code: public Collection<String> nearestLabels(@NonNull Collection<VocabWord> document, int topN) {
          if (document.isEmpty())
              throw new ND4JIllegalStateException("Impossible to get nearestLabels for empty list of words");
  
          INDArray vector = inferVector(new ArrayList<VocabWord>(document));
          return nearestLabels(vector, topN);
      }
docs: This method returns top N labels nearest to specified set of vocab words
  
  @param document
  @param topN
  @return