class_docstr: Base class for all other agents.
class_docstr_tok: ["Base","class","for","all","other","agents","."]
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
      return observation
  
imports: import copy
  from typing import List, Union
  from parlai.core.build_data import modelzoo_path
  from parlai.core.loader import load_agent_module
  from parlai.core.loader import register_agent
  from parlai.core.message import Message
  from parlai.core.opt import Opt
  from parlai.utils.misc import warn_once
  import parlai.utils.logging
  from parlai.utils.io import PathManager
label_desc: Use image node_id 2 for calling the Agent obj's underlying member method code with example usage: obj.observe(observation) and returns: observation