1 | /* $Id: CbcHeuristicLocal.hpp 1573 2011-01-05 01:12:36Z unxusr $ */ |
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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 | #ifndef CbcHeuristicLocal_H |
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7 | #define CbcHeuristicLocal_H |
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8 | |
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9 | #include "CbcHeuristic.hpp" |
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10 | /** LocalSearch class |
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11 | */ |
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12 | |
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13 | class CbcHeuristicLocal : public CbcHeuristic { |
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14 | public: |
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15 | |
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16 | // Default Constructor |
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17 | CbcHeuristicLocal (); |
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18 | |
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19 | /* Constructor with model - assumed before cuts |
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20 | Initial version does not do Lps |
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21 | */ |
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22 | CbcHeuristicLocal (CbcModel & model); |
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23 | |
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24 | // Copy constructor |
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25 | CbcHeuristicLocal ( const CbcHeuristicLocal &); |
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26 | |
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27 | // Destructor |
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28 | ~CbcHeuristicLocal (); |
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29 | |
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30 | /// Clone |
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31 | virtual CbcHeuristic * clone() const; |
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32 | |
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33 | /// Assignment operator |
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34 | CbcHeuristicLocal & operator=(const CbcHeuristicLocal& rhs); |
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35 | |
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36 | /// Create C++ lines to get to current state |
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37 | virtual void generateCpp( FILE * fp) ; |
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38 | |
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39 | /// Resets stuff if model changes |
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40 | virtual void resetModel(CbcModel * model); |
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41 | |
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42 | /// update model (This is needed if cliques update matrix etc) |
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43 | virtual void setModel(CbcModel * model); |
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44 | |
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45 | using CbcHeuristic::solution ; |
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46 | /** returns 0 if no solution, 1 if valid solution. |
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47 | Sets solution values if good, sets objective value (only if good) |
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48 | This is called after cuts have been added - so can not add cuts |
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49 | First tries setting a variable to better value. If feasible then |
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50 | tries setting others. If not feasible then tries swaps |
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51 | |
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52 | ******** |
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53 | |
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54 | This first version does not do LP's and does swaps of two integer |
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55 | variables. Later versions could do Lps. |
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56 | */ |
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57 | virtual int solution(double & objectiveValue, |
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58 | double * newSolution); |
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59 | /// This version fixes stuff and does IP |
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60 | int solutionFix(double & objectiveValue, |
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61 | double * newSolution, |
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62 | const int * keep); |
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63 | |
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64 | /// Sets type of search |
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65 | inline void setSearchType(int value) { |
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66 | swap_ = value; |
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67 | } |
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68 | /// Used array so we can set |
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69 | inline int * used() const { |
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70 | return used_; |
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71 | } |
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72 | |
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73 | protected: |
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74 | // Data |
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75 | |
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76 | // Original matrix by column |
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77 | CoinPackedMatrix matrix_; |
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78 | |
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79 | // Number of solutions so we only do after new solution |
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80 | int numberSolutions_; |
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81 | // Type of search 0=normal, 1=BAB |
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82 | int swap_; |
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83 | /// Whether a variable has been in a solution (also when) |
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84 | int * used_; |
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85 | }; |
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86 | |
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87 | |
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88 | /** Naive class |
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89 | a) Fix all ints as close to zero as possible |
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90 | b) Fix all ints with nonzero costs and < large to zero |
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91 | c) Put bounds round continuous and UIs and maximize |
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92 | */ |
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93 | |
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94 | class CbcHeuristicNaive : public CbcHeuristic { |
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95 | public: |
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96 | |
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97 | // Default Constructor |
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98 | CbcHeuristicNaive (); |
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99 | |
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100 | /* Constructor with model - assumed before cuts |
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101 | Initial version does not do Lps |
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102 | */ |
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103 | CbcHeuristicNaive (CbcModel & model); |
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104 | |
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105 | // Copy constructor |
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106 | CbcHeuristicNaive ( const CbcHeuristicNaive &); |
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107 | |
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108 | // Destructor |
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109 | ~CbcHeuristicNaive (); |
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110 | |
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111 | /// Clone |
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112 | virtual CbcHeuristic * clone() const; |
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113 | |
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114 | /// Assignment operator |
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115 | CbcHeuristicNaive & operator=(const CbcHeuristicNaive& rhs); |
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116 | |
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117 | /// Create C++ lines to get to current state |
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118 | virtual void generateCpp( FILE * fp) ; |
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119 | |
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120 | /// Resets stuff if model changes |
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121 | virtual void resetModel(CbcModel * model); |
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122 | |
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123 | /// update model (This is needed if cliques update matrix etc) |
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124 | virtual void setModel(CbcModel * model); |
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125 | |
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126 | using CbcHeuristic::solution ; |
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127 | /** returns 0 if no solution, 1 if valid solution. |
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128 | Sets solution values if good, sets objective value (only if good) |
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129 | */ |
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130 | virtual int solution(double & objectiveValue, |
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131 | double * newSolution); |
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132 | |
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133 | /// Sets large cost value |
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134 | inline void setLargeValue(double value) { |
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135 | large_ = value; |
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136 | } |
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137 | /// Gets large cost value |
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138 | inline double largeValue() const { |
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139 | return large_; |
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140 | } |
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141 | |
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142 | protected: |
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143 | /// Data |
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144 | /// Large value |
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145 | double large_; |
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146 | }; |
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147 | |
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148 | /** Crossover Search class |
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149 | */ |
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150 | |
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151 | class CbcHeuristicCrossover : public CbcHeuristic { |
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152 | public: |
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153 | |
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154 | // Default Constructor |
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155 | CbcHeuristicCrossover (); |
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156 | |
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157 | /* Constructor with model - assumed before cuts |
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158 | Initial version does not do Lps |
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159 | */ |
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160 | CbcHeuristicCrossover (CbcModel & model); |
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161 | |
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162 | // Copy constructor |
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163 | CbcHeuristicCrossover ( const CbcHeuristicCrossover &); |
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164 | |
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165 | // Destructor |
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166 | ~CbcHeuristicCrossover (); |
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167 | |
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168 | /// Clone |
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169 | virtual CbcHeuristic * clone() const; |
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170 | |
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171 | /// Assignment operator |
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172 | CbcHeuristicCrossover & operator=(const CbcHeuristicCrossover& rhs); |
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173 | |
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174 | /// Create C++ lines to get to current state |
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175 | virtual void generateCpp( FILE * fp) ; |
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176 | |
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177 | /// Resets stuff if model changes |
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178 | virtual void resetModel(CbcModel * model); |
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179 | |
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180 | /// update model (This is needed if cliques update matrix etc) |
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181 | virtual void setModel(CbcModel * model); |
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182 | |
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183 | using CbcHeuristic::solution ; |
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184 | /** returns 0 if no solution, 1 if valid solution. |
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185 | Fix variables if agree in useNumber_ solutions |
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186 | when_ 0 off, 1 only at new solutions, 2 also every now and then |
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187 | add 10 to make only if agree at lower bound |
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188 | */ |
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189 | virtual int solution(double & objectiveValue, |
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190 | double * newSolution); |
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191 | |
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192 | /// Sets number of solutions to use |
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193 | inline void setNumberSolutions(int value) { |
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194 | if (value > 0 && value <= 10) |
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195 | useNumber_ = value; |
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196 | } |
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197 | |
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198 | protected: |
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199 | // Data |
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200 | /// Attempts |
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201 | std::vector <double> attempts_; |
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202 | /// Random numbers to stop same search happening |
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203 | double random_[10]; |
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204 | /// Number of solutions so we only do after new solution |
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205 | int numberSolutions_; |
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206 | /// Number of solutions to use |
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207 | int useNumber_; |
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208 | }; |
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209 | |
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210 | #endif |
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211 | |
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