code: def _get_art_abs(story_file):
    
    # Based on https://github.com/abisee/cnn-dailymail/blob/master/
    #     make_datafiles.py
  
    lines = _read_text_file(story_file)
  
    # Lowercase everything
    lines = [line.lower() for line in lines]
  
    # Put periods on the ends of lines that are missing them
    # (this is a problem in the dataset because many image captions don't end in
    # periods; consequently they end up in the body of the article as run-on
    # sentences)
    def fix_missing_period(line):
      """Adds a period to a line that is missing a period."""
      if '@highlight' in line: return line
      if not line: return line
      if line[-1] in END_TOKENS: return line
      return line + ' .'
    lines = [fix_missing_period(line) for line in lines]
  
    # Separate out article and abstract sentences
    article_lines = []
    highlights = []
    next_is_highlight = False
    for line in lines:
      if not line:
        continue  # empty line
      elif line.startswith('@highlight'):
        next_is_highlight = True
      elif next_is_highlight:
        highlights.append(line)
      else:
        article_lines.append(line)
  
    # Make article into a single string
    article = ' '.join(article_lines)
  
    # Make abstract into a single string, putting <s> and </s> tags around
    # the sentences.
    abstract = ' '.join(['%s %s %s' % (SENTENCE_START, sent,
                                       SENTENCE_END) for sent in highlights])
  
    return article, abstract
docs: Get abstract (highlights) and article from a story file path.