pinv: forward/backward AD which is Frechet-defined in a rank-preserving neighborhood. (#66092)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/65911. Also enables complex support/tests for `linalg_pinv` in OpInfo.
cc ezyang albanD zou3519 gqchen pearu nikitaved soulitzer Lezcano Varal7 jianyuh mruberry walterddr IvanYashchuk xwang233
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66092
Reviewed By: ejguan
Differential Revision: D31503072
Pulled By: albanD
fbshipit-source-id: 52018e826826ae62beaad76becb5edf880be253f
