docstr: Receive an observation/action dict.
docstr_tok: ["Receive","an","observation\/action","dict","."]
code: def observe(self, observation):
      """
      Receive an observation/action dict.
      """
      self.observation = observation
      self.turns += f"\n{observation['id']}: {observation['text']}"
      return observation
  
file_path: ParlAI/parlai/agents/gpt3/gpt3.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
label_desc: Use image node_id 4 for calling the Gpt3Agent obj's underlying member method code with example usage: obj.observe(observation) and returns: observation