pytorch

8cf01c5c - Back out "change pt_defs.bzl to python file"

Back out "change pt_defs.bzl to python file" Summary: Original commit changeset: d720fe2e684d Test Plan: CIs Reviewed By: linbinyu Differential Revision: D23114839 fbshipit-source-id: fda570b5e989a51936a6c5bc68f0e60c6f6b4b82