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