code: def test_classy_model_wrapper_attr(self):
      model = MyTestModel2()
      model.test_attr = 123
      model_wrapper = ClassyModelWrapper(model)
      self.assertTrue(hasattr(model_wrapper, "test_attr"))
      self.assertEqual(model_wrapper.test_attr, 123)
  
      # delete the attr
      delattr(model_wrapper, "test_attr")
      self.assertFalse(hasattr(model_wrapper, "test_attr"))
      self.assertFalse(hasattr(model, "test_attr"))
  
imports: import copy
  import os
  import shutil
  import tempfile
  import unittest
  import torch
  import torch.nn
  from classy_vision.generic.util import load_checkpoint
  from classy_vision.heads import FullyConnectedHead, IdentityHead
  from classy_vision.hooks import CheckpointHook
  from classy_vision.models import build_model, ClassyModel, ClassyModelWrapper, register_model
  from classy_vision.models.classy_model import _ClassyModelAdapter
  from classy_vision.tasks import build_task
  from classy_vision.trainer import LocalTrainer
  from test.generic.config_utils import get_fast_test_task_config, get_test_task_config
  from torchvision import models
label_desc: Use image node_id 9 for calling the TestClassyModel obj's underlying member method code with example usage: obj.test_classy_model_wrapper_attr() without return types