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
  12 #define UNSETVALUE -1
  13 #define TIMEOUTSEC 5000
  14
  15 Problem::Problem(const char *_problem) : result(UNSETVALUE) {
  16         uint len = strlen(_problem);
  17         problem = (char *) ourmalloc(len + 1);
  18         memcpy(problem, _problem, len + 1);
  19 }
  20
  21 Problem::~Problem() {
  22         ourfree(problem);
  23 }
  24
  25 void TunerRecord::setTime(Problem *problem, long long time) {
  26         timetaken.put(problem, time);
  27 }
  28
  29 long long TunerRecord::getTime(Problem *problem) {
  30         if (timetaken.contains(problem))
  31                 return timetaken.get(problem);
  32         else return -1;
  33 }
  34
  35 TunerRecord *TunerRecord::changeTuner(SearchTuner *_newtuner) {
  36         TunerRecord *tr = new TunerRecord(_newtuner);
  37         for (uint i = 0; i < problems.getSize(); i++) {
  38                 tr->problems.push(problems.get(i));
  39         }
  40         return tr;
  41 }
  42
  43 MultiTuner::MultiTuner(uint _budget, uint _rounds, uint _timeout) :
  44         budget(_budget), rounds(_rounds), timeout(_timeout), execnum(0) {
  45 }
  46
  47 MultiTuner::~MultiTuner() {
  48         for (uint i = 0; i < problems.getSize(); i++)
  49                 ourfree(problems.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         tuners.push(new TunerRecord(tuner));
  58 }
  59
  60 long long MultiTuner::evaluate(Problem *problem, SearchTuner *tuner) {
  61         char buffer[512];
  62         //Write out the tuner
  63         snprintf(buffer, sizeof(buffer), "tuner%u", execnum);
  64         tuner->serialize(buffer);
  65
  66         //Do run
  67         snprintf(buffer, sizeof(buffer), "deserializerun %s %u tuner%u result%s%u > log%u", problem->getProblem(), timeout, execnum, problem->getProblem(), execnum, execnum);
  68         int status = system(buffer);
  69
  70         long long metric = -1;
  71         int sat = IS_INDETER;
  72         if (status == 0) {
  73                 //Read data in from results file
  74                 snprintf(buffer, sizeof(buffer), "result%s%u", problem->getProblem(), execnum);
  75
  76                 ifstream myfile;
  77                 myfile.open (buffer, ios::in);
  78
  79
  80                 if (myfile.is_open()) {
  81                         myfile >> metric;
  82                         myfile >> sat;
  83                         myfile.close();
  84                 }
  85         }
  86         //Increment execution count
  87         execnum++;
  88
  89         if (problem->result == UNSETVALUE && sat != IS_INDETER) {
  90                 problem->result = sat;
  91         } else if (problem->result != sat && sat != IS_INDETER) {
  92                 model_print("******** Result has changed ********\n");
  93         }
  94         return metric;
  95 }
  96
  97 void MultiTuner::tuneComp() {
  98         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
  99         for (uint i = 0; i < problems.getSize(); i++) {
 100                 Problem *problem = problems.get(i);
 101
 102
 103         }
 104
 105 }
 106
 107 void MultiTuner::mapProblemsToTuners(Vector<TunerRecord *> *tunerV) {
 108         for (uint i = 0; i < problems.getSize(); i++) {
 109                 Problem *problem = problems.get(i);
 110                 TunerRecord *bestTuner = NULL;
 111                 long long bestscore = 0;
 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 ((bestTuner == NULL && metric != -1) ||
 121                                         (metric < bestscore && metric != -1)) {
 122                                 bestTuner = tuner;
 123                                 bestscore = metric;
 124                         }
 125                 }
 126                 if (bestTuner != NULL)
 127                         bestTuner->problems.push(problem);
 128         }
 129 }
 130
 131 void clearVector(Vector<TunerRecord *> *tunerV) {
 132         for (uint j = 0; j < tunerV->getSize(); j++) {
 133                 TunerRecord *tuner = tunerV->get(j);
 134                 tuner->problems.clear();
 135         }
 136 }
 137
 138 void MultiTuner::tuneK() {
 139         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 140         for (uint i = 0; i < rounds; i++) {
 141                 clearVector(tunerV);
 142                 mapProblemsToTuners(tunerV);
 143                 improveTuners(tunerV);
 144         }
 145         model_print("Best tuners\n");
 146         for (uint j = 0; j < tunerV->getSize(); j++) {
 147                 TunerRecord *tuner = tunerV->get(j);
 148                 char buffer[256];
 149                 sprintf(buffer, "tuner%u.conf", j);
 150                 tuner->getTuner()->serialize(buffer);
 151                 tuner->getTuner()->print();
 152         }
 153         delete tunerV;
 154 }
 155
 156 void MultiTuner::improveTuners(Vector<TunerRecord *> *tunerV) {
 157         for (uint j = 0; j < tunerV->getSize(); j++) {
 158                 TunerRecord *tuner = tunerV->get(j);
 159                 TunerRecord *newtuner = tune(tuner);
 160                 tunerV->set(j, newtuner);
 161         }
 162 }
 163
 164 double MultiTuner::evaluateAll(TunerRecord *tuner) {
 165         double product = 1;
 166         for (uint i = 0; i < tuner->problems.getSize(); i++) {
 167                 Problem *problem = tuner->problems.get(i);
 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
 175                 double score = metric;
 176                 product *= score;
 177         }
 178         return pow(product, 1 / ((double)tuner->problems.getSize()));
 179 }
 180
 181 SearchTuner *MultiTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
 182         SearchTuner *newTuner = oldTuner->copyUsed();
 183         uint numSettings = oldTuner->getSize();
 184         uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
 185         if (settingsToMutate < 1)
 186                 settingsToMutate = 1;
 187         model_print("Mutating %u settings\n", settingsToMutate);
 188         while (settingsToMutate-- != 0) {
 189                 newTuner->randomMutate();
 190         }
 191         return newTuner;
 192 }
 193
 194 TunerRecord *MultiTuner::tune(TunerRecord *tuner) {
 195         TunerRecord *bestTuner = NULL;
 196         double bestScore = DBL_MAX;
 197
 198         TunerRecord *oldTuner = tuner;
 199         double base_temperature = evaluateAll(oldTuner);
 200         double oldScore = base_temperature;
 201
 202         for (uint i = 0; i < budget; i++) {
 203                 SearchTuner *tmpTuner = mutateTuner(oldTuner->getTuner(), i);
 204                 TunerRecord *newTuner = oldTuner->changeTuner(tmpTuner);
 205                 double newScore = evaluateAll(newTuner);
 206                 newTuner->tuner->printUsed();
 207                 model_print("Received score %f\n", newScore);
 208                 double scoreDiff = newScore - oldScore; //smaller is better
 209                 if (newScore < bestScore) {
 210                         bestScore = newScore;
 211                         bestTuner = newTuner;
 212                 }
 213
 214                 double acceptanceP;
 215                 if (scoreDiff < 0) {
 216                         acceptanceP = 1;
 217                 } else {
 218                         double currTemp = base_temperature * (((double)budget - i) / budget);
 219                         acceptanceP = exp(-scoreDiff / currTemp);
 220                 }
 221                 double ran = ((double)random()) / RAND_MAX;
 222                 if (ran <= acceptanceP) {
 223                         oldScore = newScore;
 224                         oldTuner = newTuner;
 225                 }
 226         }
 227
 228         return bestTuner;
 229 }
 230