pytorch

97585ae1 - Simplify forward / backward AD for linalg.eigh and add checks (#70528)

Simplify forward / backward AD for linalg.eigh and add checks (#70528) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/70528 This PR adds checks for the backward of `linalg.eigh`, similar to those deduced in https://github.com/pytorch/pytorch/pull/70253 It also makes its the implementation parallel that of the (fwd/bwd) derivative of `torch.linalg.eig` and it makes most OpInfo tests pass. cc jianyuh nikitaved pearu mruberry walterddr IvanYashchuk xwang233 Lezcano Test Plan: Imported from OSS Reviewed By: mruberry Differential Revision: D33530149 Pulled By: albanD fbshipit-source-id: 1f368b8d450d4e9e8ae74d3881c78513c27eb956