pytorch

bfc7e281 - reland - ns for fx - stubs of the three APIs (compare weights, activations, activations with shadow) (#52302)

reland - ns for fx - stubs of the three APIs (compare weights, activations, activations with shadow) (#52302) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/52302 Adds the basic functionality for the three Numeric Suite core APIs to work on FX models: 1. comparing weights 2. comparing activations, with same input fed to both models 3. comparing activations, with nodes of A shadowing nodes of B Note: there are a lot of TODOs in the code, and some/most of the APIs and implementation details may change as we iterate. This is just the first PR. Test Plan: We have unit test coverage for all of the APIs, for now this is with toy models: ``` python test/test_quantization.py TestFXNumericSuiteCoreAPIs ``` Reviewed By: raghuramank100 Differential Revision: D26463013 Pulled By: vkuzo fbshipit-source-id: e454115099ad18e4037d3c54986951cdffcab367