Update stft tests to support latest librosa (#72833)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/72833
Closes #72550
The latest version of librosa breaks backward compatibility in two
ways:
- Everything except the input tensor is now keyword-only
- `pad_mode` now defaults to `'constant'` for zero-padding
https://librosa.org/doc/latest/generated/librosa.stft.html
This changes the test to match the old behaior even when using the new
library and updates the documentation to explicitly say that
`torch.stft` doesn't exactly follow the librosa API. This was always
true (`torch.stft` it has new arguments, a different default window
and supports complex input), but it can't hurt to be explicit.
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D34386897
Pulled By: mruberry
fbshipit-source-id: 6adc23f48fcb368dacf70602e9197726d6b7e0c1
(cherry picked from commit b5c5ed41963022c9f26467279ed098fb905fa00a)
