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 MultiTuner::MultiTuner(uint _budget, uint _timeout) :
  26         budget(_budget), timeout(_timeout), execnum(0) {
  27 }
  28
  29 MultiTuner::~MultiTuner() {
  30         for (uint i = 0; i < problems.getSize(); i++)
  31                 ourfree(problems.get(i));
  32 }
  33
  34 void MultiTuner::addProblem(const char *filename) {
  35         problems.push(new Problem(filename));
  36 }
  37
  38 void MultiTuner::addTuner(SearchTuner *tuner) {
  39         tuners.push(new TunerRecord(tuner));
  40 }
  41
  42 long long MultiTuner::evaluate(Problem *problem, SearchTuner *tuner) {
  43         char buffer[512];
  44         //Write out the tuner
  45         snprintf(buffer, sizeof(buffer), "tuner%u", execnum);
  46         tuner->serialize(buffer);
  47
  48         //Do run
  49         snprintf(buffer, sizeof(buffer), "deserializerun %s %u tuner%u result%s%u > log%u", problem->getProblem(), timeout, execnum, problem->getProblem(), execnum, execnum);
  50         int status = system(buffer);
  51
  52         long long metric = -1;
  53         int sat = IS_INDETER;
  54         if (status == 0) {
  55                 //Read data in from results file
  56                 snprintf(buffer, sizeof(buffer), "result%s%u", problem->getProblem(), execnum);
  57
  58                 ifstream myfile;
  59                 myfile.open (buffer, ios::in);
  60
  61
  62                 if (myfile.is_open()) {
  63                         myfile >> metric;
  64                         myfile >> sat;
  65                         myfile.close();
  66                 }
  67         }
  68         //Increment execution count
  69         execnum++;
  70
  71         if (problem->result == UNSETVALUE && sat != IS_INDETER) {
  72                 problem->result = sat;
  73         } else if (problem->result != sat && sat != IS_INDETER) {
  74                 model_print("******** Result has changed ********\n");
  75         }
  76         return metric;
  77 }
  78
  79 void MultiTuner::mapProblemsToTuners(Vector<TunerRecord *> *tunerV) {
  80         for (uint i = 0; i < problems.getSize(); i++) {
  81                 Problem *problem = problems.get(i);
  82                 TunerRecord *bestTuner = NULL;
  83                 long long bestscore = 0;
  84                 for (uint j = 0; j < tunerV->getSize(); j++) {
  85                         TunerRecord *tuner = tunerV->get(j);
  86                         long long metric = evaluate(problem, tuner->getTuner());
  87                         if ((bestTuner == NULL && metric != -1) ||
  88                                         (metric < bestscore && metric != -1)) {
  89                                 bestTuner = tuner;
  90                                 bestscore = metric;
  91                         }
  92                 }
  93                 if (bestTuner != NULL)
  94                         bestTuner->problems.push(problem);
  95         }
  96 }
  97
  98 void clearVector(Vector<TunerRecord *> *tunerV) {
  99         for (uint j = 0; j < tunerV->getSize(); j++) {
 100                 TunerRecord *tuner = tunerV->get(j);
 101                 tuner->problems.clear();
 102         }
 103 }
 104
 105 void MultiTuner::tuneK() {
 106         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 107         while (true) {
 108                 clearVector(tunerV);
 109                 mapProblemsToTuners(tunerV);
 110                 improveTuners(tunerV);
 111         }
 112
 113         delete tunerV;
 114 }
 115
 116 void MultiTuner::improveTuners(Vector<TunerRecord *> *tunerV) {
 117         for (uint j = 0; j < tunerV->getSize(); j++) {
 118                 TunerRecord *tuner = tunerV->get(j);
 119                 SearchTuner *newtuner = tune(tuner->getTuner(), &tuner->problems);
 120         }
 121 }
 122
 123 double MultiTuner::evaluateAll(SearchTuner *tuner, Vector<Problem *> *tProblems) {
 124         double product = 1;
 125         for (uint i = 0; i < tProblems->getSize(); i++) {
 126                 Problem *problem = tProblems->get(i);
 127                 double score = evaluate(problem, tuner);
 128                 product *= score;
 129         }
 130         return pow(product, 1 / ((double)tProblems->getSize()));
 131 }
 132
 133 SearchTuner *MultiTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
 134         SearchTuner *newTuner = oldTuner->copyUsed();
 135         uint numSettings = oldTuner->getSize();
 136         uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
 137         if (settingsToMutate < 1)
 138                 settingsToMutate = 1;
 139         model_print("Mutating %u settings\n", settingsToMutate);
 140         while (settingsToMutate-- != 0) {
 141                 newTuner->randomMutate();
 142         }
 143         return newTuner;
 144 }
 145
 146 SearchTuner *MultiTuner::tune(SearchTuner *tuner, Vector<Problem *> *tProblems) {
 147         SearchTuner *bestTuner = NULL;
 148         double bestScore = DBL_MAX;
 149
 150         SearchTuner *oldTuner = tuner->copyUsed();
 151         double base_temperature = evaluateAll(oldTuner, tProblems);
 152         double oldScore = base_temperature;
 153
 154         for (uint i = 0; i < budget; i++) {
 155                 SearchTuner *newTuner = mutateTuner(oldTuner, i);
 156                 double newScore = evaluateAll(newTuner, tProblems);
 157                 newTuner->printUsed();
 158                 model_print("Received score %f\n", newScore);
 159                 double scoreDiff = newScore - oldScore; //smaller is better
 160                 if (newScore < bestScore) {
 161                         if (bestTuner != NULL)
 162                                 delete bestTuner;
 163                         bestScore = newScore;
 164                         bestTuner = newTuner->copyUsed();
 165                 }
 166
 167                 double acceptanceP;
 168                 if (scoreDiff < 0) {
 169                         acceptanceP = 1;
 170                 } else {
 171                         double currTemp = base_temperature * (((double)budget - i) / budget);
 172                         acceptanceP = exp(-scoreDiff / currTemp);
 173                 }
 174                 double ran = ((double)random()) / RAND_MAX;
 175                 if (ran <= acceptanceP) {
 176                         delete oldTuner;
 177                         oldScore = newScore;
 178                         oldTuner = newTuner;
 179                 } else {
 180                         delete newTuner;
 181                 }
 182         }
 183
 184         return bestTuner;
 185 }
 186