public override IChromosome Clone()
{
var scheduleChromosome = new ScheduleChromosome(this.JobShop, false)
{
ScheduleLength = this.ScheduleLength,
Graph = this.Graph,
Fitness = this.Fitness,
};
var clonedGenes = GetGenes().Select(x => x.Value)
.Cast <MachineChromosome>().Select(x => x.Clone())
.Select(x => new Gene(x)).ToArray();
scheduleChromosome.ReplaceGenes(0, clonedGenes);
return(scheduleChromosome);
}
private void PerformMutate(ScheduleChromosome chromosome, float probability)
{
if (RandomizationProvider.Current.GetDouble() <= probability)
{
// perform mutation by machines
foreach (var gene in chromosome.GetGenes())
{
if (RandomizationProvider.Current.GetDouble() <= machineMutationProbability)
{
// perform swap (maybe more times)
machineMutation.Mutate((MachineChromosome)gene.Value, 1);
chromosome.ScheduleLength = null;
chromosome.Fitness = null;
}
}
}
}
private double Evaluate(ScheduleChromosome chromosome)
{
if (chromosome.Fitness != null)
{
return(chromosome.Fitness.Value);
}
// create graph
chromosome.FixChromosome();
var graph = chromosome.Graph;
double scheduleLength = new GraphHandler().GetMaximumCost(graph, chromosome.TopologicalOrder);
chromosome.ScheduleLength = scheduleLength;
chromosome.Fitness = 1 / (scheduleLength + 1);
return(chromosome.Fitness.Value);
}
