/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* MacroFMeasure.java
* Copyright (C) 2009-2011 Aristotle University of Thessaloniki, Greece
*/
package mulan.evaluation.measure;
import mulan.core.MulanRuntimeException;
/**
* Implementation of the macro-averaged f measure.
*
* @author Grigorios Tsoumakas
* @version 2010.12.31
*/
public class MacroFMeasure extends LabelBasedFMeasure {
private boolean strict;
/**
* Constructs a new object with given number of labels and strictness
*
* @param numOfLabels the number of labels
* @param isStrict when false, divisions-by-zero are ignored
*/
public MacroFMeasure(int numOfLabels, boolean isStrict) {
super(numOfLabels);
strict = isStrict;
}
/**
* Full constructor
*
* @param numOfLabels the number of labels
* @param isStrict when false, divisions-by-zero are ignored
* @param beta controls the combination of precision and recall
*/
public MacroFMeasure(int numOfLabels, boolean isStrict, double beta) {
super(numOfLabels, beta);
strict = isStrict;
}
public String getName() {
return "Macro-averaged F-Measure";
}
public double getValue() {
double sum = 0;
int count = 0;
for (int labelIndex = 0; labelIndex < numOfLabels; labelIndex++) {
if (strict) {
sum += FMeasure.compute(truePositives[labelIndex],
falsePositives[labelIndex],
falseNegatives[labelIndex], beta);
count++;
} else {
try {
sum += FMeasure.compute(truePositives[labelIndex],
falsePositives[labelIndex],
falseNegatives[labelIndex], beta);
count++;
} catch (MulanRuntimeException e) {
continue;
}
}
}
return sum / count;
}
}