code: def test_is_valid(self):
      self.assertFalse(ModuleValidator.is_valid(self.original_model))
      self.assertTrue(ModuleValidator.is_valid(self.fixed_model))
  
imports: import unittest
  from collections import OrderedDict
  import torch
  import torch.nn
  from opacus.validators.errors import UnsupportedModuleError
  from opacus.validators.module_validator import ModuleValidator
  from torchvision.models import mobilenet_v3_small
label_desc: Use image node_id 2 for calling the ModuleValidator_test obj's underlying member method code with example usage: obj.test_is_valid() without return types