Support at::cpu on non-structured kernels (#51590)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51590
This PR backports a subset of Jiakai's changes from
https://github.com/pytorch/pytorch/pull/51554 that adds support
for at::cpu in non-structured kernels.
The unusual bits:
- Need to add a new forward inference rule for doing conversions
of const optional<Tensor>& to const Tensor&
- Need to give the wrapper functions a prefix so that the call to
wrapper is not ambiguous
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: ljk53
Differential Revision: D26209871
Pulled By: ezyang
fbshipit-source-id: 8162686039675ab92a2af7a14f6b18941f8944df
