text: # Copyright (c) OpenMMLab. All rights reserved.
  from ..builder import DETECTORS
  from .two_stage import TwoStageDetector
  
  
  @DETECTORS.register_module()
  class GridRCNN(TwoStageDetector):
      """Grid R-CNN.
  
      This detector is the implementation of:
      - Grid R-CNN (https://arxiv.org/abs/1811.12030)
      - Grid R-CNN Plus: Faster and Better (https://arxiv.org/abs/1906.05688)
      """
  
      def __init__(self,
                   backbone,
                   rpn_head,
                   roi_head,
                   train_cfg,
                   test_cfg,
                   neck=None,
                   pretrained=None,
                   init_cfg=None):
          super(GridRCNN, self).__init__(
              backbone=backbone,
              neck=neck,
              rpn_head=rpn_head,
              roi_head=roi_head,
              train_cfg=train_cfg,
              test_cfg=test_cfg,
              pretrained=pretrained,
              init_cfg=init_cfg)
  