code: public List<List<IN>> classifyRaw(String str,
                                      DocumentReaderAndWriter<IN> readerAndWriter) {
      ObjectBank<List<IN>> documents =
        makeObjectBankFromString(str, readerAndWriter);
      List<List<IN>> result = new ArrayList<List<IN>>();
  
      for (List<IN> document : documents) {
        classify(document);
  
        List<IN> sentence = new ArrayList<IN>();
        for (IN wi : document) {
          // TaggedWord word = new TaggedWord(wi.word(), wi.answer());
          // sentence.add(word);
          sentence.add(wi);
        }
        result.add(sentence);
      }
      return result;
    }
docs: Classify the tokens in a String. Each sentence becomes a separate document.
  Doesn't override default readerAndWriter.
  
  @param str
  A String with tokens in one or more sentences of text to be
  classified.
  @return {@link List} of classified sentences (each a List of something that
  extends {@link CoreMap}).