Throw error if `torch.set_deterministic(True)` is called with nondeterministic CuBLAS config (#41377)
Summary:
For CUDA >= 10.2, the `CUBLAS_WORKSPACE_CONFIG` environment variable must be set to either `:4096:8` or `:16:8` to ensure deterministic CUDA stream usage. This PR adds some logic inside `torch.set_deterministic()` to raise an error if this environment variable is not set properly and CUDA >= 10.2.
Issue https://github.com/pytorch/pytorch/issues/15359
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41377
Reviewed By: malfet
Differential Revision: D22758459
Pulled By: ezyang
fbshipit-source-id: 4b96f1e9abf85d94ba79140fd927bbd0c05c4522
