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Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

[`sox_format_t.tell_off`](https://fossies.org/dox/sox-14.4.2/structsox__format__t.html#a2016a9fa839f3139e3c2f64381b0c445) should be representing current offset in file, but there are cases it does not. This was causing segmentation fault in some cases. This PR fixes it by replacing it with `ftell` call and add extra check so that if the same thing should happen, it will throw runtime error instead of segmentation fault.

fix 'file-does-not-end-in-newline' and typo.

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

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

* Support file-like object in save func

* Disable CircleCI cache for TP artifacts for cleaner build

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

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.

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

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

* 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

- yesno
- librispeech
- libritts
- speechcommands
Co-authored-by: krishnakalyan3 <skalyan@cloudera.com>
Co-authored-by: Vincent Quenneville-Belair <vincentqb@gmail.com>

This reverts commit 09a6fca1.

* Import torchaudio #1034 70f429a4

Summary: Import torchaudio #1027 0cf4b8a9

Reviewed By: vincentqb, cpuhrsch

Differential Revision: D24958707

fbshipit-source-id: d06dd6b59197cc2c16bec5a9012cbf33a172b6b3

* Import torchaudio #1066 4406a6bb

Summary: Import up to #1066

Reviewed By: cpuhrsch

Differential Revision: D25373068

fbshipit-source-id: 890d36a25259b93428b3037c3123ff5a2cacfa04