code: def observe(self, msg):
      print(
          display_messages(
              [msg],
              add_fields=self.opt.get("display_add_fields", ""),
              prettify=self.opt.get("display_prettify", False),
              verbose=self.opt.get("verbose", False),
          )
      )
  
file_path: ParlAI/parlai/agents/local_human/local_human.py
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.agents import Agent
  from parlai.core.message import Message
  from parlai.utils.misc import display_messages, load_cands
  from parlai.utils.strings import colorize
label_desc: Use image node_id 4 for calling the LocalHumanAgent obj's underlying member method code with example usage: obj.observe(msg) without return types