pytorch

c30659ff - [ZeRO] (Reland) Add ctor support for multiple param groups (#72932)

[ZeRO] (Reland) Add ctor support for multiple param groups (#72932) Summary: Reland of https://github.com/pytorch/pytorch/pull/72578. **Overview** Windows CI was failing due to the multi-rank single-GPU case (see [here](https://github.com/pytorch/pytorch/runs/5204906995?check_suite_focus=true)). To address this, I - added `common_distributed.skip_if_no_gpu` for `test_multiple_param_groups()` to ensure that each rank can safely call `to(self.device)` -- this targets the expected SPSD use case where each rank has its own GPU; - moved `test_constructor()` back to `TestZeroRedundancyOptimizerSingleRank` to check that the multiple parameter group method for construction works even on a single rank. **Test Plan** - I checked both tests for CPU, 1 GPU, 2 GPUs, 4 GPUs, and 8 GPUs. - I added the `ciflow/win` label to run the failing Windows CI test. Pull Request resolved: https://github.com/pytorch/pytorch/pull/72932 Reviewed By: rohan-varma Differential Revision: D34281482 Pulled By: awgu fbshipit-source-id: c4fe604ddd9d2c123c3071249741e6b8a6454b6e (cherry picked from commit 6bea9bcc6349ff1aad403563206fb170a3af0c70)