pytorch

e505360e - Revert "[mta] APEX style Fused Adam (#81705)"

Revert "[mta] APEX style Fused Adam (#81705)" This reverts commit 7a6c4d0c50dd0670d87bc39d53292cf8cb90ca04. Reverted https://github.com/pytorch/pytorch/pull/81705 on behalf of https://github.com/dagitses due to broke internal builds, details to come