code: def test_efficient_det_param_groups(backbone):
      model = efficientdet.model(
          backbone=backbone(pretrained=False),
          num_classes=42,
          img_size=256,
      )
  
      assert len(list(model.param_groups())) == 3
  
imports: import pytest
  from icevision.all import *
  from icevision.models.ross import efficientdet
  from icevision.models.ross.efficientdet.backbones import *
label_desc: Use image node_id 1 for calling a global function with example usage: test_efficient_det_param_groups(backbone) without return types