public static Chromosome <TGene, TFitness> GetBest(GetFitnessDelegate getFitness, int targetLen,
TFitness optimalFitness, IReadOnlyList <TGene> geneSet, DisplayDelegate display,
MutateGeneDelegate customMutate = null, CreateDelegate customCreate = null, int?maxAge = null)
{
Chromosome <TGene, TFitness> FnMutate(Chromosome <TGene, TFitness> parent) =>
customMutate == null
? Mutate(parent, geneSet, getFitness)
: MutateCustom(parent, customMutate, getFitness);
Chromosome <TGene, TFitness> FnGenerateParent()
{
if (customCreate == null)
{
return(GenerateParent(targetLen, geneSet, getFitness));
}
var genes = customCreate();
return(new Chromosome <TGene, TFitness>(genes, getFitness(genes)));
}
foreach (var improvement in GetImprovement(FnMutate, FnGenerateParent, maxAge))
{
display(improvement);
if (optimalFitness.CompareTo(improvement.Fitness) <= 0)
{
return(improvement);
}
}
throw new UnauthorizedAccessException();
}
private static Chromosome <TGene, TFitness> MutateCustom(Chromosome <TGene, TFitness> parent,
MutateGeneDelegate customMutate, GetFitnessDelegate getFitness)
{
var childGenes = parent.Genes.ToList();
customMutate(childGenes);
var fitness = getFitness(childGenes);
return(new Chromosome <TGene, TFitness>(childGenes, fitness));
}
public static Chromosome <TGene, TFitness> GetBest(GetFitnessDelegate getFitness, int targetLen,
TFitness optimalFitness, IReadOnlyList <TGene> geneSet, DisplayDelegate display,
MutateGeneDelegate customMutate = null, CreateDelegate customCreate = null, int?maxAge = null,
int poolSize = 1, CrossoverDelegate crossover = null, int?maxSeconds = null)
{
Chromosome <TGene, TFitness> FnMutate(Chromosome <TGene, TFitness> parent) =>
customMutate == null
? Mutate(parent, geneSet, getFitness)
: MutateCustom(parent, customMutate, getFitness);
Chromosome <TGene, TFitness> FnGenerateParent()
{
if (customCreate == null)
{
return(GenerateParent(targetLen, geneSet, getFitness));
}
var genes = customCreate();
return(new Chromosome <TGene, TFitness>(genes, getFitness(genes), Strategy.Create));
}
var strategyLookup =
new Dictionary <Strategy, StrategyDelegate>
{
{ Strategy.Create, (parentGenes, index, parents) => FnGenerateParent() },
{ Strategy.Mutate, (parentGenes, index, parents) => FnMutate(parentGenes) },
{
Strategy.Crossover, (parentGenes, index, parents) => Crossover(parentGenes.Genes, index,
parents, getFitness, crossover, FnMutate, FnGenerateParent)
}
};
var usedStrategies =
new List <StrategyDelegate> {
strategyLookup[Strategy.Mutate]
};
if (crossover != null)
{
usedStrategies.Add(strategyLookup[Strategy.Crossover]);
}
Chromosome <TGene, TFitness> FnNewChild(Chromosome <TGene, TFitness> parent, int index,
List <Chromosome <TGene, TFitness> > parents) =>
crossover != null
? Rand.SelectItem(usedStrategies)(parent, index, parents)
: FnMutate(parent);
try
{
foreach (var improvement in GetImprovement(FnNewChild, FnGenerateParent, maxAge, poolSize, maxSeconds))
{
display(improvement);
var f = strategyLookup[improvement.Strategy];
usedStrategies.Add(f);
if (optimalFitness.CompareTo(improvement.Fitness) <= 0)
{
return(improvement);
}
}
}
catch (SearchTimeoutException exception)
{
display(exception.Improvement);
return(exception.Improvement);
}
throw new UnauthorizedAccessException();
}