequential):
+    """Multi-input multi-output torch.nn.Sequential."""
+
+    def forward(self, *args):
+        """Repeat."""
+        for m in self:
+            args = m(*args)
+        return args
+
+
+def repeat(N, fn):
+    """Repeat module N times.
+
+    :param int N: repeat time
+    :param function fn: function to generate module
+    :return: repeated modules
+    :rtype: MultiSequential
+    """
+    return MultiSequential(*[fn(n) for n in range(N)])

ppg_extractor/encoder/subsampling.py

@@ -0,0 +1,218 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Shigeki Karita
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Subsampling layer definition."""
+import logging
+import torch
+
+from espnet.nets.pytorch_backend.transformer.embedding import PositionalEncoding
+
+
+class Conv2dSubsampling(torch.nn.Module):
+    """Convolutional 2D subsampling (to 1/4 length or 1/2 length).
+
+    :param int idim: input dim
+    :param int odim: output dim
+    :param flaot dropout_rate: dropout rate
+    :param torch.nn.Module pos_enc: custom position encoding layer
+
+    """
+
+    def __init__(self, idim, odim, dropout_rate, pos_enc=None, 
+                 subsample_by_2=False,
+        ):
+        """Construct an Conv2dSubsampling object."""
+        super(Conv2dSubsampling, self).__init__()
+        self.subsample_by_2 = subsample_by_2
+        if subsample_by_2:
+            self.conv = torch.nn.Sequential(
+                torch.nn.Conv2d(1, odim, kernel_size=5, stride=1, padding=2),
+                torch.nn.ReLU(),
+                torch.nn.Conv2d(odim, odim, kernel_size=4, stride=2, padding=1),
+                torch.nn.ReLU(),
+            )
+            self.out = torch.nn.Sequential(
+                torch.nn.Linear(odim * (idim // 2), odim),
+                pos_enc if pos_enc is not None else PositionalEncoding(odim, dropout_rate),
+            )
+        else:
+            self.conv = torch.nn.Sequential(
+                torch.nn.Conv2d(1, odim, kernel_size=4, stride=2, padding=1),
+                torch.nn.ReLU(),
+                torch.nn.Conv2d(odim, odim, kernel_size=4, stride=2, padding=1),
+                torch.nn.ReLU(),
+            )
+            self.out = torch.nn.Sequential(
+                torch.nn.Linear(odim * (idim // 4), odim),
+                pos_enc if pos_enc is not None else PositionalEncoding(odim, dropout_rate),
+            )
+
+    def forward(self, x, x_mask):
+        """Subsample x.
+
+        :param torch.Tensor x: input tensor
+        :param torch.Tensor x_mask: input mask
+        :return: subsampled x and mask
+        :rtype Tuple[torch.Tensor, torch.Tensor]
+
+        """
+        x = x.unsqueeze(1)  # (b, c, t, f)
+        x = self.conv(x)
+        b, c, t, f = x.size()
+        x = self.out(x.transpose(1, 2).contiguous().view(b, t, c * f))
+        if x_mask is None:
+            return x, None
+        if self.subsample_by_2:
+            return x, x_mask[:, :, ::2]
+        else:
+            return x, x_mask[:, :, ::2][:, :, ::2]
+
+    def __getitem__(self, key):
+        """Subsample x.
+
+        When reset_parameters() is called, if use_scaled_pos_enc is used,
+            return the positioning encoding.
+
+        """
+        if key != -1:
+            raise NotImplementedError("Support only `-1` (for `reset_parameters`).")
+        return self.out[key]
+
+
+class Conv2dNoSubsampling(torch.nn.Module):
+    """Convolutional 2D without subsampling.
+
+    :param int idim: input dim
+    :param int odim: output dim
+    :param flaot dropout_rate: dropout rate
+    :param torch.nn.Module pos_enc: custom position encoding layer
+
+    """
+
+    def __init__(self, idim, odim, dropout_rate, pos_enc=None):
+        """Construct an Conv2dSubsampling object."""
+        super().__init__()
+        logging.info("Encoder does not do down-sample on mel-spectrogram.")
+        self.conv = torch.nn.Sequential(
+            torch.nn.Conv2d(1, odim, kernel_size=5, stride=1, padding=2),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(odim, odim, kernel_size=5, stride=1, padding=2),
+            torch.nn.ReLU(),
+        )
+        self.out = torch.nn.Sequential(
+            torch.nn.Linear(odim * idim, odim),
+            pos_enc if pos_enc is not None else PositionalEncoding(odim, dropout_rate),
+        )
+
+    def forward(self, x, x_mask):
+        """Subsample x.
+
+        :param torch.Tensor x: input tensor
+        :param torch.Tensor x_mask: input mask
+        :return: subsampled x and mask
+        :rtype Tuple[torch.Tensor, torch.Tensor]
+
+        """
+        x = x.unsqueeze(1)  # (b, c, t, f)
+        x = self.conv(x)
+        b, c, t, f = x.size()
+        x = self.out(x.transpose(1, 2).contiguous().view(b, t, c * f))
+        if x_mask is None:
+            return x, None
+        return x, x_mask
+
+    def __getitem__(self, key):
+        """Subsample x.
+
+        When reset_parameters() is called, if use_scaled_pos_enc is used,
+            return the positioning encoding.
+
+        """
+        if key != -1:
+            raise NotImplementedError("Support only `-1` (for `reset_parameters`).")
+        return self.out[key]
+
+
+class Conv2dSubsampling6(torch.nn.Module):
+    """Convolutional 2D subsampling (to 1/6 length).
+
+    :param int idim: input dim
+    :param int odim: output dim
+    :param flaot dropout_rate: dropout rate
+
+    """
+
+    def __init__(self, idim, odim, dropout_rate):
+        """Construct an Conv2dSubsampling object."""
+        super(Conv2dSubsampling6, self).__init__()
+        self.conv = torch.nn.Sequential(
+            torch.nn.Conv2d(1, odim, 3, 2),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(odim, odim, 5, 3),
+            torch.nn.ReLU(),
+        )
+        self.out = torch.nn.Sequential(
+            torch.nn.Linear(odim * (((idim - 1) // 2 - 2) // 3), odim),
+            PositionalEncoding(odim, dropout_rate),
+        )
+
+    def forward(self, x, x_mask):
+        """Subsample x.
+
+        :param torch.Tensor x: input tensor
+        :param torch.Tensor x_mask: input mask
+        :return: subsampled x and mask
+        :rtype Tuple[torch.Tensor, torch.Tensor]
+        """
+        x = x.unsqueeze(1)  # (b, c, t, f)
+        x = self.conv(x)
+        b, c, t, f = x.size()
+        x = self.out(x.transpose(1, 2).contiguous().view(b, t, c * f))
+        if x_mask is None:
+            return x, None
+        return x, x_mask[:, :, :-2:2][:, :, :-4:3]
+
+
+class Conv2dSubsampling8(torch.nn.Module):
+    """Convolutional 2D subsampling (to 1/8 length).
+
+    :param int idim: input dim
+    :param int odim: output dim
+    :param flaot dropout_rate: dropout rate
+
+    """
+
+    def __init__(self, idim, odim, dropout_rate):
+        """Construct an Conv2dSubsampling object."""
+        super(Conv2dSubsampling8, self).__init__()
+        self.conv = torch.nn.Sequential(
+            torch.nn.Conv2d(1, odim, 3, 2),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(odim, odim, 3, 2),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(odim, odim, 3, 2),
+            torch.nn.ReLU(),
+        )
+        self.out = torch.nn.Sequential(
+            torch.nn.Linear(odim * ((((idim - 1) // 2 - 1) // 2 - 1) // 2), odim),
+            PositionalEncoding(odim, dropout_rate),
+        )
+
+    def forward(self, x, x_mask):
+        """Subsample x.
+
+        :param torch.Tensor x: input tensor
+        :param torch.Tensor x_mask: input mask
+        :return: subsampled x and mask
+        :rtype Tuple[torch.Tensor, torch.Tensor]
+        """
+        x = x.unsqueeze(1)  # (b, c, t, f)
+        x = self.conv(x)
+        b, c, t, f = x.size()
+        x = self.out(x.transpose(1, 2).contiguous().view(b, t, c * f))
+        if x_mask is None:
+            return x, None
+        return x, x_mask[:, :, :-2:2][:, :, :-2:2][:, :, :-2:2]

ppg_extractor/encoder/swish.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright 2020 Johns Hopkins University (Shinji Watanabe)
+#                Northwestern Polytechnical University (Pengcheng Guo)
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Swish() activation function for Conformer."""
+
+import torch
+
+
+class Swish(torch.nn.Module):
+    """Construct an Swish object."""
+
+    def forward(self, x):
+        """Return Swich activation function."""
+        return x * torch.sigmoid(x)

ppg_extractor/encoder/vgg.py

@@ -0,0 +1,77 @@
+"""VGG2L definition for transformer-transducer."""
+
+import torch
+
+
+class VGG2L(torch.nn.Module):
+    """VGG2L module for transformer-transducer encoder."""
+
+    def __init__(self, idim, odim):
+        """Construct a VGG2L object.
+
+        Args:
+            idim (int): dimension of inputs
+            odim (int): dimension of outputs
+
+        """
+        super(VGG2L, self).__init__()
+
+        self.vgg2l = torch.nn.Sequential(
+            torch.nn.Conv2d(1, 64, 3, stride=1, padding=1),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(64, 64, 3, stride=1, padding=1),
+            torch.nn.ReLU(),
+            torch.nn.MaxPool2d((3, 2)),
+            torch.nn.Conv2d(64, 128, 3, stride=1, padding=1),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(128, 128, 3, stride=1, padding=1),
+            torch.nn.ReLU(),
+            torch.nn.MaxPool2d((2, 2)),
+        )
+
+        self.output = torch.nn.Linear(128 * ((idim // 2) // 2), odim)
+
+    def forward(self, x, x_mask):
+        """VGG2L forward for x.
+
+        Args:
+            x (torch.Tensor): input torch (B, T, idim)
+            x_mask (torch.Tensor): (B, 1, T)
+
+        Returns:
+            x (torch.Tensor): input torch (B, sub(T), attention_dim)
+            x_mask (torch.Tensor): (B, 1, sub(T))
+
+        """
+        x = x.unsqueeze(1)
+        x = self.vgg2l(x)
+
+        b, c, t, f = x.size()
+
+        x = self.output(x.transpose(1, 2).contiguous().view(b, t, c * f))
+
+        if x_mask is None:
+            return x, None
+        else:
+            x_mask = self.create_new_mask(x_mask, x)
+
+            return x, x_mask
+
+    def create_new_mask(self, x_mask, x):
+        """Create a subsampled version of x_mask.
+
+        Args:
+            x_mask (torch.Tensor): (B, 1, T)
+            x (torch.Tensor): (B, sub(T), attention_dim)
+
+        Returns:
+            x_mask (torch.Tensor): (B, 1, sub(T))
+
+        """
+        x_t1 = x_mask.size(2) - (x_mask.size(2) % 3)
+        x_mask = x_mask[:, :, :x_t1][:, :, ::3]
+
+        x_t2 = x_mask.size(2) - (x_mask.size(2) % 2)
+        x_mask = x_mask[:, :, :x_t2][:, :, ::2]
+
+        return x_mask

ppg_extractor/encoders.py

@@ -0,0 +1,298 @@
+import logging
+import six
+
+import numpy as np
+import torch
+import torch.nn.functional as F
+from torch.nn.utils.rnn import pack_padded_sequence
+from torch.nn.utils.rnn import pad_packed_sequence
+
+from .e2e_asr_common import get_vgg2l_odim
+from .nets_utils import make_pad_mask, to_device
+
+
+class RNNP(torch.nn.Module):
+    """RNN with projection layer module
+
+    :param int idim: dimension of inputs
+    :param int elayers: number of encoder layers
+    :param int cdim: number of rnn units (resulted in cdim * 2 if bidirectional)
+    :param int hdim: number of projection units
+    :param np.ndarray subsample: list of subsampling numbers
+    :param float dropout: dropout rate
+    :param str typ: The RNN type
+    """
+
+    def __init__(self, idim, elayers, cdim, hdim, subsample, dropout, typ="blstm"):
+        super(RNNP, self).__init__()
+        bidir = typ[0] == "b"
+        for i in six.moves.range(elayers):
+            if i == 0:
+                inputdim = idim
+            else:
+                inputdim = hdim
+            rnn = torch.nn.LSTM(inputdim, cdim, dropout=dropout, num_layers=1, bidirectional=bidir,
+                                batch_first=True) if "lstm" in typ \
+                else torch.nn.GRU(inputdim, cdim, dropout=dropout, num_layers=1, bidirectional=bidir, batch_first=True)
+            setattr(self, "%s%d" % ("birnn" if bidir else "rnn", i), rnn)
+            # bottleneck layer to merge
+            if bidir:
+                setattr(self, "bt%d" % i, torch.nn.Linear(2 * cdim, hdim))
+            else:
+                setattr(self, "bt%d" % i, torch.nn.Linear(cdim, hdim))
+
+        self.elayers = elayers
+        self.cdim = cdim
+        self.subsample = subsample
+        self.typ = typ
+        self.bidir = bidir
+
+    def forward(self, xs_pad, ilens, prev_state=None):
+        """RNNP forward
+
+        :param torch.Tensor xs_pad: batch of padded input sequences (B, Tmax, idim)
+        :param torch.Tensor ilens: batch of lengths of input sequences (B)
+        :param torch.Tensor prev_state: batch of previous RNN states
+        :return: batch of hidden state sequences (B, Tmax, hdim)
+        :rtype: torch.Tensor
+        """
+        logging.debug(self.__class__.__name__ + ' input lengths: ' + str(ilens))
+        elayer_states = []
+        for layer in six.moves.range(self.elayers):
+            xs_pack = pack_padded_sequence(xs_pad, ilens, batch_first=True, enforce_sorted=False)
+            rnn = getattr(self, ("birnn" if self.bidir else "rnn") + str(layer))
+            rnn.flatten_parameters()
+            if prev_state is not None and rnn.bidirectional:
+                prev_state = reset_backward_rnn_state(prev_state)
+            ys, states = rnn(xs_pack, hx=None if prev_state is None else prev_state[layer])
+            elayer_states.append(states)
+            # ys: utt list of frame x cdim x 2 (2: means bidirectional)
+            ys_pad, ilens = pad_packed_sequence(ys, batch_first=True)
+            sub = self.subsample[layer + 1]
+            if sub > 1:
+                ys_pad = ys_pad[:, ::sub]
+                ilens = [int(i + 1) // sub for i in ilens]
+            # (sum _utt frame_utt) x dim
+            projected = getattr(self, 'bt' + str(layer)
+                                )(ys_pad.contiguous().view(-1, ys_pad.size(2)))
+            if layer == self.elayers - 1:
+                xs_pad = projected.view(ys_pad.size(0), ys_pad.size(1), -1)
+            else:
+                xs_pad = torch.tanh(projected.view(ys_pad.size(0), ys_pad.size(1), -1))
+
+        return xs_pad, ilens, elayer_states  # x: utt list of frame x dim
+
+
+class RNN(torch.nn.Module):
+    """RNN module
+
+    :param int idim: dimension of inputs
+    :param int elayers: number of encoder layers
+    :param int cdim: number of rnn units (resulted in cdim * 2 if bidirectional)
+    :param int hdim: number of final projection units
+    :param float dropout: dropout rate
+    :param str typ: The RNN type
+    """
+
+    def __init__(self, idim, elayers, cdim, hdim, dropout, typ="blstm"):
+        super(RNN, self).__init__()
+        bidir = typ[0] == "b"
+        self.nbrnn = torch.nn.LSTM(idim, cdim, elayers, batch_first=True,
+                                   dropout=dropout, bidirectional=bidir) if "lstm" in typ \
+            else torch.nn.GRU(idim, cdim, elayers, batch_first=True, dropout=dropout,
+                              bidirectional=bidir)
+        if bidir:
+            self.l_last = torch.nn.Linear(cdim * 2, hdim)
+        else:
+            self.l_last = torch.nn.Linear(cdim, hdim)
+        self.typ = typ
+
+    def forward(self, xs_pad, ilens, prev_state=None):
+        """RNN forward
+
+        :param torch.Tensor xs_pad: batch of padded input sequences (B, Tmax, D)
+        :param torch.Tensor ilens: batch of lengths of input sequences (B)
+        :param torch.Tensor prev_state: batch of previous RNN states
+        :return: batch of hidden state sequences (B, Tmax, eprojs)
+        :rtype: torch.Tensor
+        """
+        logging.debug(self.__class__.__name__ + ' input lengths: ' + str(ilens))
+        xs_pack = pack_padded_sequence(xs_pad, ilens, batch_first=True)
+        self.nbrnn.flatten_parameters()
+        if prev_state is not None and self.nbrnn.bidirectional:
+            # We assume that when previous state is passed, it means that we're streaming the input
+            # and therefore cannot propagate backward BRNN state (otherwise it goes in the wrong direction)
+            prev_state = reset_backward_rnn_state(prev_state)
+        ys, states = self.nbrnn(xs_pack, hx=prev_state)
+        # ys: utt list of frame x cdim x 2 (2: means bidirectional)
+        ys_pad, ilens = pad_packed_sequence(ys, batch_first=True)
+        # (sum _utt frame_utt) x dim
+        projected = torch.tanh(self.l_last(
+            ys_pad.contiguous().view(-1, ys_pad.size(2))))
+        xs_pad = projected.view(ys_pad.size(0), ys_pad.size(1), -1)
+        return xs_pad, ilens, states  # x: utt list of frame x dim
+
+
+def reset_backward_rnn_state(states):
+    """Sets backward BRNN states to zeroes - useful in processing of sliding windows over the inputs"""
+    if isinstance(states, (list, tuple)):
+        for state in states:
+            state[1::2] = 0.
+    else:
+        states[1::2] = 0.
+    return states
+
+
+class VGG2L(torch.nn.Module):
+    """VGG-like module
+
+    :param int in_channel: number of input channels
+    """
+
+    def __init__(self, in_channel=1, downsample=True):
+        super(VGG2L, self).__init__()
+        # CNN layer (VGG motivated)
+        self.conv1_1 = torch.nn.Conv2d(in_channel, 64, 3, stride=1, padding=1)
+        self.conv1_2 = torch.nn.Conv2d(64, 64, 3, stride=1, padding=1)
+        self.conv2_1 = torch.nn.Conv2d(64, 128, 3, stride=1, padding=1)
+        self.conv2_2 = torch.nn.Conv2d(128, 128, 3, stride=1, padding=1)
+
+        self.in_channel = in_channel
+        self.downsample = downsample
+        if downsample:
+            self.stride = 2
+        else:
+            self.stride = 1
+
+    def forward(self, xs_pad, ilens, **kwargs):
+        """VGG2L forward
+
+        :param torch.Tensor xs_pad: batch of padded input sequences (B, Tmax, D)
+        :param torch.Tensor ilens: batch of lengths of input sequences (B)
+        :return: batch of padded hidden state sequences (B, Tmax // 4, 128 * D // 4) if downsample
+        :rtype: torch.Tensor
+        """
+        logging.debug(self.__class__.__name__ + ' input lengths: ' + str(ilens))
+
+        # x: utt x frame x dim
+        # xs_pad = F.pad_sequence(xs_pad)
+
+        # x: utt x 1 (input channel num) x frame x dim
+        xs_pad = xs_pad.view(xs_pad.size(0), xs_pad.size(1), self.in_channel,
+                             xs_pad.size(2) // self.in_channel).transpose(1, 2)
+
+        # NOTE: max_pool1d ?
+        xs_pad = F.relu(self.conv1_1(xs_pad))
+        xs_pad = F.relu(self.conv1_2(xs_pad))
+        if self.downsample:
+            xs_pad = F.max_pool2d(xs_pad, 2, stride=self.stride, ceil_mode=True)
+
+        xs_pad = F.relu(self.conv2_1(xs_pad))
+        xs_pad = F.relu(self.conv2_2(xs_pad))
+        if self.downsample:
+            xs_pad = F.max_pool2d(xs_pad, 2, stride=self.stride, ceil_mode=True)
+        if torch.is_tensor(ilens):
+            ilens = ilens.cpu().numpy()
+        else:
+            ilens = np.array(ilens, dtype=np.float32)
+        if self.downsample:
+            ilens = np.array(np.ceil(ilens / 2), dtype=np.int64)
+            ilens = np.array(
+                np.ceil(np.array(ilens, dtype=np.float32) / 2), dtype=np.int64).tolist()
+
+        # x: utt_list of frame (remove zeropaded frames) x (input channel num x dim)
+        xs_pad = xs_pad.transpose(1, 2)
+        xs_pad = xs_pad.contiguous().view(
+            xs_pad.size(0), xs_pad.size(1), xs_pad.size(2) * xs_pad.size(3))
+        return xs_pad, ilens, None  # no state in this layer
+
+
+class Encoder(torch.nn.Module):
+    """Encoder module
+
+    :param str etype: type of encoder network
+    :param int idim: number of dimensions of encoder network
+    :param int elayers: number of layers of encoder network
+    :param int eunits: number of lstm units of encoder network
+    :param int eprojs: number of projection units of encoder network
+    :param np.ndarray subsample: list of subsampling numbers
+    :param float dropout: dropout rate
+    :param int in_channel: number of input channels
+    """
+
+    def __init__(self, etype, idim, elayers, eunits, eprojs, subsample, dropout, in_channel=1):
+        super(Encoder, self).__init__()
+        typ = etype.lstrip("vgg").rstrip("p")
+        if typ not in ['lstm', 'gru', 'blstm', 'bgru']:
+            logging.error("Error: need to specify an appropriate encoder architecture")
+
+        if etype.startswith("vgg"):
+            if etype[-1] == "p":
+                self.enc = torch.nn.ModuleList([VGG2L(in_channel),
+                                                RNNP(get_vgg2l_odim(idim, in_channel=in_channel), elayers, eunits,
+                                                     eprojs,
+                                                     subsample, dropout, typ=typ)])
+                logging.info('Use CNN-VGG + ' + typ.upper() + 'P for encoder')
+            else:
+                self.enc = torch.nn.ModuleList([VGG2L(in_channel),
+                                                RNN(get_vgg2l_odim(idim, in_channel=in_channel), elayers, eunits,
+                                                    eprojs,
+                                                    dropout, typ=typ)])
+                logging.info('Use CNN-VGG + ' + typ.upper() + ' for encoder')
+        else:
+            if etype[-1] == "p":
+                self.enc = torch.nn.ModuleList(
+                    [RNNP(idim, elayers, eunits, eprojs, subsample, dropout, typ=typ)])
+                logging.info(typ.upper() + ' with every-layer projection for encoder')
+            else:
+                self.enc = torch.nn.ModuleList([RNN(idim, elayers, eunits, eprojs, dropout, typ=typ)])
+                logging.info(typ.upper() + ' without projection for encoder')
+
+    def forward(self, xs_pad, ilens, prev_states=None):
+        """Encoder forward
+
+        :param torch.Tensor xs_pad: batch of padded input sequences (B, Tmax, D)
+        :param torch.Tensor ilens: batch of lengths of input sequences (B)
+        :param torch.Tensor prev_state: batch of previous encoder hidden states (?, ...)
+        :return: batch of hidden state sequences (B, Tmax, eprojs)
+        :rtype: torch.Tensor
+        """
+        if prev_states is None:
+            prev_states = [None] * len(self.enc)
+        assert len(prev_states) == len(self.enc)
+
+        current_states = []
+        for module, prev_state in zip(self.enc, prev_states):
+            xs_pad, ilens, states = module(xs_pad, ilens, prev_state=prev_state)
+            current_states.append(states)
+
+        # make mask to remove bias value in padded part
+        mask = to_device(self, make_pad_mask(ilens).unsqueeze(-1))
+
+        return xs_pad.masked_fill(mask, 0.0), ilens, current_states
+
+
+def encoder_for(args, idim, subsample):
+    """Instantiates an encoder module given the program arguments
+
+    :param Namespace args: The arguments
+    :param int or List of integer idim: dimension of input, e.g. 83, or
+                                        List of dimensions of inputs, e.g. [83,83]
+    :param List or List of List subsample: subsample factors, e.g. [1,2,2,1,1], or
+                                        List of subsample factors of each encoder. e.g. [[1,2,2,1,1], [1,2,2,1,1]]
+    :rtype torch.nn.Module
+    :return: The encoder module
+    """
+    num_encs = getattr(args, "num_encs", 1)  # use getattr to keep compatibility
+    if num_encs == 1:
+        # compatible with single encoder asr mode
+        return Encoder(args.etype, idim, args.elayers, args.eunits, args.eprojs, subsample, args.dropout_rate)
+    elif num_encs >= 1:
+        enc_list = torch.nn.ModuleList()
+        for idx in range(num_encs):
+            enc = Encoder(args.etype[idx], idim[idx], args.elayers[idx], args.eunits[idx], args.eprojs, subsample[idx],
+                          args.dropout_rate[idx])
+            enc_list.append(enc)
+        return enc_list
+    else:
+        raise ValueError("Number of encoders needs to be more than one. {}".format(num_encs))

ppg_extractor/frontend.py

@@ -0,0 +1,115 @@
+import copy
+from typing import Tuple
+import numpy as np
+import torch
+from torch_complex.tensor import ComplexTensor
+
+from .log_mel import LogMel
+from .stft import Stft
+
+
+class DefaultFrontend(torch.nn.Module):
+    """Conventional frontend structure for ASR
+
+    Stft -> WPE -> MVDR-Beamformer -> Power-spec -> Mel-Fbank -> CMVN
+    """
+
+    def __init__(
+        self,
+        fs: 16000,
+        n_fft: int = 1024,
+        win_length: int = 800,
+        hop_length: int = 160,
+        center: bool = True,
+        pad_mode: str = "reflect",
+        normalized: bool = False,
+        onesided: bool = True,
+        n_mels: int = 80,
+        fmin: int = None,
+        fmax: int = None,
+        htk: bool = False,
+        norm=1,
+        frontend_conf=None, #Optional[dict] = get_default_kwargs(Frontend),
+        kaldi_padding_mode=False,
+        downsample_rate: int = 1,
+    ):
+        super().__init__()
+        self.downsample_rate = downsample_rate
+
+        # Deepcopy (In general, dict shouldn't be used as default arg)
+        frontend_conf = copy.deepcopy(frontend_conf)
+
+        self.stft = Stft(
+            n_fft=n_fft,
+            win_length=win_length,
+            hop_length=hop_length,
+            center=center,
+            pad_mode=pad_mode,
+            normalized=normalized,
+            onesided=onesided,
+            kaldi_padding_mode=kaldi_padding_mode
+        )
+        if frontend_conf is not None:
+            self.frontend = Frontend(idim=n_fft // 2 + 1, **frontend_conf)
+        else:
+            self.frontend = None
+
+        self.logmel = LogMel(
+            fs=fs, n_fft=n_fft, n_mels=n_mels, fmin=fmin, fmax=fmax, htk=htk, norm=norm,
+        )
+        self.n_mels = n_mels
+
+    def output_size(self) -> int:
+        return self.n_mels
+
+    def forward(
+        self, input: torch.Tensor, input_lengths: torch.Tensor
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        # 1. Domain-conversion: e.g. Stft: time -> time-freq
+        input_stft, feats_lens = self.stft(input, input_lengths)
+
+        assert input_stft.dim() >= 4, input_stft.shape
+        # "2" refers to the real/imag parts of Complex
+        assert input_stft.shape[-1] == 2, input_stft.shape
+
+        # Change torch.Tensor to ComplexTensor
+        # input_stft: (..., F, 2) -> (..., F)
+        input_stft = ComplexTensor(input_stft[..., 0], input_stft[..., 1])
+
+        # 2. [Option] Speech enhancement
+        if self.frontend is not None:
+            assert isinstance(input_stft, ComplexTensor), type(input_stft)
+            # input_stft: (Batch, Length, [Channel], Freq)
+            input_stft, _, mask = self.frontend(input_stft, feats_lens)
+
+        # 3. [Multi channel case]: Select a channel
+        if input_stft.dim() == 4:
+            # h: (B, T, C, F) -> h: (B, T, F)
+            if self.training:
+                # Select 1ch randomly
+                ch = np.random.randint(input_stft.size(2))
+                input_stft = input_stft[:, :, ch, :]
+            else:
+                # Use the first channel
+                input_stft = input_stft[:, :, 0, :]
+
+        # 4. STFT -> Power spectrum
+        # h: ComplexTensor(B, T, F) -> torch.Tensor(B, T, F)
+        input_power = input_stft.real ** 2 + input_stft.imag ** 2
+
+        # 5. Feature transform e.g. Stft -> Log-Mel-Fbank
+        # input_power: (Batch, [Channel,] Length, Freq)
+        #       -> input_feats: (Batch, Length, Dim)
+        input_feats, _ = self.logmel(input_power, feats_lens)
+               
+        # NOTE(sx): pad
+        max_len = input_feats.size(1)
+        if self.downsample_rate > 1 and max_len % self.downsample_rate != 0:
+            padding = self.downsample_rate - max_len % self.downsample_rate
+            # print("Logmel: ", input_feats.size())
+            input_feats = torch.nn.functional.pad(input_feats, (0, 0, 0, padding),
+                                                  "constant", 0)
+            # print("Logmel(after padding): ",input_feats.size())
+            feats_lens[torch.argmax(feats_lens)] = max_len + padding 
+
+        return input_feats, feats_lens

ppg_extractor/log_mel.py

@@ -0,0 +1,74 @@
+import librosa
+import numpy as np
+import torch
+from typing import Tuple
+
+from .nets_utils import make_pad_mask
+
+
+class LogMel(torch.nn.Module):
+    """Convert STFT to fbank feats
+
+    The arguments is same as librosa.filters.mel
+
+    Args:
+        fs: number > 0 [scalar] sampling rate of the incoming signal
+        n_fft: int > 0 [scalar] number of FFT components
+        n_mels: int > 0 [scalar] number of Mel bands to generate
+        fmin: float >= 0 [scalar] lowest frequency (in Hz)
+        fmax: float >= 0 [scalar] highest frequency (in Hz).
+            If `None`, use `fmax = fs / 2.0`
+        htk: use HTK formula instead of Slaney
+        norm: {None, 1, np.inf} [scalar]
+            if 1, divide the triangular mel weights by the width of the mel band
+            (area normalization).  Otherwise, leave all the triangles aiming for
+            a peak value of 1.0
+
+    """
+
+    def __init__(
+        self,
+        fs: int = 16000,
+        n_fft: int = 512,
+        n_mels: int = 80,
+        fmin: float = None,
+        fmax: float = None,
+        htk: bool = False,
+        norm=1,
+    ):
+        super().__init__()
+
+        fmin = 0 if fmin is None else fmin
+        fmax = fs / 2 if fmax is None else fmax
+        _mel_options = dict(
+            sr=fs, n_fft=n_fft, n_mels=n_mels, fmin=fmin, fmax=fmax, htk=htk, norm=norm
+        )
+        self.mel_options = _mel_options
+
+        # Note(kamo): The mel matrix of librosa is different from kaldi.
+        melmat = librosa.filters.mel(**_mel_options)
+        # melmat: (D2, D1) -> (D1, D2)
+        self.register_buffer("melmat", torch.from_numpy(melmat.T).float())
+        inv_mel = np.linalg.pinv(melmat)
+        self.register_buffer("inv_melmat", torch.from_numpy(inv_mel.T).float())
+
+    def extra_repr(self):
+        return ", ".join(f"{k}={v}" for k, v in self.mel_options.items())
+
+    def forward(
+        self, feat: torch.Tensor, ilens: torch.Tensor = None,
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        # feat: (B, T, D1) x melmat: (D1, D2) -> mel_feat: (B, T, D2)
+        mel_feat = torch.matmul(feat, self.melmat)
+
+        logmel_feat = (mel_feat + 1e-20).log()
+        # Zero padding
+        if ilens is not None:
+            logmel_feat = logmel_feat.masked_fill(
+                make_pad_mask(ilens, logmel_feat, 1), 0.0
+            )
+        else:
+            ilens = feat.new_full(
+                [feat.size(0)], fill_value=feat.size(1), dtype=torch.long
+            )
+        return logmel_feat, ilens

ppg_extractor/nets_utils.py

@@ -0,0 +1,465 @@
+# -*- coding: utf-8 -*-
+
+"""Network related utility tools."""
+
+import logging
+from typing import Dict
+
+import numpy as np
+import torch
+
+
+def to_device(m, x):
+    """Send tensor into the device of the module.
+
+    Args:
+        m (torch.nn.Module): Torch module.
+        x (Tensor): Torch tensor.
+
+    Returns:
+        Tensor: Torch tensor located in the same place as torch module.
+
+    """
+    assert isinstance(m, torch.nn.Module)
+    device = next(m.parameters()).device
+    return x.to(device)
+
+
+def pad_list(xs, pad_value):
+    """Perform padding for the list of tensors.
+
+    Args:
+        xs (List): List of Tensors [(T_1, `*`), (T_2, `*`), ..., (T_B, `*`)].
+        pad_value (float): Value for padding.
+
+    Returns:
+        Tensor: Padded tensor (B, Tmax, `*`).
+
+    Examples:
+        >>> x = [torch.ones(4), torch.ones(2), torch.ones(1)]
+        >>> x
+        [tensor([1., 1., 1., 1.]), tensor([1., 1.]), tensor([1.])]
+        >>> pad_list(x, 0)
+        tensor([[1., 1., 1., 1.],
+                [1., 1., 0., 0.],
+                [1., 0., 0., 0.]])
+
+    """
+    n_batch = len(xs)
+    max_len = max(x.size(0) for x in xs)
+    pad = xs[0].new(n_batch, max_len, *xs[0].size()[1:]).fill_(pad_value)
+
+    for i in range(n_batch):
+        pad[i, :xs[i].size(0)] = xs[i]
+
+    return pad
+
+
+def make_pad_mask(lengths, xs=None, length_dim=-1):
+    """Make mask tensor containing indices of padded part.
+
+    Args:
+        lengths (LongTensor or List): Batch of lengths (B,).
+        xs (Tensor, optional): The reference tensor. If set, masks will be the same shape as this tensor.
+        length_dim (int, optional): Dimension indicator of the above tensor. See the example.
+
+    Returns:
+        Tensor: Mask tensor containing indices of padded part.
+                dtype=torch.uint8 in PyTorch 1.2-
+                dtype=torch.bool in PyTorch 1.2+ (including 1.2)
+
+    Examples:
+        With only lengths.
+
+        >>> lengths = [5, 3, 2]
+        >>> make_non_pad_mask(lengths)
+        masks = [[0, 0, 0, 0 ,0],
+                 [0, 0, 0, 1, 1],
+                 [0, 0, 1, 1, 1]]
+
+        With the reference tensor.
+
+        >>> xs = torch.zeros((3, 2, 4))
+        >>> make_pad_mask(lengths, xs)
+        tensor([[[0, 0, 0, 0],
+                 [0, 0, 0, 0]],
+                [[0, 0, 0, 1],
+                 [0, 0, 0, 1]],
+                [[0, 0, 1, 1],
+                 [0, 0, 1, 1]]], dtype=torch.uint8)
+        >>> xs = torch.zeros((3, 2, 6))
+        >>> make_pad_mask(lengths, xs)
+        tensor([[[0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1]],
+                [[0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1]],
+                [[0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1]]], dtype=torch.uint8)
+
+        With the reference tensor and dimension indicator.
+
+        >>> xs = torch.zeros((3, 6, 6))
+        >>> make_pad_mask(lengths, xs, 1)
+        tensor([[[0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [1, 1, 1, 1, 1, 1]],
+                [[0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1]],
+                [[0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1]]], dtype=torch.uint8)
+        >>> make_pad_mask(lengths, xs, 2)
+        tensor([[[0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1],
+                 [0, 0, 0, 0, 0, 1]],
+                [[0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1],
+                 [0, 0, 0, 1, 1, 1]],
+                [[0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1],
+                 [0, 0, 1, 1, 1, 1]]], dtype=torch.uint8)
+
+    """
+    if length_dim == 0:
+        raise ValueError('length_dim cannot be 0: {}'.format(length_dim))
+
+    if not isinstance(lengths, list):
+        lengths = lengths.tolist()
+    bs = int(len(lengths))
+    if xs is None:
+        maxlen = int(max(lengths))
+    else:
+        maxlen = xs.size(length_dim)
+
+    seq_range = torch.arange(0, maxlen, dtype=torch.int64)
+    seq_range_expand = seq_range.unsqueeze(0).expand(bs, maxlen)
+    seq_length_expand = seq_range_expand.new(lengths).unsqueeze(-1)
+    mask = seq_range_expand >= seq_length_expand
+
+    if xs is not None:
+        assert xs.size(0) == bs, (xs.size(0), bs)
+
+        if length_dim < 0:
+            length_dim = xs.dim() + length_dim
+        # ind = (:, None, ..., None, :, , None, ..., None)
+        ind = tuple(slice(None) if i in (0, length_dim) else None
+                    for i in range(xs.dim()))
+        mask = mask[ind].expand_as(xs).to(xs.device)
+    return mask
+
+
+def make_non_pad_mask(lengths, xs=None, length_dim=-1):
+    """Make mask tensor containing indices of non-padded part.
+
+    Args:
+        lengths (LongTensor or List): Batch of lengths (B,).
+        xs (Tensor, optional): The reference tensor. If set, masks will be the same shape as this tensor.
+        length_dim (int, optional): Dimension indicator of the above tensor. See the example.
+
+    Returns:
+        ByteTensor: mask tensor containing indices of padded part.
+                    dtype=torch.uint8 in PyTorch 1.2-
+                    dtype=torch.bool in PyTorch 1.2+ (including 1.2)
+
+    Examples:
+        With only lengths.
+
+        >>> lengths = [5, 3, 2]
+        >>> make_non_pad_mask(lengths)
+        masks = [[1, 1, 1, 1 ,1],
+                 [1, 1, 1, 0, 0],
+                 [1, 1, 0, 0, 0]]
+
+        With the reference tensor.
+
+        >>> xs = torch.zeros((3, 2, 4))
+        >>> make_non_pad_mask(lengths, xs)
+        tensor([[[1, 1, 1, 1],
+                 [1, 1, 1, 1]],
+                [[1, 1, 1, 0],
+                 [1, 1, 1, 0]],
+                [[1, 1, 0, 0],
+                 [1, 1, 0, 0]]], dtype=torch.uint8)
+        >>> xs = torch.zeros((3, 2, 6))
+        >>> make_non_pad_mask(lengths, xs)
+        tensor([[[1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0]],
+                [[1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0]],
+                [[1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0]]], dtype=torch.uint8)
+
+        With the reference tensor and dimension indicator.
+
+        >>> xs = torch.zeros((3, 6, 6))
+        >>> make_non_pad_mask(lengths, xs, 1)
+        tensor([[[1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [0, 0, 0, 0, 0, 0]],
+                [[1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0]],
+                [[1, 1, 1, 1, 1, 1],
+                 [1, 1, 1, 1, 1, 1],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0],
+                 [0, 0, 0, 0, 0, 0]]], dtype=torch.uint8)
+        >>> make_non_pad_mask(lengths, xs, 2)
+        tensor([[[1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0],
+                 [1, 1, 1, 1, 1, 0]],
+                [[1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0],
+                 [1, 1, 1, 0, 0, 0]],
+                [[1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0],
+                 [1, 1, 0, 0, 0, 0]]], dtype=torch.uint8)
+
+    """
+    return ~make_pad_mask(lengths, xs, length_dim)
+
+
+def mask_by_length(xs, lengths, fill=0):
+    """Mask tensor according to length.
+
+    Args:
+        xs (Tensor): Batch of input tensor (B, `*`).
+        lengths (LongTensor or List): Batch of lengths (B,).
+        fill (int or float): Value to fill masked part.
+
+    Returns:
+        Tensor: Batch of masked input tensor (B, `*`).
+
+    Examples:
+        >>> x = torch.arange(5).repeat(3, 1) + 1
+        >>> x
+        tensor([[1, 2, 3, 4, 5],
+                [1, 2, 3, 4, 5],
+                [1, 2, 3, 4, 5]])
+        >>> lengths = [5, 3, 2]
+        >>> mask_by_length(x, lengths)
+        tensor([[1, 2, 3, 4, 5],
+                [1, 2, 3, 0, 0],
+                [1, 2, 0, 0, 0]])
+
+    """
+    assert xs.size(0) == len(lengths)
+    ret = xs.data.new(*xs.size()).fill_(fill)
+    for i, l in enumerate(lengths):
+        ret[i, :l] = xs[i, :l]
+    return ret
+
+
+def th_accuracy(pad_outputs, pad_targets, ignore_label):
+    """Calculate accuracy.
+
+    Args:
+        pad_outputs (Tensor): Prediction tensors (B * Lmax, D).
+        pad_targets (LongTensor): Target label tensors (B, Lmax, D).
+        ignore_label (int): Ignore label id.
+
+    Returns:
+        float: Accuracy value (0.0 - 1.0).
+
+    """
+    pad_pred = pad_outputs.view(
+        pad_targets.size(0),
+        pad_targets.size(1),
+        pad_outputs.size(1)).argmax(2)
+    mask = pad_targets != ignore_label
+    numerator = torch.sum(pad_pred.masked_select(mask) == pad_targets.masked_select(mask))
+    denominator = torch.sum(mask)
+    return float(numerator) / float(denominator)
+
+
+def to_torch_tensor(x):
+    """Change to torch.Tensor or ComplexTensor from numpy.ndarray.
+
+    Args:
+        x: Inputs. It should be one of numpy.ndarray, Tensor, ComplexTensor, and dict.
+
+    Returns:
+        Tensor or ComplexTensor: Type converted inputs.
+
+    Examples:
+        >>> xs = np.ones(3, dtype=np.float32)
+        >>> xs = to_torch_tensor(xs)
+        tensor([1., 1., 1.])
+        >>> xs = torch.ones(3, 4, 5)
+        >>> assert to_torch_tensor(xs) is xs
+        >>> xs = {'real': xs, 'imag': xs}
+        >>> to_torch_tensor(xs)
+        ComplexTensor(
+        Real:
+        tensor([1., 1., 1.])
+        Imag;
+        tensor([1., 1., 1.])
+        )
+
+    """
+    # If numpy, change to torch tensor
+    if isinstance(x, np.ndarray):
+        if x.dtype.kind == 'c':
+            # Dynamically importing because torch_complex requires python3
+            from torch_complex.tensor import ComplexTensor
+            return ComplexTensor(x)
+        else:
+            return torch.from_numpy(x)
+
+    # If {'real': ..., 'imag': ...}, convert to ComplexTensor
+    elif isinstance(x, dict):
+        # Dynamically importing because torch_complex requires python3
+        from torch_complex.tensor import ComplexTensor
+
+        if 'real' not in x or 'imag' not in x:
+            raise ValueError("has 'real' and 'imag' keys: {}".format(list(x)))
+        # Relative importing because of using python3 syntax
+        return ComplexTensor(x['real'], x['imag'])
+
+    # If torch.Tensor, as it is
+    elif isinstance(x, torch.Tensor):
+        return x
+
+    else:
+        error = ("x must be numpy.ndarray, torch.Tensor or a dict like "
+                 "{{'real': torch.Tensor, 'imag': torch.Tensor}}, "
+                 "but got {}".format(type(x)))
+        try:
+            from torch_complex.tensor import ComplexTensor
+        except Exception:
+            # If PY2
+            raise ValueError(error)
+        else:
+            # If PY3
+            if isinstance(x, ComplexTensor):
+                return x
+            else:
+                raise ValueError(error)
+
+
+def get_subsample(train_args, mode, arch):
+    """Parse the subsampling factors from the training args for the specified `mode` and `arch`.
+
+    Args:
+        train_args: argument Namespace containing options.
+        mode: one of ('asr', 'mt', 'st')
+        arch: one of ('rnn', 'rnn-t', 'rnn_mix', 'rnn_mulenc', 'transformer')
+
+    Returns:
+        np.ndarray / List[np.ndarray]: subsampling factors.
+    """
+    if arch == 'transformer':
+        return np.array([1])
+
+    elif mode == 'mt' and arch == 'rnn':
+        # +1 means input (+1) and layers outputs (train_args.elayer)
+        subsample = np.ones(train_args.elayers + 1, dtype=np.int)
+        logging.warning('Subsampling is not performed for machine translation.')
+        logging.info('subsample: ' + ' '.join([str(x) for x in subsample]))
+        return subsample
+
+    elif (mode == 'asr' and arch in ('rnn', 'rnn-t')) or \
+         (mode == 'mt' and arch == 'rnn') or \
+         (mode == 'st' and arch == 'rnn'):
+        subsample = np.ones(train_args.elayers + 1, dtype=np.int)
+        if train_args.etype.endswith("p") and not train_args.etype.startswith("vgg"):
+            ss = train_args.subsample.split("_")
+            for j in range(min(train_args.elayers + 1, len(ss))):
+                subsample[j] = int(ss[j])
+        else:
+            logging.warning(
+                'Subsampling is not performed for vgg*. It is performed in max pooling layers at CNN.')
+        logging.info('subsample: ' + ' '.join([str(x) for x in subsample]))
+        return subsample
+
+    elif mode == 'asr' and arch == 'rnn_mix':
+        subsample = np.ones(train_args.elayers_sd + train_args.elayers + 1, dtype=np.int)
+        if train_args.etype.endswith("p") and not train_args.etype.startswith("vgg"):
+            ss = train_args.subsample.split("_")
+            for j in range(min(train_args.elayers_sd + train_args.elayers + 1, len(ss))):
+                subsample[j] = int(ss[j])
+        else:
+            logging.warning(
+                'Subsampling is not performed for vgg*. It is performed in max pooling layers at CNN.')
+        logging.info('subsample: ' + ' '.join([str(x) for x in subsample]))
+        return subsample
+
+    elif mode == 'asr' and arch == 'rnn_mulenc':
+        subsample_list = []
+        for idx in range(train_args.num_encs):
+            subsample = np.ones(train_args.elayers[idx] + 1, dtype=np.int)
+            if train_args.etype[idx].endswith("p") and not train_args.etype[idx].startswith("vgg"):
+                ss = train_args.subsample[idx].split("_")
+                for j in range(min(train_args.elayers[idx] + 1, len(ss))):
+                    subsample[j] = int(ss[j])
+            else:
+                logging.warning(
+                    'Encoder %d: Subsampling is not performed for vgg*. '
+                    'It is performed in max pooling layers at CNN.', idx + 1)
+            logging.info('subsample: ' + ' '.join([str(x) for x in subsample]))
+            subsample_list.append(subsample)
+        return subsample_list
+
+    else:
+        raise ValueError('Invalid options: mode={}, arch={}'.format(mode, arch))
+
+
+def rename_state_dict(old_prefix: str, new_prefix: str, state_dict: Dict[str, torch.Tensor]):
+    """Replace keys of old prefix with new prefix in state dict."""
+    # need this list not to break the dict iterator
+    old_keys = [k for k in state_dict if k.startswith(old_prefix)]
+    if len(old_keys) > 0:
+        logging.warning(f'Rename: {old_prefix} -> {new_prefix}')
+    for k in old_keys:
+        v = state_dict.pop(k)
+        new_k = k.replace(old_prefix, new_prefix)
+        state_dict[new_k] = v
+
+def get_activation(act):
+    """Return activation function."""
+    # Lazy load to avoid unused import
+    from .encoder.swish import Swish
+
+    activation_funcs = {
+        "hardtanh": torch.nn.Hardtanh,
+        "relu": torch.nn.ReLU,
+        "selu": torch.nn.SELU,
+        "swish": Swish,
+    }
+
+    return activation_funcs[act]()

ppg_extractor/stft.py

@@ -0,0 +1,118 @@
+from typing import Optional
+from typing import Tuple
+from typing import Union
+
+import torch
+
+from .nets_utils import make_pad_mask
+
+
+class Stft(torch.nn.Module):
+    def __init__(
+        self,
+        n_fft: int = 512,
+        win_length: Union[int, None] = 512,
+        hop_length: int = 128,
+        center: bool = True,
+        pad_mode: str = "reflect",
+        normalized: bool = False,
+        onesided: bool = True,
+        kaldi_padding_mode=False,
+    ):
+        super().__init__()
+        self.n_fft = n_fft
+        if win_length is None:
+            self.win_length = n_fft
+        else:
+            self.win_length = win_length
+        self.hop_length = hop_length
+        self.center = center
+        self.pad_mode = pad_mode
+        self.normalized = normalized
+        self.onesided = onesided
+        self.kaldi_padding_mode = kaldi_padding_mode
+        if self.kaldi_padding_mode:
+            self.win_length = 400
+
+    def extra_repr(self):
+        return (
+            f"n_fft={self.n_fft}, "
+            f"win_length={self.win_length}, "
+            f"hop_length={self.hop_length}, "
+            f"center={self.center}, "
+            f"pad_mode={self.pad_mode}, "
+            f"normalized={self.normalized}, "
+            f"onesided={self.onesided}"
+        )
+
+    def forward(
+        self, input: torch.Tensor, ilens: torch.Tensor = None
+    ) -> Tuple[torch.Tensor, Optional[torch.Tensor]]:
+        """STFT forward function.
+
+        Args:
+            input: (Batch, Nsamples) or (Batch, Nsample, Channels)
+            ilens: (Batch)
+        Returns:
+            output: (Batch, Frames, Freq, 2) or (Batch, Frames, Channels, Freq, 2)
+
+        """
+        bs = input.size(0)
+        if input.dim() == 3:
+            multi_channel = True
+            # input: (Batch, Nsample, Channels) -> (Batch * Channels, Nsample)
+            input = input.transpose(1, 2).reshape(-1, input.size(1))
+        else:
+            multi_channel = False
+
+        # output: (Batch, Freq, Frames, 2=real_imag)
+        # or (Batch, Channel, Freq, Frames, 2=real_imag)
+        if not self.kaldi_padding_mode:
+            output = torch.stft(
+                input,
+                n_fft=self.n_fft,
+                win_length=self.win_length,
+                hop_length=self.hop_length,
+                center=self.center,
+                pad_mode=self.pad_mode,
+                normalized=self.normalized,
+                onesided=self.onesided,
+                return_complex=False
+            )
+        else:
+            # NOTE(sx): Use Kaldi-fasion padding, maybe wrong
+            num_pads = self.n_fft - self.win_length
+            input = torch.nn.functional.pad(input, (num_pads, 0))
+            output = torch.stft(
+                input,
+                n_fft=self.n_fft,
+                win_length=self.win_length,
+                hop_length=self.hop_length,
+                center=False,
+                pad_mode=self.pad_mode,
+                normalized=self.normalized,
+                onesided=self.onesided,
+                return_complex=False
+            )
+
+        # output: (Batch, Freq, Frames, 2=real_imag)
+        # -> (Batch, Frames, Freq, 2=real_imag)
+        output = output.transpose(1, 2)
+        if multi_channel:
+            # output: (Batch * Channel, Frames, Freq, 2=real_imag)
+            # -> (Batch, Frame, Channel, Freq, 2=real_imag)
+            output = output.view(bs, -1, output.size(1), output.size(2), 2).transpose(
+                1, 2
+            )
+
+        if ilens is not None:
+            if self.center:
+                pad = self.win_length // 2
+                ilens = ilens + 2 * pad
+            olens = torch.div(ilens - self.win_length, self.hop_length, rounding_mode='floor') + 1
+            # olens = ilens - self.win_length // self.hop_length + 1
+            output.masked_fill_(make_pad_mask(olens, output, 1), 0.0)
+        else:
+            olens = None
+
+        return output, olens

ppg_extractor/utterance_mvn.py

@@ -0,0 +1,82 @@
+from typing import Tuple
+
+import torch
+
+from .nets_utils import make_pad_mask
+
+
+class UtteranceMVN(torch.nn.Module):
+    def __init__(
+        self, norm_means: bool = True, norm_vars: bool = False, eps: float = 1.0e-20,
+    ):
+        super().__init__()
+        self.norm_means = norm_means
+        self.norm_vars = norm_vars
+        self.eps = eps
+
+    def extra_repr(self):
+        return f"norm_means={self.norm_means}, norm_vars={self.norm_vars}"
+
+    def forward(
+        self, x: torch.Tensor, ilens: torch.Tensor = None
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """Forward function
+
+        Args:
+            x: (B, L, ...)
+            ilens: (B,)
+
+        """
+        return utterance_mvn(
+            x,
+            ilens,
+            norm_means=self.norm_means,
+            norm_vars=self.norm_vars,
+            eps=self.eps,
+        )
+
+
+def utterance_mvn(
+    x: torch.Tensor,
+    ilens: torch.Tensor = None,
+    norm_means: bool = True,
+    norm_vars: bool = False,
+    eps: float = 1.0e-20,
+) -> Tuple[torch.Tensor, torch.Tensor]:
+    """Apply utterance mean and variance normalization
+
+    Args:
+        x: (B, T, D), assumed zero padded
+        ilens: (B,)
+        norm_means:
+        norm_vars:
+        eps:
+
+    """
+    if ilens is None:
+        ilens = x.new_full([x.size(0)], x.size(1))
+    ilens_ = ilens.to(x.device, x.dtype).view(-1, *[1 for _ in range(x.dim() - 1)])
+    # Zero padding
+    if x.requires_grad:
+        x = x.masked_fill(make_pad_mask(ilens, x, 1), 0.0)
+    else:
+        x.masked_fill_(make_pad_mask(ilens, x, 1), 0.0)
+    # mean: (B, 1, D)
+    mean = x.sum(dim=1, keepdim=True) / ilens_
+
+    if norm_means:
+        x -= mean
+
+        if norm_vars:
+            var = x.pow(2).sum(dim=1, keepdim=True) / ilens_
+            std = torch.clamp(var.sqrt(), min=eps)
+            x = x / std.sqrt()
+        return x, ilens
+    else:
+        if norm_vars:
+            y = x - mean
+            y.masked_fill_(make_pad_mask(ilens, y, 1), 0.0)
+            var = y.pow(2).sum(dim=1, keepdim=True) / ilens_
+            std = torch.clamp(var.sqrt(), min=eps)
+            x /= std
+        return x, ilens

pre4ppg.py

@@ -0,0 +1,49 @@
+from pathlib import Path
+import argparse
+
+from ppg2mel.preprocess import preprocess_dataset
+from pathlib import Path
+import argparse
+
+recognized_datasets = [
+    "aidatatang_200zh",
+    "aidatatang_200zh_s", #      sample 
+]
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description="Preprocesses audio files from datasets, to be used by the "
+                    "ppg2mel model for training.",
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter
+    )
+    parser.add_argument("datasets_root", type=Path, help=\
+        "Path to the directory containing your datasets.")
+    parser.add_argument("-d", "--dataset", type=str, default="aidatatang_200zh", help=\
+        "Name of the dataset to process, allowing values: aidatatang_200zh.")
+    parser.add_argument("-o", "--out_dir", type=Path, default=argparse.SUPPRESS, help=\
+        "Path to the output directory that will contain the mel spectrograms, the audios and the "
+        "embeds. Defaults to <datasets_root>/PPGVC/ppg2mel/")
+    parser.add_argument("-n", "--n_processes", type=int, default=8, help=\
+        "Number of processes in parallel.")
+    # parser.add_argument("-s", "--skip_existing", action="store_true", help=\
+    #     "Whether to overwrite existing files with the same name. Useful if the preprocessing was "
+    #     "interrupted. ")
+    # parser.add_argument("--hparams", type=str, default="", help=\
+    #     "Hyperparameter overrides as a comma-separated list of name-value pairs")
+    # parser.add_argument("--no_trim", action="store_true", help=\
+    #     "Preprocess audio without trimming silences (not recommended).")
+    parser.add_argument("-pf", "--ppg_encoder_model_fpath", type=Path, default="ppg_extractor/saved_models/24epoch.pt", help=\
+        "Path your trained ppg encoder model.")
+    parser.add_argument("-sf", "--speaker_encoder_model", type=Path, default="encoder/saved_models/pretrained_bak_5805000.pt", help=\
+        "Path your trained speaker encoder model.")
+    args = parser.parse_args()
+
+    assert args.dataset in recognized_datasets, 'is not supported, file a issue to propose a new one'
+
+    # Create directories
+    assert args.datasets_root.exists()
+    if not hasattr(args, "out_dir"):
+        args.out_dir = args.datasets_root.joinpath("PPGVC", "ppg2mel")
+    args.out_dir.mkdir(exist_ok=True, parents=True)
+
+    preprocess_dataset(**vars(args)) 

requirements.txt

@@ -17,7 +17,10 @@ webrtcvad; platform_system != "Windows"
 pypinyin
 flask
 flask_wtf
-flask_cors
+flask_cors==3.0.10
 gevent==21.8.0
 flask_restx
 tensorboard
+PyYAML==5.4.1
+torch_complex
+espnet

run.py

@@ -0,0 +1,142 @@
+import time
+import os
+import argparse
+import torch
+import numpy as np
+import glob
+from pathlib import Path
+from tqdm import tqdm
+from ppg_extractor import load_model
+import librosa
+import soundfile as sf
+from utils.load_yaml import HpsYaml
+
+from encoder.audio import preprocess_wav
+from encoder import inference as speacker_encoder
+from vocoder.hifigan import inference as vocoder
+from ppg2mel import MelDecoderMOLv2
+from utils.f0_utils import compute_f0, f02lf0, compute_mean_std, get_converted_lf0uv
+
+
+def _build_ppg2mel_model(model_config, model_file, device):
+    ppg2mel_model = MelDecoderMOLv2(
+        **model_config["model"]
+    ).to(device)
+    ckpt = torch.load(model_file, map_location=device)
+    ppg2mel_model.load_state_dict(ckpt["model"])
+    ppg2mel_model.eval()
+    return ppg2mel_model
+
+
+@torch.no_grad()
+def convert(args):
+    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+    output_dir = args.output_dir
+    os.makedirs(output_dir, exist_ok=True)
+
+    step = os.path.basename(args.ppg2mel_model_file)[:-4].split("_")[-1]
+
+    # Build models
+    print("Load PPG-model, PPG2Mel-model, Vocoder-model...")
+    ppg_model = load_model(
+        Path('./ppg_extractor/saved_models/24epoch.pt'),
+        device,
+    )
+    ppg2mel_model = _build_ppg2mel_model(HpsYaml(args.ppg2mel_model_train_config), args.ppg2mel_model_file, device) 
+    # vocoder.load_model('./vocoder/saved_models/pretrained/g_hifigan.pt', "./vocoder/hifigan/config_16k_.json")
+    vocoder.load_model('./vocoder/saved_models/24k/g_02830000.pt')
+    # Data related
+    ref_wav_path = args.ref_wav_path
+    ref_wav = preprocess_wav(ref_wav_path)
+    ref_fid = os.path.basename(ref_wav_path)[:-4]
+    
+    # TODO: specify encoder
+    speacker_encoder.load_model(Path("encoder/saved_models/pretrained_bak_5805000.pt"))
+    ref_spk_dvec = speacker_encoder.embed_utterance(ref_wav)
+    ref_spk_dvec = torch.from_numpy(ref_spk_dvec).unsqueeze(0).to(device)
+    ref_lf0_mean, ref_lf0_std = compute_mean_std(f02lf0(compute_f0(ref_wav)))
+    
+    source_file_list = sorted(glob.glob(f"{args.wav_dir}/*.wav"))
+    print(f"Number of source utterances: {len(source_file_list)}.")
+    
+    total_rtf = 0.0
+    cnt = 0
+    for src_wav_path in tqdm(source_file_list):
+        # Load the audio to a numpy array:
+        src_wav, _ = librosa.load(src_wav_path, sr=16000)
+        src_wav_tensor = torch.from_numpy(src_wav).unsqueeze(0).float().to(device)
+        src_wav_lengths = torch.LongTensor([len(src_wav)]).to(device)
+        ppg = ppg_model(src_wav_tensor, src_wav_lengths)
+
+        lf0_uv = get_converted_lf0uv(src_wav, ref_lf0_mean, ref_lf0_std, convert=True)
+        min_len = min(ppg.shape[1], len(lf0_uv))
+
+        ppg = ppg[:, :min_len]
+        lf0_uv = lf0_uv[:min_len]
+        
+        start = time.time()
+        _, mel_pred, att_ws = ppg2mel_model.inference(
+            ppg,
+            logf0_uv=torch.from_numpy(lf0_uv).unsqueeze(0).float().to(device),
+            spembs=ref_spk_dvec,
+        )
+        src_fid = os.path.basename(src_wav_path)[:-4]
+        wav_fname = f"{output_dir}/vc_{src_fid}_ref_{ref_fid}_step{step}.wav"
+        mel_len = mel_pred.shape[0]
+        rtf = (time.time() - start) / (0.01 * mel_len)
+        total_rtf += rtf
+        cnt += 1
+        # continue
+        mel_pred= mel_pred.transpose(0, 1)
+        y, output_sample_rate = vocoder.infer_waveform(mel_pred.cpu())
+        sf.write(wav_fname, y.squeeze(), output_sample_rate, "PCM_16")
+    
+    print("RTF:")
+    print(total_rtf / cnt)
+
+
+def get_parser():
+    parser = argparse.ArgumentParser(description="Conversion from wave input")
+    parser.add_argument(
+        "--wav_dir",
+        type=str,
+        default=None,
+        required=True,
+        help="Source wave directory.",
+    )
+    parser.add_argument(
+        "--ref_wav_path",
+        type=str,
+        required=True,
+        help="Reference wave file path.",
+    )
+    parser.add_argument(
+        "--ppg2mel_model_train_config", "-c",
+        type=str,
+        default=None,
+        required=True,
+        help="Training config file (yaml file)",
+    )
+    parser.add_argument(
+        "--ppg2mel_model_file", "-m",
+        type=str,
+        default=None,
+        required=True,
+        help="ppg2mel model checkpoint file path"
+    )
+    parser.add_argument(
+        "--output_dir", "-o",
+        type=str,
+        default="vc_gens_vctk_oneshot",
+        help="Output folder to save the converted wave."
+    )
+    
+    return parser
+
+def main():
+    parser = get_parser()
+    args = parser.parse_args()
+    convert(args)
+
+if __name__ == "__main__":
+    main()

toolbox/__init__.py

@@ -3,16 +3,17 @@ from encoder import inference as encoder
 from synthesizer.inference import Synthesizer
 from vocoder.wavernn import inference as rnn_vocoder
 from vocoder.hifigan import inference as gan_vocoder
+import ppg_extractor as extractor
+import ppg2mel as convertor
 from pathlib import Path
 from time import perf_counter as timer
 from toolbox.utterance import Utterance
+from utils.f0_utils import compute_f0, f02lf0, compute_mean_std, get_converted_lf0uv
 import numpy as np
 import traceback
 import sys
 import torch
-import librosa
 import re
-from audioread.exceptions import NoBackendError
 
 # 默认使用wavernn
 vocoder = rnn_vocoder
@@ -49,14 +50,20 @@ recognized_datasets = [
 MAX_WAVES = 15
 
 class Toolbox:
-    def __init__(self, datasets_root, enc_models_dir, syn_models_dir, voc_models_dir, seed, no_mp3_support):
+    def __init__(self, datasets_root, enc_models_dir, syn_models_dir, voc_models_dir, extractor_models_dir, convertor_models_dir, seed, no_mp3_support, vc_mode):
         self.no_mp3_support = no_mp3_support
+        self.vc_mode = vc_mode
         sys.excepthook = self.excepthook
         self.datasets_root = datasets_root
         self.utterances = set()
         self.current_generated = (None, None, None, None) # speaker_name, spec, breaks, wav
         
         self.synthesizer = None # type: Synthesizer
+
+        # for ppg-based voice conversion
+        self.extractor = None 
+        self.convertor = None # ppg2mel
+
         self.current_wav = None
         self.waves_list = []
         self.waves_count = 0
@@ -70,9 +77,9 @@ class Toolbox:
             self.trim_silences = False
 
         # Initialize the events and the interface
-        self.ui = UI()
+        self.ui = UI(vc_mode)
         self.style_idx = 0
-        self.reset_ui(enc_models_dir, syn_models_dir, voc_models_dir, seed)
+        self.reset_ui(enc_models_dir, syn_models_dir, voc_models_dir, extractor_models_dir, convertor_models_dir, seed)
         self.setup_events()
         self.ui.start()
 
@@ -96,7 +103,11 @@ class Toolbox:
         self.ui.encoder_box.currentIndexChanged.connect(self.init_encoder)
         def func(): 
             self.synthesizer = None
+        if self.vc_mode:
+            self.ui.extractor_box.currentIndexChanged.connect(self.init_extractor)
+        else:
             self.ui.synthesizer_box.currentIndexChanged.connect(func)
+
         self.ui.vocoder_box.currentIndexChanged.connect(self.init_vocoder)
         
         # Utterance selection
@@ -109,6 +120,11 @@ class Toolbox:
         self.ui.stop_button.clicked.connect(self.ui.stop)
         self.ui.record_button.clicked.connect(self.record)
 
+        # Source Utterance selection
+        if self.vc_mode:
+            func = lambda: self.load_soruce_button(self.ui.selected_utterance)
+            self.ui.load_soruce_button.clicked.connect(func)
+
         #Audio
         self.ui.setup_audio_devices(Synthesizer.sample_rate)
 
@@ -120,11 +136,16 @@ class Toolbox:
         self.ui.waves_cb.currentIndexChanged.connect(self.set_current_wav)
 
         # Generation
+        self.ui.vocode_button.clicked.connect(self.vocode)
+        self.ui.random_seed_checkbox.clicked.connect(self.update_seed_textbox)
+
+        if self.vc_mode:
+            func = lambda: self.convert() or self.vocode()
+            self.ui.convert_button.clicked.connect(func)
+        else:
             func = lambda: self.synthesize() or self.vocode()
             self.ui.generate_button.clicked.connect(func)
             self.ui.synthesize_button.clicked.connect(self.synthesize)
-        self.ui.vocode_button.clicked.connect(self.vocode)
-        self.ui.random_seed_checkbox.clicked.connect(self.update_seed_textbox)
 
         # UMAP legend
         self.ui.clear_button.clicked.connect(self.clear_utterances)
@@ -138,9 +159,9 @@ class Toolbox:
     def replay_last_wav(self):
         self.ui.play(self.current_wav, Synthesizer.sample_rate)
 
-    def reset_ui(self, encoder_models_dir, synthesizer_models_dir, vocoder_models_dir, seed):
+    def reset_ui(self, encoder_models_dir, synthesizer_models_dir, vocoder_models_dir, extractor_models_dir, convertor_models_dir, seed):
         self.ui.populate_browser(self.datasets_root, recognized_datasets, 0, True)
-        self.ui.populate_models(encoder_models_dir, synthesizer_models_dir, vocoder_models_dir)
+        self.ui.populate_models(encoder_models_dir, synthesizer_models_dir, vocoder_models_dir, extractor_models_dir, convertor_models_dir, self.vc_mode)
         self.ui.populate_gen_options(seed, self.trim_silences)
         
     def load_from_browser(self, fpath=None):
@@ -172,6 +193,9 @@ class Toolbox:
 
         self.add_real_utterance(wav, name, speaker_name)
     
+    def load_soruce_button(self, utterance: Utterance):
+        self.selected_source_utterance = utterance
+
     def record(self):
         wav = self.ui.record_one(encoder.sampling_rate, 5)
         if wav is None:
@@ -196,7 +220,7 @@ class Toolbox:
         # Add the utterance
         utterance = Utterance(name, speaker_name, wav, spec, embed, partial_embeds, False)
         self.utterances.add(utterance)
-        self.ui.register_utterance(utterance)
+        self.ui.register_utterance(utterance, self.vc_mode)
 
         # Plot it
         self.ui.draw_embed(embed, name, "current")
@@ -269,7 +293,7 @@ class Toolbox:
             self.ui.set_loading(i, seq_len)
         if self.ui.current_vocoder_fpath is not None:
             self.ui.log("")
-            wav = vocoder.infer_waveform(spec, progress_callback=vocoder_progress)
+            wav, sample_rate = vocoder.infer_waveform(spec, progress_callback=vocoder_progress)
         else:
             self.ui.log("Waveform generation with Griffin-Lim... ")
             wav = Synthesizer.griffin_lim(spec)
@@ -280,7 +304,7 @@ class Toolbox:
         b_ends = np.cumsum(np.array(breaks) * Synthesizer.hparams.hop_size)
         b_starts = np.concatenate(([0], b_ends[:-1]))
         wavs = [wav[start:end] for start, end, in zip(b_starts, b_ends)]
-        breaks = [np.zeros(int(0.15 * Synthesizer.sample_rate))] * len(breaks)
+        breaks = [np.zeros(int(0.15 * sample_rate))] * len(breaks)
         wav = np.concatenate([i for w, b in zip(wavs, breaks) for i in (w, b)])
 
         # Trim excessive silences
@@ -289,7 +313,7 @@ class Toolbox:
 
         # Play it
         wav = wav / np.abs(wav).max() * 0.97
-        self.ui.play(wav, Synthesizer.sample_rate)
+        self.ui.play(wav, sample_rate)
 
         # Name it (history displayed in combobox)
         # TODO better naming for the combobox items?
@@ -331,6 +355,68 @@ class Toolbox:
         self.ui.draw_embed(embed, name, "generated")
         self.ui.draw_umap_projections(self.utterances)
         
+    def convert(self):
+        self.ui.log("Extract PPG and Converting...")
+        self.ui.set_loading(1)
+        
+        # Init
+        if self.convertor is None:
+            self.init_convertor()
+        if self.extractor is None:
+            self.init_extractor()
+        
+        src_wav = self.selected_source_utterance.wav
+
+        # Compute the ppg
+        if not self.extractor is None:
+            ppg = self.extractor.extract_from_wav(src_wav)
+        
+        device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+        ref_wav = self.ui.selected_utterance.wav
+        ref_lf0_mean, ref_lf0_std = compute_mean_std(f02lf0(compute_f0(ref_wav)))
+        lf0_uv = get_converted_lf0uv(src_wav, ref_lf0_mean, ref_lf0_std, convert=True)
+        min_len = min(ppg.shape[1], len(lf0_uv))
+        ppg = ppg[:, :min_len]
+        lf0_uv = lf0_uv[:min_len]
+        _, mel_pred, att_ws = self.convertor.inference(
+            ppg,
+            logf0_uv=torch.from_numpy(lf0_uv).unsqueeze(0).float().to(device),
+            spembs=torch.from_numpy(self.ui.selected_utterance.embed).unsqueeze(0).to(device),
+        )
+        mel_pred= mel_pred.transpose(0, 1)
+        breaks = [mel_pred.shape[1]]
+        mel_pred= mel_pred.detach().cpu().numpy()
+        self.ui.draw_spec(mel_pred, "generated")
+        self.current_generated = (self.ui.selected_utterance.speaker_name, mel_pred, breaks, None)
+        self.ui.set_loading(0)
+
+    def init_extractor(self):
+        if self.ui.current_extractor_fpath is None:
+            return
+        model_fpath = self.ui.current_extractor_fpath
+        self.ui.log("Loading the extractor %s... " % model_fpath)
+        self.ui.set_loading(1)
+        start = timer()
+        self.extractor = extractor.load_model(model_fpath)
+        self.ui.log("Done (%dms)." % int(1000 * (timer() - start)), "append")
+        self.ui.set_loading(0)
+
+    def init_convertor(self):
+        if self.ui.current_convertor_fpath is None:
+            return
+        model_fpath = self.ui.current_convertor_fpath
+        # search a config file
+        model_config_fpaths = list(model_fpath.parent.rglob("*.yaml"))
+        if self.ui.current_convertor_fpath is None:
+            return
+        model_config_fpath = model_config_fpaths[0]
+        self.ui.log("Loading the convertor %s... " % model_fpath)
+        self.ui.set_loading(1)
+        start = timer()
+        self.convertor = convertor.load_model(model_config_fpath, model_fpath)
+        self.ui.log("Done (%dms)." % int(1000 * (timer() - start)), "append")
+        self.ui.set_loading(0)
+        
     def init_encoder(self):
         model_fpath = self.ui.current_encoder_fpath
         
@@ -358,12 +444,16 @@ class Toolbox:
         # Case of Griffin-lim
         if model_fpath is None:
             return 
-        
-
         # Sekect vocoder based on model name
+        model_config_fpath = None
         if model_fpath.name[0] == "g":
             vocoder = gan_vocoder
             self.ui.log("set hifigan as vocoder")
+            # search a config file
+            model_config_fpaths = list(model_fpath.parent.rglob("*.json"))
+            if self.ui.current_extractor_fpath is None:
+                return
+            model_config_fpath = model_config_fpaths[0]
         else:
             vocoder = rnn_vocoder
             self.ui.log("set wavernn as vocoder")
@@ -371,7 +461,7 @@ class Toolbox:
         self.ui.log("Loading the vocoder %s... " % model_fpath)
         self.ui.set_loading(1)
         start = timer()
-        vocoder.load_model(model_fpath)
+        vocoder.load_model(model_fpath, model_config_fpath)
         self.ui.log("Done (%dms)." % int(1000 * (timer() - start)), "append")
         self.ui.set_loading(0)
 

toolbox/ui.py

@@ -326,14 +326,35 @@ class UI(QDialog):
     def current_vocoder_fpath(self):
         return self.vocoder_box.itemData(self.vocoder_box.currentIndex())
 
+    @property
+    def current_extractor_fpath(self):
+        return self.extractor_box.itemData(self.extractor_box.currentIndex())
+
+    @property
+    def current_convertor_fpath(self):
+        return self.convertor_box.itemData(self.convertor_box.currentIndex())
+
     def populate_models(self, encoder_models_dir: Path, synthesizer_models_dir: Path, 
-                        vocoder_models_dir: Path):
+                        vocoder_models_dir: Path, extractor_models_dir: Path, convertor_models_dir: Path, vc_mode: bool):
         # Encoder
         encoder_fpaths = list(encoder_models_dir.glob("*.pt"))
         if len(encoder_fpaths) == 0:
             raise Exception("No encoder models found in %s" % encoder_models_dir)
         self.repopulate_box(self.encoder_box, [(f.stem, f) for f in encoder_fpaths])
         
+        if vc_mode:
+            # Extractor
+            extractor_fpaths = list(extractor_models_dir.glob("*.pt"))
+            if len(extractor_fpaths) == 0:
+                self.log("No extractor models found in %s" % extractor_fpaths)
+            self.repopulate_box(self.extractor_box, [(f.stem, f) for f in extractor_fpaths])
+            
+            # Convertor
+            convertor_fpaths = list(convertor_models_dir.glob("*.pth"))
+            if len(convertor_fpaths) == 0:
+                self.log("No convertor models found in %s" % convertor_fpaths)
+            self.repopulate_box(self.convertor_box, [(f.stem, f) for f in convertor_fpaths])
+        else:
             # Synthesizer
             synthesizer_fpaths = list(synthesizer_models_dir.glob("**/*.pt"))
             if len(synthesizer_fpaths) == 0:
@@ -349,7 +370,7 @@ class UI(QDialog):
     def selected_utterance(self):
         return self.utterance_history.itemData(self.utterance_history.currentIndex())
         
-    def register_utterance(self, utterance: Utterance):
+    def register_utterance(self, utterance: Utterance, vc_mode):
         self.utterance_history.blockSignals(True)
         self.utterance_history.insertItem(0, utterance.name, utterance)
         self.utterance_history.setCurrentIndex(0)
@@ -359,6 +380,9 @@ class UI(QDialog):
             self.utterance_history.removeItem(self.max_saved_utterances)
 
         self.play_button.setDisabled(False)
+        if vc_mode:
+            self.convert_button.setDisabled(False)
+        else:
             self.generate_button.setDisabled(False)
             self.synthesize_button.setDisabled(False)
 
@@ -402,7 +426,7 @@ class UI(QDialog):
         else:
             self.seed_textbox.setEnabled(False)
 
-    def reset_interface(self):
+    def reset_interface(self, vc_mode):
         self.draw_embed(None, None, "current")
         self.draw_embed(None, None, "generated")
         self.draw_spec(None, "current")
@@ -410,6 +434,9 @@ class UI(QDialog):
         self.draw_umap_projections(set())
         self.set_loading(0)
         self.play_button.setDisabled(True)
+        if vc_mode:
+            self.convert_button.setDisabled(True)
+        else:
             self.generate_button.setDisabled(True)
             self.synthesize_button.setDisabled(True)
         self.vocode_button.setDisabled(True)
@@ -417,7 +444,7 @@ class UI(QDialog):
         self.export_wav_button.setDisabled(True)
         [self.log("") for _ in range(self.max_log_lines)]
 
-    def __init__(self):
+    def __init__(self, vc_mode):
         ## Initialize the application
         self.app = QApplication(sys.argv)
         super().__init__(None)
@@ -469,7 +496,7 @@ class UI(QDialog):
         source_groupbox = QGroupBox('Source(源音频)')
         source_layout = QGridLayout()
         source_groupbox.setLayout(source_layout)
-        browser_layout.addWidget(source_groupbox, i, 0, 1, 4)
+        browser_layout.addWidget(source_groupbox, i, 0, 1, 5)
 
         self.dataset_box = QComboBox()
         source_layout.addWidget(QLabel("Dataset(数据集):"), i, 0)
@@ -510,25 +537,35 @@ class UI(QDialog):
         browser_layout.addWidget(self.play_button, i, 2)
         self.stop_button = QPushButton("Stop(暂停)")
         browser_layout.addWidget(self.stop_button, i, 3)
+        if vc_mode:
+            self.load_soruce_button = QPushButton("Select(选择为被转换的语音输入)")
+            browser_layout.addWidget(self.load_soruce_button, i, 4)
 
         i += 1
         model_groupbox = QGroupBox('Models(模型选择)')
         model_layout = QHBoxLayout()
         model_groupbox.setLayout(model_layout)
-        browser_layout.addWidget(model_groupbox, i, 0, 1, 4)
+        browser_layout.addWidget(model_groupbox, i, 0, 2, 5)
 
         # Model and audio output selection
         self.encoder_box = QComboBox()
         model_layout.addWidget(QLabel("Encoder:"))
         model_layout.addWidget(self.encoder_box)
         self.synthesizer_box = QComboBox()
+        if vc_mode:
+            self.extractor_box = QComboBox()
+            model_layout.addWidget(QLabel("Extractor:"))
+            model_layout.addWidget(self.extractor_box)
+            self.convertor_box = QComboBox()
+            model_layout.addWidget(QLabel("Convertor:"))
+            model_layout.addWidget(self.convertor_box)
+        else:
             model_layout.addWidget(QLabel("Synthesizer:"))
             model_layout.addWidget(self.synthesizer_box)
         self.vocoder_box = QComboBox()
         model_layout.addWidget(QLabel("Vocoder:"))
         model_layout.addWidget(self.vocoder_box)
     
-
         #Replay & Save Audio
         i = 0
         output_layout.addWidget(QLabel("<b>Toolbox Output:</b>"), i, 0)
@@ -550,7 +587,7 @@ class UI(QDialog):
 
         ## Embed & spectrograms
         vis_layout.addStretch()
-
+        # TODO: add spectrograms for source
         gridspec_kw = {"width_ratios": [1, 4]}
         fig, self.current_ax = plt.subplots(1, 2, figsize=(10, 2.25), facecolor="#F0F0F0", 
                                             gridspec_kw=gridspec_kw)
@@ -571,16 +608,23 @@ class UI(QDialog):
         self.text_prompt = QPlainTextEdit(default_text)
         gen_layout.addWidget(self.text_prompt, stretch=1)
         
+        if vc_mode:
+            layout = QHBoxLayout()
+            self.convert_button = QPushButton("Extract and Convert")
+            layout.addWidget(self.convert_button)
+            gen_layout.addLayout(layout)
+        else:
             self.generate_button = QPushButton("Synthesize and vocode")
             gen_layout.addWidget(self.generate_button)
-        
             layout = QHBoxLayout()
             self.synthesize_button = QPushButton("Synthesize only")
             layout.addWidget(self.synthesize_button)
+
         self.vocode_button = QPushButton("Vocode only")
         layout.addWidget(self.vocode_button)
         gen_layout.addLayout(layout)
 
+
         layout_seed = QGridLayout()
         self.random_seed_checkbox = QCheckBox("Random seed:")
         self.random_seed_checkbox.setToolTip("When checked, makes the synthesizer and vocoder deterministic.")
@@ -648,7 +692,7 @@ class UI(QDialog):
         self.resize(max_size)
         
         ## Finalize the display
-        self.reset_interface()
+        self.reset_interface(vc_mode)
         self.show()
 
     def start(self):

train.py

@@ -0,0 +1,67 @@
+import sys
+import torch
+import argparse
+import numpy as np
+from utils.load_yaml import HpsYaml
+from ppg2mel.train.train_linglf02mel_seq2seq_oneshotvc import Solver
+
+# For reproducibility, comment these may speed up training
+torch.backends.cudnn.deterministic = True
+torch.backends.cudnn.benchmark = False
+
+def main():
+    # Arguments
+    parser = argparse.ArgumentParser(description=
+            'Training PPG2Mel VC model.')
+    parser.add_argument('--config', type=str, 
+                        help='Path to experiment config, e.g., config/vc.yaml')
+    parser.add_argument('--name', default=None, type=str, help='Name for logging.')
+    parser.add_argument('--logdir', default='log/', type=str,
+                        help='Logging path.', required=False)
+    parser.add_argument('--ckpdir', default='ppg2mel/saved_models/', type=str,
+                        help='Checkpoint path.', required=False)
+    parser.add_argument('--outdir', default='result/', type=str,
+                        help='Decode output path.', required=False)
+    parser.add_argument('--load', default=None, type=str,
+                        help='Load pre-trained model (for training only)', required=False)
+    parser.add_argument('--warm_start', action='store_true',
+                        help='Load model weights only, ignore specified layers.')
+    parser.add_argument('--seed', default=0, type=int,
+                        help='Random seed for reproducable results.', required=False)
+    parser.add_argument('--njobs', default=8, type=int,
+                        help='Number of threads for dataloader/decoding.', required=False)
+    parser.add_argument('--cpu', action='store_true', help='Disable GPU training.')
+    parser.add_argument('--no-pin', action='store_true',
+                        help='Disable pin-memory for dataloader')
+    parser.add_argument('--test', action='store_true', help='Test the model.')
+    parser.add_argument('--no-msg', action='store_true', help='Hide all messages.')
+    parser.add_argument('--finetune', action='store_true', help='Finetune model')
+    parser.add_argument('--oneshotvc', action='store_true', help='Oneshot VC model')
+    parser.add_argument('--bilstm', action='store_true', help='BiLSTM VC model')
+    parser.add_argument('--lsa', action='store_true', help='Use location-sensitive attention (LSA)')
+
+    ###
+
+    paras = parser.parse_args()
+    setattr(paras, 'gpu', not paras.cpu)
+    setattr(paras, 'pin_memory', not paras.no_pin)
+    setattr(paras, 'verbose', not paras.no_msg)
+    # Make the config dict dot visitable
+    config = HpsYaml(paras.config)
+
+    np.random.seed(paras.seed)
+    torch.manual_seed(paras.seed)
+    if torch.cuda.is_available():
+        torch.cuda.manual_seed_all(paras.seed)
+
+    print(">>> OneShot VC training ...")
+    mode = "train"
+    solver = Solver(config, paras, mode)
+    solver.load_data()
+    solver.set_model()
+    solver.exec()
+    print(">>> Oneshot VC train finished!")
+    sys.exit(0)
+
+if __name__ == "__main__":
+    main()   

utils/audio_utils.py

@@ -0,0 +1,60 @@
+
+import torch
+import torch.utils.data
+from scipy.io.wavfile import read
+from librosa.filters import mel as librosa_mel_fn
+
+MAX_WAV_VALUE = 32768.0
+
+
+def load_wav(full_path):
+    sampling_rate, data = read(full_path)
+    return data, sampling_rate
+
+def _dynamic_range_compression_torch(x, C=1, clip_val=1e-5):
+    return torch.log(torch.clamp(x, min=clip_val) * C)
+
+
+def _spectral_normalize_torch(magnitudes):
+    output = _dynamic_range_compression_torch(magnitudes)
+    return output
+
+mel_basis = {}
+hann_window = {}
+
+def mel_spectrogram(
+    y, 
+    n_fft, 
+    num_mels, 
+    sampling_rate, 
+    hop_size, 
+    win_size, 
+    fmin, 
+    fmax, 
+    center=False,
+    output_energy=False,
+):
+    if torch.min(y) < -1.:
+        print('min value is ', torch.min(y))
+    if torch.max(y) > 1.:
+        print('max value is ', torch.max(y))
+
+    global mel_basis, hann_window
+    if fmax not in mel_basis:
+        mel = librosa_mel_fn(sampling_rate, n_fft, num_mels, fmin, fmax)
+        mel_basis[str(fmax)+'_'+str(y.device)] = torch.from_numpy(mel).float().to(y.device)
+        hann_window[str(y.device)] = torch.hann_window(win_size).to(y.device)
+
+    y = torch.nn.functional.pad(y.unsqueeze(1), (int((n_fft-hop_size)/2), int((n_fft-hop_size)/2)), mode='reflect')
+    y = y.squeeze(1)
+
+    spec = torch.stft(y, n_fft, hop_length=hop_size, win_length=win_size, window=hann_window[str(y.device)],
+                      center=center, pad_mode='reflect', normalized=False, onesided=True, return_complex=False)
+    spec = torch.sqrt(spec.pow(2).sum(-1)+(1e-9))
+    mel_spec = torch.matmul(mel_basis[str(fmax)+'_'+str(y.device)], spec)
+    mel_spec = _spectral_normalize_torch(mel_spec)
+    if output_energy:
+        energy = torch.norm(spec, dim=1)
+        return mel_spec, energy
+    else:
+        return mel_spec

utils/data_load.py

@@ -0,0 +1,214 @@
+import random
+import numpy as np
+import torch
+from utils.f0_utils import get_cont_lf0
+import resampy
+from .audio_utils import MAX_WAV_VALUE, load_wav, mel_spectrogram
+from librosa.util import normalize
+import os
+
+
+SAMPLE_RATE=16000
+
+def read_fids(fid_list_f):
+    with open(fid_list_f, 'r') as f:
+        fids = [l.strip().split()[0] for l in f if l.strip()]
+    return fids   
+
+class OneshotVcDataset(torch.utils.data.Dataset):
+    def __init__(
+        self,
+        meta_file: str,
+        vctk_ppg_dir: str,
+        libri_ppg_dir: str,
+        vctk_f0_dir: str,
+        libri_f0_dir: str,
+        vctk_wav_dir: str,
+        libri_wav_dir: str,
+        vctk_spk_dvec_dir: str,
+        libri_spk_dvec_dir: str,
+        min_max_norm_mel: bool = False,
+        mel_min: float = None,
+        mel_max: float = None,
+        ppg_file_ext: str = "ling_feat.npy",
+        f0_file_ext: str = "f0.npy",
+        wav_file_ext: str = "wav",
+    ):
+        self.fid_list = read_fids(meta_file)
+        self.vctk_ppg_dir = vctk_ppg_dir
+        self.libri_ppg_dir = libri_ppg_dir
+        self.vctk_f0_dir = vctk_f0_dir
+        self.libri_f0_dir = libri_f0_dir
+        self.vctk_wav_dir = vctk_wav_dir
+        self.libri_wav_dir = libri_wav_dir
+        self.vctk_spk_dvec_dir = vctk_spk_dvec_dir
+        self.libri_spk_dvec_dir = libri_spk_dvec_dir
+
+        self.ppg_file_ext = ppg_file_ext
+        self.f0_file_ext = f0_file_ext
+        self.wav_file_ext = wav_file_ext
+
+        self.min_max_norm_mel = min_max_norm_mel
+        if min_max_norm_mel:
+            print("[INFO] Min-Max normalize Melspec.")
+            assert mel_min is not None
+            assert mel_max is not None
+            self.mel_max = mel_max
+            self.mel_min = mel_min
+        
+        random.seed(1234)
+        random.shuffle(self.fid_list)
+        print(f'[INFO] Got {len(self.fid_list)} samples.')
+        
+    def __len__(self):
+        return len(self.fid_list)
+    
+    def get_spk_dvec(self, fid):
+        spk_name = fid
+        if spk_name.startswith("p"):
+            spk_dvec_path = f"{self.vctk_spk_dvec_dir}{os.sep}{spk_name}.npy"
+        else:
+            spk_dvec_path = f"{self.libri_spk_dvec_dir}{os.sep}{spk_name}.npy"
+        return torch.from_numpy(np.load(spk_dvec_path))
+    
+    def compute_mel(self, wav_path):
+        audio, sr = load_wav(wav_path)
+        if sr != SAMPLE_RATE:
+            audio = resampy.resample(audio, sr, SAMPLE_RATE)
+        audio = audio / MAX_WAV_VALUE
+        audio = normalize(audio) * 0.95
+        audio = torch.FloatTensor(audio).unsqueeze(0)
+        melspec = mel_spectrogram(
+            audio,
+            n_fft=1024,
+            num_mels=80,
+            sampling_rate=SAMPLE_RATE,
+            hop_size=160,
+            win_size=1024,
+            fmin=80,
+            fmax=8000,
+        )
+        return melspec.squeeze(0).numpy().T
+
+    def bin_level_min_max_norm(self, melspec):
+        # frequency bin level min-max normalization to [-4, 4]
+        mel = (melspec - self.mel_min) / (self.mel_max - self.mel_min) * 8.0 - 4.0
+        return np.clip(mel, -4., 4.)   
+
+    def __getitem__(self, index):
+        fid = self.fid_list[index]
+        
+        # 1. Load features
+        if fid.startswith("p"):
+            # vctk
+            sub = fid.split("_")[0]
+            ppg = np.load(f"{self.vctk_ppg_dir}{os.sep}{fid}.{self.ppg_file_ext}")
+            f0 = np.load(f"{self.vctk_f0_dir}{os.sep}{fid}.{self.f0_file_ext}")
+            mel = self.compute_mel(f"{self.vctk_wav_dir}{os.sep}{sub}{os.sep}{fid}.{self.wav_file_ext}")
+        else:
+            # aidatatang
+            sub = fid[5:10]
+            ppg = np.load(f"{self.libri_ppg_dir}{os.sep}{fid}.{self.ppg_file_ext}")
+            f0 = np.load(f"{self.libri_f0_dir}{os.sep}{fid}.{self.f0_file_ext}")
+            mel = self.compute_mel(f"{self.libri_wav_dir}{os.sep}{sub}{os.sep}{fid}.{self.wav_file_ext}")
+        if self.min_max_norm_mel:
+            mel = self.bin_level_min_max_norm(mel)
+        
+        f0, ppg, mel = self._adjust_lengths(f0, ppg, mel, fid)
+        spk_dvec = self.get_spk_dvec(fid)
+
+        # 2. Convert f0 to continuous log-f0 and u/v flags
+        uv, cont_lf0 = get_cont_lf0(f0, 10.0, False)
+        # cont_lf0 = (cont_lf0 - np.amin(cont_lf0)) / (np.amax(cont_lf0) - np.amin(cont_lf0))
+        # cont_lf0 = self.utt_mvn(cont_lf0)
+        lf0_uv = np.concatenate([cont_lf0[:, np.newaxis], uv[:, np.newaxis]], axis=1)
+
+        # uv, cont_f0 = convert_continuous_f0(f0)
+        # cont_f0 = (cont_f0 - np.amin(cont_f0)) / (np.amax(cont_f0) - np.amin(cont_f0))
+        # lf0_uv = np.concatenate([cont_f0[:, np.newaxis], uv[:, np.newaxis]], axis=1)
+        
+        # 3. Convert numpy array to torch.tensor
+        ppg = torch.from_numpy(ppg)
+        lf0_uv = torch.from_numpy(lf0_uv)
+        mel = torch.from_numpy(mel)
+        
+        return (ppg, lf0_uv, mel, spk_dvec, fid)
+
+    def check_lengths(self, f0, ppg, mel, fid):
+        LEN_THRESH = 10
+        assert abs(len(ppg) - len(f0)) <= LEN_THRESH, \
+            f"{abs(len(ppg) - len(f0))}: for file {fid}"
+        assert abs(len(mel) - len(f0)) <= LEN_THRESH, \
+            f"{abs(len(mel) - len(f0))}: for file {fid}"
+    
+    def _adjust_lengths(self, f0, ppg, mel, fid):
+        self.check_lengths(f0, ppg, mel, fid)
+        min_len = min(
+            len(f0),
+            len(ppg),
+            len(mel),
+        )
+        f0 = f0[:min_len]
+        ppg = ppg[:min_len]
+        mel = mel[:min_len]
+        return f0, ppg, mel
+
+class MultiSpkVcCollate():
+    """Zero-pads model inputs and targets based on number of frames per step
+    """
+    def __init__(self, n_frames_per_step=1, give_uttids=False,
+                 f02ppg_length_ratio=1, use_spk_dvec=False):
+        self.n_frames_per_step = n_frames_per_step
+        self.give_uttids = give_uttids
+        self.f02ppg_length_ratio = f02ppg_length_ratio
+        self.use_spk_dvec = use_spk_dvec
+
+    def __call__(self, batch):
+        batch_size = len(batch)              
+        # Prepare different features 
+        ppgs = [x[0] for x in batch]
+        lf0_uvs = [x[1] for x in batch]
+        mels = [x[2] for x in batch]
+        fids = [x[-1] for x in batch]
+        if len(batch[0]) == 5:
+            spk_ids = [x[3] for x in batch]
+            if self.use_spk_dvec:
+                # use d-vector
+                spk_ids = torch.stack(spk_ids).float()
+            else:
+                # use one-hot ids
+                spk_ids = torch.LongTensor(spk_ids)
+        # Pad features into chunk
+        ppg_lengths = [x.shape[0] for x in ppgs]
+        mel_lengths = [x.shape[0] for x in mels]
+        max_ppg_len = max(ppg_lengths)
+        max_mel_len = max(mel_lengths)
+        if max_mel_len % self.n_frames_per_step != 0:
+            max_mel_len += (self.n_frames_per_step - max_mel_len % self.n_frames_per_step)
+        ppg_dim = ppgs[0].shape[1]
+        mel_dim = mels[0].shape[1]
+        ppgs_padded = torch.FloatTensor(batch_size, max_ppg_len, ppg_dim).zero_()
+        mels_padded = torch.FloatTensor(batch_size, max_mel_len, mel_dim).zero_()
+        lf0_uvs_padded = torch.FloatTensor(batch_size, self.f02ppg_length_ratio * max_ppg_len, 2).zero_()
+        stop_tokens = torch.FloatTensor(batch_size, max_mel_len).zero_()
+        for i in range(batch_size):
+            cur_ppg_len = ppgs[i].shape[0]
+            cur_mel_len = mels[i].shape[0]
+            ppgs_padded[i, :cur_ppg_len, :] = ppgs[i]
+            lf0_uvs_padded[i, :self.f02ppg_length_ratio*cur_ppg_len, :] = lf0_uvs[i]
+            mels_padded[i, :cur_mel_len, :] = mels[i]
+            stop_tokens[i, cur_ppg_len-self.n_frames_per_step:] = 1
+        if len(batch[0]) == 5:
+            ret_tup = (ppgs_padded, lf0_uvs_padded, mels_padded, torch.LongTensor(ppg_lengths), \
+                torch.LongTensor(mel_lengths), spk_ids, stop_tokens)
+            if self.give_uttids:
+                return ret_tup + (fids, )
+            else:
+                return ret_tup
+        else:
+            ret_tup = (ppgs_padded, lf0_uvs_padded, mels_padded, torch.LongTensor(ppg_lengths), \
+                torch.LongTensor(mel_lengths), stop_tokens)
+            if self.give_uttids:
+                return ret_tup + (fids, )
+            else:
+                return ret_tup

utils/f0_utils.py

@@ -0,0 +1,124 @@
+import logging
+import numpy as np
+import pyworld
+from scipy.interpolate import interp1d
+from scipy.signal import firwin, get_window, lfilter
+
+def compute_mean_std(lf0):
+    nonzero_indices = np.nonzero(lf0)
+    mean = np.mean(lf0[nonzero_indices])
+    std = np.std(lf0[nonzero_indices])
+    return mean, std 
+
+
+def compute_f0(wav, sr=16000, frame_period=10.0):
+    """Compute f0 from wav using pyworld harvest algorithm."""
+    wav = wav.astype(np.float64)
+    f0, _ = pyworld.harvest(
+        wav, sr, frame_period=frame_period, f0_floor=80.0, f0_ceil=600.0)
+    return f0.astype(np.float32)
+
+def f02lf0(f0):
+    lf0 = f0.copy()
+    nonzero_indices = np.nonzero(f0)
+    lf0[nonzero_indices] = np.log(f0[nonzero_indices])
+    return lf0
+
+def get_converted_lf0uv(
+    wav, 
+    lf0_mean_trg, 
+    lf0_std_trg,
+    convert=True,
+):
+    f0_src = compute_f0(wav)
+    if not convert:
+        uv, cont_lf0 = get_cont_lf0(f0_src)
+        lf0_uv = np.concatenate([cont_lf0[:, np.newaxis], uv[:, np.newaxis]], axis=1)
+        return lf0_uv
+
+    lf0_src = f02lf0(f0_src)
+    lf0_mean_src, lf0_std_src = compute_mean_std(lf0_src)
+    
+    lf0_vc = lf0_src.copy()
+    lf0_vc[lf0_src > 0.0] = (lf0_src[lf0_src > 0.0] - lf0_mean_src) / lf0_std_src * lf0_std_trg + lf0_mean_trg
+    f0_vc = lf0_vc.copy()
+    f0_vc[lf0_src > 0.0] = np.exp(lf0_vc[lf0_src > 0.0])
+    
+    uv, cont_lf0_vc = get_cont_lf0(f0_vc)
+    lf0_uv = np.concatenate([cont_lf0_vc[:, np.newaxis], uv[:, np.newaxis]], axis=1)
+    return lf0_uv
+
+def low_pass_filter(x, fs, cutoff=70, padding=True):
+    """FUNCTION TO APPLY LOW PASS FILTER
+
+    Args:
+        x (ndarray): Waveform sequence
+        fs (int): Sampling frequency
+        cutoff (float): Cutoff frequency of low pass filter
+
+    Return:
+        (ndarray): Low pass filtered waveform sequence
+    """
+
+    nyquist = fs // 2
+    norm_cutoff = cutoff / nyquist
+
+    # low cut filter
+    numtaps = 255
+    fil = firwin(numtaps, norm_cutoff)
+    x_pad = np.pad(x, (numtaps, numtaps), 'edge')
+    lpf_x = lfilter(fil, 1, x_pad)
+    lpf_x = lpf_x[numtaps + numtaps // 2: -numtaps // 2]
+
+    return lpf_x
+
+
+def convert_continuos_f0(f0):
+    """CONVERT F0 TO CONTINUOUS F0
+
+    Args:
+        f0 (ndarray): original f0 sequence with the shape (T)
+
+    Return:
+        (ndarray): continuous f0 with the shape (T)
+    """
+    # get uv information as binary
+    uv = np.float32(f0 != 0)
+
+    # get start and end of f0
+    if (f0 == 0).all():
+        logging.warn("all of the f0 values are 0.")
+        return uv, f0
+    start_f0 = f0[f0 != 0][0]
+    end_f0 = f0[f0 != 0][-1]
+
+    # padding start and end of f0 sequence
+    start_idx = np.where(f0 == start_f0)[0][0]
+    end_idx = np.where(f0 == end_f0)[0][-1]
+    f0[:start_idx] = start_f0
+    f0[end_idx:] = end_f0
+
+    # get non-zero frame index
+    nz_frames = np.where(f0 != 0)[0]
+
+    # perform linear interpolation
+    f = interp1d(nz_frames, f0[nz_frames])
+    cont_f0 = f(np.arange(0, f0.shape[0]))
+
+    return uv, cont_f0
+
+
+def get_cont_lf0(f0, frame_period=10.0, lpf=False):
+    uv, cont_f0 = convert_continuos_f0(f0)
+    if lpf:
+        cont_f0_lpf = low_pass_filter(cont_f0, int(1.0 / (frame_period * 0.001)), cutoff=20)
+        cont_lf0_lpf = cont_f0_lpf.copy()
+        nonzero_indices = np.nonzero(cont_lf0_lpf)
+        cont_lf0_lpf[nonzero_indices] = np.log(cont_f0_lpf[nonzero_indices])
+        # cont_lf0_lpf = np.log(cont_f0_lpf)
+        return uv, cont_lf0_lpf 
+    else:
+        nonzero_indices = np.nonzero(cont_f0)
+        cont_lf0 = cont_f0.copy()
+        cont_lf0[cont_f0>0] = np.log(cont_f0[cont_f0>0])
+        return uv, cont_lf0

utils/load_yaml.py

@@ -0,0 +1,58 @@
+import yaml
+
+
+def load_hparams(filename):
+    stream = open(filename, 'r')
+    docs = yaml.safe_load_all(stream)
+    hparams_dict = dict()
+    for doc in docs:
+        for k, v in doc.items():
+            hparams_dict[k] = v
+    return hparams_dict
+
+def merge_dict(user, default):
+    if isinstance(user, dict) and isinstance(default, dict):
+        for k, v in default.items():
+            if k not in user:
+                user[k] = v
+            else:
+                user[k] = merge_dict(user[k], v)
+    return user
+
+class Dotdict(dict):
+    """
+    a dictionary that supports dot notation 
+    as well as dictionary access notation 
+    usage: d = DotDict() or d = DotDict({'val1':'first'})
+    set attributes: d.val2 = 'second' or d['val2'] = 'second'
+    get attributes: d.val2 or d['val2']
+    """
+    __getattr__ = dict.__getitem__
+    __setattr__ = dict.__setitem__
+    __delattr__ = dict.__delitem__
+
+    def __init__(self, dct=None):
+        dct = dict() if not dct else dct
+        for key, value in dct.items():
+            if hasattr(value, 'keys'):
+                value = Dotdict(value)
+            self[key] = value
+
+class HpsYaml(Dotdict):
+    def __init__(self, yaml_file):
+        super(Dotdict, self).__init__()
+        hps = load_hparams(yaml_file)
+        hp_dict = Dotdict(hps)
+        for k, v in hp_dict.items():
+            setattr(self, k, v)
+
+    __getattr__ = Dotdict.__getitem__
+    __setattr__ = Dotdict.__setitem__
+    __delattr__ = Dotdict.__delitem__
+    
+
+
+
+
+
+

utils/util.py

@@ -0,0 +1,44 @@
+import matplotlib
+matplotlib.use('Agg')
+import time
+
+class Timer():
+    ''' Timer for recording training time distribution. '''
+    def __init__(self):
+        self.prev_t = time.time()
+        self.clear()
+
+    def set(self):
+        self.prev_t = time.time()
+
+    def cnt(self, mode):
+        self.time_table[mode] += time.time()-self.prev_t
+        self.set()
+        if mode == 'bw':
+            self.click += 1
+
+    def show(self):
+        total_time = sum(self.time_table.values())
+        self.time_table['avg'] = total_time/self.click
+        self.time_table['rd'] = 100*self.time_table['rd']/total_time
+        self.time_table['fw'] = 100*self.time_table['fw']/total_time
+        self.time_table['bw'] = 100*self.time_table['bw']/total_time
+        msg = '{avg:.3f} sec/step (rd {rd:.1f}% | fw {fw:.1f}% | bw {bw:.1f}%)'.format(
+            **self.time_table)
+        self.clear()
+        return msg
+
+    def clear(self):
+        self.time_table = {'rd': 0, 'fw': 0, 'bw': 0}
+        self.click = 0
+
+# Reference : https://github.com/espnet/espnet/blob/master/espnet/nets/pytorch_backend/e2e_asr.py#L168
+
+def human_format(num):
+    magnitude = 0
+    while num >= 1000:
+        magnitude += 1
+        num /= 1000.0
+    # add more suffixes if you need them
+    return '{:3.1f}{}'.format(num, [' ', 'K', 'M', 'G', 'T', 'P'][magnitude])
+

vocoder/hifigan/inference.py

@@ -3,14 +3,11 @@ from __future__ import absolute_import, division, print_function, unicode_litera
 import os
 import json
 import torch
-from scipy.io.wavfile import write
 from vocoder.hifigan.env import AttrDict
-from vocoder.hifigan.meldataset import mel_spectrogram, MAX_WAV_VALUE, load_wav
 from vocoder.hifigan.models import Generator
-import soundfile as sf
-
 
 generator = None       # type: Generator
+output_sample_rate = None     
 _device = None
 
 
@@ -22,16 +19,17 @@ def load_checkpoint(filepath, device):
     return checkpoint_dict
 
 
-def load_model(weights_fpath, verbose=True):
-    global generator, _device
+def load_model(weights_fpath, config_fpath="./vocoder/saved_models/24k/config.json", verbose=True):
+    global generator, _device, output_sample_rate
 
     if verbose:
         print("Building hifigan")
 
-    with open("./vocoder/hifigan/config_16k_.json") as f:
+    with open(config_fpath) as f:
         data = f.read()
     json_config = json.loads(data)
     h = AttrDict(json_config)
+    output_sample_rate = h.sampling_rate
     torch.manual_seed(h.seed)
 
     if torch.cuda.is_available():
@@ -66,5 +64,5 @@ def infer_waveform(mel, progress_callback=None):
         audio = y_g_hat.squeeze()
     audio = audio.cpu().numpy()
 
-    return audio
+    return audio, output_sample_rate
 

vocoder/hifigan/models.py

@@ -71,6 +71,24 @@ class ResBlock2(torch.nn.Module):
         for l in self.convs:
             remove_weight_norm(l)
 
+class InterpolationBlock(torch.nn.Module):
+    def __init__(self, scale_factor, mode='nearest', align_corners=None, downsample=False):
+        super(InterpolationBlock, self).__init__()
+        self.downsample = downsample
+        self.scale_factor = scale_factor
+        self.mode = mode
+        self.align_corners = align_corners
+    
+    def forward(self, x):
+        outputs = torch.nn.functional.interpolate(
+            x,
+            size=x.shape[-1] * self.scale_factor \
+                if not self.downsample else x.shape[-1] // self.scale_factor,
+            mode=self.mode,
+            align_corners=self.align_corners,
+            recompute_scale_factor=False
+        )
+        return outputs
 
 class Generator(torch.nn.Module):
     def __init__(self, h):
@@ -82,14 +100,27 @@ class Generator(torch.nn.Module):
         resblock = ResBlock1 if h.resblock == '1' else ResBlock2
 
         self.ups = nn.ModuleList()
+#         for i, (u, k) in enumerate(zip(h.upsample_rates, h.upsample_kernel_sizes)):
+# #             self.ups.append(weight_norm(
+# #                 ConvTranspose1d(h.upsample_initial_channel//(2**i), h.upsample_initial_channel//(2**(i+1)),
+# #                                 k, u, padding=(k-u)//2)))
+        if h.sampling_rate == 24000:
+            for i, (u, k) in enumerate(zip(h.upsample_rates, h.upsample_kernel_sizes)):
+                self.ups.append(
+                    torch.nn.Sequential(
+                        InterpolationBlock(u),
+                        weight_norm(torch.nn.Conv1d(
+                            h.upsample_initial_channel//(2**i),
+                            h.upsample_initial_channel//(2**(i+1)),
+                            k, padding=(k-1)//2,
+                        ))
+                    )
+                )
+        else:
             for i, (u, k) in enumerate(zip(h.upsample_rates, h.upsample_kernel_sizes)):
-#             self.ups.append(weight_norm(
-#                 ConvTranspose1d(h.upsample_initial_channel//(2**i), h.upsample_initial_channel//(2**(i+1)),
-#                                 k, u, padding=(k-u)//2)))
                 self.ups.append(weight_norm(ConvTranspose1d(h.upsample_initial_channel//(2**i), 
                     h.upsample_initial_channel//(2**(i+1)),
                     k, u, padding=(u//2 + u%2), output_padding=u%2)))
-
         self.resblocks = nn.ModuleList()
         for i in range(len(self.ups)):
             ch = h.upsample_initial_channel//(2**(i+1))
@@ -121,6 +152,9 @@ class Generator(torch.nn.Module):
     def remove_weight_norm(self):
         print('Removing weight norm...')
         for l in self.ups:
+            if self.h.sampling_rate == 24000:
+                remove_weight_norm(l[-1])
+            else:
                 remove_weight_norm(l)
         for l in self.resblocks:
             l.remove_weight_norm()

vocoder/wavernn/inference.py

@@ -61,4 +61,4 @@ def infer_waveform(mel, normalize=True,  batched=True, target=8000, overlap=800,
         mel = mel / hp.mel_max_abs_value
     mel = torch.from_numpy(mel[None, ...])
     wav = _model.generate(mel, batched, target, overlap, hp.mu_law, progress_callback)
-    return wav
+    return wav, hp.sample_rate

web/__init__.py

@@ -107,14 +107,15 @@ def webApp():
         embeds = [embed] * len(texts)
         specs = current_synt.synthesize_spectrograms(texts, embeds)
         spec = np.concatenate(specs, axis=1)
+        sample_rate = Synthesizer.sample_rate
         if "vocoder" in request.form and request.form["vocoder"] == "WaveRNN":
             wav = rnn_vocoder.infer_waveform(spec)
         else:
-            wav = gan_vocoder.infer_waveform(spec)
+            wav, sample_rate = gan_vocoder.infer_waveform(spec)
 
         # Return cooked wav
         out = io.BytesIO()
-        write(out, Synthesizer.sample_rate, wav.astype(np.float32))
+        write(out, sample_rate, wav.astype(np.float32))
         return Response(out, mimetype="audio/wav")
 
     @app.route('/', methods=['GET'])