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", problem->getProblem(), timeout, execnum, problem->getProblem(), 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 double MultiTuner::evaluateAll(SearchTuner *tuner) {
  80         double product = 1;
  81         for (uint i = 0; i < problems.getSize(); i++) {
  82                 Problem *problem = problems.get(i);
  83                 double score = evaluate(problem, tuner);
  84                 product *= score;
  85         }
  86         return pow(product, 1 / ((double)problems.getSize()));
  87 }
  88
  89 SearchTuner *MultiTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
  90         SearchTuner *newTuner = oldTuner->copyUsed();
  91         uint numSettings = oldTuner->getSize();
  92         uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
  93         if (settingsToMutate < 1)
  94                 settingsToMutate = 1;
  95         model_print("Mutating %u settings\n", settingsToMutate);
  96         while (settingsToMutate-- != 0) {
  97                 newTuner->randomMutate();
  98         }
  99         return newTuner;
 100 }
 101
 102 void MultiTuner::tune() {
 103         SearchTuner *bestTuner = NULL;
 104         double bestScore = DBL_MAX;
 105
 106         SearchTuner *oldTuner = new SearchTuner();
 107         double base_temperature = evaluateAll(oldTuner);
 108         double oldScore = base_temperature;
 109
 110         for (uint i = 0; i < budget; i++) {
 111                 SearchTuner *newTuner = mutateTuner(oldTuner, i);
 112                 double newScore = evaluateAll(newTuner);
 113                 newTuner->printUsed();
 114                 model_print("Received score %f\n", newScore);
 115                 double scoreDiff = newScore - oldScore; //smaller is better
 116                 if (newScore < bestScore) {
 117                         if (bestTuner != NULL)
 118                                 delete bestTuner;
 119                         bestScore = newScore;
 120                         bestTuner = newTuner->copyUsed();
 121                 }
 122
 123                 double acceptanceP;
 124                 if (scoreDiff < 0) {
 125                         acceptanceP = 1;
 126                 } else {
 127                         double currTemp = base_temperature * (((double)budget - i) / budget);
 128                         acceptanceP = exp(-scoreDiff / currTemp);
 129                 }
 130                 double ran = ((double)random()) / RAND_MAX;
 131                 if (ran <= acceptanceP) {
 132                         delete oldTuner;
 133                         oldScore = newScore;
 134                         oldTuner = newTuner;
 135                 } else {
 136                         delete newTuner;
 137                 }
 138         }
 139         model_print("Best tuner:\n");
 140         bestTuner->print();
 141         model_print("Received score %f\n", bestScore);
 142         if (bestTuner != NULL)
 143                 delete bestTuner;
 144         delete oldTuner;
 145 }