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