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Diffstat (limited to 'dnn/torch/lpcnet/utils/misc.py')
-rw-r--r-- | dnn/torch/lpcnet/utils/misc.py | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/dnn/torch/lpcnet/utils/misc.py b/dnn/torch/lpcnet/utils/misc.py new file mode 100644 index 00000000..dab4837f --- /dev/null +++ b/dnn/torch/lpcnet/utils/misc.py @@ -0,0 +1,36 @@ +import torch + + +def find(a, v): + try: + idx = a.index(v) + except: + idx = -1 + return idx + +def interleave_tensors(tensors, dim=-2): + """ interleave list of tensors along sequence dimension """ + + x = torch.cat([x.unsqueeze(dim) for x in tensors], dim=dim) + x = torch.flatten(x, dim - 1, dim) + + return x + +def _interleave(x, pcm_levels=256): + + repeats = pcm_levels // (2*x.size(-1)) + x = x.unsqueeze(-1) + p = torch.flatten(torch.repeat_interleave(torch.cat((x, 1 - x), dim=-1), repeats, dim=-1), -2) + + return p + +def get_pdf_from_tree(x): + pcm_levels = x.size(-1) + + p = _interleave(x[..., 1:2]) + n = 4 + while n <= pcm_levels: + p = p * _interleave(x[..., n//2:n]) + n *= 2 + + return p
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