[pytorch_ci] Python target determinator (#33577)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33577
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33221
This will make it so that if a pull request is just pure Python files, then we'll only run the Python tests that are connected to the dependency graph of the touched files.
Assumptions made:
- the Python code does not do dynamic imports
- test_X.py never imports from test_Y.py
Right now this is only done for test_nn (presumably the largest test entrypoint), but it's not much more work to do it for all the other test entrypoints too.
Test Plan:
CircleCI results when touching just a few Python files:
- pytorch_macos_10_13_py3_test: 41 ->13 minutes https://circleci.com/gh/pytorch/pytorch/4550574?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link
- pytorch_windows_vs2019_py36_cuda10.1_test1: 11 -> 2 minutes https://circleci.com/gh/pytorch/pytorch/4550846?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link
- pytorch_windows_vs2019_py36_cuda10.1_test2: 51 -> 21 minutes https://circleci.com/gh/pytorch/pytorch/4550845?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link
- pytorch_linux_xenial_py3_6_gcc5_4_test: 41 -> 14 minutes https://circleci.com/gh/pytorch/pytorch/4550543?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link
Differential Revision: D20009089
fbshipit-source-id: 41708cc301d1c866eb92a04421d8346feb0e3cb5
