src/Tuner/multituner.cc

   1 #include "multituner.h"
   2 #include "csolver.h"
   3 #include "searchtuner.h"
   4 #include <math.h>
   5 #include <stdlib.h>
   6 #include <float.h>
   7 #include <string.h>
   8 #include <iostream>
   9 #include <fstream>
  10
  11 #define UNSETVALUE -1
  12
  13 Problem::Problem(const char *_problem) : result(UNSETVALUE) {
  14         uint len = strlen(_problem);
  15         problem = (char *) ourmalloc(len + 1);
  16         memcpy(problem, _problem, len + 1);
  17 }
  18
  19 Problem::~Problem() {
  20         ourfree(problem);
  21 }
  22
  23 void TunerRecord::setTime(Problem *problem, long long time) {
  24         timetaken.put(problem, time);
  25 }
  26
  27 long long TunerRecord::getTime(Problem *problem) {
  28         if (timetaken.contains(problem))
  29                 return timetaken.get(problem);
  30         else return -1;
  31 }
  32
  33 TunerRecord *TunerRecord::changeTuner(SearchTuner *_newtuner) {
  34         TunerRecord *tr = new TunerRecord(_newtuner);
  35         for (uint i = 0; i < problems.getSize(); i++) {
  36                 tr->problems.push(problems.get(i));
  37         }
  38         return tr;
  39 }
  40
  41 MultiTuner::MultiTuner(uint _budget, uint _rounds, uint _timeout) :
  42         budget(_budget), rounds(_rounds), timeout(_timeout), execnum(0) {
  43 }
  44
  45 MultiTuner::~MultiTuner() {
  46         for (uint i = 0; i < problems.getSize(); i++)
  47                 ourfree(problems.get(i));
  48         for (uint i = 0; i < allTuners.getSize(); i++)
  49                 delete allTuners.get(i);
  50 }
  51
  52 void MultiTuner::addProblem(const char *filename) {
  53         problems.push(new Problem(filename));
  54 }
  55
  56 void MultiTuner::printData() {
  57         model_print("*********** DATA DUMP ***********\n");
  58         for (uint i = 0; i < allTuners.getSize(); i++) {
  59                 TunerRecord *tuner = allTuners.get(i);
  60                 SearchTuner *stun = tuner->getTuner();
  61                 model_print("Tuner %u\n", i);
  62                 stun->print();
  63                 model_print("----------------------------------\n\n\n");
  64                 for (uint j = 0; j < tuner->problems.getSize(); j++) {
  65                         Problem *problem = tuner->problems.get(j);
  66                         model_print("Problem %s\n", problem->getProblem());
  67                         model_print("Time = %lld\n", tuner->getTime(problem));
  68                 }
  69         }
  70 }
  71
  72 void MultiTuner::addTuner(SearchTuner *tuner) {
  73         TunerRecord *t = new TunerRecord(tuner);
  74         tuners.push(t);
  75         t->tunernumber = allTuners.getSize();
  76         allTuners.push(t);
  77 }
  78
  79 long long MultiTuner::evaluate(Problem *problem, TunerRecord *tuner) {
  80         char buffer[512];
  81         {
  82                 snprintf(buffer, sizeof(buffer), "problem%u", execnum);
  83
  84                 ofstream myfile;
  85                 myfile.open (buffer, ios::out);
  86
  87
  88                 if (myfile.is_open()) {
  89                         myfile << problem->getProblem() << endl;
  90                         myfile.close();
  91                 }
  92         }
  93
  94         {
  95                 snprintf(buffer, sizeof(buffer), "tunernum%u", execnum);
  96
  97                 ofstream myfile;
  98                 myfile.open (buffer, ios::out);
  99
 100
 101                 if (myfile.is_open()) {
 102                         myfile << tuner->tunernumber << endl;
 103                         myfile.close();
 104                 }
 105         }
 106
 107         //Write out the tuner
 108         snprintf(buffer, sizeof(buffer), "tuner%u", execnum);
 109         tuner->getTuner()->serialize(buffer);
 110
 111         //Do run
 112         snprintf(buffer, sizeof(buffer), "./run.sh deserializerun %s %u tuner%u result%u > log%u", problem->getProblem(), timeout, execnum, execnum, execnum);
 113         int status = system(buffer);
 114
 115         long long metric = -1;
 116         int sat = IS_INDETER;
 117
 118         if (status == 0) {
 119                 //Read data in from results file
 120                 snprintf(buffer, sizeof(buffer), "result%u", execnum);
 121
 122                 ifstream myfile;
 123                 myfile.open (buffer, ios::in);
 124
 125
 126                 if (myfile.is_open()) {
 127                         myfile >> metric;
 128                         myfile >> sat;
 129                         myfile.close();
 130                 }
 131
 132                 snprintf(buffer, sizeof(buffer), "tuner%uused", execnum);
 133                 tuner->getTuner()->addUsed(buffer);
 134         }
 135         //Increment execution count
 136         execnum++;
 137
 138         if (problem->result == UNSETVALUE && sat != IS_INDETER) {
 139                 problem->result = sat;
 140         } else if (problem->result != sat && sat != IS_INDETER) {
 141                 model_print("******** Result has changed ********\n");
 142         }
 143         return metric;
 144 }
 145
 146 void MultiTuner::tuneComp() {
 147         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 148         for (uint b = 0; b < budget; b++) {
 149                 uint tSize = tunerV->getSize();
 150                 for (uint i = 0; i < tSize; i++) {
 151                         SearchTuner *tmpTuner = mutateTuner(tunerV->get(i)->getTuner(), b);
 152                         TunerRecord *tmp = new TunerRecord(tmpTuner);
 153                         tmp->tunernumber = allTuners.getSize();
 154                         allTuners.push(tmp);
 155                         tunerV->push(tmp);
 156                 }
 157
 158                 Hashtable<TunerRecord *, int, uint64_t> scores;
 159                 for (uint i = 0; i < problems.getSize(); i++) {
 160                         Problem *problem = problems.get(i);
 161                         Vector<TunerRecord *> places;
 162                         for (uint j = 0; j < tunerV->getSize(); j++) {
 163                                 TunerRecord *tuner = tunerV->get(j);
 164                                 long long metric = tuner->getTime(problem);
 165                                 if (metric == -1) {
 166                                         metric = evaluate(problem, tuner);
 167                                         if (metric != -1)
 168                                                 tuner->setTime(problem, metric);
 169                                 }
 170                                 if (metric != -1) {
 171                                         uint k = 0;
 172                                         for (; k < places.getSize(); k++) {
 173                                                 if (metric < places.get(k)->getTime(problem))
 174                                                         break;
 175                                         }
 176                                         places.insertAt(k, tuner);
 177                                 }
 178                         }
 179                         int points = 9;
 180                         for (uint k = 0; k < places.getSize() && points; k++) {
 181                                 TunerRecord *tuner = places.get(k);
 182                                 points = points / 3;
 183                                 int currScore = 0;
 184                                 if (scores.contains(tuner))
 185                                         currScore = scores.get(tuner);
 186                                 currScore += points;
 187                                 scores.put(tuner, currScore);
 188                         }
 189                 }
 190                 Vector<TunerRecord *> ranking;
 191                 for (uint i = 0; i < tunerV->getSize(); i++) {
 192                         TunerRecord *tuner = tunerV->get(i);
 193                         int score = 0;
 194                         if (scores.contains(tuner))
 195                                 score = scores.get(tuner);
 196                         uint j = 0;
 197                         for (; j < ranking.getSize(); j++) {
 198                                 TunerRecord *t = ranking.get(j);
 199                                 int tscore = 0;
 200                                 if (scores.contains(t))
 201                                         tscore = scores.get(t);
 202                                 if (score < tscore)
 203                                         break;
 204                         }
 205                         ranking.insertAt(j, tuner);
 206                 }
 207                 for (uint i = tuners.getSize(); i < ranking.getSize(); i++) {
 208                         TunerRecord *tuner = ranking.get(i);
 209                         for (uint j = 0; j < tunerV->getSize(); j++) {
 210                                 if (tunerV->get(j) == tuner)
 211                                         tunerV->removeAt(j);
 212                         }
 213                 }
 214         }
 215         printData();
 216 }
 217
 218 void MultiTuner::mapProblemsToTuners(Vector<TunerRecord *> *tunerV) {
 219         for (uint i = 0; i < problems.getSize(); i++) {
 220                 Problem *problem = problems.get(i);
 221                 TunerRecord *bestTuner = NULL;
 222                 long long bestscore = 0;
 223                 for (uint j = 0; j < tunerV->getSize(); j++) {
 224                         TunerRecord *tuner = tunerV->get(j);
 225                         long long metric = tuner->getTime(problem);
 226                         if (metric == -1) {
 227                                 metric = evaluate(problem, tuner);
 228                                 if (metric != -1)
 229                                         tuner->setTime(problem, metric);
 230                         }
 231                         if ((bestTuner == NULL && metric != -1) ||
 232                                         (metric < bestscore && metric != -1)) {
 233                                 bestTuner = tuner;
 234                                 bestscore = metric;
 235                         }
 236                 }
 237                 if (bestTuner != NULL)
 238                         bestTuner->problems.push(problem);
 239         }
 240 }
 241
 242 void clearVector(Vector<TunerRecord *> *tunerV) {
 243         for (uint j = 0; j < tunerV->getSize(); j++) {
 244                 TunerRecord *tuner = tunerV->get(j);
 245                 tuner->problems.clear();
 246         }
 247 }
 248
 249 void MultiTuner::tuneK() {
 250         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 251         for (uint i = 0; i < rounds; i++) {
 252                 clearVector(tunerV);
 253                 mapProblemsToTuners(tunerV);
 254                 improveTuners(tunerV);
 255         }
 256         model_print("Best tuners\n");
 257         for (uint j = 0; j < tunerV->getSize(); j++) {
 258                 TunerRecord *tuner = tunerV->get(j);
 259                 char buffer[256];
 260                 sprintf(buffer, "tuner%u.conf", j);
 261                 tuner->getTuner()->serialize(buffer);
 262                 tuner->getTuner()->print();
 263         }
 264         delete tunerV;
 265 }
 266
 267 void MultiTuner::improveTuners(Vector<TunerRecord *> *tunerV) {
 268         for (uint j = 0; j < tunerV->getSize(); j++) {
 269                 TunerRecord *tuner = tunerV->get(j);
 270                 TunerRecord *newtuner = tune(tuner);
 271                 tunerV->set(j, newtuner);
 272         }
 273 }
 274
 275 double MultiTuner::evaluateAll(TunerRecord *tuner) {
 276         double product = 1;
 277         for (uint i = 0; i < tuner->problems.getSize(); i++) {
 278                 Problem *problem = tuner->problems.get(i);
 279                 long long metric = tuner->getTime(problem);
 280                 if (metric == -1) {
 281                         metric = evaluate(problem, tuner);
 282                         if (metric != -1)
 283                                 tuner->setTime(problem, metric);
 284                 }
 285
 286                 double score = metric;
 287                 product *= score;
 288         }
 289         return pow(product, 1 / ((double)tuner->problems.getSize()));
 290 }
 291
 292 SearchTuner *MultiTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
 293         SearchTuner *newTuner = oldTuner->copyUsed();
 294         uint numSettings = oldTuner->getSize();
 295         uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
 296         if (settingsToMutate < 1)
 297                 settingsToMutate = 1;
 298         model_print("Mutating %u settings\n", settingsToMutate);
 299         while (settingsToMutate-- != 0) {
 300                 newTuner->randomMutate();
 301         }
 302         return newTuner;
 303 }
 304
 305 TunerRecord *MultiTuner::tune(TunerRecord *tuner) {
 306         TunerRecord *bestTuner = NULL;
 307         double bestScore = DBL_MAX;
 308
 309         TunerRecord *oldTuner = tuner;
 310         double base_temperature = evaluateAll(oldTuner);
 311         double oldScore = base_temperature;
 312
 313         for (uint i = 0; i < budget; i++) {
 314                 SearchTuner *tmpTuner = mutateTuner(oldTuner->getTuner(), i);
 315                 TunerRecord *newTuner = oldTuner->changeTuner(tmpTuner);
 316                 newTuner->tunernumber = allTuners.getSize();
 317                 allTuners.push(newTuner);
 318                 double newScore = evaluateAll(newTuner);
 319                 newTuner->tuner->printUsed();
 320                 model_print("Received score %f\n", newScore);
 321                 double scoreDiff = newScore - oldScore; //smaller is better
 322                 if (newScore < bestScore) {
 323                         bestScore = newScore;
 324                         bestTuner = newTuner;
 325                 }
 326
 327                 double acceptanceP;
 328                 if (scoreDiff < 0) {
 329                         acceptanceP = 1;
 330                 } else {
 331                         double currTemp = base_temperature * (((double)budget - i) / budget);
 332                         acceptanceP = exp(-scoreDiff / currTemp);
 333                 }
 334                 double ran = ((double)random()) / RAND_MAX;
 335                 if (ran <= acceptanceP) {
 336                         oldScore = newScore;
 337                         oldTuner = newTuner;
 338                 }
 339         }
 340
 341         return bestTuner;
 342 }
 343