code: def set_arg1(self, value):
      self.arg1 = value
  
imports: import unittest
  import parl
  from parl.remote.master import Master
  from parl.remote.worker import Worker
  from parl.remote.client import disconnect
  from parl.utils import logger
  import multiprocessing
  import subprocess
  import time
  import threading
  import subprocess
  import sys
  import os
  import signal
label_desc: Use image node_id 4 for calling the Actor obj's underlying member method code with example usage: obj.set_arg1(value) without return types