class_docstr: Example messenger onboarding world for chat task, displays intro and explains
  instructions.
class_docstr_tok: ["Example","messenger","onboarding","world","for","chat","task",",","displays","intro","and","explains","instructions","."]
code: def __init__(self, opt, agent):
      self.agent = agent
      self.episodeDone = False
      self.turn = 0
      self.data = {}
  
imports: from parlai.core.worlds import World
  from parlai.chat_service.services.messenger.worlds import OnboardWorld
label_desc: Use image node_id 1 to create a new MessengerChatOnboardWorld object from inherited base classes: OnboardWorld with example: obj = MessengerChatOnboardWorld(opt, agent)