3 #include "searchtuner.h"
9 #define TIMEOUTSEC 5000
10 AutoTuner::AutoTuner(uint _budget) :
11 budget(_budget), result(UNSETVALUE) {
14 AutoTuner::~AutoTuner() {}
16 void AutoTuner::addProblem(CSolver *solver) {
20 long long AutoTuner::evaluate(CSolver *problem, SearchTuner *tuner) {
21 CSolver *copy = problem->clone();
22 copy->setTuner(tuner);
23 copy->setSatSolverTimeout(TIMEOUTSEC);
24 model_print("**********************\n");
25 int sat = copy->solve();
26 if (result == UNSETVALUE && sat != IS_INDETER)
28 else if (result != sat && sat != IS_INDETER) {
29 model_print("&&&&&&&&&&&&&&&&&& Result has changed &&&&&&&&&&&&&\n");
30 copy->printConstraints();
32 long long metric = copy->getElapsedTime();
37 double AutoTuner::evaluateAll(SearchTuner *tuner) {
39 for (uint i = 0; i < solvers.getSize(); i++) {
40 CSolver *problem = solvers.get(i);
41 double score = evaluate(problem, tuner);
44 return pow(product, 1 / ((double)solvers.getSize()));
47 SearchTuner *AutoTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
48 SearchTuner *newTuner = oldTuner->copyUsed();
49 uint numSettings = oldTuner->getSize();
50 uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
51 if (settingsToMutate < 1)
53 model_print("Mutating %u settings\n", settingsToMutate);
54 while (settingsToMutate-- != 0) {
55 newTuner->randomMutate();
60 void AutoTuner::tune() {
61 SearchTuner *bestTuner = NULL;
62 double bestScore = DBL_MAX;
64 SearchTuner *oldTuner = new SearchTuner();
65 double base_temperature = evaluateAll(oldTuner);
66 double oldScore = base_temperature;
68 for (uint i = 0; i < budget; i++) {
69 SearchTuner *newTuner = mutateTuner(oldTuner, i);
70 double newScore = evaluateAll(newTuner);
71 newTuner->printUsed();
72 model_print("Received score %f\n", newScore);
73 double scoreDiff = newScore - oldScore; //smaller is better
74 if (newScore < bestScore) {
75 if (bestTuner != NULL)
78 bestTuner = newTuner->copyUsed();
85 double currTemp = base_temperature * (((double)budget - i) / budget);
86 acceptanceP = exp(-scoreDiff / currTemp);
88 double ran = ((double)random()) / RAND_MAX;
89 if (ran <= acceptanceP) {
97 model_print("Best tuner:\n");
99 bestTuner->serialize("TUNER.conf");
100 model_print("Received score %f\n", bestScore);
101 if (bestTuner != NULL)