public void FinishPhaseKeepsIncumbentForMaximumReplacementRate()
{
// Create population along with an incumbent.
var basePopulation = this.CreatePopulation();
var incumbent = this.CreateIncumbentGenomeWrapper();
basePopulation.AddGenome(new Genome(incumbent.IncumbentGenome), isCompetitive: true);
// Create strategy with a replacement rate of 1.
var configuration = new AlgorithmTunerConfiguration.AlgorithmTunerConfigurationBuilder()
.SetMaximumNumberParallelEvaluations(1)
.AddDetailedConfigurationBuilder(
RegressionForestArgumentParser.Identifier,
new GenomePredictionRandomForestConfig.GenomePredictionRandomForestConfigBuilder())
.AddDetailedConfigurationBuilder(
CovarianceMatrixAdaptationStrategyArgumentParser.Identifier,
new CovarianceMatrixAdaptationStrategyConfiguration.CovarianceMatrixAdaptationStrategyConfigurationBuilder()
.SetFixInstances(this.FixInstances)
.SetReplacementRate(1)
.SetMaximumNumberGenerations(30));
this.Strategy = new LocalCovarianceMatrixAdaptationStrategy <TestInstance, IntegerResult>(
configuration.Build(),
this.ParameterTree,
this.GenomeBuilder,
this.GenomeSorter,
this.ResultStorageActor);
// Perform an iteration and finish the phase.
this.Strategy.Initialize(basePopulation, incumbent, this.SingleTestInstance);
this.Strategy.PerformIteration(0, this.SingleTestInstance);
this.Strategy.DumpStatus();
var updatedPopulation = this.Strategy.FinishPhase(basePopulation);
// Incumbent should still exist.
Assert.True(
updatedPopulation.GetCompetitiveIndividuals().Contains(incumbent.IncumbentGenome, new Genome.GeneValueComparator()),
"Updated population should contain incumbent, but does not.");
// Age structure should be correct.
for (int age = 0; age < 3; age++)
{
Assert.True(
basePopulation.GetCompetitiveIndividuals().Count(individual => individual.Age == age)
== updatedPopulation.GetCompetitiveIndividuals().Count(individual => individual.Age == age),
$"Different number of genomes with age {age}.");
}
Assert.False(
updatedPopulation.GetCompetitiveIndividuals().Any(individual => individual.Age < 0 || individual.Age > 3),
"There exists a genome with age not in age range!");
}
