/**
* 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.generator;
import com.rapidminer.example.Attribute;
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.RandomGenerator;
import com.rapidminer.tools.math.container.Range;
/**
* Generates an Association function transaction dataset. The first four attributes are correlated.
*
* @author Ingo Mierswa
*/
public class TransactionDatasetFunction implements TargetFunction {
private int numberOfExamples;
private int numberOfAttributes;
/** Does nothing. */
@Override
public void init(RandomGenerator random) {}
@Override
public void setTotalNumberOfExamples(int number) {
this.numberOfExamples = number;
}
@Override
public void setTotalNumberOfAttributes(int number) {
this.numberOfAttributes = number;
}
@Override
public void setLowerArgumentBound(double lower) {}
@Override
public void setUpperArgumentBound(double upper) {}
@Override
public Attribute getLabel() {
return null;
}
@Override
public double calculate(double[] att) throws FunctionException {
if (att.length < 5) {
throw new FunctionException("Transaction dataset function", "needs at least 5 attributes!");
}
return Double.NaN;
}
@Override
public double[] createArguments(int number, RandomGenerator random) throws FunctionException {
if (number < 5) {
throw new FunctionException("Transaction dataset function", "needs at least 5 attributes!");
}
double[] args = new double[number];
for (int i = 0; i < args.length; i++) {
args[i] = random.nextDouble() < 0.1 ? 1 : 0;
}
if ((args[1] == 1) && (random.nextDouble() < 0.8)) {
args[3] = 1;
}
if ((args[0] == 1) && (random.nextDouble() < 0.9)) {
args[1] = 1;
}
if ((args[0] == 1) && (random.nextDouble() < 0.7)) {
args[2] = 1;
}
return args;
}
@Override
public ExampleSetMetaData getGeneratedMetaData() {
ExampleSetMetaData emd = new ExampleSetMetaData();
for (int i = 1; i <= numberOfAttributes; i++) {
AttributeMetaData amd = new AttributeMetaData("att" + i, Ontology.REAL);
amd.setValueRange(new Range(0, 1d), SetRelation.EQUAL);
emd.addAttribute(amd);
}
emd.setNumberOfExamples(numberOfExamples);
return emd;
}
@Override
public int getMinNumberOfAttributes() {
return 5;
}
@Override
public int getMaxNumberOfAttributes() {
return Integer.MAX_VALUE;
}
}