class_docstr: World Runner.
  
  Launches worlds, overworlds, etc. Helper for ChatServiceManager.
code: def is_initialized(self):
      return self.initialized
  
file_path: ParlAI/parlai/chat_service/core/world_runner.py
imports: import logging
  import time
  import datetime
  from concurrent import futures
  import parlai.chat_service.utils.logging
  import parlai.chat_service.utils.misc
label_desc: Use image node_id 3 for calling the ChatServiceWorldRunner obj's underlying member method code with example usage: obj.is_initialized() and returns: self