GitLab

* first commit

* Add copyright pre-commit-hook

* [Feature]: support empty tensor in MMSyncBN

* refine code

* resolve comments

* clean unnecessary comments

* fix inaccurate statistics when empty tensor

* resolve comments and add docstrings

* update unit tests

* rephrase, ready for merge

* replace `re` with `regex`

* add regex in requirements

* use regex on windows and re on linux

* update requirements.txt

* add ext ops, support parrots

* fix lint

* fix lint

* update op from mmdetection

* support non-pytorch env

* fix import bug

* test not import mmcv.op

* rename mmcv.op to mmcv.ops

* fix compile warning

* 1. fix syncbn warning in pytorch 1.5
2. support only cpu compile
3. add point_sample from mmdet

* fix text bug

* update docstrings

* fix line endings

* minor updates

* remove non_local from ops

* bug fix for nonlocal2d

* rename ops_ext to _ext and _ext to _flow_warp_ext

* update the doc

* try clang-format github action

* fix github action

* add ops to api.rst

* fix cpp format

* fix clang format issues

* remove .clang-format
Co-authored-by: Kai Chen <chenkaidev@gmail.com>