add a note on numerical accuracy (#65947)
Summary:
Per title
Fixes https://github.com/pytorch/pytorch/issues/54437
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65947
Reviewed By: albanD
Differential Revision: D31612445
Pulled By: ngimel
fbshipit-source-id: 5c155891a088aef3b9813f253d0dc1ee4d51ae1c
