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         allTuners.push(t);
  76 }
  77
  78 long long MultiTuner::evaluate(Problem *problem, TunerRecord *tuner) {
  79         char buffer[512];
  80         {
  81                 snprintf(buffer, sizeof(buffer), "problem%u", execnum);
  82
  83                 ofstream myfile;
  84                 myfile.open (buffer, ios::out);
  85
  86
  87                 if (myfile.is_open()) {
  88                         myfile << problem->getProblem() << endl;
  89                         myfile.close();
  90                 }
  91         }
  92
  93         //Write out the tuner
  94         snprintf(buffer, sizeof(buffer), "tuner%u", execnum);
  95         tuner->getTuner()->serialize(buffer);
  96
  97         //Do run
  98         snprintf(buffer, sizeof(buffer), "./run.sh deserializerun %s %u tuner%u result%u > log%u", problem->getProblem(), timeout, execnum, execnum, execnum);
  99         int status = system(buffer);
 100
 101         long long metric = -1;
 102         int sat = IS_INDETER;
 103
 104         if (status == 0) {
 105                 //Read data in from results file
 106                 snprintf(buffer, sizeof(buffer), "result%u", execnum);
 107
 108                 ifstream myfile;
 109                 myfile.open (buffer, ios::in);
 110
 111
 112                 if (myfile.is_open()) {
 113                         myfile >> metric;
 114                         myfile >> sat;
 115                         myfile.close();
 116                 }
 117
 118                 snprintf(buffer, sizeof(buffer), "tuner%uused", execnum);
 119                 tuner->getTuner()->addUsed(buffer);
 120         }
 121         //Increment execution count
 122         execnum++;
 123
 124         if (problem->result == UNSETVALUE && sat != IS_INDETER) {
 125                 problem->result = sat;
 126         } else if (problem->result != sat && sat != IS_INDETER) {
 127                 model_print("******** Result has changed ********\n");
 128         }
 129         return metric;
 130 }
 131
 132 void MultiTuner::tuneComp() {
 133         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 134         for (uint b = 0; b < budget; b++) {
 135                 uint tSize = tunerV->getSize();
 136                 for (uint i = 0; i < tSize; i++) {
 137                         SearchTuner *tmpTuner = mutateTuner(tunerV->get(i)->getTuner(), b);
 138                         TunerRecord *tmp = new TunerRecord(tmpTuner);
 139                         allTuners.push(tmp);
 140                         tunerV->push(tmp);
 141                 }
 142
 143                 Hashtable<TunerRecord *, int, uint64_t> scores;
 144                 for (uint i = 0; i < problems.getSize(); i++) {
 145                         Problem *problem = problems.get(i);
 146                         Vector<TunerRecord *> places;
 147                         for (uint j = 0; j < tunerV->getSize(); j++) {
 148                                 TunerRecord *tuner = tunerV->get(j);
 149                                 long long metric = tuner->getTime(problem);
 150                                 if (metric == -1) {
 151                                         metric = evaluate(problem, tuner);
 152                                         if (metric != -1)
 153                                                 tuner->setTime(problem, metric);
 154                                 }
 155                                 if (metric != -1) {
 156                                         uint k = 0;
 157                                         for (; k < places.getSize(); k++) {
 158                                                 if (metric < places.get(k)->getTime(problem))
 159                                                         break;
 160                                         }
 161                                         places.insertAt(k, tuner);
 162                                 }
 163                         }
 164                         int points = 9;
 165                         for (uint k = 0; k < places.getSize() && points; k++) {
 166                                 TunerRecord *tuner = places.get(k);
 167                                 points = points / 3;
 168                                 int currScore = 0;
 169                                 if (scores.contains(tuner))
 170                                         currScore = scores.get(tuner);
 171                                 currScore += points;
 172                                 scores.put(tuner, currScore);
 173                         }
 174                 }
 175                 Vector<TunerRecord *> ranking;
 176                 for (uint i = 0; i < tunerV->getSize(); i++) {
 177                         TunerRecord *tuner = tunerV->get(i);
 178                         int score = 0;
 179                         if (scores.contains(tuner))
 180                                 score = scores.get(tuner);
 181                         uint j = 0;
 182                         for (; j < ranking.getSize(); j++) {
 183                                 TunerRecord *t = ranking.get(j);
 184                                 int tscore = 0;
 185                                 if (scores.contains(t))
 186                                         tscore = scores.get(t);
 187                                 if (score < tscore)
 188                                         break;
 189                         }
 190                         ranking.insertAt(j, tuner);
 191                 }
 192                 for (uint i = tuners.getSize(); i < ranking.getSize(); i++) {
 193                         TunerRecord *tuner = ranking.get(i);
 194                         for (uint j = 0; j < tunerV->getSize(); j++) {
 195                                 if (tunerV->get(j) == tuner)
 196                                         tunerV->removeAt(j);
 197                         }
 198                 }
 199         }
 200         printData();
 201 }
 202
 203 void MultiTuner::mapProblemsToTuners(Vector<TunerRecord *> *tunerV) {
 204         for (uint i = 0; i < problems.getSize(); i++) {
 205                 Problem *problem = problems.get(i);
 206                 TunerRecord *bestTuner = NULL;
 207                 long long bestscore = 0;
 208                 for (uint j = 0; j < tunerV->getSize(); j++) {
 209                         TunerRecord *tuner = tunerV->get(j);
 210                         long long metric = tuner->getTime(problem);
 211                         if (metric == -1) {
 212                                 metric = evaluate(problem, tuner);
 213                                 if (metric != -1)
 214                                         tuner->setTime(problem, metric);
 215                         }
 216                         if ((bestTuner == NULL && metric != -1) ||
 217                                         (metric < bestscore && metric != -1)) {
 218                                 bestTuner = tuner;
 219                                 bestscore = metric;
 220                         }
 221                 }
 222                 if (bestTuner != NULL)
 223                         bestTuner->problems.push(problem);
 224         }
 225 }
 226
 227 void clearVector(Vector<TunerRecord *> *tunerV) {
 228         for (uint j = 0; j < tunerV->getSize(); j++) {
 229                 TunerRecord *tuner = tunerV->get(j);
 230                 tuner->problems.clear();
 231         }
 232 }
 233
 234 void MultiTuner::tuneK() {
 235         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 236         for (uint i = 0; i < rounds; i++) {
 237                 clearVector(tunerV);
 238                 mapProblemsToTuners(tunerV);
 239                 improveTuners(tunerV);
 240         }
 241         model_print("Best tuners\n");
 242         for (uint j = 0; j < tunerV->getSize(); j++) {
 243                 TunerRecord *tuner = tunerV->get(j);
 244                 char buffer[256];
 245                 sprintf(buffer, "tuner%u.conf", j);
 246                 tuner->getTuner()->serialize(buffer);
 247                 tuner->getTuner()->print();
 248         }
 249         delete tunerV;
 250 }
 251
 252 void MultiTuner::improveTuners(Vector<TunerRecord *> *tunerV) {
 253         for (uint j = 0; j < tunerV->getSize(); j++) {
 254                 TunerRecord *tuner = tunerV->get(j);
 255                 TunerRecord *newtuner = tune(tuner);
 256                 tunerV->set(j, newtuner);
 257         }
 258 }
 259
 260 double MultiTuner::evaluateAll(TunerRecord *tuner) {
 261         double product = 1;
 262         for (uint i = 0; i < tuner->problems.getSize(); i++) {
 263                 Problem *problem = tuner->problems.get(i);
 264                 long long metric = tuner->getTime(problem);
 265                 if (metric == -1) {
 266                         metric = evaluate(problem, tuner);
 267                         if (metric != -1)
 268                                 tuner->setTime(problem, metric);
 269                 }
 270
 271                 double score = metric;
 272                 product *= score;
 273         }
 274         return pow(product, 1 / ((double)tuner->problems.getSize()));
 275 }
 276
 277 SearchTuner *MultiTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
 278         SearchTuner *newTuner = oldTuner->copyUsed();
 279         uint numSettings = oldTuner->getSize();
 280         uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
 281         if (settingsToMutate < 1)
 282                 settingsToMutate = 1;
 283         model_print("Mutating %u settings\n", settingsToMutate);
 284         while (settingsToMutate-- != 0) {
 285                 newTuner->randomMutate();
 286         }
 287         return newTuner;
 288 }
 289
 290 TunerRecord *MultiTuner::tune(TunerRecord *tuner) {
 291         TunerRecord *bestTuner = NULL;
 292         double bestScore = DBL_MAX;
 293
 294         TunerRecord *oldTuner = tuner;
 295         double base_temperature = evaluateAll(oldTuner);
 296         double oldScore = base_temperature;
 297
 298         for (uint i = 0; i < budget; i++) {
 299                 SearchTuner *tmpTuner = mutateTuner(oldTuner->getTuner(), i);
 300                 TunerRecord *newTuner = oldTuner->changeTuner(tmpTuner);
 301                 allTuners.push(newTuner);
 302                 double newScore = evaluateAll(newTuner);
 303                 newTuner->tuner->printUsed();
 304                 model_print("Received score %f\n", newScore);
 305                 double scoreDiff = newScore - oldScore; //smaller is better
 306                 if (newScore < bestScore) {
 307                         bestScore = newScore;
 308                         bestTuner = newTuner;
 309                 }
 310
 311                 double acceptanceP;
 312                 if (scoreDiff < 0) {
 313                         acceptanceP = 1;
 314                 } else {
 315                         double currTemp = base_temperature * (((double)budget - i) / budget);
 316                         acceptanceP = exp(-scoreDiff / currTemp);
 317                 }
 318                 double ran = ((double)random()) / RAND_MAX;
 319                 if (ran <= acceptanceP) {
 320                         oldScore = newScore;
 321                         oldTuner = newTuner;
 322                 }
 323         }
 324
 325         return bestTuner;
 326 }
 327