* change version to v0.20.0

* change version to v0.20.0

* change version to v0.20.0

* [Fix] Convert SyncBN to BN when training on DP.

* Modify SyncBN2BN.

* Add SyncBN2BN unit test.

* Resolve some comments.

* use mmcv official revert_sync_batchnorm

* Remove local syncbn2bn unit tests.

* Update mmcv version.

* Fix bugs of gather model tools.

* Modify warnings.

* Modify docker mmcv version.

* Update mmcv version table.

* update dockerfile

* Update docker/Dockerfile

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

* add ARG

* change dash to bash

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

* Add dynamic mmcv install

* Declare ARG after FROM

* Add docker/serve

* Add handler

* Add mmseg2torchserve

* Fix mmv minimum version

* Update docs with model serving section

* Update useful_tools.md

* pre-commit

* Update useful_tools.md

* Add 3dogs to resources

* Move mask to resources

* update docker

* Update Dockerfile

* add badge

* Created using Colaboratory

* add read docs

* Fixed readthedocs

* fixed colab ref

* add readthedocs.txt

* add link

* fixed modelzoo link

* add missing reference

* fixed docs

* remove relative path in docs

* add colab in README.md

* update docker image

* add newline

* fixed br