code: @Override
      public INDArray getWordVectors(Collection<String> labels) {
          List<INDArray> words = new ArrayList<>();
          for (String label : labels) {
              if (hasWord(label) || getUNK() != null)
                  words.add(getWordVectorMatrix(label));
          }
  
          return Nd4j.vstack(words);
      }
docs: This method returns 2D array, where each row represents corresponding word/label
  
  @param labels
  @return