pytorch

9d52651d - torch.ao migration: stubs.py phase 1 (#64861)

torch.ao migration: stubs.py phase 1 (#64861) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/64861 1. move the file ``` hg mv caffe2/torch/quantization/stubs.py caffe2/torch/ao/quantization/ ``` 2. create a new file in the old location and copy the imports 3. fix all call sites inside `torch` ghstack-source-id: 137885365 Test Plan: buck test mode/dev //caffe2/test:quantization Reviewed By: jerryzh168 Differential Revision: D30879678 fbshipit-source-id: a2d24f25d01064212aca15e94e8c78240ba48953