Example usage for weka.attributeSelection CfsSubsetEval evaluateSubset

Introduction

In this page you can find the example usage for weka.attributeSelection CfsSubsetEval evaluateSubset.

Prototype

@Override
public double evaluateSubset(BitSet subset) throws Exception 

Source Link

Document

evaluates a subset of attributes

Usage

From source file:com.rapidminer.operator.validation.CFSFeatureSetEvaluator.java

License:Open Source License

public IOObject[] apply() throws OperatorException {
    ExampleSet exampleSet = getInput(ExampleSet.class);
    Instances instances = WekaTools.toWekaInstances(exampleSet, "TempInstances", WekaInstancesAdaptor.LEARNING);
    double performance = 0.0d;
    try {/*  w  w w.j  a  v  a  2  s  .  c  o m*/
        CfsSubsetEval evaluator = new CfsSubsetEval();
        evaluator.buildEvaluator(instances);
        BitSet bitSet = new BitSet(exampleSet.getAttributes().size());
        bitSet.flip(0, exampleSet.getAttributes().size());
        performance = evaluator.evaluateSubset(bitSet);
    } catch (Exception e) {
        throw new UserError(this, e, 905, new Object[] { "CfsSubsetEval", e.getMessage() });
    }
    PerformanceVector result = new PerformanceVector();
    result.addCriterion(new EstimatedPerformance("CorrelationFS", performance, 1, false));
    return new IOObject[] { result };
}

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From source file:sirius.misc.featurevisualizer.FeatureVisualizerPane.java

License:Open Source License

private void setTop2CFSIndex() {
    if (top1CFSIndex != -1)
        return;//from w  w w .j  a v a 2s .  c o  m
    Thread runThread = new Thread() {
        public void run() {
            try {
                CfsSubsetEval myCfs = new CfsSubsetEval();
                myCfs.buildEvaluator(instances);
                double maxCFSScore = -9999999;
                int divisor = instances.numAttributes() / 100;
                BitSet bs = new BitSet();
                //-1 because assume that last attribute is class attribute
                for (int x = 0; x < instances.numAttributes() - 1; x++) {
                    if (divisor != 0 && x % divisor == 0)
                        statusTextField.setText(
                                "Calculating Top CFS.. " + ((x * 100) / instances.numAttributes()) + "%");
                    bs.set(x, true);
                    //-1 because assume that last attribute is class attribute
                    for (int y = (x + 1); y < instances.numAttributes() - 1; y++) {
                        bs.set(y, true);
                        if (myCfs.evaluateSubset(bs) > maxCFSScore) {
                            maxCFSScore = myCfs.evaluateSubset(bs);
                            top1CFSIndex = x;
                            top2CFSIndex = y;
                        }
                        bs.set(y, false);
                    }
                    bs.set(x, false);
                }
                statusTextField.setText("Done");
                setTop2CFS();
            } catch (Exception e) {
                JOptionPane.showMessageDialog(null, e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
                e.printStackTrace();
            }
        }
    };
    runThread.setPriority(Thread.MIN_PRIORITY);
    runThread.start();
}

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