Example usage for weka.attributeSelection AttributeSelection CrossValidateAttributes

Introduction

In this page you can find the example usage for weka.attributeSelection AttributeSelection CrossValidateAttributes.

Prototype

public String CrossValidateAttributes() throws Exception 

Source Link

Document

Perform a cross validation for attribute selection.

Usage

From source file:old.CFS.java

/**
 * uses the low level approach//from ww w  .  ja  v a 2 s.  com
   * @param data
 */
protected static void useLowLevel(Instances data) throws Exception {
    System.out.println("\n3. Low-level");
    AttributeSelection attsel = new AttributeSelection();
    ChiSquaredAttributeEval eval = new ChiSquaredAttributeEval();
    Ranker search = new Ranker();
    search.setThreshold(-1.7976931348623157E308);
    search.setNumToSelect(1000);
    attsel.setEvaluator(eval);
    attsel.setSearch(search);
    attsel.setFolds(10);
    attsel.setXval(true);
    attsel.SelectAttributes(data);
    //    System.out.println(data.toSummaryString());
    //    attsel.selectAttributesCVSplit(data);
    //    attsel.SelectAttributes(data);

    System.out.println(attsel.CrossValidateAttributes());
    //    attsel.SelectAttributes(data);
    //    attsel.selectAttributesCVSplit(data);
    Instances newData = attsel.reduceDimensionality(data);

    int[] indices = attsel.selectedAttributes();
    System.out.println(newData);
    System.out.println("selected attribute indices (starting with 0):\n" + Utils.arrayToString(indices));
}

---