code: def get_arg2(self):
      return self.arg2
  
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 3 for calling the Actor obj's underlying member method code with example usage: obj.get_arg2() and returns: self