code: def _create_model_cfg(self):
      cfg_file = "panoptic_fpn/panoptic-fpn_r50_fpn_1x_coco.py"
      model_cfg = get_detector_cfg(cfg_file)
      model_cfg.backbone.depth = 18
      model_cfg.neck.in_channels = [64, 128, 256, 512]
      model_cfg.backbone.init_cfg = None
      return model_cfg
  
file_path: mmdetection/tests/test_models/test_detectors/test_panoptic_two_stage_segmentor.py
imports: import unittest
  import torch
  from parameterized import parameterized
  from mmdet.registry import MODELS
  from mmdet.structures import DetDataSample
  from mmdet.testing._utils import demo_mm_inputs, get_detector_cfg
  from mmdet.utils import register_all_modules
label_desc: Use image node_id 2 for calling the TestTwoStagePanopticSegmentor obj's underlying member method code with example usage: obj._create_model_cfg() and returns: model_cfg