pytorch

91744907 - SGD: updated step and class design (#32592)

SGD: updated step and class design (#32592) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/32592 Differential Revision: D19868154 Pulled By: anjali411 fbshipit-source-id: ce888efc68b1531d97e8b0abf2b146198e012d2f