Fix For Requires Grad Infinite Loop (#18361)
Summary:
Previously, we would continue to run requires grad on a loop body when the outputs and inputs disagreed. This adds a check so that we don't continue running if the results haven't changed since the last run.
Fix for https://github.com/pytorch/pytorch/issues/18320
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18361
Differential Revision: D14584332
Pulled By: eellison
fbshipit-source-id: 696b225f80a2036318540946428b525985a9e735
