protected override void Run(CancellationToken token)
{
var items = Problem.Items;
var bin = Problem.BinShape;
var sorting = new[] { SortingMethodParameter.Value.Value };
if (sorting[0] == SortingMethod.All)
{
sorting = Enum.GetValues(typeof(SortingMethod)).Cast <SortingMethod>().Where(x => x != SortingMethod.All).ToArray();
}
var fitting = new[] { fittingMethodParameter.Value.Value };
if (fitting[0] == FittingMethod.All)
{
fitting = Enum.GetValues(typeof(FittingMethod)).Cast <FittingMethod>().Where(x => x != FittingMethod.All).ToArray();
}
var result = GetBest(bin, items, sorting, fitting, token);
if (result == null)
{
throw new InvalidOperationException("No result obtained!");
}
Results.Add(new Result("Best Solution",
"The best found solution",
result.Item1));
Results.Add(new Result("Best Solution Quality",
"The quality of the best found solution according to the evaluator",
new DoubleValue(result.Item2)));
var binUtil = new BinUtilizationEvaluator();
var packRatio = new PackingRatioEvaluator();
Results.Add(new Result("Best Solution Bin Count",
"The number of bins in the best found solution",
new IntValue(result.Item1.NrOfBins)));
Results.Add(new Result("Best Solution Bin Utilization",
"The utilization given in percentage as calculated by the BinUtilizationEvaluator (total used space / total available space)",
new PercentValue(Math.Round(binUtil.Evaluate(result.Item1), 3))));
if (result.Item3.HasValue && sorting.Length > 1)
{
Results.Add(new Result("Best Sorting Method",
"The sorting method that found the best solution",
new EnumValue <SortingMethod>(result.Item3.Value)));
}
if (result.Item4.HasValue && fitting.Length > 1)
{
Results.Add(new Result("Best Fitting Method",
"The fitting method that found the best solution",
new EnumValue <FittingMethod>(result.Item4.Value)));
}
}
protected ProblemBase()
: base()
{
var defaultEvaluator = new PackingRatioEvaluator();
Parameters.Add(new ValueParameter <IDecoder <TSol> >("Decoder", "The decoder translates a permutation to a packing solution candidiates"));
Parameters.Add(new ValueParameter <IEvaluator>(SolutionEvaluatorParameterName, "The evaluator calculates qualities of solution candidates", defaultEvaluator));
Parameters.Add(new FixedValueParameter <BoolValue>(UseStackingConstraintsParameterName, "A flag that determines if stacking constraints are considered when solving the problem.", new BoolValue(false)));
Parameters.Add(new ValueParameter <ReadOnlyItemList <PackingItem> >("Items", "The items which must be packed into bins"));
Parameters.Add(new ValueParameter <PackingShape>("BinShape", "The size of bins into which items must be packed"));
Parameters.Add(new OptionalValueParameter <Solution>("BestKnownSolution", "The best solution found so far"));
Parameters.Add(new FixedValueParameter <IntValue>("LowerBound", "A lower bound for the number of bins that is necessary to pack all items"));
Load(defaultInstance);
}
protected PackingRatioEvaluator(PackingRatioEvaluator original, Cloner cloner)
: base(original, cloner)
{
}
protected PackingRatioEvaluator(PackingRatioEvaluator original, Cloner cloner)
: base(original, cloner) {
}
