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fix mel_spectrogram cache keys to include all config parameters #120

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fix mel_spectrogram cache keys to include all config parameters #120

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14 changes: 8 additions & 6 deletions west/utils/audio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -60,15 +60,17 @@ def mel_spectrogram(y,
# print("max value is ", torch.max(y))

global mel_basis, hann_window # noqa
if f"{str(fmax)}_{str(y.device)}" not in mel_basis:
mel_key = f"{n_fft}_{num_mels}_{sampling_rate}_{fmin}_{fmax}_{str(y.device)}"
win_key = f"{win_size}_{str(y.device)}"
if mel_key not in mel_basis:
mel = librosa_mel_fn(sr=sampling_rate,
n_fft=n_fft,
n_mels=num_mels,
fmin=fmin,
fmax=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)
mel_basis[mel_key] = torch.from_numpy(mel).float().to(y.device)
if win_key not in hann_window:
hann_window[win_key] = 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)),
Expand All @@ -81,7 +83,7 @@ def mel_spectrogram(y,
n_fft,
hop_length=hop_size,
win_length=win_size,
window=hann_window[str(y.device)],
window=hann_window[win_key],
center=center,
pad_mode="reflect",
normalized=False,
Expand All @@ -91,7 +93,7 @@ def mel_spectrogram(y,

spec = torch.sqrt(spec.pow(2).sum(-1) + (1e-9))

spec = torch.matmul(mel_basis[str(fmax) + "_" + str(y.device)], spec)
spec = torch.matmul(mel_basis[mel_key], spec)
spec = spectral_normalize_torch(spec)

return spec