Revert D33246843: [pytorch][PR] Implementation of Wishart distribution
Test Plan: revert-hammer
Differential Revision:
D33246843 (https://github.com/pytorch/pytorch/commit/a217a62e73fd30b658743af8a69966f90327f018)
Original commit changeset: 825fcddf4785
Original Phabricator Diff: D33246843 (https://github.com/pytorch/pytorch/commit/a217a62e73fd30b658743af8a69966f90327f018)
fbshipit-source-id: 2c8063e8d10e9d3ac20fa44673e6011ed1160753
