code: def test_check_instances_list_same():
      """[Utils] check_instances: test correct list is returned as is."""
  
      instances = [("ols-1", OLS()), ("ols-2", OLS(offset=1))]
      out = _check_instances(instances)
  
      assert id(out) == id(instances)
      for i in range(2):
          for j in range(2):
              assert id(out[i][j]) == id(instances[i][j])
  
file_path: mlens/mlens/utils/tests/test_formatting.py
imports: from mlens.utils.dummy import OLS
  from mlens.utils.formatting import _check_format, _assert_format, _format_instances, _check_instances
label_desc: Use image node_id 12 for calling a global function with example usage: test_check_instances_list_same() without return types