code: def testJoinSomeRegistered(self):
      coord = coordinator.Coordinator()
      threads = [
          threading.Thread(target=SleepABit, args=(0.01, coord)),
          threading.Thread(target=SleepABit, args=(0.02,)),
          threading.Thread(target=SleepABit, args=(0.01, coord)),
      ]
      for t in threads:
          t.start()
      WaitForThreadsToRegister(coord, 2)
      # threads[1] is not registered we must pass it in.
      coord.join([threads[1]])
      for t in threads:
          self.assertFalse(t.is_alive())
  
imports: import sys
  import threading
  import time
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.platform import test
  from tensorflow.python.training import coordinator
label_desc: Use image node_id 5 for calling the CoordinatorTest obj's underlying member method code with example usage: obj.testJoinSomeRegistered() without return types