code: def test_add_and_remove_hooks(self):
      test_model = ModelForTest()
      test_hook = ModelHook()
  
      add_hook_to_module(test_model, test_hook)
      self.assertEqual(test_model._hf_hook, test_hook)
      self.assertTrue(hasattr(test_model, "_old_forward"))
  
      # Check adding the hook did not change the name or the signature
      self.assertEqual(test_model.forward.__name__, "forward")
      self.assertListEqual(
          list(inspect.signature(test_model.forward).parameters), ["x"]
      )
  
      remove_hook_from_module(test_model)
      self.assertFalse(hasattr(test_model, "_hf_hook"))
      self.assertFalse(hasattr(test_model, "_old_forward"))
  
imports: import inspect
  import unittest
  import torch
  import torch.nn
  from accelerate.hooks import AlignDevicesHook, ModelHook, SequentialHook, add_hook_to_module, attach_align_device_hook, remove_hook_from_module, remove_hook_from_submodules
  from accelerate.test_utils import require_multi_gpu
label_desc: Use image node_id 1 for calling the HooksModelTester obj's underlying member method code with example usage: obj.test_add_and_remove_hooks() without return types