Change all fp16 operation to using MMCV (open-mmlab#3766)

* Change all fp16 operation to using MMCV

* fix isort

* yapf and docformatter

* Revert "yapf and docformatter"

This reverts commit dede22f.

* yapf

Author: RyanXLi

docs/api.rst

@@ -34,11 +34,6 @@ post_processing
 .. automodule:: mmdet.core.post_processing
     :members:
 
-fp16
-^^^^^^^^^^
-.. automodule:: mmdet.core.fp16
-    :members:
-
 optimizer
 ^^^^^^^^^^
 .. automodule:: mmdet.core.optimizer

mmdet/apis/train.py

@@ -4,10 +4,10 @@
 import torch
 from mmcv.parallel import MMDataParallel, MMDistributedDataParallel
 from mmcv.runner import (HOOKS, DistSamplerSeedHook, EpochBasedRunner,
-                         OptimizerHook, build_optimizer)
+                         Fp16OptimizerHook, OptimizerHook, build_optimizer)
 from mmcv.utils import build_from_cfg
 
-from mmdet.core import DistEvalHook, EvalHook, Fp16OptimizerHook
+from mmdet.core import DistEvalHook, EvalHook
 from mmdet.datasets import build_dataloader, build_dataset
 from mmdet.utils import get_root_logger
 

mmdet/core/__init__.py

@@ -1,7 +1,6 @@
 from .anchor import *  # noqa: F401, F403
 from .bbox import *  # noqa: F401, F403
 from .evaluation import *  # noqa: F401, F403
-from .fp16 import *  # noqa: F401, F403
 from .mask import *  # noqa: F401, F403
 from .post_processing import *  # noqa: F401, F403
 from .utils import *  # noqa: F401, F403