code: def _test_torch_compile_backend_caching_assert_reused(
      self, options: OrtBackendOptions
  ):
      self.assertFalse(
          OrtBackend.get_cached_instances()
      )  # assert setUp/tearDown
      new_backend = OrtBackend.get_cached_instance_for_options(options)
      reused_backend = OrtBackend.get_cached_instance_for_options(
          options
      )
      self.assertEqual(len(OrtBackend.get_cached_instances()), 1)
      self.assertIs(reused_backend, new_backend)
      if options is None or options.ort_session_options is None:
          # OrtBackendOptions.ort_session_options is a pybind11 object that
          # cannot be pickled via dataclasses.asdict
          self.assertEqual(
              new_backend,
              OrtBackend.get_cached_instance_for_options(
                  dataclasses.asdict(options) if options else None
              ),
          )
  
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 4 for calling the TestDynamoWithONNXRuntime obj's underlying member method code with example usage: obj._test_torch_compile_backend_caching_assert_reused(options) without return types