code: def tearDown(self):
      super().tearDown()
      torch.onnx.unregister_custom_op_symbolic(
          "aten::add", opset_version=self.opset_version
      )
  
imports: import contextlib
  import io
  import tempfile
  import unittest
  import numpy
  import onnx
  import parameterized
  import pytorch_test_common
  import torch
  from packaging import version
  from torch.onnx import _constants, _experimental, verification
  from torch.testing._internal import common_utils
label_desc: Use image node_id 2 for calling the TestVerificationOnWrongExport obj's underlying member method code with example usage: obj.tearDown() without return types