Revert D26403094: ns for fx - stubs of the three APIs (compare weights, activations, activations with shadow)
Test Plan: revert-hammer
Differential Revision:
D26403094 (https://github.com/pytorch/pytorch/commit/37622db76a102cee7df67bab8d228780fef0874d)
Original commit changeset: 9752331d4ae0
fbshipit-source-id: f0a32d443a29b25af33d90420dfd1bada40c917c
