class_docstr: Base class for RoI extractor.
  
  Args:
      roi_layer (dict): Specify RoI layer type and arguments.
      out_channels (int): Output channels of RoI layers.
      featmap_strides (int): Strides of input feature maps.
code: def init_weights(self):
      pass
  
file_path: insightface/detection/scrfd/mmdet/models/roi_heads/roi_extractors/base_roi_extractor.py
imports: from abc import ABCMeta, abstractmethod
  import torch
  import torch.nn
  from mmcv import ops
label_desc: Use image node_id 3 for calling the BaseRoIExtractor obj's underlying member method code with example usage: obj.init_weights() without return types