/// <summary>
/// Cools system until it reaches minimal, targeted temperature.
/// </summary>
/// <param name="algorithm">Simulated annealing algorithm being cooled.</param>
/// <param name="coolingAction">Delegate of action to cool system by one step of cooling ratio.</param>
/// <returns>Processor time cost</returns>
//TODO: Possibly a more narrow dependency to something like ISimulatedAnnealing to not force cast for CurrentTemperature access?
public IEnumerable <IAlgorithmProgressReport> Cool(IAlgorithm algorithm, Action coolingAction)
{
if (algorithm == null)
{
throw new ArgumentException(nameof(algorithm));
}
if (coolingAction == null)
{
throw new ArgumentException(nameof(coolingAction));
}
var startTime = DateTime.Now.Ticks;
while (algorithm.CanContinueSearching())
{
//Pick random node from graph and keep on adding them to solution until correctness criteria is met
HashSet <Node> proposedSolution = new HashSet <Node>();
List <Node> nodesCopy = algorithm.Graph.Nodes;
Stack <int> randomIndexes = new Stack <int>(Enumerable.Range(0, nodesCopy.Count).OrderBy(r => _random.Next()));
while (!algorithm.Problem.IsSolutionCorrect(proposedSolution))
{
proposedSolution.Add(nodesCopy[randomIndexes.Pop()]);
}
bool wasAccepted = false;
//Accept the answer if algorithm allows
if (algorithm.CanAcceptAnswer(proposedSolution))
{
algorithm.Problem.SetNewSolution(proposedSolution);
wasAccepted = true;
}
var casted = algorithm as SimulatedAnnealing;
var currentTemp = casted == null ? 0 : casted.CurrentTemperature;
yield return(new SimulatedAnnealingProgressReport(DateTime.Now.Ticks - startTime, algorithm.Problem.CurrentSolution, (uint)(algorithm.Graph.TotalNodes - algorithm.Problem.CurrentSolution.Count + 1), currentTemp, wasAccepted));
//Cool system
coolingAction.Invoke();
}
}
/// <summary>
/// Cools system until it reaches minimal, targeted temperature.
/// </summary>
/// <param name="algorithm">Simulated annealing algorithm being cooled.</param>
/// <param name="coolingAction">Delegate of action to cool system by one step of cooling ratio.</param>
/// <returns>Processor time cost</returns>
//TODO: Possibly a more narrow dependency to something like ISimulatedAnnealing to not force cast for CurrentTemperature access?
public IEnumerable<IAlgorithmProgressReport> Cool(IAlgorithm algorithm, Action coolingAction)
{
if (algorithm == null) throw new ArgumentException(nameof(algorithm));
if (coolingAction == null) throw new ArgumentException(nameof(coolingAction));
var startTime = DateTime.Now.Ticks;
while (algorithm.CanContinueSearching())
{
//Pick random node from graph and keep on adding them to solution until correctness criteria is met
HashSet<Node> proposedSolution = new HashSet<Node>();
List<Node> nodesCopy = algorithm.Graph.Nodes;
Stack<int> randomIndexes = new Stack<int>(Enumerable.Range(0, nodesCopy.Count).OrderBy(r => _random.Next()));
while (!algorithm.Problem.IsSolutionCorrect(proposedSolution))
{
proposedSolution.Add(nodesCopy[randomIndexes.Pop()]);
}
bool wasAccepted = false;
//Accept the answer if algorithm allows
if (algorithm.CanAcceptAnswer(proposedSolution))
{
algorithm.Problem.SetNewSolution(proposedSolution);
wasAccepted = true;
}
var casted = algorithm as SimulatedAnnealing;
var currentTemp = casted == null ? 0 : casted.CurrentTemperature;
yield return new SimulatedAnnealingProgressReport(DateTime.Now.Ticks - startTime, algorithm.Problem.CurrentSolution, (uint)(algorithm.Graph.TotalNodes - algorithm.Problem.CurrentSolution.Count + 1), currentTemp, wasAccepted);
//Cool system
coolingAction.Invoke();
}
}