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