pytorch

77ee1f5f - Revert D16923660: Support observer without any data calibration

Revert D16923660: Support observer without any data calibration Test Plan: revert-hammer Differential Revision: D16923660 Original commit changeset: 9927ed4e4ee9 fbshipit-source-id: 31a2b28584aae3808df6508b4caedb54de32156d