Revert "Fixed einsum compatibility/performance issues (#46398)" (#47821)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47821
This reverts commit a5c65b86ce249f5f2d365169e6315593fbd47b61.
Conflicts:
test/test_linalg.py
Test Plan: Imported from OSS
Reviewed By: mruberry
Differential Revision: D24909923
Pulled By: gchanan
fbshipit-source-id: 9dcf98e7c4a3c7e5aaffe475867fa086f3bb6ff2
