code: def test_weak_keyed_dict_update(self):
      self.check_update(WeakIdKeyDictionary, {C(): 1, C(): 2, C(): 3})
  
imports: import copy
  import gc
  import random
  import threading
  import unittest
  import torch
  from torch.testing._internal.common_utils import find_library_location, IS_FBCODE, IS_MACOS, IS_SANDCASTLE, IS_WINDOWS, run_tests, TestCase
  from torch.utils.weak import _WeakHashRef, WeakIdKeyDictionary
label_desc: Use image node_id 8 for calling the WeakTest obj's underlying member method code with example usage: obj.test_weak_keyed_dict_update() without return types