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* Import torchaudio #1105 37692d8d

Summary: Import torchaudio up to #1105 37692d8d

Reviewed By: datumbox

Differential Revision: D25671497

fbshipit-source-id: 5af11c801321f2bb964245ac6ed74979310f4b5f

This CC adds CI test to check the backward compatibility of Torchscript functions/object dumps.

The job first dumps Torchscript objects into file from torchaudio 0.6.0 release environment (x Python 3.6, 3.7, 3,8), then load & run the function in master build (in Python 3.6, 3.7, 3.8).

If there is a BC-breaking change in master build, (registration schema change), then the test should fail.

At this moment, `info` function does not work due to suspected bug in torch side, so the test is disabled for `info` function. See https://github.com/pytorch/pytorch/issues/42258 for the detail. Once https://github.com/pytorch/pytorch/issues/42258 is resolved we can enable it.

We have been running unit test with editable installation. (i.e. `python setup.py develop`), with which we missed issues like #842. 

This CC makes installation in CI non-editable, and change test directory structure so that the source code will not shadow the installed version of `torchaudio`. With simple `pytest test`, `pytest` modifies `sys.path` and prepend checked out repository, which shadows the installed version.

To remedy this, the whole test suites has been moved from `./test` to `./test/torchaudio_unittest`. This adds nice module structure to our test code and we can do absolute import in each test module, which makes it possible again to run test with `python -m unittest torchaudio_unittest/XXX.py`

This change does not affect the regular development process (`python setup.py develop` && `pytest test`)

* Update links
* Add how to run tests
* Update asset info

1. Move misplaced sox compatibility test (T,Fade, T.Vol, T.Vad) to test/test_sox_compatibility.py
2. Move test_sox_effects to test/sox_effect/ where all the other functionalities from torchaudio.sox_effects are tested

* converted CommonVoice tartar mp3 to wav using rate 8000 Hz

* Remove Unused dtmf_30s_stereo.mp3

* add Waveforms for Testing Purposes section

* Update test/README.md

use wrapper function for scipy.io.wavfile.read
Co-authored-by: moto <855818+mthrok@users.noreply.github.com>

* remove un-used files from the doc

* Update test/README.md

Rename variable
Co-authored-by: moto <855818+mthrok@users.noreply.github.com>

* fix indent; remove mentions of unused files

* remove whitenoise* files from README.md
Co-authored-by: moto <855818+mthrok@users.noreply.github.com>

* Make tests backend aware by introducing TorchaudioTestCase and reset backend for each TestCase.

* Set backends for the test cases that require specific backend.

* Add README for test

* Apply review feedback

* Add description to test_dataloader