/**
* Copyright 2010 Neuroph Project http://neuroph.sourceforge.net
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.neuroph.core.learning;
import java.io.Serializable;
import java.util.Iterator;
import org.neuroph.core.NeuralNetwork;
/**
* Base class for all unsupervised learning algorithms.
*
* @author Zoran Sevarac <sevarac@gmail.com>
*/
abstract public class UnsupervisedLearning extends IterativeLearning implements
Serializable {
/**
* The class fingerprint that is set to indicate serialization
* compatibility with a previous version of the class
*/
private static final long serialVersionUID = 1L;
/**
* Creates new unsupervised learning rule
*/
public UnsupervisedLearning() {
super();
}
/**
* This method does one learning epoch for the unsupervised learning rules.
* It iterates through the training set and trains network weights for each
* element
*
* @param trainingSet
* training set for training network
*/
public void doLearningEpoch(TrainingSet trainingSet) {
Iterator<TrainingElement> iterator = trainingSet.iterator();
while (iterator.hasNext() && !isStopped()) {
TrainingElement trainingElement = iterator.next();
learnPattern(trainingElement);
}
}
/**
* Trains network with the pattern from the specified training element
*
* @param trainingElement
* unsupervised training element which contains network input
*/
protected void learnPattern(TrainingElement trainingElement) {
double[] input = trainingElement.getInput();
this.neuralNetwork.setInput(input);
this.neuralNetwork.calculate();
this.adjustWeights();
}
/**
* This method implements the weight adjustment
*/
abstract protected void adjustWeights();
}