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我已經使用AnyLogic構建了我的第一個基於代理的模型,現在我需要校準它。我嘗試了可用的實驗,但它耗時太長,我無法模擬超過10,000個代理。所以我想嘗試一下自定義實驗......但是我不知道如何構建它!AnyLogic - 如何創建自定義實驗
我建立了一個非常簡單的模型 其中參數是bernoulli(main.calib)
,然後我希望最大化的那個走在最後的國家工作人員的數量。
我複製從提供幫助的實驗代碼,做了一些小的調整
try {
// Create Engine, initialize random number generator:
Engine engine = createEngine();
// Set stop time:
engine.setStopTime(2);
// Create optimization variable
final COptQuestContinuousVariable v = new COptQuestContinuousVariable();
v.SetLowerBound(0.0);
v.SetUpperBound(1.0);
// Create objective
final COptQuestObjective obj = new COptQuestUserControlledObjective();
obj.SetMaximize();
// Create optimization engine
final COptQuestOptimization opt = ExperimentOptimization.createOptimization(engine, new OptimizationCallback() {
@Override
public void evaluate(COptQuestOptimization optimization,
COptQuestSolution solution, Engine engine) {
try {
// Create new root object:
Main root = new Main(engine, null, null);
// Setup parameters of root object here
root.calib = solution.GetVariableValue(v);
// Prepare Engine for simulation:
engine.start(root);
// Start simulation in fast mode:
engine.runFast();
// Process results of simulation here
solution.SetObjectiveValue(obj, root.end);
// Destroy the model:
engine.stop();
} catch (COptQuestException e) {
traceln(e.Description());
}
}
// Trace each iteration (optional!)
@Override
public void monitorStatus(COptQuestOptimization optimization,
COptQuestSolution solution, Engine engine) {
try {
traceln(String.format(" %3d : %6.2f : %8.2f -- %8.2f",
solution.GetIteration(), solution.GetVariableValue(v),
solution.GetObjectiveValue(),
optimization.GetBestSolution() != null ?
optimization.GetBestSolution().GetObjectiveValue(obj) : Double.NaN));
} catch (COptQuestException e) {
traceln(e.Description());
}
}
});
// Setup optimization engine
opt.AddVariable(v);
opt.AddObjective(obj);
// Set the number of iterations to run
opt.SetMaximumIterations(30);
// Add suggested solution (initial solution)
COptQuestSolution suggestedSolution = opt.CreateSolution();
suggestedSolution.SetVariableValue(v, 0.5);
opt.AddSuggestedSolution(suggestedSolution);
traceln(" Iter : Param : Objective -- Best obj.");
traceln("-------------------------------------------");
// Perform optimization
opt.Optimize();
traceln("-------------------------------------------");
// Output results
COptQuestSolution bestSolution = opt.GetBestSolution();
traceln("Best objective: " + format(bestSolution.GetObjectiveValue(obj)));
traceln(" is feasible: " + format(bestSolution.IsFeasible()));
traceln("Best parameter: " + format(bestSolution.GetVariableValue(v)));
traceln("Best iteration: " + bestSolution.GetIteration());
} catch (COptQuestException e) { traceln(e.Description()); }
和下面是結果...
我不明白爲什麼客觀總是零...
感謝您的幫助!
我還沒有很多的自定義實驗。主要是參數變化。但是你在哪裏告訴實驗最後階段的代理人數量? –