class_docstr: Container for keeping the content of one interaction between agents.
class_docstr_tok: ["Container","for","keeping","the","content","of","one","interaction","between","agents","."]
code: def _format_action(self, receiver):
      return f"{self._sender} => {receiver}"
  
imports: from typing import Dict, Union
  import parlai.utils.logging
  from parlai.crowdsourcing.projects.wizard_of_internet.wizard_internet_blueprint import WIZARD_INTERNET_PARLAICHAT_BLUEPRINT
  from parlai.crowdsourcing.utils.analysis import AbstractResultsCompiler
  from mephisto.abstractions.blueprint import AgentState
label_desc: Use image node_id 2 for calling the ChatMessage obj's underlying member method code with example usage: obj._format_action(receiver) and returns: self, str, receiver