code: def setup_data(self, input_path):
      self.question = "What is the summary?"
      new_episode = True
      num_missing = 0
      num_added = 0
  
      print("loading: " + input_path)
  
      with PathManager.open(input_path) as stories_file:
          for story in stories_file:
              try:
                  story_file = open(
                      os.path.join(self.datapath, story.strip())
                  )
              except EnvironmentError:
                  num_missing += 1
                  continue
  
              num_added += 1
              article, highlights = [], []
              is_highlight = False
              for line in story_file:
                  line = _fix_missing_period(line.strip())
                  if line == "":
                      continue
                  if line.startswith("@highlight"):
                      is_highlight = True
                      continue
                  if is_highlight:
                      highlights.append(line)
                  else:
                      article.append(line)
              text = (
                  unicodedata.normalize("NFKC", " ".join(article))
                  + "\n"
                  + self.question
              )
              label = [
                  unicodedata.normalize("NFKC", " ".join(highlights))
              ]
              yield ((text, label, None, None), new_episode)
  
      print(
          "{} stories added, {} stories missing.".format(
              num_added, num_missing
          )
      )
  
file_path: ParlAI/parlai/tasks/cnn_dm/agents.py
imports: from parlai.core.teachers import DialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import os
  import unicodedata
label_desc: Use image node_id 3 for calling the CNNDMTeacher obj's underlying member method code with example usage: obj.setup_data(input_path) without return types