code: def act(self):
      act_retriever = self.retriever.act()
      obs = self.observation
      obs["episode_done"] = True
      retrieved_txt = act_retriever.get("text", "")
      cands = act_retriever.get("text_candidates", [])
      if len(cands) > 0:
          retrieved_txts = cands[: self.opt["num_retrieved"]]
      else:
          retrieved_txts = [retrieved_txt]
      text = obs["text"]
      reader_acts = []
      retrieved_txts = [r for r in retrieved_txts if r != ""]
      for ret_txt in retrieved_txts:
          if self.opt.get("split_paragraphs", False):
              paragraphs = self._split_doc(ret_txt)
          else:
              paragraphs = [ret_txt]
          for para in paragraphs:
              obs["text"] = para + "\n" + text
              self.reader.observe(obs)
              act_reader = self.reader.act()
              act_reader["paragraph"] = para
              reader_acts.append(act_reader)
      if len(reader_acts) > 0:
          best_act = max(
              reader_acts, key=lambda x: x["candidate_scores"][0]
          )
      else:
          best_act = {"id": self.getID()}
  
      return best_act
  
file_path: ParlAI/parlai/agents/retriever_reader/retriever_reader.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.agents import create_agent
  import regex
label_desc: Use image node_id 5 for calling the RetrieverReaderAgent obj's underlying member method code with example usage: obj.act() and returns: best_act