/**
 * Copyright (C) 2001-2017 by RapidMiner and the contributors
 * 
 * Complete list of developers available at our web site:
 * 
 * http://rapidminer.com
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * 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
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program.
 * If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.learner.functions.kernel;

import com.rapidminer.example.Attribute;
import com.rapidminer.example.Example;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.operator.learner.functions.kernel.jmysvm.kernel.Kernel;
import com.rapidminer.operator.learner.functions.kernel.jmysvm.svm.SVMInterface;
import com.rapidminer.operator.learner.functions.kernel.logistic.KLR;


/**
 * The model for the MyKLR learner by Stefan Rueping.
 *
 * @author Ingo Mierswa
 */
public class MyKLRModel extends AbstractMySVMModel {

	private static final long serialVersionUID = 8033254475867697195L;

    /**
     * Instantiates a new My klr model.
     *
     * @param exampleSet the example set
     * @param model      the model
     * @param kernel     the kernel
     * @param kernelType the kernel type
     */
    public MyKLRModel(ExampleSet exampleSet,
			com.rapidminer.operator.learner.functions.kernel.jmysvm.examples.SVMExamples model, Kernel kernel, int kernelType) {
		super(exampleSet, model, kernel, kernelType);
	}

    /**
     * Gets model info.
     *
     * @return the model info
     */
    public String getModelInfo() {
		return "KLR Model (" + getNumberOfSupportVectors() + " support vectors)";
	}

	@Override
	public SVMInterface createSVM() {
		return new KLR();
	}

	@Override
	public void setPrediction(Example example, double _prediction) {
		double prediction = _prediction - 0.5d;
		Attribute predLabel = example.getAttributes().getPredictedLabel();
		int index = prediction > 0.0 ? predLabel.getMapping().getPositiveIndex() : predLabel.getMapping().getNegativeIndex();
		example.setValue(predLabel, index);
		example.setConfidence(predLabel.getMapping().getPositiveString(), 1.0d / (1.0d + java.lang.Math.exp(-prediction)));
		example.setConfidence(predLabel.getMapping().getNegativeString(), 1.0d / (1.0d + java.lang.Math.exp(prediction)));
	}
}
