code: public Map<String, Double> accuracy(List<String> questions) {
          return modelUtils.accuracy(questions);
      }
docs: Accuracy based on questions which are a space separated list of strings
  where the first word is the query word, the next 2 words are negative,
  and the last word is the predicted word to be nearest
  @param questions the questions to ask
  @return the accuracy based on these questions