code: def test_get_element(self) -> None:
      state_dict = {"a": [0, 1], "b": [2, {"c": "d"}]}
      self.assertEqual(
          _traverse.get_element(state_dict, ("a",)), [0, 1]
      )
      self.assertEqual(_traverse.get_element(state_dict, ("b", 0)), 2)
      self.assertEqual(
          _traverse.get_element(state_dict, ("b", 1, "c")), "d"
      )
  
      self.assertIsNone(_traverse.get_element(state_dict, ("c",)))
      self.assertIsNone(_traverse.get_element(state_dict, ("a", 33)))
      self.assertIsNone(_traverse.get_element(state_dict, ("b", 88)))
      self.assertIsNone(_traverse.get_element(state_dict, ("b", 0, 2)))
      self.assertIsNone(_traverse.get_element(state_dict, ("b", 1, 2)))
      self.assertIsNone(
          _traverse.get_element(state_dict, ("b", 1, "d"))
      )
  
file_path: pytorch/test/distributed/checkpoint/test_traverse.py
imports: from collections import OrderedDict
  import torch
  import torch.distributed.checkpoint._traverse
  from torch.distributed.checkpoint.metadata import STATE_DICT_TYPE
  from torch.testing._internal.common_utils import run_tests, TestCase
label_desc: Use image node_id 7 for calling the TestTraverse obj's underlying member method code with example usage: obj.test_get_element() without return types