* Support image reading while ignoring EXIF orientation info
Add unit test for ignore_orientation flags in imread()
* add documentation for imread
* Add test cases
* add adjust sharpness
* revised according to commnts
* fix bug
* fix docstring
* revise according to comments
* fix blank lines
* revised according to comments
* add brightness and contrast augmentation
* remove unnecessary
* reformat
* relax the precision constrain for adjust_brightness aug
* fix percision assertion error in unit test
* remove toy
* rename alpha as factor
* use np.testing.assert_allclose in place of np.less_equal
* add equalize augmentation in mmcv
* delete unnecessary
* reformat
* remove clip in implementing equalize, and add uint test with case step=0
* remove clip in implementing equalize, and add uint test with case step=0
* add comments for unit test
* rename function name as imequalize
* add Color augmentation
* reformat
* reformat
* reformat docstring
* reformat docstring
* add more unit test
* add more unit test
* add clip value and uint test for image with type float
* rename function name
* migrate op
* migrate unittest
* update build no torch
* add back use_torch_vision for roi align
* fix type and unit test
* ignore test logging when no torch
* fix no torch ci test
* skip test registry
* remove coverage report when no torch
* fix mac ci order
* install latest pillow when no torch
* mv convws to brisk
* 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>