/*
* 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.generator;
import java.util.HashSet;
import java.util.Set;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.Attributes;
import com.rapidminer.example.table.AttributeFactory;
import com.rapidminer.operator.ports.metadata.AttributeMetaData;
import com.rapidminer.operator.ports.metadata.ExampleSetMetaData;
import com.rapidminer.operator.ports.metadata.SetRelation;
import com.rapidminer.tools.Ontology;
import com.rapidminer.tools.math.container.Range;
/**
* The label is the first class, if the sum of all arguments modulo 2 is 0,
* it is the second class if the sum modulo 3 is 0 and the third class if
* the sum modulo 5 is 0. In all other cases the label is the fourth class.
*
* @author Ingo Mierswa
*/
public class MultiClassificationFunction extends ClassificationFunction {
Attribute nominalLabel = AttributeFactory.createAttribute("label", Ontology.NOMINAL);
public MultiClassificationFunction() {
getLabel().getMapping().mapString("one");
getLabel().getMapping().mapString("two");
getLabel().getMapping().mapString("three");
getLabel().getMapping().mapString("four");
}
@Override
public Attribute getLabel() {
return nominalLabel;
}
public double calculate(double[] args) throws FunctionException {
double sumD = 0.0d;
for (int i = 0; i < args.length; i++)
sumD += args[i];
int sum = Math.abs((int) Math.round(sumD));
if ((sum % 2) == 0)
return getLabel().getMapping().mapString("one");
else if ((sum % 3) == 0)
return getLabel().getMapping().mapString("two");
else if ((sum % 5) == 0)
return getLabel().getMapping().mapString("three");
else
return getLabel().getMapping().mapString("four");
}
@Override
public ExampleSetMetaData getGeneratedMetaData() {
ExampleSetMetaData emd = new ExampleSetMetaData();
// label
AttributeMetaData amd = new AttributeMetaData("label", Ontology.NOMINAL, Attributes.LABEL_NAME);
Set<String> valueSet = new HashSet<String>();
valueSet.add("one");
valueSet.add("two");
valueSet.add("three");
valueSet.add("four");
amd.setValueSet(valueSet, SetRelation.EQUAL);
emd.addAttribute(amd);
// attributes
for (int i = 0; i < getTotalNumberOfAttributes(); i++) {
amd = new AttributeMetaData("att" + (i + 1), Ontology.REAL);
amd.setValueRange(new Range(lower, upper), SetRelation.EQUAL);
emd.addAttribute(amd);
}
emd.setNumberOfExamples(getTotalNumberOfExamples());
return emd;
}
}