/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.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.features.transformation;
import java.util.Iterator;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.Example;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.operator.InputDescription;
import com.rapidminer.operator.OperatorDescription;
import Jama.Matrix;
/**
* This class represents an abstract framework for performing dimensionality reduction using the JAMA package.
*
* @author Michael Wurst, Ingo Mierswa
* @version $Id: JamaDimensionalityReduction.java,v 1.5 2008/05/09 19:22:51 ingomierswa Exp $
*
*/
public abstract class JamaDimensionalityReduction extends DimensionalityReducer {
public JamaDimensionalityReduction(OperatorDescription description) {
super(description);
}
protected abstract Matrix callMatrixMethod(ExampleSet es, int dimension, Matrix in);
public InputDescription getInputDescription(Class cls) {
if (ExampleSet.class.isAssignableFrom(cls)) {
return new InputDescription(cls, false, true);
}
return super.getInputDescription(cls);
}
protected double[][] dimensionalityReduction(ExampleSet es, int dimensions) {
// encode matrix
Matrix in = new Matrix(es.size(), es.getAttributes().size());
Iterator<Example> er = es.iterator();
int count = 0;
while (er.hasNext()) {
Example e = er.next();
int i = 0;
for (Attribute attribute : e.getAttributes()) {
in.set(count, i++, e.getValue(attribute));
}
count++;
}
Matrix result = callMatrixMethod(es, dimensions, in);
// decode matrix
return result.getArray();
}
}