[BE] unsupported backward failing on single sample (#59455)
Summary:
Echo on https://github.com/pytorch/pytorch/pull/58260#discussion_r637467625
similar to `test_unsupported_dtype` which only check exception raised on the first sample. we should do similar things for unsupported_backward as well. The goal for both test is to remind developer to
1. add a new dtype to the support list if they are fulling runnable without failure (over all samples)
2. replace the skip mechanism which will indefinitely ignore tests without warning
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59455
Test Plan: CI.
Reviewed By: mruberry
Differential Revision: D28927169
Pulled By: walterddr
fbshipit-source-id: 2993649fc17a925fa331e27c8ccdd9b24dd22c20
Author
Rong Rong (AI Infra)