Package org.encog.persist

Source Code of org.encog.persist.TestPersistPopulationNPE

/*
* Encog(tm) Core v3.3 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2014 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
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package org.encog.persist;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import junit.framework.Assert;
import junit.framework.TestCase;

import org.encog.ml.CalculateScore;
import org.encog.ml.data.basic.BasicMLDataSet;
import org.encog.ml.ea.population.Population;
import org.encog.ml.ea.train.EvolutionaryAlgorithm;
import org.encog.neural.neat.NEATPopulation;
import org.encog.neural.neat.NEATUtil;
import org.encog.neural.neat.PersistNEATPopulation;
import org.encog.neural.networks.training.TrainingSetScore;

public final class TestPersistPopulationNPE extends TestCase
{
  private static double FAKE_DATA[][] = { { 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 1.0, 1.0 } };

  public void testNPE() throws Exception
  {
    final CalculateScore score = new TrainingSetScore(new BasicMLDataSet(FAKE_DATA, FAKE_DATA));

    // create a new random population and train it
    NEATPopulation pop = new NEATPopulation(FAKE_DATA[0].length, 1, 50);
    pop.reset();
    EvolutionaryAlgorithm training1 = NEATUtil.constructNEATTrainer(pop, score);
    training1.iteration();
    // enough training for now, backup current population to continue later
    final ByteArrayOutputStream serialized1 = new ByteArrayOutputStream();
    new PersistNEATPopulation().save(serialized1, training1.getPopulation());

    // reload initial backup and continue training
    EvolutionaryAlgorithm training2 = NEATUtil.constructNEATTrainer(
      (NEATPopulation)new PersistNEATPopulation().read(new ByteArrayInputStream(serialized1.toByteArray())),
      score);
    training2.iteration();
    // enough training, backup the reloaded population to continue later
    final ByteArrayOutputStream serialized2 = new ByteArrayOutputStream();
    new PersistNEATPopulation().save(serialized2, training2.getPopulation());

    // NEATTraining.init() randomly fails with a NPE in NEATGenome.getCompatibilityScore()
    EvolutionaryAlgorithm training3 = NEATUtil.constructNEATTrainer(
      (NEATPopulation)new PersistNEATPopulation().read(new ByteArrayInputStream(serialized2.toByteArray())),
      score);
    training3.iteration();
    final ByteArrayOutputStream serialized3 = new ByteArrayOutputStream();
    new PersistNEATPopulation().save(serialized3, training3.getPopulation());
  }

  public void testSaveRead() throws Exception
  {
    final CalculateScore score = new TrainingSetScore(new BasicMLDataSet(FAKE_DATA, FAKE_DATA));
    NEATPopulation pop = new NEATPopulation(FAKE_DATA[0].length, 1, 50);
    pop.reset();
    // create a new random population and train it
    EvolutionaryAlgorithm training1 = NEATUtil.constructNEATTrainer(pop, score);
    training1.iteration();
    // enough training for now, backup current population
    final ByteArrayOutputStream serialized1 = new ByteArrayOutputStream();
    new PersistNEATPopulation().save(serialized1, training1.getPopulation());

    final Population population2 = (Population)new PersistNEATPopulation().read(new ByteArrayInputStream(
      serialized1.toByteArray()));
    final ByteArrayOutputStream serialized2 = new ByteArrayOutputStream();
    new PersistNEATPopulation().save(serialized2, population2);
    Assert.assertEquals(serialized1.size(), serialized2.size());   
  }
}
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