/** uses the meta-classifier */
protected static void useClassifier(Instances data) throws Exception {
System.out.println("\n1. Meta-classfier");
AttributeSelectedClassifier classifier = new AttributeSelectedClassifier();
CfsSubsetEval eval = new CfsSubsetEval();
GreedyStepwise search = new GreedyStepwise();
search.setSearchBackwards(true);
J48 base = new J48();
classifier.setClassifier(base);
classifier.setEvaluator(eval);
classifier.setSearch(search);
Evaluation evaluation = new Evaluation(data);
evaluation.crossValidateModel(classifier, data, 10, new Random(1));
System.out.println(evaluation.toSummaryString());
}
@Test
public void train_attributeSelectedJ48_innerClassifierIsJ48() {
// Arrange
String classifierString =
"weka.classifiers.meta.AttributeSelectedClassifier -E \"weka.attributeSelection.CfsSubsetEval\" -S \"weka.attributeSelection.BestFirst -D 1 -N 5\" -W weka.classifiers.trees.J48 -- -C 0.25 -M 2";
// Act
GeneralTrainer attributeSelectedTrainer = createGeneralTrainer(classifierString);
AttributeSelectedClassifier attributeSelectedClassifier =
(AttributeSelectedClassifier) attributeSelectedTrainer.train(getTestInstances());
// Assert
assertTrue(
"Classifier within wrapper should be J48",
attributeSelectedClassifier.getClassifier() instanceof J48);
}
