code: def test_config_save_pretrained(self):
      config_class = self.config_class
      config_first = config_class(out_indices=[0, 1, 2, 3])
  
      with tempfile.TemporaryDirectory() as tmpdirname:
          config_first.save_pretrained(tmpdirname)
          config_second = self.config_class.from_pretrained(tmpdirname)
  
      self.assertEqual(config_second.to_dict(), config_first.to_dict())
  
file_path: transformers/tests/test_backbone_common.py
imports: import copy
  import inspect
  import tempfile
  from transformers.testing_utils import require_torch, torch_device
  from transformers.utils.backbone_utils import BackboneType
label_desc: Use image node_id 3 for calling the BackboneTesterMixin obj's underlying member method code with example usage: obj.test_config_save_pretrained() without return types