code: def setUp(self):
      if IS_MACOS:
          raise unittest.SkipTest(
              "non-portable load_library call used in test"
          )
  
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 4 for calling the WeakKeyDictionaryScriptObjectTestCase obj's underlying member method code with example usage: obj.setUp() without return types