Allow registering ops without specifying the full schema (#19286)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19286
The operator registration API now allows registering an operator by only giving the operator name and not the full operator schema,
as long as the operator schema can be inferred from the kernel function.
Reviewed By: dzhulgakov
Differential Revision: D14931921
fbshipit-source-id: 3776ce43d4ce67bb5a3ea3d07c37de96eebe08ba
