pytorch

84cb810b - Revert D34106940: [ZeRO] Add ctor support for multiple param groups

Revert D34106940: [ZeRO] Add ctor support for multiple param groups Test Plan: revert-hammer Differential Revision: D34106940 (https://github.com/pytorch/pytorch/commit/5dd07324578f5110a2ec5c213fb559bc49004c7a) Original commit changeset: 7e70fc0b3cec Original Phabricator Diff: D34106940 (https://github.com/pytorch/pytorch/commit/5dd07324578f5110a2ec5c213fb559bc49004c7a) fbshipit-source-id: 08f846c9c02be8756475f4e0b57eb381f10c27bd (cherry picked from commit 7675497d8358cb289549539dae98579353d85834)