code: def test_exclude_vars(self, device):
      set_determinism(0)
      model = _TestModelTwo(10, 20, 10, 4)
      model.to(device)
      freeze_layers(model, exclude_vars="class")
  
      for name, param in model.named_parameters():
          if "class_layer" in name:
              self.assertEqual(param.requires_grad, True)
          else:
              self.assertEqual(param.requires_grad, False)
  
file_path: MONAI/tests/test_freeze_layers.py
imports: from __future__ import annotations
  import unittest
  import torch
  from parameterized import parameterized
  from monai.networks.utils import freeze_layers
  from monai.utils import set_determinism
  from tests.test_copy_model_state import _TestModelOne, _TestModelTwo
label_desc: Use image node_id 3 for calling the TestModuleState obj's underlying member method code with example usage: obj.test_exclude_vars(device) without return types