たまにwekaAPIを使って簡単な実験をしようと思い立つと、やり方を忘れているのでもメモしておく。 public void runJ48(String training, String test, String result) { try { //load data ArffLoader al = new ArffLoader(); al.setFile(new File(training)); Instances trainInstances = new Instances(al.getDataSet()); al.setFile(new File(test)); Instances testInstances = new Instances(al.getDataSet()); //set class trainInstances.setClassIndex(trainInstances