Example usage for weka.classifiers Evaluation numFalsePositives

Introduction

In this page you can find the example usage for weka.classifiers Evaluation numFalsePositives.

Prototype

public double numFalsePositives(int classIndex) 

Source Link

Document

Calculate number of false positives with respect to a particular class.

Usage

From source file:adams.flow.core.EvaluationHelper.java

License:Open Source License

/**
 * Returns a statistical value from the evaluation object.
 *
 * @param eval   the evaluation object to get the value from
 * @param statistic   the type of value to return
 * @param classIndex   the class label index, for statistics like AUC
 * @return      the determined value, Double.NaN if not found
 * @throws Exception   if evaluation fails
 *///from w w w  . j  av  a2s .c o  m
public static double getValue(Evaluation eval, EvaluationStatistic statistic, int classIndex) throws Exception {
    switch (statistic) {
    case NUMBER_CORRECT:
        return eval.correct();
    case NUMBER_INCORRECT:
        return eval.incorrect();
    case NUMBER_UNCLASSIFIED:
        return eval.unclassified();
    case PERCENT_CORRECT:
        return eval.pctCorrect();
    case PERCENT_INCORRECT:
        return eval.pctIncorrect();
    case PERCENT_UNCLASSIFIED:
        return eval.pctUnclassified();
    case KAPPA_STATISTIC:
        return eval.kappa();
    case MEAN_ABSOLUTE_ERROR:
        return eval.meanAbsoluteError();
    case ROOT_MEAN_SQUARED_ERROR:
        return eval.rootMeanSquaredError();
    case RELATIVE_ABSOLUTE_ERROR:
        return eval.relativeAbsoluteError();
    case ROOT_RELATIVE_SQUARED_ERROR:
        return eval.rootRelativeSquaredError();
    case CORRELATION_COEFFICIENT:
        return eval.correlationCoefficient();
    case SF_PRIOR_ENTROPY:
        return eval.SFPriorEntropy();
    case SF_SCHEME_ENTROPY:
        return eval.SFSchemeEntropy();
    case SF_ENTROPY_GAIN:
        return eval.SFEntropyGain();
    case SF_MEAN_PRIOR_ENTROPY:
        return eval.SFMeanPriorEntropy();
    case SF_MEAN_SCHEME_ENTROPY:
        return eval.SFMeanSchemeEntropy();
    case SF_MEAN_ENTROPY_GAIN:
        return eval.SFMeanEntropyGain();
    case KB_INFORMATION:
        return eval.KBInformation();
    case KB_MEAN_INFORMATION:
        return eval.KBMeanInformation();
    case KB_RELATIVE_INFORMATION:
        return eval.KBRelativeInformation();
    case TRUE_POSITIVE_RATE:
        return eval.truePositiveRate(classIndex);
    case NUM_TRUE_POSITIVES:
        return eval.numTruePositives(classIndex);
    case FALSE_POSITIVE_RATE:
        return eval.falsePositiveRate(classIndex);
    case NUM_FALSE_POSITIVES:
        return eval.numFalsePositives(classIndex);
    case TRUE_NEGATIVE_RATE:
        return eval.trueNegativeRate(classIndex);
    case NUM_TRUE_NEGATIVES:
        return eval.numTrueNegatives(classIndex);
    case FALSE_NEGATIVE_RATE:
        return eval.falseNegativeRate(classIndex);
    case NUM_FALSE_NEGATIVES:
        return eval.numFalseNegatives(classIndex);
    case IR_PRECISION:
        return eval.precision(classIndex);
    case IR_RECALL:
        return eval.recall(classIndex);
    case F_MEASURE:
        return eval.fMeasure(classIndex);
    case MATTHEWS_CORRELATION_COEFFICIENT:
        return eval.matthewsCorrelationCoefficient(classIndex);
    case AREA_UNDER_ROC:
        return eval.areaUnderROC(classIndex);
    case AREA_UNDER_PRC:
        return eval.areaUnderPRC(classIndex);
    case WEIGHTED_TRUE_POSITIVE_RATE:
        return eval.weightedTruePositiveRate();
    case WEIGHTED_FALSE_POSITIVE_RATE:
        return eval.weightedFalsePositiveRate();
    case WEIGHTED_TRUE_NEGATIVE_RATE:
        return eval.weightedTrueNegativeRate();
    case WEIGHTED_FALSE_NEGATIVE_RATE:
        return eval.weightedFalseNegativeRate();
    case WEIGHTED_IR_PRECISION:
        return eval.weightedPrecision();
    case WEIGHTED_IR_RECALL:
        return eval.weightedRecall();
    case WEIGHTED_F_MEASURE:
        return eval.weightedFMeasure();
    case WEIGHTED_MATTHEWS_CORRELATION_COEFFICIENT:
        return eval.weightedMatthewsCorrelation();
    case WEIGHTED_AREA_UNDER_ROC:
        return eval.weightedAreaUnderROC();
    case WEIGHTED_AREA_UNDER_PRC:
        return eval.weightedAreaUnderPRC();
    case UNWEIGHTED_MACRO_F_MEASURE:
        return eval.unweightedMacroFmeasure();
    case UNWEIGHTED_MICRO_F_MEASURE:
        return eval.unweightedMicroFmeasure();
    case BIAS:
        return eval.getPluginMetric(Bias.class.getName()).getStatistic(Bias.NAME);
    case RSQUARED:
        return eval.getPluginMetric(RSquared.class.getName()).getStatistic(RSquared.NAME);
    case SDR:
        return eval.getPluginMetric(SDR.class.getName()).getStatistic(SDR.NAME);
    case RPD:
        return eval.getPluginMetric(RPD.class.getName()).getStatistic(RPD.NAME);
    default:
        throw new IllegalArgumentException("Unhandled statistic field: " + statistic);
    }
}

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From source file:entity.NfoldCrossValidationManager.java

License:Open Source License

/**
 * n fold cross validation without noise
 * //from ww w.j a  v  a 2  s. co  m
 * @param classifier
 * @param dataset
 * @param folds
 * @return
 */
public Stats crossValidate(Classifier classifier, Instances dataset, int folds) {

    // randomizes order of instances
    Instances randDataset = new Instances(dataset);
    randDataset.randomize(RandomizationManager.randomGenerator);

    // cross-validation
    Evaluation eval = null;
    try {
        eval = new Evaluation(randDataset);
    } catch (Exception e) {
        e.printStackTrace();
    }
    for (int n = 0; n < folds; n++) {
        Instances test = randDataset.testCV(folds, n);
        Instances train = randDataset.trainCV(folds, n, RandomizationManager.randomGenerator);

        // build and evaluate classifier
        Classifier clsCopy;
        try {
            clsCopy = Classifier.makeCopy(classifier);
            clsCopy.buildClassifier(train);
            eval.evaluateModel(clsCopy, test);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    // output evaluation for the nfold cross validation
    Double precision = eval.precision(Settings.classificationChoice);
    Double recall = eval.recall(Settings.classificationChoice);
    Double fmeasure = eval.fMeasure(Settings.classificationChoice);
    Double classificationTP = eval.numTruePositives(Settings.classificationChoice);
    Double classificationTN = eval.numTrueNegatives(Settings.classificationChoice);
    Double classificationFP = eval.numFalsePositives(Settings.classificationChoice);
    Double classificationFN = eval.numFalseNegatives(Settings.classificationChoice);
    Double kappa = eval.kappa();

    return new Stats(classificationTP, classificationTN, classificationFP, classificationFN, kappa, precision,
            recall, fmeasure);
}

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From source file:entity.NfoldCrossValidationManager.java

License:Open Source License

/**
 * n fold cross validation with noise (independent fp and fn)
 * /*ww w . j a v  a 2s . co  m*/
 * @param classifier
 * @param dataset
 * @param folds
 * @return
 */
public Stats crossValidateWithNoise(Classifier classifier, Instances dataset, int folds,
        BigDecimal fpPercentage, BigDecimal fnPercentage) {

    // noise manager
    NoiseInjectionManager noiseInjectionManager = new NoiseInjectionManager();

    // randomizes order of instances
    Instances randDataset = new Instances(dataset);
    randDataset.randomize(RandomizationManager.randomGenerator);

    // cross-validation
    Evaluation eval = null;
    try {
        eval = new Evaluation(randDataset);
    } catch (Exception e) {
        e.printStackTrace();
    }
    for (int n = 0; n < folds; n++) {
        Instances test = randDataset.testCV(folds, n);
        Instances train = randDataset.trainCV(folds, n, RandomizationManager.randomGenerator);

        // copies instances of train set to not modify the original
        Instances noisyTrain = new Instances(train);
        // injects level of noise in the copied train set
        noiseInjectionManager.addNoiseToDataset(noisyTrain, fpPercentage, fnPercentage);

        // build and evaluate classifier
        Classifier clsCopy;
        try {
            clsCopy = Classifier.makeCopy(classifier);
            // trains the model using a noisy train set
            clsCopy.buildClassifier(noisyTrain);
            eval.evaluateModel(clsCopy, test);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    // output evaluation for the nfold cross validation
    Double precision = eval.precision(Settings.classificationChoice);
    Double recall = eval.recall(Settings.classificationChoice);
    Double fmeasure = eval.fMeasure(Settings.classificationChoice);
    Double classificationTP = eval.numTruePositives(Settings.classificationChoice);
    Double classificationTN = eval.numTrueNegatives(Settings.classificationChoice);
    Double classificationFP = eval.numFalsePositives(Settings.classificationChoice);
    Double classificationFN = eval.numFalseNegatives(Settings.classificationChoice);
    Double kappa = eval.kappa();

    return new Stats(classificationTP, classificationTN, classificationFP, classificationFN, kappa, precision,
            recall, fmeasure);
}

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From source file:entity.NfoldCrossValidationManager.java

License:Open Source License

/**
 * n fold cross validation with noise (combined fp and fn)
 * //w  ww.  ja v a2 s  . co  m
 * @param classifier
 * @param dataset
 * @param folds
 * @return
 */

public Stats crossValidateWithNoise(Classifier classifier, Instances dataset, int folds,
        BigDecimal combinedFpFnPercentage) {

    // noise manager
    NoiseInjectionManager noiseInjectionManager = new NoiseInjectionManager();

    // randomizes order of instances
    Instances randDataset = new Instances(dataset);
    randDataset.randomize(RandomizationManager.randomGenerator);

    // cross-validation
    Evaluation eval = null;
    try {
        eval = new Evaluation(randDataset);
    } catch (Exception e) {
        e.printStackTrace();
    }
    for (int n = 0; n < folds; n++) {
        Instances test = randDataset.testCV(folds, n);
        Instances train = randDataset.trainCV(folds, n, RandomizationManager.randomGenerator);

        // copies instances of train set to not modify the original
        Instances noisyTrain = new Instances(train);
        // injects level of noise in the copied train set
        noiseInjectionManager.addNoiseToDataset(noisyTrain, combinedFpFnPercentage);

        // build and evaluate classifier
        Classifier clsCopy;
        try {
            clsCopy = Classifier.makeCopy(classifier);
            // trains the model using a noisy train set
            clsCopy.buildClassifier(noisyTrain);
            eval.evaluateModel(clsCopy, test);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    // output evaluation for the nfold cross validation
    Double precision = eval.precision(Settings.classificationChoice);
    Double recall = eval.recall(Settings.classificationChoice);
    Double fmeasure = eval.fMeasure(Settings.classificationChoice);
    Double classificationTP = eval.numTruePositives(Settings.classificationChoice);
    Double classificationTN = eval.numTrueNegatives(Settings.classificationChoice);
    Double classificationFP = eval.numFalsePositives(Settings.classificationChoice);
    Double classificationFN = eval.numFalseNegatives(Settings.classificationChoice);
    Double kappa = eval.kappa();

    return new Stats(classificationTP, classificationTN, classificationFP, classificationFN, kappa, precision,
            recall, fmeasure);
}

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From source file:it.unisa.gitdm.evaluation.WekaEvaluator.java

private static void evaluateModel(String baseFolderPath, String projectName, Classifier pClassifier,
        Instances pInstances, String pModelName, String pClassifierName) throws Exception {

    // other options
    int folds = 10;

    // randomize data
    Random rand = new Random(42);
    Instances randData = new Instances(pInstances);
    randData.randomize(rand);//from  ww  w. j av  a 2s  . c om
    if (randData.classAttribute().isNominal()) {
        randData.stratify(folds);
    }

    // perform cross-validation and add predictions
    Instances predictedData = null;
    Evaluation eval = new Evaluation(randData);

    int positiveValueIndexOfClassFeature = 0;
    for (int n = 0; n < folds; n++) {
        Instances train = randData.trainCV(folds, n);
        Instances test = randData.testCV(folds, n);
        // the above code is used by the StratifiedRemoveFolds filter, the
        // code below by the Explorer/Experimenter:
        // Instances train = randData.trainCV(folds, n, rand);

        int classFeatureIndex = 0;
        for (int i = 0; i < train.numAttributes(); i++) {
            if (train.attribute(i).name().equals("isBuggy")) {
                classFeatureIndex = i;
                break;
            }
        }

        Attribute classFeature = train.attribute(classFeatureIndex);
        for (int i = 0; i < classFeature.numValues(); i++) {
            if (classFeature.value(i).equals("TRUE")) {
                positiveValueIndexOfClassFeature = i;
            }
        }

        train.setClassIndex(classFeatureIndex);
        test.setClassIndex(classFeatureIndex);

        // build and evaluate classifier
        pClassifier.buildClassifier(train);
        eval.evaluateModel(pClassifier, test);

        // add predictions
        //           AddClassification filter = new AddClassification();
        //           filter.setClassifier(pClassifier);
        //           filter.setOutputClassification(true);
        //           filter.setOutputDistribution(true);
        //           filter.setOutputErrorFlag(true);
        //           filter.setInputFormat(train);
        //           Filter.useFilter(train, filter); 
        //           Instances pred = Filter.useFilter(test, filter); 
        //           if (predictedData == null)
        //             predictedData = new Instances(pred, 0);
        //           
        //           for (int j = 0; j < pred.numInstances(); j++)
        //             predictedData.add(pred.instance(j));
    }
    double accuracy = (eval.numTruePositives(positiveValueIndexOfClassFeature)
            + eval.numTrueNegatives(positiveValueIndexOfClassFeature))
            / (eval.numTruePositives(positiveValueIndexOfClassFeature)
                    + eval.numFalsePositives(positiveValueIndexOfClassFeature)
                    + eval.numFalseNegatives(positiveValueIndexOfClassFeature)
                    + eval.numTrueNegatives(positiveValueIndexOfClassFeature));

    double fmeasure = 2 * ((eval.precision(positiveValueIndexOfClassFeature)
            * eval.recall(positiveValueIndexOfClassFeature))
            / (eval.precision(positiveValueIndexOfClassFeature)
                    + eval.recall(positiveValueIndexOfClassFeature)));
    File wekaOutput = new File(baseFolderPath + projectName + "/predictors.csv");
    PrintWriter pw1 = new PrintWriter(wekaOutput);

    pw1.write(accuracy + ";" + eval.precision(positiveValueIndexOfClassFeature) + ";"
            + eval.recall(positiveValueIndexOfClassFeature) + ";" + fmeasure + ";"
            + eval.areaUnderROC(positiveValueIndexOfClassFeature));

    System.out.println(projectName + ";" + pClassifierName + ";" + pModelName + ";"
            + eval.numTruePositives(positiveValueIndexOfClassFeature) + ";"
            + eval.numFalsePositives(positiveValueIndexOfClassFeature) + ";"
            + eval.numFalseNegatives(positiveValueIndexOfClassFeature) + ";"
            + eval.numTrueNegatives(positiveValueIndexOfClassFeature) + ";" + accuracy + ";"
            + eval.precision(positiveValueIndexOfClassFeature) + ";"
            + eval.recall(positiveValueIndexOfClassFeature) + ";" + fmeasure + ";"
            + eval.areaUnderROC(positiveValueIndexOfClassFeature) + "\n");
}

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From source file:meddle.TrainModelByDomainOS.java

License:Open Source License

/**
 * Do evalution on trained classifier/model, including the summary, false
 * positive/negative rate, AUC, running time
 *
 * @param j48/*w w w  . java2 s  .  c  o  m*/
 *            - the trained classifier
 * @param domain
 *            - the domain name
 */
public static MetaEvaluationMeasures doEvaluation(Classifier classifier, String domainOS, Instances tras,
        MetaEvaluationMeasures mem) {
    try {
        Evaluation evaluation = new Evaluation(tras);
        evaluation.crossValidateModel(classifier, tras, 10, new Random(1));
        mem.numInstance = evaluation.numInstances();
        double M = evaluation.numTruePositives(1) + evaluation.numFalseNegatives(1);
        mem.numPositive = (int) M;
        mem.AUC = evaluation.areaUnderROC(1);
        mem.numCorrectlyClassified = (int) evaluation.correct();
        mem.accuracy = 1.0 * mem.numCorrectlyClassified / mem.numInstance;
        mem.falseNegativeRate = evaluation.falseNegativeRate(1);
        mem.falsePositiveRate = evaluation.falsePositiveRate(1);
        mem.fMeasure = evaluation.fMeasure(1);
        double[][] cmMatrix = evaluation.confusionMatrix();
        mem.confusionMatrix = cmMatrix;
        mem.TP = evaluation.numTruePositives(1);
        mem.TN = evaluation.numTrueNegatives(1);
        mem.FP = evaluation.numFalsePositives(1);
        mem.FN = evaluation.numFalseNegatives(1);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return mem;
}

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