code: def testMultiThreaded(self):
      threads = []
      self._exceptions = []
      for _ in range(8):
          thread = Thread(target=self.use_my_context)
          thread.start()
          threads.append(thread)
      for t in threads:
          t.join()
      for e in self._exceptions:
          raise e
  
file_path: pytorch/caffe2/python/context_test.py
imports: from caffe2.python import context, test_util
  from threading import Thread
label_desc: Use image node_id 2 for calling the TestContext obj's underlying member method code with example usage: obj.testMultiThreaded() without return types