code: @Override protected void postProcessing() {
          if (argOptions.hasOption("saveVectors")) {
              String fileName = argOptions.getStringOption("saveVectors");
              LOGGER.info("saving index vectors to " + fileName);
              IndexVectorUtil.save(isa.getWordToIndexVector(), 
                                   new File(fileName));
          }        
      }
docs: If {@code --saveVectors} was specified, write the accumulated
  word-to-index vector mapping to file.