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Have the same problem. I've been using sparse vectors as well.

@Liujingxiu23 did you manage to train the model from scratch? what is the value for dur loss in your logs? i get it as a negative value pretty soon. synthesis...

@Liujingxiu23 did you train ljs or vctk setup? i'm trying vctk one at the moment. I've turned fp16_run off (did you use it in your case), what batch size did...

 Yeah, something like from 4k steps it gets negative.

Okay, segment_size and batch_size? What GPU VRAM size you use? I have 8GiB and by default this model is too big. Also, get some run time errors from pytorch with...

Tried another config, 4k steps, dur is not negative. will train for 50K to see further.  This is a spectrogram of both models says "good evening", scratch.ogg from current...

 It's a current tensorboard.

@Liujingxiu23 well, just checked a current result.  still dur loss gets negative at some points. tried to listen to the audio. complete gibberish.  I don't have 2x32GiB GPU,...

Started 8KHz, ljs_nosdp, batch_size==1, fp16 == false   Will check the result in 8hours from now.

   Looks a bit better, yet generated sound is non sense. Maybe need to fine tune fft parameters as well, cause it can be too rough for 8192...