GitLab

* [fix] fix collect_env() on Windows

* fix(utils): add back 'Cuda compilation tools' to nvcc info

* feat(utils): find default ccompiler

* fix(utils, test): parse cl.exe version instead of path

* fix: code style

* fix(tools): use distutils

* [fix] collect_env() returns GCC or MSVC

* [fix] unitest for collect_env()

* add comments

* test: add GCC to expected_keys

* fix: code style

* Update mmcv/utils/env.py

* first commit

* Add copyright pre-commit-hook

* move unit tests to specific folders

* fix path error

* remove some assertions

* fix ignore path

* [feature] Add collect_env() to collect environment info

* fix unit tests

* fix the case when ops are not compiled

* fix docstring