/**
* Creates a new user/environment simulator.
*
* @param system the main dialogue system to which the simulator should connect
* @param domain the dialogue domain for the simulator not be created
*/
public Simulator(DialogueSystem system, Domain domain) {
this.system = system;
this.domain = domain;
simulatorState = domain.getInitialState().copy();
simulatorState.setParameters(domain.getParameters());
this.system.changeSettings(domain.getSettings());
}
/**
* Performs the dialogue turn in the simulator.
*
* @param systemAction the last system action. @
*/
private synchronized boolean performTurn(Value systemAction) {
boolean turnPerformed = false;
simulatorState.setParameters(domain.getParameters());
Assignment systemAssign = new Assignment(system.getSettings().systemOutput, systemAction);
simulatorState.addToState(systemAssign);
while (!simulatorState.getNewVariables().isEmpty()) {
Set<String> toProcess = simulatorState.getNewVariables();
simulatorState.reduce();
for (Model model : domain.getModels()) {
if (model.isTriggered(simulatorState, toProcess)) {
boolean change = model.trigger(simulatorState);
if (change && model.isBlocking()) {
break;
}
}
}
if (!simulatorState.getUtilityNodeIds().isEmpty()) {
double reward = simulatorState.queryUtil();
String comment = "Reward: " + StringUtils.getShortForm(reward);
system.displayComment(comment);
system
.getState()
.addEvidence(new Assignment("R(" + systemAssign.addPrimes() + ")", reward));
simulatorState.removeNodes(simulatorState.getUtilityNodeIds());
}
if (addNewObservations()) {
turnPerformed = true;
}
simulatorState.addEvidence(simulatorState.getSample());
}
return turnPerformed;
}