GitLab

* Add mmseg in the doc config files

* Remove mocked cv2

* Add opencv-python

* Remove mocked imports

* Add mminstall requirements

* Remove mocked imports correspondingly

* Fix mmdet versions

* Fix mmseg version

* Refine docs and license

* Change order of install

* Clean unnecessary requirements

* Install mmdet manually in readthedocs

* delete mmdet install

* reformat docstring in code

* Refine docs

* Reformat

* fix format issue

* Update doc requirements

* Resolve API issue in readthedocs

* Fix package order

* Update requirements

* Update sphinx

* Add mock