/*
* Encog(tm) Core v3.4 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2016 Heaton Research, Inc.
*
* 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.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.ml.prg.train;
import java.io.Serializable;
import org.encog.ml.CalculateScore;
import org.encog.ml.MLMethod;
import org.encog.ml.data.MLData;
import org.encog.ml.data.basic.BasicMLData;
import org.encog.ml.prg.EncogProgram;
/**
* This is a very simple evaluation function that simply passes in all zeros for
* the input arguments. Make sure that the genome you are testing supports
* floating point numbers for inputs.
*
* This evaluation function is useful to test to very quickly verify that a
* genome is valid and does not generate any obvious division by zero issues.
* This allows a population generator to quickly eliminate some invalid genomes.
*/
public class ZeroEvalScoreFunction implements CalculateScore, Serializable {
/**
* The serial id.
*/
private static final long serialVersionUID = 1L;
/**
* {@inheritDoc}
*/
@Override
public double calculateScore(final MLMethod genome) {
final EncogProgram prg = (EncogProgram) genome;
final PrgPopulation pop = (PrgPopulation) prg.getPopulation();
final MLData inputData = new BasicMLData(pop.getContext()
.getDefinedVariables().size());
prg.compute(inputData);
return 0;
}
/**
* {@inheritDoc}
*/
@Override
public boolean requireSingleThreaded() {
return false;
}
/**
* {@inheritDoc}
*/
@Override
public boolean shouldMinimize() {
return true;
}
}