@classmethod
def tearDownClass(cls):
    cls._server.stop_server().wait()
    cls._server_thread.join()
    cls._server_2.stop_server().wait()
    cls._server_thread_2.join()
    test_util.TensorFlowTestCase.tearDownClass()
@classmethod
def tearDownClass(cls):
    cls._server.stop_server().wait()
    cls._server_thread.join()
    cls._server_2.stop_server().wait()
    cls._server_thread_2.join()
    test_util.TensorFlowTestCase.tearDownClass()