@Override
 protected void unpackageClassifier(JarInputStream modelStream) throws IOException {
   super.unpackageClassifier(modelStream);
   JarStreams.getNextJarEntry(modelStream, MODEL_NAME);
   ObjectInputStream objectStream = new ObjectInputStream(modelStream);
   try {
     this.classifier = (Classifier) objectStream.readObject();
   } catch (ClassNotFoundException e) {
     throw new IOException(e);
   }
 }
 @Override
 protected void packageClassifier(File dir, JarOutputStream modelStream) throws IOException {
   super.packageClassifier(dir, modelStream);
   JarStreams.putNextJarEntry(modelStream, MODEL_NAME, new File(dir, MODEL_NAME));
 }