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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.

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

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

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

* Make test module name descriptive

* Rename test_functional_filtering to test_sox_compatibility

* testing with sox only when sox is available.

* use wav instead of mp3 for testing functions.

* typo.

* guard against not sox.

* backends definition.

* grouping backend functions into a separate file.

* remove duplicated code.

* requires sox.

* replace by wav, requires sox.

* require with scope.

* undo alignment.

* requires sox for these two, because of mp3.

* no longer need first mp3.

* cleaning.

* new wav version of file.

* flake8.

* remove unnecessary load.

* flake8.

* lint.

* lint.

* revert formatting of file.

* merging into common_utils.

* docstring.

* rename to common_utils.

This reverts commit cdf5c83d.

closes #387

* move sox inside function calls.

* add backend switch mechanism.

* import sox at runtime, not import.

* add backend list.

* backend tests.

* creating hidden modules for backend.

* naming backend same as file: soundfile.

* remove docstring in backend file.

* test soundfile info.

* soundfile doesn't support int64.

* adding test for wav file.

* error with incorrect parameter instead of silent ignore.

* adding test across backend. using float32 as done in sox.

* backend guard decorator.

- Apply __future__ imports uniformly (future division is the biggy, but absolute
  imports mattered too)
- Hotfix use of tempfile.TemporaryDirectory using a BC library (DO NOT
  add this library as a dependency to torchaudio; it's only for testing)
- Replace math.gcd with fractions.gcd
- Fix a weird pytest collection bug involving parametrized tests
- Turn on Python 2 and Python 3.7 in Travis.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>

This makes it easier to test against an installed wheel, as the
torchaudio folder is no longer preferentially picked up when
you run a test module.

I had to move all tests in subfolders into the top level test
directory to make this work, since you can't access .. modules
without mucking around with sys.path (which I don't want to do.)

NB: this BREAKS the syntax where you can run a test by
saying `python -m test.test`.  Instead, do `python test/test.py`
or use the pytest runner.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>

This reverts commit cfe3f296.

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

This reverts commit 7236e3f4

.

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

* Revert "Nits"

This reverts commit 2db284c4.

* Revert "Conform to sox library a bit better"

This reverts commit c340a8d1.

* Revert "Added test to make sure loading and saving gives the same file"

This reverts commit cba11009.

* Revert "Rewrote C code with C++ extensions"

This reverts commit 8a41ecdc.

.gitignore _ext/

vctk dataset

add label processing

added tests

chunk dataset

simple caching scheme

caching fixed

vctk downsample

yesno dataset