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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`)

This reverts commit cfe3f296.

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

This reverts commit 7236e3f4

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* 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.

vctk dataset

add label processing

added tests

chunk dataset

simple caching scheme

caching fixed

vctk downsample

yesno dataset