code: def test_make_modified_input_empty_overrides(self):
      ex = {
          "foo": 123,
          "bar": 234,
          "_id": "a1b2c3",
          "_meta": {"parentId": "000000"},
      }
      copy_of_original = copy.deepcopy(ex)
      new_ex = utils.make_modified_input(ex, {}, "testFn")
      self.assertEqual(new_ex, copy_of_original)
      self.assertIs(new_ex, ex)
  
imports: from collections.abc import Callable, Sequence
  import copy
  from typing import Any, Optional, TypeVar, Union
  from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.api import types
  from lit_nlp.lib import utils
  import numpy
label_desc: Use image node_id 21 for calling the UtilsTest obj's underlying member method code with example usage: obj.test_make_modified_input_empty_overrides() without return types