batch_norm_jvp: improve error message when running_{mean,var} have forward grad defined (#73655)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73655
Fixes: https://github.com/pytorch/pytorch/issues/73541
Test Plan: Imported from OSS
Reviewed By: zou3519
Differential Revision: D34586758
Pulled By: soulitzer
fbshipit-source-id: 689dba3ac159e50b596381c27e23ef1fd8122a40
(cherry picked from commit 81ea860fbe3c217b0100730f4b74e8d5f9bf1b61)
