It was mentioned in #1059 that it might be good to support a narrow range of frequencies to find the spectral centroid. This is an attempt at that.

Apologies if this is not correct, it is my first attempt at a PR for pytorch/audio!

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CircleCI is not getting triggered. Let me close and reopen the PR to see if it helps.

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Hi @mthrok, sorry for taking a little while to get back to you.

I added a test in batch_consistency_test.py for the new behaviour -- I am not sure if this is the right place.

The basic idea of why you would want this is that you might want the centroid of a specific range of frequencies. I used this recently because I only wanted the centroid of voiced frequencies.

A downside of accepting this is that it adds features that aren't present in librosa. I think this transform was initially intended to clone a function from that library