enable torch.optim.swa_utils.SWALR (#42574)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/42435
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42574
Reviewed By: zou3519
Differential Revision: D22949369
Pulled By: vincentqb
fbshipit-source-id: f2f319ec94a97e0afe4d4327c866504ae632a986
