docs: @Deprecated
      public static void writeWordVectors(ParagraphVectors vectors, OutputStream stream) {
          try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(stream, StandardCharsets.UTF_8))) {
              /*
              This method acts similary to w2v csv serialization, except of additional tag for labels
               */
  
              VocabCache<VocabWord> vocabCache = vectors.getVocab();
              for (VocabWord word : vocabCache.vocabWords()) {
                  StringBuilder builder = new StringBuilder();
  
                  builder.append(word.isLabel() ? "L" : "E").append(" ");
                  builder.append(word.getLabel().replaceAll(" ", WHITESPACE_REPLACEMENT)).append(" ");
  
                  INDArray vector = vectors.getWordVectorMatrix(word.getLabel());
                  for (int j = 0; j < vector.length(); j++) {
                      builder.append(vector.getDouble(j));
                      if (j < vector.length() - 1) {
                          builder.append(" ");
                      }
                  }
  
                  writer.write(builder.append("\n").toString());
              }
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }