/// <inheritdoc />
protected override void InitializeContinuousOptimizer(
Population basePopulation,
IncumbentGenomeWrapper <TResult> currentIncumbent)
{
if (basePopulation == null)
{
throw new ArgumentNullException(nameof(basePopulation));
}
if (currentIncumbent == null)
{
LoggingHelper.WriteLine(
VerbosityLevel.Warn,
"CMA-ES with focus on incumbent can only be executed if an incumbent exists, i.e. it is not possible to run it on its own.");
throw new ArgumentNullException(nameof(currentIncumbent));
}
// We do not reuse anything from potential old configurations, because old information may be
// outdated at the point a new phase is started.
var initialMean = PartialGenomeSearchPoint.CreateFromGenome(
currentIncumbent.IncumbentGenome,
this.ParameterTree,
this.StrategyConfiguration.MinimumDomainSize).Values;
var cmaEsConfiguration = new CmaEsConfiguration(
populationSize: basePopulation.CompetitiveCount,
initialDistributionMean: initialMean,
initialStepSize: this.StrategyConfiguration.InitialStepSize);
this._cmaEsRunner = this.CreateCmaEsRunner(evaluationBase: currentIncumbent.IncumbentGenome);
this._cmaEsRunner.Initialize(cmaEsConfiguration, this.CreateTerminationCriteria());
}
/// <summary>
/// Creates a new <see cref="CmaEs{TSearchPoint}"/> which evaluates points based on the provided
/// <see cref="Genome"/>.
/// </summary>
/// <param name="evaluationBase">The <see cref="Genome"/> determining discrete parameters.</param>
/// <returns>The newly created <see cref="CmaEs{TSearchPoint}"/>.</returns>
private CmaEs <PartialGenomeSearchPoint> CreateCmaEsRunner(Genome evaluationBase)
{
PartialGenomeSearchPoint.ObtainParameterBounds(
this.ParameterTree,
this.StrategyConfiguration.MinimumDomainSize,
out var lowerBounds,
out var upperBounds);
var converter = new GenomeSearchPointConverter(this.ParameterTree, this.StrategyConfiguration.MinimumDomainSize);
this._searchPointFactory = vector =>
new PartialGenomeSearchPoint(new ImmutableGenome(evaluationBase), vector, converter, this._genomeBuilder, lowerBounds, upperBounds);
return(new CmaEs <PartialGenomeSearchPoint>(this.SearchPointSorter, this._searchPointFactory));
}