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::addTuner(SearchTuner *tuner) {
  57         TunerRecord *t = new TunerRecord(tuner);
  58         tuners.push(t);
  59         allTuners.push(t);
  60 }
  61
  62 long long MultiTuner::evaluate(Problem *problem, TunerRecord *tuner) {
  63         char buffer[512];
  64         //Write out the tuner
  65         snprintf(buffer, sizeof(buffer), "tuner%u", execnum);
  66         tuner->getTuner()->serialize(buffer);
  67
  68         //Do run
  69         snprintf(buffer, sizeof(buffer), "./run.sh deserializerun %s %u tuner%u result%u > log%u", problem->getProblem(), timeout, execnum, execnum, execnum);
  70         int status = system(buffer);
  71
  72         long long metric = -1;
  73         int sat = IS_INDETER;
  74
  75         if (status == 0) {
  76                 //Read data in from results file
  77                 snprintf(buffer, sizeof(buffer), "result%u", execnum);
  78
  79                 ifstream myfile;
  80                 myfile.open (buffer, ios::in);
  81
  82
  83                 if (myfile.is_open()) {
  84                         myfile >> metric;
  85                         myfile >> sat;
  86                         myfile.close();
  87                 }
  88
  89                 snprintf(buffer, sizeof(buffer), "tuner%uused", execnum);
  90                 tuner->getTuner()->addUsed(buffer);
  91         }
  92         //Increment execution count
  93         execnum++;
  94
  95         if (problem->result == UNSETVALUE && sat != IS_INDETER) {
  96                 problem->result = sat;
  97         } else if (problem->result != sat && sat != IS_INDETER) {
  98                 model_print("******** Result has changed ********\n");
  99         }
 100         return metric;
 101 }
 102
 103 void MultiTuner::tuneComp() {
 104         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 105         for (uint b = 0; b < budget; b++) {
 106                 uint tSize = tunerV->getSize();
 107                 for (uint i = 0; i < tSize; i++) {
 108                         SearchTuner *tmpTuner = mutateTuner(tunerV->get(i)->getTuner(), b);
 109                         TunerRecord * tmp = new TunerRecord(tmpTuner);
 110                         tunerV->push(tmp);
 111                         allTuners.push(tmp);
 112                 }
 113
 114                 Hashtable<TunerRecord *, int, uint64_t> scores;
 115                 for (uint i = 0; i < problems.getSize(); i++) {
 116                         Problem *problem = problems.get(i);
 117                         Vector<TunerRecord *> places;
 118                         for (uint j = 0; j < tunerV->getSize(); j++) {
 119                                 TunerRecord *tuner = tunerV->get(j);
 120                                 long long metric = tuner->getTime(problem);
 121                                 if (metric == -1) {
 122                                         metric = evaluate(problem, tuner);
 123                                         tuner->problems.push(problem);
 124                                         tuner->timetaken.put(problem, metric);
 125                                         DEBUG("%u.Problem<%s>\tTuner<%p>\tMetric<%lld>\n", i, problem->problem,tuner, metric);
 126                                         DEBUG("*****************************\n");
 127                                         if (metric != -1)
 128                                                 tuner->setTime(problem, metric);
 129                                 }
 130                                 if (metric != -1) {
 131                                         uint k = 0;
 132                                         for (; k < places.getSize(); k++) {
 133                                                 if (metric < places.get(k)->getTime(problem))
 134                                                         break;
 135                                         }
 136                                         DEBUG("place[%u]=Tuner<%p>\n", k, tuner);
 137                                         places.insertAt(k, tuner);
 138                                 }
 139                         }
 140                         int points = 9;
 141                         for (uint k = 0; k < places.getSize() && points; k++) {
 142                                 TunerRecord *tuner = places.get(k);
 143                                 int currScore = 0;
 144                                 if (scores.contains(tuner))
 145                                         currScore = scores.get(tuner);
 146                                 currScore += points;
 147                                 DEBUG("Problem<%s>\tTuner<%p>\tmetric<%d>\n", problem->problem, tuner, currScore);
 148                                 DEBUG("**************************\n");
 149                                 scores.put(tuner, currScore);
 150                                 points = points / 3;
 151                         }
 152                 }
 153                 Vector<TunerRecord *> ranking;
 154                 for (uint i = 0; i < tunerV->getSize(); i++) {
 155                         TunerRecord *tuner = tunerV->get(i);
 156                         int score = 0;
 157                         if (scores.contains(tuner))
 158                                 score = scores.get(tuner);
 159                         uint j = 0;
 160                         for (; j < ranking.getSize(); j++) {
 161                                 TunerRecord *t = ranking.get(j);
 162                                 int tscore = 0;
 163                                 if (scores.contains(t))
 164                                         tscore = scores.get(t);
 165                                 if (score > tscore)
 166                                         break;
 167                         }
 168                         DEBUG("ranking[%u]=tuner<%p>(Score=%d)\n", j, tuner, score);
 169                         DEBUG("************************\n");
 170                         ranking.insertAt(j, tuner);
 171                 }
 172                 model_print("tunerSize=%u\trankingSize=%u\ttunerVSize=%u\n", tuners.getSize(), ranking.getSize(), tunerV->getSize());
 173                 for (uint i = tuners.getSize(); i < ranking.getSize(); i++) {
 174                         TunerRecord *tuner = ranking.get(i);
 175                         for (uint j = 0; j < tunerV->getSize(); j++) {
 176                                 if (tunerV->get(j) == tuner)
 177                                         tunerV->removeAt(j);
 178                         }
 179                 }
 180         }
 181 //      model_print("Done with the learning...\n");
 182 //      for(uint i=0; i<allTuners.getSize(); i++){
 183 //              TunerRecord *tuner = allTuners.get(i);
 184 //              for(uint j=0; j<tuner->problems.getSize(); j++){
 185 //                      Problem *problem = tuner->problems.get(j);
 186 //                      DEBUG("******Problem<%p>\tscore=%llu\n", problem, tuner->timetaken.get(problem));
 187 //              }
 188 //              DEBUG("*********Problems.size=%u********************\n", tuner->problems.getSize());
 189 //
 190 //      }
 191 }
 192
 193 void MultiTuner::mapProblemsToTuners(Vector<TunerRecord *> *tunerV) {
 194         for (uint i = 0; i < problems.getSize(); i++) {
 195                 Problem *problem = problems.get(i);
 196                 TunerRecord *bestTuner = NULL;
 197                 long long bestscore = 0;
 198                 for (uint j = 0; j < tunerV->getSize(); j++) {
 199                         TunerRecord *tuner = tunerV->get(j);
 200                         long long metric = tuner->getTime(problem);
 201                         if (metric == -1) {
 202                                 metric = evaluate(problem, tuner);
 203                                 if (metric != -1)
 204                                         tuner->setTime(problem, metric);
 205                         }
 206                         if ((bestTuner == NULL && metric != -1) ||
 207                                         (metric < bestscore && metric != -1)) {
 208                                 bestTuner = tuner;
 209                                 bestscore = metric;
 210                         }
 211                 }
 212                 if (bestTuner != NULL)
 213                         bestTuner->problems.push(problem);
 214         }
 215 }
 216
 217 void clearVector(Vector<TunerRecord *> *tunerV) {
 218         for (uint j = 0; j < tunerV->getSize(); j++) {
 219                 TunerRecord *tuner = tunerV->get(j);
 220                 tuner->problems.clear();
 221         }
 222 }
 223
 224 void MultiTuner::tuneK() {
 225         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 226         for (uint i = 0; i < rounds; i++) {
 227                 clearVector(tunerV);
 228                 mapProblemsToTuners(tunerV);
 229                 improveTuners(tunerV);
 230         }
 231         model_print("Best tuners\n");
 232         for (uint j = 0; j < tunerV->getSize(); j++) {
 233                 TunerRecord *tuner = tunerV->get(j);
 234                 char buffer[256];
 235                 sprintf(buffer, "tuner%u.conf", j);
 236                 tuner->getTuner()->serialize(buffer);
 237                 tuner->getTuner()->print();
 238         }
 239         delete tunerV;
 240 }
 241
 242 void MultiTuner::improveTuners(Vector<TunerRecord *> *tunerV) {
 243         for (uint j = 0; j < tunerV->getSize(); j++) {
 244                 TunerRecord *tuner = tunerV->get(j);
 245                 TunerRecord *newtuner = tune(tuner);
 246                 tunerV->set(j, newtuner);
 247         }
 248 }
 249
 250 double MultiTuner::evaluateAll(TunerRecord *tuner) {
 251         double product = 1;
 252         for (uint i = 0; i < tuner->problems.getSize(); i++) {
 253                 Problem *problem = tuner->problems.get(i);
 254                 long long metric = tuner->getTime(problem);
 255                 if (metric == -1) {
 256                         metric = evaluate(problem, tuner);
 257                         if (metric != -1)
 258                                 tuner->setTime(problem, metric);
 259                 }
 260
 261                 double score = metric;
 262                 product *= score;
 263         }
 264         return pow(product, 1 / ((double)tuner->problems.getSize()));
 265 }
 266
 267 SearchTuner *MultiTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
 268         SearchTuner *newTuner = oldTuner->copyUsed();
 269         uint numSettings = oldTuner->getSize();
 270         uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
 271         if (settingsToMutate < 1)
 272                 settingsToMutate = 1;
 273         model_print("Mutating %u settings\n", settingsToMutate);
 274         while (settingsToMutate-- != 0) {
 275                 newTuner->randomMutate();
 276         }
 277         return newTuner;
 278 }
 279
 280 TunerRecord *MultiTuner::tune(TunerRecord *tuner) {
 281         TunerRecord *bestTuner = NULL;
 282         double bestScore = DBL_MAX;
 283
 284         TunerRecord *oldTuner = tuner;
 285         double base_temperature = evaluateAll(oldTuner);
 286         double oldScore = base_temperature;
 287
 288         for (uint i = 0; i < budget; i++) {
 289                 SearchTuner *tmpTuner = mutateTuner(oldTuner->getTuner(), i);
 290                 TunerRecord *newTuner = oldTuner->changeTuner(tmpTuner);
 291                 allTuners.push(newTuner);
 292                 double newScore = evaluateAll(newTuner);
 293                 newTuner->tuner->printUsed();
 294                 model_print("Received score %f\n", newScore);
 295                 double scoreDiff = newScore - oldScore; //smaller is better
 296                 if (newScore < bestScore) {
 297                         bestScore = newScore;
 298                         bestTuner = newTuner;
 299                 }
 300
 301                 double acceptanceP;
 302                 if (scoreDiff < 0) {
 303                         acceptanceP = 1;
 304                 } else {
 305                         double currTemp = base_temperature * (((double)budget - i) / budget);
 306                         acceptanceP = exp(-scoreDiff / currTemp);
 307                 }
 308                 double ran = ((double)random()) / RAND_MAX;
 309                 if (ran <= acceptanceP) {
 310                         oldScore = newScore;
 311                         oldTuner = newTuner;
 312                 }
 313         }
 314
 315         return bestTuner;
 316 }
 317