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