in Torchaudio=0.7.0, where is torchaudio.functional.istft?
I used torchaudio.functional.isftf when the version torchaudio=0.4.0
But now, the version of torchaudio has been upgraded to 0.7.0, so I installed it, but torchaudio.functional.istft is gone.
I need to learn a deep learning model using torchaudio.functional.istft.  How do I do it??

It's deprecated now in favor of torch.istft.
Check release notes and PR#523.
