pytorch

049284e1 - Make observer scriptable

Make observer scriptable Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/24996 Test Plan: Imported from OSS Differential Revision: D16952938 Pulled By: jamesr66a fbshipit-source-id: 3d08e0c746603d0fe090fb3dbf13c5fc9dc022f4