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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* ZeroOneLossFunction.java
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* Copyright (C) 2004 Stijn Lievens
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package weka.classifiers.misc.monotone;
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* Class implementing the zero-one loss function, this is
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* an incorrect prediction always accounts for one unit loss.
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* This implementation is done as part of the master's thesis: "Studie
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* en implementatie van instantie-gebaseerde algoritmen voor gesuperviseerd
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* rangschikken", Stijn Lievens, Ghent University, 2004.
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* @author Stijn Lievens (stijn.lievens@ugent.be)
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* @version $Revision: 1.1 $
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public class ZeroOneLossFunction
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implements NominalLossFunction {
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* Returns the zero-one loss function between two class values.
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* @param actual the actual class value
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* @param predicted the predicted class value
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* @return 1 if the actual and predicted value differ, 0 otherwise
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public final double loss(double actual, double predicted) {
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return actual == predicted ? 0 : 1;
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* Returns a string with the name of the loss function.
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* @return a string with the name of the loss function
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public String toString() {
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return "ZeroOneLossFunction";