iSTFT_module_1_8 is a wrong function

[yezhangyinge]

Hello! Thank you for your great work. But I found that the iSTFT_module_1_8 is a wrong function, which does not work well when the frame shift is 8ms and the frame len is 32ms (which means 3/4 overlap). I carefully checked the value of the result of the process:

1. test_sample= torch.randn((512*100), dtype=torch.float32)*100
2. do stft
3. use iSTFT_module_1_8 to get new_sample
4. print(torch.abs(test_sample-new_sample).mean())
   After I do these, I found that the mean value of abs is very big, which means the calcucation of this function is wrong.
   Did I miss something? Could you give me some advise? My wechat is yezhangyinge, could you add me if you are convenient?
   Thank you very much!