public static void Improve(Permutation assignment, DoubleMatrix distances, DoubleValue quality, IntValue localIterations, IntValue evaluatedSolutions, bool maximization, int maxIterations, ItemList <BoolArray> realizations, CancellationToken cancellation)
{
var distanceM = (DistanceMatrix)distances;
Func <int, int, double> distance = (a, b) => distanceM[a, b];
for (var i = localIterations.Value; i < maxIterations; i++)
{
TwoPointFiveMove bestMove = null;
var bestQuality = 0.0; // we have to make an improvement, so 0 is the baseline
var evaluations = 0.0;
foreach (var move in ExhaustiveTwoPointFiveMoveGenerator.Generate(assignment))
{
var moveQuality = PTSPEstimatedTwoPointFiveMoveEvaluator.EvaluateMove(assignment, move, distance, realizations);
if (move.IsInvert)
{
evaluations += realizations.Count * 4.0 / (assignment.Length * assignment.Length);
}
else
{
evaluations += realizations.Count * 6.0 / (assignment.Length * assignment.Length);
}
if (maximization && moveQuality > bestQuality ||
!maximization && moveQuality < bestQuality)
{
bestQuality = moveQuality;
bestMove = move;
}
}
evaluatedSolutions.Value += (int)Math.Ceiling(evaluations);
if (bestMove == null)
{
break;
}
TwoPointFiveMoveMaker.Apply(assignment, bestMove);
quality.Value += bestQuality;
localIterations.Value++;
cancellation.ThrowIfCancellationRequested();
}
}
protected PTSPEstimatedTwoPointFiveMoveEvaluator(PTSPEstimatedTwoPointFiveMoveEvaluator original, Cloner cloner) : base(original, cloner)
{
}
protected PTSPEstimatedTwoPointFiveMoveEvaluator(PTSPEstimatedTwoPointFiveMoveEvaluator original, Cloner cloner) : base(original, cloner) { }