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Co-authored-by: krishnakalyan3 <skalyan@cloudera.com>

Co-authored-by: krishnakalyan3 <skalyan@cloudera.com>

* improve commonvoice test

* update yesno test

* refactor commonvoice dataset unittest

Resolves #1125 where dataset metadata does not contain an extension.

* Import torchaudio #1105 37692d8d

Summary: Import torchaudio up to #1105 37692d8d

Reviewed By: datumbox

Differential Revision: D25671497

fbshipit-source-id: 5af11c801321f2bb964245ac6ed74979310f4b5f

The use of `walk_files` made it ambiguous who is responsible to locate 
the correct set of files. (Dataset class? or utility?)
In fact, just glob-ing everything is not the right problem being solved in implementing
Dataset, because if you have a specific dataset you consider to access, then
the directory structure and file locations are determined. No need to do arbitral number of recursions.
Each Dataset implementation should be glob-ing the right set of files it requires.

* Removes code for download logics 
* [BC-breaking] Changes the meaning of `root` argument to the exact directory of the dataset
* Deprecates the constructor arguments for download and subdirectory construction

* Resolves https://github.com/pytorch/audio/issues/1095

This reverts commit 09a6fca1.

no longer allow to download the dataset directly. deprecate: download and url. add language.

Currently `libsox` on Linux is compiled with GPU OpenMP and it interferes with the version PyTorch uses (Intel in case of binary distribution). This PR disables OpenMP support for `libsox`, while we investigate the way to use the same OpenMP as PyTorch's version.

Co-authored-by: Vincent QB <vincentqb@users.noreply.github.com>

Co-authored-by: Vincent QB <vincentqb@users.noreply.github.com>

Refer to #903 for the overview of planned I/O changes.

* Change the default backend from `"sox"(deprecated)` to `"sox_io"`
* Change the default interface of `"soundfile"` backend to the one identical to `"sox_io"` backend.
* Deprecate torchaudio.USE_SOUNDFILE_LEGACY_INTERFACE
* Update documentations
    * Re-order backends (default first)
    * Update overhaul timeline (removed 0.7.0)
    * Simplify `"soundfile"` backend description

and add test on other backend.