pytorch

640109ae - Back out "Revert D18542342: Boxed variable dispatch"

Back out "Revert D18542342: Boxed variable dispatch" Summary: Original commit changeset: 082992125447 Test Plan: waitforsandcastle Reviewed By: akinh Differential Revision: D18737627 fbshipit-source-id: 7f3e32a6ee0c330002ae7fdcc8a35e8b540bb4db