/**
 * 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.jmysvm.svm.SVMpattern;
import com.rapidminer.operator.learner.functions.kernel.jmysvm.svm.SVMregression;


/**
 * The implementation for the mySVM model (Java version) by Stefan Rueping.
 * 
 * @author Ingo Mierswa
 */
public class JMySVMModel extends AbstractMySVMModel {

	private static final long serialVersionUID = 7748169156351553025L;

	public JMySVMModel(ExampleSet exampleSet,
			com.rapidminer.operator.learner.functions.kernel.jmysvm.examples.SVMExamples model, Kernel kernel, int kernelType) {
		super(exampleSet, model, kernel, kernelType);
	}

	@Override
	public SVMInterface createSVM() {
		if (getLabel().isNominal()) {
			return new SVMpattern();
		} else {
			return new SVMregression();
		}
	}

	@Override
	public void setPrediction(Example example, double prediction) {
		Attribute predLabel = example.getAttributes().getPredictedLabel();
		if (predLabel.isNominal()) {
			int index = prediction > 0 ? predLabel.getMapping().getPositiveIndex() : predLabel.getMapping()
					.getNegativeIndex();
			example.setValue(predLabel, index);
			// set confidence to numerical prediction, such that can be scaled later
			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)));
		} else {
			example.setValue(predLabel, prediction);
		}
	}
}