Starting an unconditional generation experiment

[ladium493]

For unconditional generation, is that changing
y = self.dilated_conv(y) + conditioner in model.py
to
y = self.dilated_conv(y)
avaliable?

And how to generate samples?

[sharvil]

I haven't experimented too much with unconditional generation yet. You'll have to make the code changes yourself if you want to play with it before I get around to making the changes.

Besides removing the conditioning network, you'll also need to increase the receptive field size so that it covers the entire utterance. Specifically:

• increase number of layers to 36
• increase dilation cycle length to 12
• increase diffusion steps to 200
• increase residual channels to 256
• use a linear spaced noise schedule covering [1e-4, 2e-2]

All of the changes I listed can be made in params.py and are tuned to the Speech Commands 0-9 dataset. Generating samples is pretty straightforward: in inference.py you'll just drop the spectrogram argument and pass in None to the model.

Let me know if you have more questions. I'd love to hear how your experiment goes!

[ladium493]

Finally got some results instead of small noise. A smaller dataset is used for training (up down left right). T=20 result in some recognizable voices. Thanks for helping!

And what about adding padding to the short samples instead of deleting them? If all samples in a minibatch are deleted, the training process will be terminated, which is annoying.
https://github.com/lmnt-com/diffwave/blob/master/src/diffwave/dataset.py#L56

[sharvil]

Great! Glad to hear you're getting something that resembles speech.

Padding is a valid way to handle short samples, though it has the effect of being less computationally efficient. Another option - especially if you have a lot of short samples which it sounds like you do - is to reduce the number of frames to train on (also in params.py).

[ladium493]

Yes that works. My problems are solved. Thanks for your helping!

[ladium493]

Yes that works. My problems are solved. Thanks for your helping!

[moiseshorta]

Hi,

I'm very curious onto how to implement the unconditional generation for my experiments as well.

Would have any code modifications on how to do this?

Thanks so much

[sharvil]

@moiseshorta, have you tried making the changes I described in #5 (comment)? That should be a good starting point for your experiments.