code: def test_load_model(self):
      from torchvision.models.detection.faster_rcnn import RoIHeads
  
      from sahi.models.torchvision import TorchVisionDetectionModel
  
      torchvision_detection_model = TorchVisionDetectionModel(
          config_path=TorchVisionTestConstants.FASTERRCNN_CONFIG_PATH,
          confidence_threshold=CONFIDENCE_THRESHOLD,
          device=MODEL_DEVICE,
          category_remapping=None,
          load_at_init=True,
      )
      self.assertEqual(
          isinstance(
              torchvision_detection_model.model.roi_heads, RoIHeads
          ),
          True,
      )
  
file_path: sahi/tests/test_torchvision.py
imports: import unittest
  import numpy
  from sahi.utils.cv import read_image
  from sahi.utils.torchvision import TorchVisionTestConstants
label_desc: Use image node_id 1 for calling the TestTorchVisionDetectionModel obj's underlying member method code with example usage: obj.test_load_model() without return types