code: def test_loads_models_by_identifiers(
      self, exists_mock, openMock, pickleLoadMock
  ):
      exists_mock.return_value = True
      seed = 13
      idx = 17
      budget = 50.0
      expected_model = self._setup_load_model_mocks(
          openMock, pickleLoadMock, seed, idx, budget
      )
      expected_dict = {(seed, idx, budget): expected_model}
  
      actual_dict = self.backend.load_models_by_identifiers(
          [(seed, idx, budget)]
      )
  
      self.assertIsInstance(actual_dict, dict)
      self.assertDictEqual(expected_dict, actual_dict)
  
file_path: auto-sklearn/test/test_util/test_backend.py
imports: import builtins
  from autosklearn.automl_common.common.utils.backend import Backend
  import unittest
  import unittest.mock
label_desc: Use image node_id 3 for calling the BackendModelsTest obj's underlying member method code with example usage: obj.test_loads_models_by_identifiers(exists_mock, openMock, pickleLoadMock) without return types