Source code for mmtrack.engine.hooks.yolox_mode_switch_hook
# Copyright (c) OpenMMLab. All rights reserved.
from mmdet.engine import YOLOXModeSwitchHook as _YOLOXModeSwitchHook
from mmengine.model import is_model_wrapper
from mmtrack.registry import HOOKS
[docs]@HOOKS.register_module()
class YOLOXModeSwitchHook(_YOLOXModeSwitchHook):
"""Switch the mode of YOLOX during training.
This hook turns off the mosaic and mixup data augmentation and switches
to use L1 loss in bbox_head.
The difference between this class and the class in mmdet is that the
class in mmdet use `model.bbox_head.use_l1=True` to switch mode, while
this class will check whether there is a detector module in the model
firstly, then use `model.detector.bbox_head.use_l1=True` or
`model.bbox_head.use_l1=True` to switch mode.
"""
[docs] def before_train_epoch(self, runner):
"""Close mosaic and mixup augmentation and switches to use L1 loss."""
epoch = runner.epoch
train_loader = runner.train_dataloader
model = runner.model
if is_model_wrapper(model):
model = model.module
if (epoch + 1) == runner.max_epochs - self.num_last_epochs:
runner.logger.info('No mosaic and mixup aug now!')
# The dataset pipeline cannot be updated when persistent_workers
# is True, so we need to force the dataloader's multi-process
# restart. This is a very hacky approach.
train_loader.dataset.update_skip_type_keys(self.skip_type_keys)
if hasattr(train_loader, 'persistent_workers'
) and train_loader.persistent_workers is True:
train_loader._DataLoader__initialized = False
train_loader._iterator = None
self._restart_dataloader = True
runner.logger.info('Add additional L1 loss now!')
if hasattr(model, 'detector'):
model.detector.bbox_head.use_l1 = True
else:
model.bbox_head.use_l1 = True
else:
# Once the restart is complete, we need to restore
# the initialization flag.
if self._restart_dataloader:
train_loader._DataLoader__initialized = True