Adds opinfo-based autograd tests and (un)supported dtype tests (#43451)
Summary:
This PR adds a new test suite, test_ops.py, designed for generic tests across all operators with OpInfos. It currently has two kinds of tests:
- it validates that the OpInfo has the correct supported dtypes by verifying that unsupported dtypes throw an error and supported dtypes do not
- it runs grad and gradgrad checks on each op and its variants (method and inplace) that has an OpInfo
This is a significant expansion and simplification of the current autogenerated autograd tests, which spend considerable processing their inputs. As an alternative, this PR extends OpInfos with "SampleInputs" that are much easier to use. These sample inputs are analogous to the existing tuples in`method_tests()`.
Future PRs will extend OpInfo-based testing to other uses of `method_tests()`, like test_jit.py, to ensure that new operator tests can be implemented entirely using an OpInfo.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43451
Reviewed By: albanD
Differential Revision: D23481723
Pulled By: mruberry
fbshipit-source-id: 0c2cdeacc1fdaaf8c69bcd060d623fa3db3d6459
