* add compare table fix model_zoo.md

* fix some typos

* minor add

* minor update

* add link for mmdet

* minor update

* migrate to mmcv.cnn.bricks

* remove conv_module, scale, upsample

* update mmdet version and mmcv requirement

* fixed fsaf warning

* Pass momentum_config to register_training_hooks

* Bump mmcv version

* Explicit default

* add norm_eval

* upgrade mmcv

* Use official DDP to implement MMDDP

* update mmcv requirement

* Update the version of MMCV

Co-authored-by: Kai Chen <chenkaidev@gmail.com>

* use git repo instead of pip wheels

* install pycocotools before building mmdet

* fix travis installation

* reorganize requirements, make albumentations optional

* fix flake8 error

* force older version of Pillow until torchvision is fixed

* make imagecorruptions optional and update INSTALL.dm

* update INSTALL.md

* Add note about pillow version

* Add build requirements to install instructions