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Migrate audio transform computations into functional.py

Fix error "cannot open file", when the audiodir_path is different from where the code is run.

* saving commit

* more fixes

* Update test.py

* flake8 style, tests moved

* typo

* DCT now a method of MFCC class. Changed DCT impelementation to @dhpollack suggestion"

* changes to address pr comments

* ordering

* fix dct docstring

* fix dct docstring

* DCT matrix needs to go on same device

* DCT matrix needs to go on same device

* log mfcc option

Rename classes in line with PyTorch standards. Remove redundent slow librosa-based `MEL`. Add missing docstring params. (#78)

* Bug fix: Use correct device for MEL2 functions so MEL2 works on CUDA tensors

* Rename classes in line with PyTorch standards. Remove redundent
slow librosa-based `MEL`. Add missing docstring params.

* fix param names

* Bug fix: ff top_db is None then can not check `top_db>0`

* fix formatting

This reverts commit cfe3f296.

* Revert "Revert "Rewrote C code with C++ extensions" (#39)"

This reverts commit 7236e3f4

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* Fix import error of C extension
Signed-off-by: Edward Z. Yang <ezyang@fb.com>

Download of dataset requires to hold archive in memory