/*
* RapidMiner
*
* Copyright (C) 2001-2011 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.preprocessing.normalization;
import java.util.HashMap;
import java.util.Iterator;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.AttributeRole;
import com.rapidminer.example.Attributes;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.example.SimpleAttributes;
import com.rapidminer.example.table.ViewAttribute;
import com.rapidminer.tools.Ontology;
import com.rapidminer.tools.container.Tupel;
/**
* This is the normalization model for the IQR normalization method.
*
* @author Brendon Bolin, Sebastian Land
*/
public class IQRNormalizationModel extends AbstractNormalizationModel {
private static final long serialVersionUID = 4333931155320624490L;
private HashMap<String, Tupel<Double, Double>> attributeMeanSigmaMap;
public IQRNormalizationModel(ExampleSet exampleSet, HashMap<String, Tupel<Double, Double>> attributeMeanSigmaMap) {
super(exampleSet);
this.attributeMeanSigmaMap = attributeMeanSigmaMap;
}
/**
* Returns a nicer name. Necessary since this model is defined as inner class.
*/
@Override
public String getName() {
return "IQR-Transformation";
}
public Attributes getTargetAttributes(ExampleSet viewParent) {
SimpleAttributes attributes = new SimpleAttributes();
// add special attributes to new attributes
Iterator<AttributeRole> roleIterator = viewParent.getAttributes().allAttributeRoles();
while (roleIterator.hasNext()) {
AttributeRole role = roleIterator.next();
if (role.isSpecial()) {
attributes.add(role);
}
}
// add regular attributes
for (Attribute attribute : viewParent.getAttributes()) {
if (!attribute.isNumerical() || !attributeMeanSigmaMap.containsKey(attribute.getName())) {
attributes.addRegular(attribute);
} else {
// giving new attributes old name: connection to rangesMap
attributes.addRegular(new ViewAttribute(this, attribute, attribute.getName(), Ontology.NUMERICAL, null));
}
}
return attributes;
}
public double getValue(Attribute targetAttribute, double value) {
Tupel<Double, Double> meanSigmaTupel = attributeMeanSigmaMap.get(targetAttribute.getName());
if (meanSigmaTupel != null)
if (meanSigmaTupel.getSecond().doubleValue() <= 0) {
return (0);
} else {
return ((value - meanSigmaTupel.getFirst().doubleValue()) / meanSigmaTupel.getSecond().doubleValue());
}
return value;
}
}