Support pytest for distribution testing (#45648)
Summary:
In response to https://github.com/pytorch/pytorch/issues/11578. This is a test run to see if CI (and other internal systems) works fine with pytest style tests.
- Creates a separate `distributions` directory within `test`.
- For testing, this rewrites the `constraint` tests as parameterized tests in pytest. I don't plan to convert any other tests to pytest style, but only expose this option for adding new tests, if required.
If this is a success, we can move `EXAMPLES` in `test_distributions` into a separate file that can be imported by both pytest and unittest style tests. cc. fritzo
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45648
Reviewed By: ezyang, colesbury
Differential Revision: D24080248
Pulled By: neerajprad
fbshipit-source-id: 1f2e7d169c3c291a3051d0cece17851560fe9ea9
