models/src/wavenet_vocoder/wavenet.py (2 lines):
	- line 270: network output to input for the next time step. TODO: rename
	- line 322: initial_input[:, :, 127] = 1  # TODO: is this ok?


models/src/wavenet_vocoder/mixture.py (1 line):
	- line 89: # TODO: cdf_delta <= 1e-5 actually can happen. How can we choose the value