pytorch

4937d9fd - Fix Dispatching not considering List[Optional[Tensor]] for dispatch (#60787)

Fix Dispatching not considering List[Optional[Tensor]] for dispatch (#60787) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/60787 Fixes #60461. Previously, when one calls `self.index(indices)` using a regular `self` Tensor and a `BatchedTensor` indices the dispatcher would not dispatch to the Batched key. This is because the dispatcher did not extract dispatch keys from `indices`. Similar #58283 and #58296, this PR modifies the dispatcher to extract dispatch keys from List[Optional[Tensor]] arguments. We do this for both boxed and unboxed kernels. Test Plan: - run the test case in https://gist.github.com/zou3519/4421df7c5271376a0ef53ca857b18740 (requires functorch). After this PR, it raises `RuntimeError: Batching rule not implemented for aten::index.Tensor. We could not generate a fallback.`, which shows that dispatch happened on the Batched key. - Taking suggestions for how to write a test for this in core Reviewed By: jbschlosser Differential Revision: D29438611 Pulled By: zou3519 fbshipit-source-id: 77e182f763e18aa3fa857eebafa8b7f83384db71