1 | // $Id: CbcFollowOn.hpp 1899 2013-04-09 18:12:08Z forrest $ |
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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 | // Edwin 11/10/2009-- carved out of CbcBranchActual |
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7 | |
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8 | #ifndef CbcFollowOn_H |
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9 | #define CbcFollowOn_H |
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10 | |
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11 | #include "CbcBranchBase.hpp" |
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12 | #include "OsiRowCut.hpp" |
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13 | #include "CoinHelperFunctions.hpp" |
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14 | #include "CoinPackedMatrix.hpp" |
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15 | |
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16 | /** Define a follow on class. |
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17 | The idea of this is that in air-crew scheduling problems crew may fly in on flight A |
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18 | and out on flight B or on some other flight. A useful branch is one which on one side |
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19 | fixes all which go out on flight B to 0, while the other branch fixes all those that do NOT |
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20 | go out on flight B to 0. |
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21 | |
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22 | This branching rule should be in addition to normal rules and have a high priority. |
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23 | */ |
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24 | |
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25 | class CbcFollowOn : public CbcObject { |
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26 | |
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27 | public: |
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28 | |
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29 | // Default Constructor |
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30 | CbcFollowOn (); |
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31 | |
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32 | /** Useful constructor |
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33 | */ |
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34 | CbcFollowOn (CbcModel * model); |
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35 | |
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36 | // Copy constructor |
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37 | CbcFollowOn ( const CbcFollowOn &); |
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38 | |
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39 | /// Clone |
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40 | virtual CbcObject * clone() const; |
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41 | |
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42 | // Assignment operator |
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43 | CbcFollowOn & operator=( const CbcFollowOn& rhs); |
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44 | |
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45 | // Destructor |
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46 | ~CbcFollowOn (); |
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47 | |
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48 | /// Infeasibility - large is 0.5 |
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49 | virtual double infeasibility(const OsiBranchingInformation * info, |
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50 | int &preferredWay) const; |
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51 | |
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52 | using CbcObject::feasibleRegion ; |
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53 | /// This looks at solution and sets bounds to contain solution |
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54 | virtual void feasibleRegion(); |
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55 | |
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56 | /// Creates a branching object |
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57 | virtual CbcBranchingObject * createCbcBranch(OsiSolverInterface * solver, const OsiBranchingInformation * info, int way) ; |
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58 | /// As some computation is needed in more than one place - returns row |
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59 | virtual int gutsOfFollowOn(int & otherRow, int & preferredWay) const; |
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60 | |
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61 | protected: |
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62 | /// data |
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63 | /// Matrix |
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64 | CoinPackedMatrix matrix_; |
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65 | /// Matrix by row |
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66 | CoinPackedMatrix matrixByRow_; |
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67 | /// Possible rhs (if 0 then not possible) |
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68 | int * rhs_; |
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69 | }; |
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70 | |
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71 | /** General Branching Object class. |
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72 | Each way fixes some variables to lower bound |
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73 | */ |
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74 | class CbcFixingBranchingObject : public CbcBranchingObject { |
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75 | |
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76 | public: |
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77 | |
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78 | // Default Constructor |
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79 | CbcFixingBranchingObject (); |
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80 | |
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81 | // Useful constructor |
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82 | CbcFixingBranchingObject (CbcModel * model, |
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83 | int way, |
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84 | int numberOnDownSide, const int * down, |
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85 | int numberOnUpSide, const int * up); |
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86 | |
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87 | // Copy constructor |
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88 | CbcFixingBranchingObject ( const CbcFixingBranchingObject &); |
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89 | |
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90 | // Assignment operator |
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91 | CbcFixingBranchingObject & operator=( const CbcFixingBranchingObject& rhs); |
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92 | |
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93 | /// Clone |
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94 | virtual CbcBranchingObject * clone() const; |
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95 | |
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96 | // Destructor |
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97 | virtual ~CbcFixingBranchingObject (); |
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98 | |
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99 | using CbcBranchingObject::branch ; |
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100 | /// Does next branch and updates state |
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101 | virtual double branch(); |
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102 | |
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103 | #ifdef JJF_ZERO |
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104 | // No need to override. Default works fine. |
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105 | /** Reset every information so that the branching object appears to point to |
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106 | the previous child. This method does not need to modify anything in any |
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107 | solver. */ |
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108 | virtual void previousBranch(); |
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109 | #endif |
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110 | |
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111 | using CbcBranchingObject::print ; |
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112 | /** \brief Print something about branch - only if log level high |
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113 | */ |
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114 | virtual void print(); |
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115 | |
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116 | /** Return the type (an integer identifier) of \c this */ |
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117 | virtual CbcBranchObjType type() const { |
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118 | return FollowOnBranchObj; |
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119 | } |
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120 | |
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121 | /** Compare the original object of \c this with the original object of \c |
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122 | brObj. Assumes that there is an ordering of the original objects. |
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123 | This method should be invoked only if \c this and brObj are of the same |
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124 | type. |
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125 | Return negative/0/positive depending on whether \c this is |
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126 | smaller/same/larger than the argument. |
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127 | */ |
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128 | virtual int compareOriginalObject(const CbcBranchingObject* brObj) const; |
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129 | |
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130 | /** Compare the \c this with \c brObj. \c this and \c brObj must be os the |
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131 | same type and must have the same original object, but they may have |
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132 | different feasible regions. |
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133 | Return the appropriate CbcRangeCompare value (first argument being the |
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134 | sub/superset if that's the case). In case of overlap (and if \c |
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135 | replaceIfOverlap is true) replace the current branching object with one |
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136 | whose feasible region is the overlap. |
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137 | */ |
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138 | virtual CbcRangeCompare compareBranchingObject |
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139 | (const CbcBranchingObject* brObj, const bool replaceIfOverlap = false); |
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140 | |
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141 | private: |
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142 | /// data |
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143 | /// Number on down list |
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144 | int numberDown_; |
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145 | /// Number on up list |
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146 | int numberUp_; |
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147 | /// downList - variables to fix to lb on down branch |
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148 | int * downList_; |
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149 | /// upList - variables to fix to lb on up branch |
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150 | int * upList_; |
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151 | }; |
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152 | |
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153 | /** Define an idiotic idea class. |
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154 | The idea of this is that we take some integer variables away from integer and |
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155 | sum them with some randomness to get signed sum close to 0.5. We then can |
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156 | branch to exclude that gap. |
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157 | |
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158 | This branching rule should be in addition to normal rules and have a high priority. |
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159 | */ |
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160 | |
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161 | class CbcIdiotBranch : public CbcObject { |
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162 | |
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163 | public: |
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164 | |
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165 | // Default Constructor |
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166 | CbcIdiotBranch (); |
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167 | |
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168 | /** Useful constructor |
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169 | */ |
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170 | CbcIdiotBranch (CbcModel * model); |
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171 | |
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172 | // Copy constructor |
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173 | CbcIdiotBranch ( const CbcIdiotBranch &); |
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174 | |
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175 | /// Clone |
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176 | virtual CbcObject * clone() const; |
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177 | |
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178 | // Assignment operator |
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179 | CbcIdiotBranch & operator=( const CbcIdiotBranch& rhs); |
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180 | |
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181 | // Destructor |
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182 | ~CbcIdiotBranch (); |
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183 | |
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184 | /// Infeasibility - large is 0.5 |
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185 | virtual double infeasibility(const OsiBranchingInformation * info, |
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186 | int &preferredWay) const; |
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187 | |
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188 | using CbcObject::feasibleRegion ; |
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189 | /// This looks at solution and sets bounds to contain solution |
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190 | virtual void feasibleRegion(); |
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191 | |
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192 | /// Creates a branching object |
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193 | virtual CbcBranchingObject * createCbcBranch(OsiSolverInterface * solver, const OsiBranchingInformation * info, int way) ; |
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194 | /// Initialize for branching |
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195 | virtual void initializeForBranching(CbcModel * ); |
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196 | protected: |
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197 | /// Build "cut" |
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198 | OsiRowCut buildCut(const OsiBranchingInformation * info,int type,int & preferredWay) const; |
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199 | /// data |
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200 | /// Thread specific random number generator |
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201 | mutable CoinThreadRandom randomNumberGenerator_; |
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202 | /// Saved version of thread specific random number generator |
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203 | mutable CoinThreadRandom savedRandomNumberGenerator_; |
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204 | }; |
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205 | |
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206 | #endif |
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207 | |
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