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Now that most of our test cases are backend aware/agnostic,
the use of BACKENDS and BACKENDS_MP3 is anti-pattern.

This change moves these definitions to the legacy test module `test_io`.

If a new backend is added in future, that backend should have separate test suite,
(like the ones in `test/sox_io_backend`) so instead of dynamically listing available
backend in `test_io`, the changed code only checks "sox" backend and "soundfile" backend.

* Remove underscore of model name
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* Add test for CommonVoice dataset

* Migrate the existing tests for `bg_iterator` and `diskcache_iterator` to `test/datasets/utils_test.py`
Co-authored-by: Leon Gao <legao@linkedin.com>

Co-authored-by: lawrencechen <lawrencechen@devvm3189.vll0.facebook.com>

Co-authored-by: Edward Lu <edlu@fb.com>

* Update sample rate of libritts test
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

Buck fails to run tests if they contain "-" symbol.

Part of #764

* Separate sox list format function for read and write

* Guard MP3 smoke test

buck gets confused with utility module name with `test_` prefix.

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

Currently all the tests in `sox_io_backend` and `sox_effects` (for new SoX effects implementation) requires additional `sox`, and this prevents running test in environment where `sox` command is not available even though `torchaudio` extension is available (such as fb internal). This PR adds smoke tests for these modules, which just runs functions to see if they do not crash.

Co-authored-by: Jeff Zhang <jeffzhang@fb.com>

* Add libritts

Add LibriTTS dataset draft

* Add libritts

Use two separate ids for utterance_id.

* Update output form

Use full_id as utterance_id.

* Update format

Add space and test black format

* Update test method

* Add audio and text test

Generate audio and test files on-the-fly in test 

* Update format

* Fix test error and remove assets libritts

The test error is fixed by sorting the file in 4th element instead of 2nd element in samples. Since the files are generated on-the-fly, so the the libritts files in assets are removed.

* Add seed in `get_whitenoise` function

* Change utterance to text

Change `_utterance` to `_text`.
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* Change the name of  n_output and n_hidden

* Replace the mode by n_classes and sample_rate

* Change the definition of n_output and n_hidden
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* Addressed review issues in PR #668

* Changed GTZAN so that it only traverses filenames belonging to the dataset

Now, instead of walking the whole directory and subdirectories of the dataset
GTZAN only looks for files under a `genre`/`genre`.`5 digit number`.wav format, where `genre` is an allowed GTZAN genre label.
This allows moving or removing files from the dataset (e.g. for fixing duplication or mislabeling issues).

* Get rid of sine wave files and whitenoise files
* Refactor integer encoding
* Relax rtol from 1e-8 to 1e-7 for compliance kaldi
* relax waveform multi channel resample atol to 1e-7 from 1e-8
* relax tolerance for length consistency for speed effect
Co-authored-by: moto <855818+mthrok@users.noreply.github.com>

* Add sox_utils module

* Make init/shutdown thread safe

* Add sox effects implementation

* Add test for sox effects

* Update docstrings and add examples

This PR replaces `torchaudio.sox_effects.SoxEffectsChain` in `test_sox_compatibility` with bare `sox` command.

The parity of `torchaudio.sox_effects.SoxEffectsChain` against `sox` command is not tested and it has known issues https://github.com/pytorch/audio/issues/771, therefore it is not appropriate to use this class for testing other functions.

`test/test_sox_effects.py::Test_SoxEffectsChain::test_lowpass_speed` has some issue on our macOS CI, even though there was no issue at #777 .

While we figure out the fix, we disable this test for macOS.

Part of #764

 - Replace `whitenoise.wav` with on-the-fly data generation
 - Replace `torchaudio.load` with `common_utils.load_wav`
 - Replace `steam-train-whistle-daniel_simon.mp3` with `.wav`

* Change 'sox' to 'default'

* 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>

* upsamplenetwork

* update variable names

* update variable name

* add wavernn model

* update test

* update format

* update format

* update format

* fix conflicts and add transpose

* import update

* update transpose

* update format

* update docstring

* add n_channel in input

* add comment

* update docstring

* update docstring
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* upsamplenetwork

* update name

* update name and docstring

* update format

* rebase

* update docstring

* update docstring

* remove transpose and update docstring
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

This is a part of PRs to add new "sox_io" backend. #726 and depends on #718, #728 and #731.

This PR adds `save` function to "sox_io" backend, which can save Tensor to a file with the following audio formats;
 - `wav`
 - `mp3`
 - `flac`
 - `ogg/vorbis`

* update varible names and docstring

* update format

* update docsting and output value
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>