code: def test_retinanet_default_param_groups():
      model = retinanet.model(num_classes=4)
  
      param_groups = model.param_groups()
      assert len(param_groups) == 7
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_retinanet_default_param_groups() without return types