// optimal cost of -1 represents no solution!
private void TestSolver <TProblemState>(ISearchAlgorithm <TProblemState> solver, IProblem <TProblemState> problem, double optimalCost)
where TProblemState : IProblemState <TProblemState>
{
output.WriteLine(solver.ToString());
var timer = new Stopwatch();
double lastTotalS = 0d;
ulong lastEvals = 0UL;
// https://docs.microsoft.com/en-us/dotnet/api/system.timers.timer?view=netframework-4.7.2
var reportingTimer = new Timer(10_000);
Action reportingHeartbeat = () => {
var currentTotalS = timer.Elapsed.TotalSeconds;
var currentEvals = solver.StatesEvaluated;
var statesPerSecond = (currentEvals - lastEvals) / (currentTotalS - lastTotalS);
output.WriteLine($"evals: {solver.StatesEvaluated:#,0} ms: {timer.Elapsed.TotalMilliseconds} S/s: {statesPerSecond:#,#.###} cost: {solver.MaxCostEvaulated}");
lastTotalS = currentTotalS;
lastEvals = currentEvals;
};
reportingTimer.Elapsed += (Object source, ElapsedEventArgs e) => reportingHeartbeat();
reportingTimer.AutoReset = true;
reportingTimer.Enabled = true;
timer.Start();
var solution = solver.Solve(problem);
timer.Stop();
reportingTimer.Enabled = false;
reportingHeartbeat();
output.WriteLine("Time: {0}", timer.Elapsed);
if (solution == null)
{
Assert.True(optimalCost == -1d, "Found no solution but one should exist.");
}
else
{
var state = problem.GetInitialState();
output.WriteLine("Initial State ----------------");
output.WriteLine(state.ToString());
int i = 0;
double stepCost, totalCost = 0d;
foreach (var move in solution)
{
i++;
(state, stepCost) = problem.ApplyAction(state, move);
totalCost += stepCost;
//output.WriteLine(state.ToString());
}
output.WriteLine("Final State ({0} moves, {1} cost) ----------------", i, totalCost);
output.WriteLine(state.ToString());
Assert.True(problem.IsGoal(state), "Non-goal state claimed to be goal.");
Assert.True(Math.Abs(optimalCost - totalCost) < 1e-8, "Found a non optimal cost: expected = " + optimalCost + "; actual = " + totalCost);
}
}
private static SolverStats SolveAndRecordStats(ISearchAlgorithm <VacuumWorldState, VacuumWorldAction> solver)
{
var stats = new SolverStats();
var stopwatch = Stopwatch.StartNew();
solver.Solve();
stats.TimeToFinish = stopwatch.Elapsed;
stats.NumberOfExploredStates = solver.NumberOfExploredStates;
stats.FoundSolution = solver.IsSolved;
stats.SolutionCost = solver.GetSolution().Count();
return(stats);
}