1 | // $Id: sample2.cpp 1660 2011-06-09 13:09:23Z stefan $ |
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2 | // Copyright (C) 2002, International Business Machines |
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3 | // Corporation and others. All Rights Reserved. |
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4 | // This code is licensed under the terms of the Eclipse Public License (EPL). |
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5 | |
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6 | #include <cassert> |
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7 | #include <iomanip> |
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8 | |
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9 | #include "CoinPragma.hpp" |
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10 | |
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11 | // For Branch and bound |
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12 | #include "OsiSolverInterface.hpp" |
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13 | #include "CbcModel.hpp" |
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14 | #include "CbcBranchUser.hpp" |
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15 | #include "CbcCompareUser.hpp" |
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16 | #include "CbcCutGenerator.hpp" |
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17 | #include "CbcStrategy.hpp" |
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18 | #include "CbcHeuristicLocal.hpp" |
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19 | #include "OsiClpSolverInterface.hpp" |
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20 | |
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21 | // Cuts |
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22 | |
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23 | #include "CglGomory.hpp" |
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24 | #include "CglProbing.hpp" |
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25 | #include "CglKnapsackCover.hpp" |
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26 | #include "CglRedSplit.hpp" |
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27 | #include "CglClique.hpp" |
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28 | #include "CglFlowCover.hpp" |
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29 | #include "CglMixedIntegerRounding2.hpp" |
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30 | // Preprocessing |
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31 | #include "CglPreProcess.hpp" |
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32 | |
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33 | // Heuristics |
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34 | |
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35 | #include "CbcHeuristic.hpp" |
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36 | |
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37 | #include "CoinTime.hpp" |
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38 | |
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39 | //############################################################################# |
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40 | |
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41 | |
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42 | /************************************************************************ |
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43 | |
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44 | This main program reads in an integer model from an mps file. |
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45 | |
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46 | It then sets up some Cgl cut generators and calls branch and cut. |
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47 | |
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48 | Branching is simple binary branching on integer variables. |
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49 | |
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50 | Node selection is depth first until first solution is found and then |
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51 | based on objective and number of unsatisfied integer variables. |
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52 | In this example the functionality is the same as default but it is |
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53 | a user comparison function. |
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54 | |
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55 | Variable branching selection is on maximum minimum-of-up-down change |
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56 | after strong branching on 5 variables closest to 0.5. |
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57 | |
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58 | A simple rounding heuristic is used. |
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59 | |
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60 | Preprocessing may be selected in two ways - the second is preferred now |
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61 | |
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62 | ************************************************************************/ |
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63 | #define PREPROCESS 2 |
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64 | |
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65 | int main (int argc, const char *argv[]) |
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66 | { |
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67 | |
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68 | // Define your favorite OsiSolver |
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69 | |
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70 | OsiClpSolverInterface solver1; |
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71 | |
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72 | // Read in model using argv[1] |
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73 | // and assert that it is a clean model |
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74 | std::string dirsep(1,CoinFindDirSeparator()); |
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75 | std::string mpsFileName; |
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76 | # if defined(SAMPLEDIR) |
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77 | mpsFileName = SAMPLEDIR ; |
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78 | mpsFileName += dirsep+"p0033.mps"; |
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79 | # else |
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80 | if (argc < 2) { |
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81 | fprintf(stderr, "Do not know where to find sample MPS files.\n"); |
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82 | exit(1); |
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83 | } |
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84 | # endif |
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85 | if (argc>=2) mpsFileName = argv[1]; |
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86 | int numMpsReadErrors = solver1.readMps(mpsFileName.c_str(),""); |
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87 | assert(numMpsReadErrors==0); |
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88 | double time1 = CoinCpuTime(); |
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89 | |
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90 | /* Options are: |
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91 | preprocess to do preprocessing |
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92 | time in minutes |
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93 | if 2 parameters and numeric taken as time |
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94 | */ |
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95 | bool preProcess=false; |
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96 | double minutes=-1.0; |
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97 | int nGoodParam=0; |
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98 | for (int iParam=2; iParam<argc;iParam++) { |
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99 | if (!strcmp(argv[iParam],"preprocess")) { |
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100 | preProcess=true; |
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101 | nGoodParam++; |
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102 | } else if (!strcmp(argv[iParam],"time")) { |
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103 | if (iParam+1<argc&&isdigit(argv[iParam+1][0])) { |
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104 | minutes=atof(argv[iParam+1]); |
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105 | if (minutes>=0.0) { |
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106 | nGoodParam+=2; |
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107 | iParam++; // skip time |
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108 | } |
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109 | } |
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110 | } |
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111 | } |
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112 | if (nGoodParam==0&&argc==3&&isdigit(argv[2][0])) { |
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113 | // If time is given then stop after that number of minutes |
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114 | minutes = atof(argv[2]); |
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115 | if (minutes>=0.0) |
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116 | nGoodParam=1; |
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117 | } |
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118 | if (nGoodParam!=argc-2&&argc>=2) { |
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119 | printf("Usage <file> [preprocess] [time <minutes>] or <file> <minutes>\n"); |
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120 | exit(1); |
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121 | } |
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122 | solver1.initialSolve(); |
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123 | // Reduce printout |
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124 | solver1.setHintParam(OsiDoReducePrint,true,OsiHintTry); |
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125 | // See if we want preprocessing |
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126 | OsiSolverInterface * solver2=&solver1; |
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127 | #if PREPROCESS==1 |
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128 | CglPreProcess process; |
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129 | if (preProcess) { |
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130 | /* Do not try and produce equality cliques and |
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131 | do up to 5 passes */ |
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132 | solver2 = process.preProcess(solver1,false,5); |
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133 | if (!solver2) { |
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134 | printf("Pre-processing says infeasible\n"); |
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135 | exit(2); |
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136 | } |
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137 | solver2->resolve(); |
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138 | } |
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139 | #endif |
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140 | CbcModel model(*solver2); |
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141 | model.solver()->setHintParam(OsiDoReducePrint,true,OsiHintTry); |
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142 | // Set up some cut generators and defaults |
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143 | // Probing first as gets tight bounds on continuous |
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144 | |
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145 | CglProbing generator1; |
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146 | generator1.setUsingObjective(true); |
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147 | generator1.setMaxPass(1); |
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148 | generator1.setMaxPassRoot(5); |
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149 | // Number of unsatisfied variables to look at |
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150 | generator1.setMaxProbe(10); |
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151 | generator1.setMaxProbeRoot(1000); |
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152 | // How far to follow the consequences |
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153 | generator1.setMaxLook(50); |
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154 | generator1.setMaxLookRoot(500); |
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155 | // Only look at rows with fewer than this number of elements |
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156 | generator1.setMaxElements(200); |
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157 | generator1.setRowCuts(3); |
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158 | |
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159 | CglGomory generator2; |
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160 | // try larger limit |
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161 | generator2.setLimit(300); |
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162 | |
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163 | CglKnapsackCover generator3; |
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164 | |
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165 | CglRedSplit generator4; |
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166 | // try larger limit |
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167 | generator4.setLimit(200); |
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168 | |
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169 | CglClique generator5; |
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170 | generator5.setStarCliqueReport(false); |
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171 | generator5.setRowCliqueReport(false); |
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172 | |
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173 | CglMixedIntegerRounding2 mixedGen; |
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174 | CglFlowCover flowGen; |
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175 | |
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176 | // Add in generators |
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177 | // Experiment with -1 and -99 etc |
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178 | model.addCutGenerator(&generator1,-1,"Probing"); |
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179 | model.addCutGenerator(&generator2,-1,"Gomory"); |
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180 | model.addCutGenerator(&generator3,-1,"Knapsack"); |
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181 | // model.addCutGenerator(&generator4,-1,"RedSplit"); |
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182 | model.addCutGenerator(&generator5,-1,"Clique"); |
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183 | model.addCutGenerator(&flowGen,-1,"FlowCover"); |
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184 | model.addCutGenerator(&mixedGen,-1,"MixedIntegerRounding"); |
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185 | // Say we want timings |
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186 | int numberGenerators = model.numberCutGenerators(); |
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187 | int iGenerator; |
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188 | for (iGenerator=0;iGenerator<numberGenerators;iGenerator++) { |
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189 | CbcCutGenerator * generator = model.cutGenerator(iGenerator); |
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190 | generator->setTiming(true); |
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191 | } |
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192 | OsiClpSolverInterface * osiclp = dynamic_cast< OsiClpSolverInterface*> (model.solver()); |
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193 | // go faster stripes |
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194 | if (osiclp) { |
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195 | // Turn this off if you get problems |
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196 | // Used to be automatically set |
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197 | osiclp->setSpecialOptions(128); |
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198 | if(osiclp->getNumRows()<300&&osiclp->getNumCols()<500) { |
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199 | //osiclp->setupForRepeatedUse(2,0); |
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200 | osiclp->setupForRepeatedUse(0,0); |
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201 | } |
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202 | } |
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203 | // Uncommenting this should switch off all CBC messages |
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204 | // model.messagesPointer()->setDetailMessages(10,10000,NULL); |
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205 | // Allow rounding heuristic |
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206 | |
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207 | CbcRounding heuristic1(model); |
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208 | model.addHeuristic(&heuristic1); |
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209 | |
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210 | // And local search when new solution found |
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211 | |
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212 | CbcHeuristicLocal heuristic2(model); |
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213 | model.addHeuristic(&heuristic2); |
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214 | |
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215 | // Redundant definition of default branching (as Default == User) |
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216 | CbcBranchUserDecision branch; |
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217 | model.setBranchingMethod(&branch); |
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218 | |
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219 | // Definition of node choice |
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220 | CbcCompareUser compare; |
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221 | model.setNodeComparison(compare); |
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222 | |
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223 | // Do initial solve to continuous |
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224 | model.initialSolve(); |
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225 | |
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226 | // Could tune more |
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227 | double objValue = model.solver()->getObjSense()*model.solver()->getObjValue(); |
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228 | double minimumDropA=CoinMin(1.0,fabs(objValue)*1.0e-3+1.0e-4); |
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229 | double minimumDrop= fabs(objValue)*1.0e-4+1.0e-4; |
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230 | printf("min drop %g (A %g)\n",minimumDrop,minimumDropA); |
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231 | model.setMinimumDrop(minimumDrop); |
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232 | |
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233 | if (model.getNumCols()<500) |
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234 | model.setMaximumCutPassesAtRoot(-100); // always do 100 if possible |
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235 | else if (model.getNumCols()<5000) |
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236 | model.setMaximumCutPassesAtRoot(100); // use minimum drop |
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237 | else |
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238 | model.setMaximumCutPassesAtRoot(20); |
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239 | model.setMaximumCutPasses(10); |
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240 | //model.setMaximumCutPasses(2); |
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241 | |
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242 | // Switch off strong branching if wanted |
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243 | // model.setNumberStrong(0); |
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244 | // Do more strong branching if small |
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245 | if (model.getNumCols()<5000) |
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246 | model.setNumberStrong(10); |
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247 | model.setNumberStrong(20); |
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248 | //model.setNumberStrong(5); |
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249 | model.setNumberBeforeTrust(5); |
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250 | |
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251 | model.solver()->setIntParam(OsiMaxNumIterationHotStart,100); |
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252 | |
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253 | // If time is given then stop after that number of minutes |
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254 | if (minutes>=0.0) { |
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255 | std::cout<<"Stopping after "<<minutes<<" minutes"<<std::endl; |
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256 | model.setDblParam(CbcModel::CbcMaximumSeconds,60.0*minutes); |
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257 | } |
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258 | // Switch off most output |
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259 | if (model.getNumCols()<3000) { |
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260 | model.messageHandler()->setLogLevel(1); |
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261 | //model.solver()->messageHandler()->setLogLevel(0); |
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262 | } else { |
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263 | model.messageHandler()->setLogLevel(2); |
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264 | model.solver()->messageHandler()->setLogLevel(1); |
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265 | } |
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266 | //model.messageHandler()->setLogLevel(2); |
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267 | //model.solver()->messageHandler()->setLogLevel(2); |
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268 | //model.setPrintFrequency(50); |
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269 | //#define DEBUG_CUTS |
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270 | #ifdef DEBUG_CUTS |
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271 | // Set up debugger by name (only if no preprocesing) |
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272 | if (!preProcess) { |
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273 | std::string problemName ; |
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274 | model.solver()->getStrParam(OsiProbName,problemName) ; |
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275 | model.solver()->activateRowCutDebugger(problemName.c_str()) ; |
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276 | } |
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277 | #endif |
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278 | #if PREPROCESS==2 |
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279 | // Default strategy will leave cut generators as they exist already |
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280 | // so cutsOnlyAtRoot (1) ignored |
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281 | // numberStrong (2) is 5 (default) |
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282 | // numberBeforeTrust (3) is 5 (default is 0) |
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283 | // printLevel (4) defaults (0) |
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284 | CbcStrategyDefault strategy(true,5,5); |
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285 | // Set up pre-processing to find sos if wanted |
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286 | if (preProcess) |
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287 | strategy.setupPreProcessing(2); |
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288 | model.setStrategy(strategy); |
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289 | #endif |
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290 | // Do complete search |
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291 | |
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292 | model.branchAndBound(); |
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293 | |
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294 | std::cout<<mpsFileName<<" took "<<CoinCpuTime()-time1<<" seconds, " |
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295 | <<model.getNodeCount()<<" nodes with objective " |
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296 | <<model.getObjValue() |
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297 | <<(!model.status() ? " Finished" : " Not finished") |
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298 | <<std::endl; |
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299 | |
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300 | // Print more statistics |
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301 | std::cout<<"Cuts at root node changed objective from "<<model.getContinuousObjective() |
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302 | <<" to "<<model.rootObjectiveAfterCuts()<<std::endl; |
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303 | |
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304 | for (iGenerator=0;iGenerator<numberGenerators;iGenerator++) { |
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305 | CbcCutGenerator * generator = model.cutGenerator(iGenerator); |
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306 | std::cout<<generator->cutGeneratorName()<<" was tried " |
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307 | <<generator->numberTimesEntered()<<" times and created " |
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308 | <<generator->numberCutsInTotal()<<" cuts of which " |
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309 | <<generator->numberCutsActive()<<" were active after adding rounds of cuts"; |
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310 | if (generator->timing()) |
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311 | std::cout<<" ( "<<generator->timeInCutGenerator()<<" seconds)"<<std::endl; |
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312 | else |
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313 | std::cout<<std::endl; |
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314 | } |
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315 | // Print solution if finished - we can't get names from Osi! - so get from OsiClp |
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316 | |
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317 | if (model.getMinimizationObjValue()<1.0e50) { |
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318 | #if PREPROCESS==1 |
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319 | // post process |
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320 | OsiSolverInterface * solver; |
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321 | if (preProcess) { |
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322 | process.postProcess(*model.solver()); |
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323 | // Solution now back in solver1 |
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324 | solver = & solver1; |
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325 | } else { |
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326 | solver = model.solver(); |
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327 | } |
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328 | #else |
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329 | OsiSolverInterface * solver = model.solver(); |
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330 | #endif |
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331 | int numberColumns = solver->getNumCols(); |
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332 | |
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333 | const double * solution = solver->getColSolution(); |
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334 | |
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335 | // Get names from solver1 (as OsiSolverInterface may lose) |
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336 | std::vector<std::string> columnNames = *solver1.getModelPtr()->columnNames(); |
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337 | |
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338 | int iColumn; |
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339 | std::cout<<std::setiosflags(std::ios::fixed|std::ios::showpoint)<<std::setw(14); |
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340 | |
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341 | std::cout<<"--------------------------------------"<<std::endl; |
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342 | for (iColumn=0;iColumn<numberColumns;iColumn++) { |
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343 | double value=solution[iColumn]; |
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344 | if (fabs(value)>1.0e-7&&solver->isInteger(iColumn)) |
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345 | std::cout<<std::setw(6)<<iColumn<<" " |
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346 | <<columnNames[iColumn]<<" " |
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347 | <<value<<std::endl; |
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348 | } |
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349 | std::cout<<"--------------------------------------"<<std::endl; |
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350 | |
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351 | std::cout<<std::resetiosflags(std::ios::fixed|std::ios::showpoint|std::ios::scientific); |
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352 | } |
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353 | return 0; |
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354 | } |
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