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
 103                 uint tSize = tunerV->getSize();
 104                 for (uint i = 0; i < tSize; i++) {
 105                         SearchTuner *tmpTuner = mutateTuner(tunerV->get(i)->getTuner(), b);
 106                         tunerV->push(new TunerRecord(tmpTuner));
 107                 }
 108
 109                 Hashtable<TunerRecord *, int, uint64_t> scores;
 110                 for (uint i = 0; i < problems.getSize(); i++) {
 111                         Problem *problem = problems.get(i);
 112                         Vector<TunerRecord *> places;
 113                         for (uint j = 0; j < tunerV->getSize(); j++) {
 114                                 TunerRecord *tuner = tunerV->get(j);
 115                                 long long metric = tuner->getTime(problem);
 116                                 if (metric == -1) {
 117                                         metric = evaluate(problem, tuner->getTuner());
 118                                         if (metric != -1)
 119                                                 tuner->setTime(problem, metric);
 120                                 }
 121                                 if (metric != -1) {
 122                                         uint k = 0;
 123                                         for (; k < places.getSize(); k++) {
 124                                                 if (metric < places.get(k)->getTime(problem))
 125                                                         break;
 126                                         }
 127                                         places.insertAt(k, tuner);
 128                                 }
 129                         }
 130                         int points = 4;
 131                         for (uint k = 0; k < places.getSize() && points; k++) {
 132                                 TunerRecord *tuner = places.get(k);
 133                                 points = points / 2;
 134                                 int currScore = 0;
 135                                 if (scores.contains(tuner))
 136                                         currScore = scores.get(tuner);
 137                                 currScore += points;
 138                                 scores.put(tuner, currScore);
 139                         }
 140                 }
 141                 Vector<TunerRecord *> ranking;
 142                 for (uint i = 0; i < tunerV->getSize(); i++) {
 143                         TunerRecord *tuner = tunerV->get(i);
 144                         int score = 0;
 145                         if (scores.contains(tuner))
 146                                 score = scores.get(tuner);
 147                         uint j = 0;
 148                         for (; j < ranking.getSize(); j++) {
 149                                 TunerRecord *t = ranking.get(j);
 150                                 int tscore = 0;
 151                                 if (scores.contains(t))
 152                                         tscore = scores.get(t);
 153                                 if (score > tscore)
 154                                         break;
 155                         }
 156                         ranking.insertAt(j, tuner);
 157                 }
 158         }
 159 }
 160
 161 void MultiTuner::mapProblemsToTuners(Vector<TunerRecord *> *tunerV) {
 162         for (uint i = 0; i < problems.getSize(); i++) {
 163                 Problem *problem = problems.get(i);
 164                 TunerRecord *bestTuner = NULL;
 165                 long long bestscore = 0;
 166                 for (uint j = 0; j < tunerV->getSize(); j++) {
 167                         TunerRecord *tuner = tunerV->get(j);
 168                         long long metric = tuner->getTime(problem);
 169                         if (metric == -1) {
 170                                 metric = evaluate(problem, tuner->getTuner());
 171                                 if (metric != -1)
 172                                         tuner->setTime(problem, metric);
 173                         }
 174                         if ((bestTuner == NULL && metric != -1) ||
 175                                         (metric < bestscore && metric != -1)) {
 176                                 bestTuner = tuner;
 177                                 bestscore = metric;
 178                         }
 179                 }
 180                 if (bestTuner != NULL)
 181                         bestTuner->problems.push(problem);
 182         }
 183 }
 184
 185 void clearVector(Vector<TunerRecord *> *tunerV) {
 186         for (uint j = 0; j < tunerV->getSize(); j++) {
 187                 TunerRecord *tuner = tunerV->get(j);
 188                 tuner->problems.clear();
 189         }
 190 }
 191
 192 void MultiTuner::tuneK() {
 193         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 194         for (uint i = 0; i < rounds; i++) {
 195                 clearVector(tunerV);
 196                 mapProblemsToTuners(tunerV);
 197                 improveTuners(tunerV);
 198         }
 199         model_print("Best tuners\n");
 200         for (uint j = 0; j < tunerV->getSize(); j++) {
 201                 TunerRecord *tuner = tunerV->get(j);
 202                 char buffer[256];
 203                 sprintf(buffer, "tuner%u.conf", j);
 204                 tuner->getTuner()->serialize(buffer);
 205                 tuner->getTuner()->print();
 206         }
 207         delete tunerV;
 208 }
 209
 210 void MultiTuner::improveTuners(Vector<TunerRecord *> *tunerV) {
 211         for (uint j = 0; j < tunerV->getSize(); j++) {
 212                 TunerRecord *tuner = tunerV->get(j);
 213                 TunerRecord *newtuner = tune(tuner);
 214                 tunerV->set(j, newtuner);
 215         }
 216 }
 217
 218 double MultiTuner::evaluateAll(TunerRecord *tuner) {
 219         double product = 1;
 220         for (uint i = 0; i < tuner->problems.getSize(); i++) {
 221                 Problem *problem = tuner->problems.get(i);
 222                 long long metric = tuner->getTime(problem);
 223                 if (metric == -1) {
 224                         metric = evaluate(problem, tuner->getTuner());
 225                         if (metric != -1)
 226                                 tuner->setTime(problem, metric);
 227                 }
 228
 229                 double score = metric;
 230                 product *= score;
 231         }
 232         return pow(product, 1 / ((double)tuner->problems.getSize()));
 233 }
 234
 235 SearchTuner *MultiTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
 236         SearchTuner *newTuner = oldTuner->copyUsed();
 237         uint numSettings = oldTuner->getSize();
 238         uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
 239         if (settingsToMutate < 1)
 240                 settingsToMutate = 1;
 241         model_print("Mutating %u settings\n", settingsToMutate);
 242         while (settingsToMutate-- != 0) {
 243                 newTuner->randomMutate();
 244         }
 245         return newTuner;
 246 }
 247
 248 TunerRecord *MultiTuner::tune(TunerRecord *tuner) {
 249         TunerRecord *bestTuner = NULL;
 250         double bestScore = DBL_MAX;
 251
 252         TunerRecord *oldTuner = tuner;
 253         double base_temperature = evaluateAll(oldTuner);
 254         double oldScore = base_temperature;
 255
 256         for (uint i = 0; i < budget; i++) {
 257                 SearchTuner *tmpTuner = mutateTuner(oldTuner->getTuner(), i);
 258                 TunerRecord *newTuner = oldTuner->changeTuner(tmpTuner);
 259                 allTuners.push(newTuner);
 260                 double newScore = evaluateAll(newTuner);
 261                 newTuner->tuner->printUsed();
 262                 model_print("Received score %f\n", newScore);
 263                 double scoreDiff = newScore - oldScore; //smaller is better
 264                 if (newScore < bestScore) {
 265                         bestScore = newScore;
 266                         bestTuner = newTuner;
 267                 }
 268
 269                 double acceptanceP;
 270                 if (scoreDiff < 0) {
 271                         acceptanceP = 1;
 272                 } else {
 273                         double currTemp = base_temperature * (((double)budget - i) / budget);
 274                         acceptanceP = exp(-scoreDiff / currTemp);
 275                 }
 276                 double ran = ((double)random()) / RAND_MAX;
 277                 if (ran <= acceptanceP) {
 278                         oldScore = newScore;
 279                         oldTuner = newTuner;
 280                 }
 281         }
 282
 283         return bestTuner;
 284 }
 285