code: def set_arg1(self, value):
      self.arg1 = value
  
imports: import unittest
  import parl
  import time
  import threading
  from parl.remote import exceptions
  import subprocess
  from parl.utils import logger
  from parl.utils.test_utils import XparlTestCase
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