Fix VITS upsampling asserts

[Edresson]

Fix upsampling VITS asserts that was broken.

[erogol]

I don't even see an assert fix in this PR? Do I miss something ?

[Edresson]

I don't even see an assert fix in this PR? Do I miss something ?

It fixes the upsampling asserts during the training. Without this, we can't train the model, because depending on the length of the audio the spectrogram length multiplied by the upsampling factor is not equal to the mel-spectrogram length. So I removed some frames of the audio like @WeberJulian did for the bandwidth extension model

We have two alternatives to the training works:

1. Apply the changes in this PR (the better in my opinion)
2. We can remove the upsampling asserts

[erogol]

I don't see an assert removed in the changes.

[Edresson]

I don't see an assert removed in the changes.

Because I have chosen to apply the changes in this PR. This PR fixes the asserts errors during the training keeping the asserts.

[erogol]

I don't see an assert removed in the changes.

Because I have chosen to apply the changes in this PR. This PR fixes the asserts errors during the training keeping the asserts.

I don't understand, sorry. Where are the asserts? What assert did you change? Do you mean assert python statement?

[Edresson]

I don't see an assert removed in the changes.

Because I have chosen to apply the changes in this PR. This PR fixes the asserts errors during the training keeping the asserts.

I don't understand, sorry. Where are the asserts? What assert did you change? Do you mean assert python statement?

These asserts 1 and 2 in some cases (depending on the audio length) break the upsampling training. So to fix this bug I submitted this PR.

[erogol]

I don't see an assert removed in the changes.

Because I have chosen to apply the changes in this PR. This PR fixes the asserts errors during the training keeping the asserts.

I don't understand, sorry. Where are the asserts? What assert did you change? Do you mean assert python statement?

These asserts 1 and 2 in some cases (depending on the audio length) break the upsampling training. So to fix this bug I submitted this PR.

Can you link to your exact changes in the code which fix those asserts? I don't understand how you fix those lines without touching those lines

[Edresson]

I don't see an assert removed in the changes.

Because I have chosen to apply the changes in this PR. This PR fixes the asserts errors during the training keeping the asserts.

I don't understand, sorry. Where are the asserts? What assert did you change? Do you mean assert python statement?

These asserts 1 and 2 in some cases (depending on the audio length) break the upsampling training. So to fix this bug I submitted this PR.

Can you link to your exact changes in the code which fix those asserts? I don't understand how you fix those lines without touching those lines

My bad I accidentally included the reinit encoder/duration predictor. Now I kept on this PR just the code that solves the asserts and added the reinit encoder/duration predictor in the PR #1562.

I don't understand how you fix those lines without touching those lines

These asserts are about the audio/spectrogram length, so if we guarantee that the audio/spectrogram is divisible by the upsampling factor, the problem is solved.