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//=============================================================================
// Copyright 2006-2010 Daniel W. Dyer
//
// 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.uncommons.watchmaker.framework.termination;
import org.testng.annotations.Test;
import org.uncommons.watchmaker.framework.PopulationData;
import org.uncommons.watchmaker.framework.TerminationCondition;
/**
* Unit test for the {@link Stagnation} termination condition.
* @author Daniel Dyer
*/
public class StagnationTest
{
@Test
public void testFittestCandidateStagnation()
{
TerminationCondition stagnation = new Stagnation(2, true);
PopulationData<Object> data = new PopulationData<Object>(new Object(), 2, 1, 0.1, true, 10, 0, 0, 1);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 2 more generations.";
// Best doesn't improve even though mean does.
data = new PopulationData<Object>(new Object(), 1.8, 1.2, 0.1, true, 10, 0, 1, 2);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 1 more generation.";
// Best doesn't improve even though mean does.
data = new PopulationData<Object>(new Object(), 2, 1.5, 0.1, true, 10, 0, 2, 3);
assert stagnation.shouldTerminate(data) : "Stagnation should be triggered after 2 generations without improvement.";
}
@Test
public void testFittestCandidateStagnationNonNatural()
{
TerminationCondition stagnation = new Stagnation(2, false);
PopulationData<Object> data = new PopulationData<Object>(new Object(), 2, 1.5, 0.1, true, 10, 0, 0, 1);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 2 more generations.";
// Best doesn't improve even though mean does.
data = new PopulationData<Object>(new Object(), 2.2, 1.2, 0.1, true, 10, 0, 1, 2);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 1 more generation.";
// Best doesn't improve even though mean does.
data = new PopulationData<Object>(new Object(), 2, 1, 0.1, true, 10, 0, 2, 3);
assert stagnation.shouldTerminate(data) : "Stagnation should be triggered after 2 generations without improvement.";
}
@Test
public void testPopulationMeanStagnation()
{
TerminationCondition stagnation = new Stagnation(2, true, true);
PopulationData<Object> data = new PopulationData<Object>(new Object(), 2, 1, 0.1, true, 10, 0, 0, 1);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 2 more generations.";
// Best doesn't improve but mean does.
data = new PopulationData<Object>(new Object(), 2, 1.2, 0.1, true, 10, 0, 1, 2);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 2 more generations.";
// Best doesn't improve but mean does.
data = new PopulationData<Object>(new Object(), 2, 1.5, 0.1, true, 10, 0, 2, 3);
// Best has stagnated but mean hasn't so shouldn't terminate.
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 2 more generations.";
// Now we let the mean stagnate...and let the best candidate get fitter...
data = new PopulationData<Object>(new Object(), 2.1, 1.5, 0.1, true, 10, 0, 3, 4);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 1 more generation.";
data = new PopulationData<Object>(new Object(), 2.2, 1.5, 0.1, true, 10, 0, 4, 4);
assert stagnation.shouldTerminate(data) : "Stagnation should be triggered after 2 generations without improvement.";
}
@Test
public void testPopulationMeanStagnationNonNatural()
{
TerminationCondition stagnation = new Stagnation(2, false, true);
PopulationData<Object> data = new PopulationData<Object>(new Object(), 2, 1.5, 0.1, true, 10, 0, 0, 1);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 2 more generations.";
// Best doesn't improve but mean does.
data = new PopulationData<Object>(new Object(), 2, 1.2, 0.1, true, 10, 0, 1, 2);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 2 more generations.";
// Best doesn't improve but mean does.
data = new PopulationData<Object>(new Object(), 2, 1, 0.1, true, 10, 0, 2, 3);
// Best has stagnated but mean hasn't so shouldn't terminate.
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 2 more generations.";
// Now we let the mean stagnate...and let the best candidate get fitter...
data = new PopulationData<Object>(new Object(), 2.1, 1.6, 0.1, true, 10, 0, 3, 4);
assert !stagnation.shouldTerminate(data) : "Stagnation should not be triggered for at least 1 more generation.";
data = new PopulationData<Object>(new Object(), 2.2, 1.5, 0.1, true, 10, 0, 4, 4);
assert stagnation.shouldTerminate(data) : "Stagnation should be triggered after 2 generations without improvement.";
}
}
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