docs: 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);
      }