Revert D20193196: [pytorch][PR] PCA and SVD for low-rank matrices, LOBPCG for positive-defined generalized eigenvalue problem
Test Plan: revert-hammer
Differential Revision:
D20193196
Original commit changeset: 78a487991242
fbshipit-source-id: 8da4f8cb17c45af41e8c0ce80bc72581eb10dbb8
