code: def get_arg1(self):
      return self.arg1
  
imports: import unittest
  import parl
  import time
  import subprocess
  import threading
  from parl.remote.master import Master
  from parl.remote.worker import Worker
  from parl.remote.client import disconnect
  from parl.remote import exceptions
  from parl.utils import get_free_tcp_port
label_desc: Use image node_id 2 for calling the Actor obj's underlying member method code with example usage: obj.get_arg1() and returns: self