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Changing the test Docker image for GPU tests to use Nvidia Docker `devel` image. This is necessary for #1187. 

TorchScript BC test checks that if dumped object from the previous version is compatible with the latest master. However, PyTorch does not guarantee backward compatibility of serialized TorchScript object across versions. Domain libraries do not guarantee this either.

torchaudio can work with any version of pytorch so let's strip the
pytorch version suffix to denote that
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>

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

* Support file-like object in save func

* Disable CircleCI cache for TP artifacts for cleaner build

With this change, `BUILD_TRANSDUCER=1 python setup.py build_ext` now sees `-D_GLIBCXX_USE_CXX11_ABI=` in the compilation command. (Note: sox is C-only so it is not relevant to sox build process)

See also:
 - https://github.com/pytorch/text/pull/931
 - https://stackoverflow.com/a/55406930

This reverts commit 84966ae1.

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

Also replaces `assert_allclose` with `assertEqual`.
Co-authored-by: krishnakalyan3 <skalyan@cloudera.com>

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.