code: def _create_master(self, device):
      master = Master(port=self.port, device=device)
      master.run()
  
imports: import unittest
  from parl.utils import get_free_tcp_port
  from parl.utils import is_port_available
  from parl.utils import logger
  import multiprocessing
  from parl.remote.master import Master
  from parl.remote.worker import Worker
  from parl.remote.client import disconnect
  from parl.remote import remote_constants
  import time
  import os
  import signal
  import psutil
  import subprocess
label_desc: Use image node_id 3 for calling the XparlTestCase obj's underlying member method code with example usage: obj._create_master(device) without return types