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