pytorch

895e79ad - Revert D16441000: Switch from KaTeX to imgmath for documentation rendering.

Revert D16441000: Switch from KaTeX to imgmath for documentation rendering. Differential Revision: D16441000 Original commit changeset: c1ab557cb816 fbshipit-source-id: cbfec2ca648b614b291debd6b3e215db9fbeb57b