code: def test_faster_rcnn_default_param_groups():
      model = faster_rcnn.model(num_classes=4)
  
      param_groups = model.param_groups()
      assert len(param_groups) == 8
  
imports: from icevision.all import *
  from icevision.models.torchvision import faster_rcnn
  import albumentations
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: test_faster_rcnn_default_param_groups() without return types