BatchedFallback: stop emitting the entire schema in the fallback warning (#44051)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44051
Instead, just emit the operator name. The entire schema is pretty wordy
and doesn't add any additional information.
Test Plan: - modified test: `pytest test/test_vmap.py -v`
Reviewed By: ezyang
Differential Revision: D23481184
Pulled By: zou3519
fbshipit-source-id: 9fbda61fc63565507b04c8b87e0e326a2036effa
