code: def tearDown(self):
      disconnect()
  
file_path: PARL/parl/core/fluid/tests/fluid_gpu_actor_test_fluid.py
imports: import unittest
  import parl
  from parl.remote.master import Master
  from parl.remote.worker import Worker
  import time
  import threading
  from parl.remote.client import disconnect
  from parl.remote import exceptions
  import subprocess
  from parl.utils import logger
  import paddle.fluid
  import os
label_desc: Use image node_id 1 for calling the TestCluster obj's underlying member method code with example usage: obj.tearDown() without return types