public void saveFile() throws Exception {
ArffSaver saverLearn = new ArffSaver();
saverLearn.setInstances(learnFinal);
saverLearn.setFile(new File(learnPostSelectionFileName));
saverLearn.writeBatch();
ArffSaver saverHold = new ArffSaver();
saverHold.setInstances(holdFinal);
saverHold.setFile(new File(holdPostSelectionFileName));
saverHold.writeBatch();