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