public ISolution Solve()
{
var totalElapsedEpochs = 0;
ISolution bestSolutionSoFar = null;
double bestFitnessSoFar = 0;
int overallEvaluatedSolutions = 0;
var sw = new Stopwatch();
sw.Start();
do
{
var theWorld = new TheWorld(this.problem, this.environmentConfig.PopulationSize);
var bestSolution = theWorld.EvolveUntil((epochs, epochsWithoutFitnessImprovement, bestFitness, averageFitness) =>
{
if (bestFitness > bestFitnessSoFar)
{
bestFitnessSoFar = bestFitness;
if (logFitnessImprovement)
{
log.DebugFormat("Fitness improvement! Epoch {0}. Best fitness: {1} - average {2} - Fitness stable from epochs: {3}",
epochs,
bestFitness,
averageFitness,
epochsWithoutFitnessImprovement);
}
OnFitnessImprovement?.Invoke(bestFitness, averageFitness);
}
totalElapsedEpochs++;
return(computationTerminationManager.Terminated((int)sw.ElapsedMilliseconds, totalElapsedEpochs, epochsWithoutFitnessImprovement));
});
overallEvaluatedSolutions += bestSolution.EvaluatedSolutions;
if ((bestSolutionSoFar == null) || (bestSolutionSoFar.Fitness < bestSolution.Fitness))
{
bestSolutionSoFar = bestSolution;
}
} while (!computationTerminationManager.Terminated((int)sw.ElapsedMilliseconds, totalElapsedEpochs));
return(new Solution(this.problem.Items)
{
Fitness = bestSolutionSoFar.Fitness,
Allocations = bestSolutionSoFar.Allocations,
EvaluatedSolutions = overallEvaluatedSolutions
});
}
private void SolvingEnvironment_OnFitnessImprovement(double bestFitness, double averageFitness)
{
OnFitnessImprovement?.Invoke(bestFitness, averageFitness);
}