in augment/effects.py [0:0]
def __call__(self, x, src_info, dst_info):
if self.max_frames is None:
max_frames = int(src_info['rate'] * self.max_seconds)
else:
max_frames = self.max_frames
length = np.random.randint(0, max_frames)
start = np.random.randint(0, x.size(1) - length)
end = start + length
x[:, start:end, ...].zero_()
return x, src_info, dst_info