* Upgrade CI for PyTorch1.9
* fix typo
* merge build_cu101 and build_cu102 to build_cuda
* fix substitution bug
* test
* test
* test
* test
* test
* test
* test
* test
* test
* test
* test
* test
* remove redudant items
* add python 3.9 to CI
* add python 3.9 to setup.py
* remove some versions of pytorch for python 3.9 test
* fix torch version error
* delete mim files
* update ubuntu version
* fix mmcv cuda version
* [Feature] Move 'Install MMCV' to a independent CI item.
* Merge MMCV install into MMSEG dependencies install
* Fix bug of 'Install MMCV'
* Remove duplicate CI items
* Fix torch device
* Split cpu env and gpu env into two CI project
* Fix some mmdet related bugs
* Fix mmcv-full install bug of build_cpu CI project.
* update CI for pip 20.3
* fixed 1.6 torchvision
* delete python 3.8
* fixed mmcv
* add cuda home
* change to 1.2.2
* add pip upgrade
* install cuda for all
* add missing mmcv
* switch to deprecate