GitLab

* add clockwise arguments to ops box_iou_rotated and nms_rotated

* refactor docs

* change code that may incur stopped gradient.

* refactor docs

* Update mmcv/ops/nms.py
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* Update mmcv/ops/box_iou_rotated.py
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>