* Use docker to skip CUDA installation in CI

* Update .github/workflows/build.yml

Co-authored-by: Jerry Jiarui XU <xvjiarui0826@gmail.com>

* Remove Install system dependencies

* Add Install system dependencies for cuda usage

* Add Install system dependencies and requirements

* fix requirements error

Co-authored-by: Jerry Jiarui XU <xvjiarui0826@gmail.com>

* Improve docs style

* update lists

* update the size of image

* modify duplicate mmdet3d

* 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.

* add more CI

* fix missing

* remove python-version

* fixed acc

* 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

* [Improvement] Add markdown linter and fix linting errors

* fixed pip

* Fixed voc aug convert

* update getting_started.md

* add class balanced doc

* add pypi deployment

* remove useless jobs

* fixed typo and cleanup

* delete build.tx

* add change log

Co-authored-by: Jiarui XU <xvjiarui0826@gmail.com>