code: def tearDown(self):
      super().tearDown()
      torch._dynamo.reset()
      OrtBackend.clear_cached_instances()
  
imports: from __future__ import annotations
  import copy
  import dataclasses
  import os
  import sys
  from typing import Tuple
  import onnxruntime
  import torch
  import torch._dynamo.backends.registry
  from parameterized import parameterized
  from torch import nn
  from torch.onnx import _OrtBackend, _OrtBackendOptions, ExportOptions
  from torch.testing._internal import common_utils
  import onnx_test_common
label_desc: Use image node_id 2 for calling the TestDynamoWithONNXRuntime obj's underlying member method code with example usage: obj.tearDown() without return types