1 | /* |
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2 | Copyright (C) 2007, Lou Hafer, International Business Machines Corporation |
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3 | and others. All Rights Reserved. |
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4 | |
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5 | This file is part of cbc-generic. |
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6 | */ |
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7 | |
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8 | /* |
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9 | This file contains routines related to handling Osi solvers. The technique |
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10 | is to maintain a map of OsiSolverInterface objects as prototypes of the |
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11 | available solvers. |
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12 | */ |
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13 | |
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14 | #include "CbcConfig.h" |
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15 | #include "CoinPragma.hpp" |
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16 | |
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17 | #include "OsiSolverInterface.hpp" |
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18 | |
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19 | /* |
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20 | Include class definitions for the solvers that are available. If |
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21 | CBC_DEFAULT_SOLVER is not defined in CbcConfig.h, set it to the first |
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22 | available solver. |
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23 | |
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24 | NOTE: Processing of keyword parameters is made case-independent by forcing |
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25 | lower case comparison. Maps, on the other hand, are case-sensitive. |
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26 | The solver names given here must contain only lower case letters and |
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27 | must match the keywords used when defining the keywords for the |
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28 | solver parameter. |
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29 | */ |
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30 | |
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31 | #ifdef COIN_HAS_CLP |
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32 | # include "OsiClpSolverInterface.hpp" |
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33 | # ifndef CBC_DEFAULT_SOLVER |
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34 | # define CBC_DEFAULT_SOLVER "clp" |
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35 | # endif |
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36 | #endif |
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37 | |
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38 | #ifdef COIN_HAS_DYLP |
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39 | # include "OsiDylpSolverInterface.hpp" |
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40 | # ifndef CBC_DEFAULT_SOLVER |
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41 | # define CBC_DEFAULT_SOLVER "dylp" |
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42 | # endif |
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43 | #endif |
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44 | |
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45 | #ifdef COIN_HAS_GLPK |
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46 | # include "OsiGlpkSolverInterface.hpp" |
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47 | # ifndef CBC_DEFAULT_SOLVER |
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48 | # define CBC_DEFAULT_SOLVER "glpk" |
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49 | # endif |
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50 | #endif |
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51 | |
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52 | #include "CoinParam.hpp" |
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53 | |
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54 | #include "CbcModel.hpp" |
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55 | #include "CbcGenCtlBlk.hpp" |
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56 | |
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57 | #include "CbcGenParam.hpp" |
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58 | #include "CbcGenCbcParam.hpp" |
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59 | #include "CbcGenOsiParam.hpp" |
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60 | |
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61 | /* |
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62 | Unnamed local namespace to hide the data structures used to maintain the |
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63 | vector of OsiSolverInterface objects. |
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64 | */ |
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65 | |
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66 | namespace { |
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67 | |
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68 | /* |
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69 | Data types for a vector of OsiSolverInterface objects. |
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70 | */ |
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71 | typedef std::map<std::string,OsiSolverInterface*> solverMap_t ; |
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72 | typedef solverMap_t::const_iterator solverMapIter_t ; |
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73 | |
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74 | /* |
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75 | The solver map. |
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76 | */ |
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77 | |
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78 | solverMap_t solvers ; |
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79 | |
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80 | } // end unnamed local namespace |
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81 | |
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82 | |
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83 | namespace CbcGenSolvers { |
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84 | |
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85 | /* |
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86 | Create a vector of solver prototypes and establish a default solver. |
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87 | |
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88 | Creating multiple solvers is moderately expensive; if you're not interested |
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89 | in experimenting with solvers other than clp, you're likely better off just |
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90 | working with the cbc main program (CoinSolve.cpp). |
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91 | |
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92 | The businesss with CBC_DEFAULT_SOLVER will select the first available |
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93 | solver as the default, unless overridden at compile time. |
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94 | |
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95 | */ |
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96 | |
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97 | OsiSolverInterface *setupSolvers () |
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98 | |
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99 | { |
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100 | /* |
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101 | Populate the vector of OsiSolverInterface objects. |
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102 | */ |
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103 | # ifdef COIN_HAS_CLP |
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104 | solvers["clp"] = new OsiClpSolverInterface ; |
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105 | # endif |
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106 | # ifdef COIN_HAS_DYLP |
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107 | solvers["dylp"] = new OsiDylpSolverInterface ; |
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108 | # endif |
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109 | # ifdef COIN_HAS_GLPK |
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110 | solvers["glpk"] = new OsiGlpkSolverInterface ; |
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111 | # endif |
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112 | /* |
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113 | Set the standard default values in each solver. |
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114 | */ |
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115 | for (solverMapIter_t solverIter = solvers.begin() ; |
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116 | solverIter != solvers.end() ; |
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117 | solverIter++) |
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118 | { OsiSolverInterface *osi = solverIter->second ; |
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119 | osi->messageHandler()->setLogLevel(0) ; |
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120 | CbcOsiParamUtils::setOsiSolverInterfaceDefaults(osi) ; } |
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121 | /* |
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122 | If we don't have a default solver, we're deeply confused. |
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123 | */ |
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124 | OsiSolverInterface *dflt_solver = solvers[CBC_DEFAULT_SOLVER] ; |
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125 | if (dflt_solver) |
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126 | { std::cout << "Default solver is " << CBC_DEFAULT_SOLVER << std::endl ; } |
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127 | else |
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128 | { std::cerr << "No solvers!" << std::endl ; } |
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129 | |
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130 | return (dflt_solver) ; |
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131 | } |
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132 | |
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133 | |
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134 | /* |
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135 | Cleanup routine to delete the vector of OsiSolverInterface objects. |
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136 | */ |
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137 | |
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138 | void deleteSolvers () |
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139 | { |
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140 | for (solverMapIter_t solverIter = solvers.begin() ; |
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141 | solverIter != solvers.end() ; |
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142 | solverIter++) |
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143 | { if (solverIter->second) delete solverIter->second ; } |
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144 | } |
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145 | |
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146 | /* |
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147 | The `push' routine for the solver parameter. |
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148 | |
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149 | The basic operation is to clone the requested solver and assign it to the |
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150 | current CbcModel object. |
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151 | */ |
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152 | |
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153 | int changeCbcSolver (CoinParam *param) |
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154 | |
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155 | { assert (param != 0) ; |
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156 | CbcGenParam *genParam = dynamic_cast<CbcGenParam *>(param) ; |
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157 | assert (genParam != 0) ; |
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158 | CbcGenCtlBlk *ctlBlk = genParam->obj() ; |
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159 | assert (ctlBlk != 0) ; |
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160 | /* |
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161 | Setup to return nonfatal/fatal error (1/-1) by default. |
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162 | */ |
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163 | int retval ; |
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164 | if (CoinParamUtils::isInteractive()) |
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165 | { retval = 1 ; } |
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166 | else |
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167 | { retval = -1 ; } |
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168 | /* |
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169 | Try to locate the solver specified by the user. |
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170 | */ |
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171 | const std::string solverName = genParam->kwdVal() ; |
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172 | OsiSolverInterface *protoOsi = solvers[solverName] ; |
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173 | if (protoOsi == 0) |
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174 | { std::cerr |
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175 | << "Can't find solver \"" << solverName |
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176 | << "\" in the solvers vector." << std::endl ; |
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177 | return (retval) ; } |
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178 | ctlBlk->dfltSolver_ = protoOsi ; |
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179 | /* |
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180 | We have a solver. |
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181 | */ |
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182 | CbcModel *model = ctlBlk->model_ ; |
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183 | assert (model != 0) ; |
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184 | OsiSolverInterface *newOsi = protoOsi->clone() ; |
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185 | model->assignSolver(newOsi) ; |
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186 | |
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187 | return (0) ; } |
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188 | |
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189 | |
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190 | /* |
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191 | This routine sets up a solver parameter object. It doesn't initialise the |
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192 | object being acted upon (a CbcGenCtlBlk); that's done back in the calling |
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193 | routine where we're setting up the cbc-generic parameter vector. |
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194 | */ |
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195 | |
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196 | void setupSolverParam (CbcGenParam &solverParam) |
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197 | |
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198 | { |
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199 | /* |
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200 | Basic setup: parameter type, name, parameter code. |
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201 | */ |
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202 | solverParam.setType(CoinParam::coinParamKwd) ; |
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203 | solverParam.setName("solver") ; |
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204 | solverParam.setParamCode(CbcGenParam::SOLVER) ; |
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205 | /* |
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206 | Add the solvers and set the default value. |
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207 | */ |
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208 | for (solverMapIter_t solverIter = solvers.begin() ; |
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209 | solverIter != solvers.end() ; |
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210 | solverIter++) |
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211 | { solverParam.appendKwd(solverIter->first) ; } |
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212 | solverParam.setKwdVal(CBC_DEFAULT_SOLVER) ; |
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213 | solverParam.setDisplay(true) ; |
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214 | solverParam.setPushFunc(changeCbcSolver) ; |
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215 | /* |
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216 | And add the help strings. |
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217 | */ |
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218 | solverParam.setShortHelp("Specify underlying LP solver") ; |
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219 | solverParam.setLongHelp( |
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220 | "Select the underlying LP solver that will be used to solve the continuous relaxations of subproblems." |
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221 | ) ; |
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222 | } |
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223 | |
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224 | } // end namespace CbcGenSolvers |
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225 | |
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