method error to Step 1 : Time warping

[eeric]

your code was error on 75th line in spec_augment_pytorch.py.
log mel spectrogram wasn't changed by Step 1 : Time warping.
the module was modified as follows:
for i in range(v):
for j in range(tau):
offset_x = 0
offset_y = 20
if j + offset_y < tau:
warped_mel_spectrogram[i, j] = mel_spectrogram[i,(j + offset_y) % tau]
else:
warped_mel_spectrogram[i, j] = mel_spectrogram[i, j]

the means was as if translation to mel spectrogram, it wasn't fit to paper SpecAugment named.