Momentum updater hook (#2571)

* Pass momentum_config to register_training_hooks

* Bump mmcv version

* Explicit default

mmdet/apis/train.py

@@ -140,7 +140,8 @@ def train_detector(model,
 
     # register hooks
     runner.register_training_hooks(cfg.lr_config, optimizer_config,
-                                   cfg.checkpoint_config, cfg.log_config)
+                                   cfg.checkpoint_config, cfg.log_config,
+                                   cfg.get('momentum_config', None))
     if distributed:
         runner.register_hook(DistSamplerSeedHook())
 

requirements/runtime.txt

 matplotlib
-mmcv>=0.4.0
+mmcv>=0.4.4
 numpy
 # need older pillow until torchvision is fixed
 Pillow<=6.2.2