* support custom op `mmcv::cummax` for onnxruntime in mmcv
* fix clang-format lint error
* support mmcv::cummin, reformat codes
* fix merge from master
* add docs for mmcv::cummax and mmcv::cummin
* format doc
* add assertion for torch version, when exporting `cummax` to onnx
* add more comments for torch version
* handle exporting to onnx in `soft_nms`
* commit for test_onnx
* remove `is_in_onnx_export` in softnms
* add more comments
* fix c++ lint error
* add known issues doc for `cummax`
* fix known issues doc
* supports for onnxruntime custom op `mmcv::MMCVTopPool`
* supports for onnxruntime custom op `mmcv::MMCVCornerPool`, involving TopPool, BottomPool, LeftPool and RightPool
* add unittest for corner_pool
* supports mmcv::CornerPool without memcpy
* add docs for mmcv::CornerPool
* re-add docs for mmcv::CornerPool
* fix output dtype doc
* reformat
* format with pre-commit
* format
* fix lint error, by using google clang-format style for c/c++
Zaida Zhou
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