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added LPCNet torch implementation

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Signed-off-by: Jan Buethe <jbuethe@amazon.de>
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Jan Buethe 2023-09-05 12:29:38 +02:00
parent 90a171c1c2
commit 35ee397e06
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38 changed files with 3200 additions and 0 deletions
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dnn/torch/lpcnet/utils/sample.py Normal file
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import torch
def sample_excitation(probs, pitch_corr):
norm = lambda x : x / (x.sum() + 1e-18)
# lowering the temperature
probs = norm(probs ** (1 + max(0, 1.5 * pitch_corr - 0.5)))
# cut-off tails
probs = norm(torch.maximum(probs - 0.002 , torch.FloatTensor([0])))
# sample
exc = torch.multinomial(probs.squeeze(), 1)
return exc