1 | // Copyright (C) 2004, International Business Machines |
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2 | // Corporation and others. All Rights Reserved. |
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3 | #if defined(_MSC_VER) |
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4 | // Turn off compiler warning about long names |
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5 | # pragma warning(disable:4786) |
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6 | #endif |
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7 | #include <cassert> |
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8 | #include <cmath> |
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9 | #include <cfloat> |
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10 | //#define CBC_DEBUG |
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11 | |
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12 | #include "CbcMessage.hpp" |
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13 | #include "CbcModel.hpp" |
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14 | #include "CbcTree.hpp" |
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15 | #include "CbcCompareActual.hpp" |
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16 | #include "CoinError.hpp" |
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17 | |
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18 | |
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19 | /** Default Constructor |
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20 | |
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21 | */ |
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22 | CbcCompareDepth::CbcCompareDepth () |
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23 | : CbcCompareBase() |
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24 | { |
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25 | test_=this; |
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26 | } |
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27 | |
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28 | // Copy constructor |
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29 | CbcCompareDepth::CbcCompareDepth ( const CbcCompareDepth & rhs) |
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30 | :CbcCompareBase(rhs) |
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31 | |
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32 | { |
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33 | } |
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34 | |
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35 | // Clone |
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36 | CbcCompareBase * |
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37 | CbcCompareDepth::clone() const |
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38 | { |
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39 | return new CbcCompareDepth(*this); |
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40 | } |
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41 | |
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42 | // Assignment operator |
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43 | CbcCompareDepth & |
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44 | CbcCompareDepth::operator=( const CbcCompareDepth& rhs) |
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45 | { |
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46 | if (this!=&rhs) { |
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47 | CbcCompareBase::operator=(rhs); |
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48 | } |
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49 | return *this; |
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50 | } |
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51 | |
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52 | // Destructor |
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53 | CbcCompareDepth::~CbcCompareDepth () |
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54 | { |
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55 | } |
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56 | |
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57 | // Returns true if y better than x |
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58 | bool |
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59 | CbcCompareDepth::test (CbcNode * x, CbcNode * y) |
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60 | { |
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61 | int testX = x->depth(); |
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62 | int testY = y->depth(); |
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63 | if (testX!=testY) |
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64 | return testX < testY; |
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65 | else |
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66 | return equalityTest(x,y); // so ties will be broken in consistent manner |
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67 | } |
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68 | // Create C++ lines to get to current state |
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69 | void |
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70 | CbcCompareDepth::generateCpp( FILE * fp) |
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71 | { |
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72 | fprintf(fp,"0#include \"CbcCompareActual.hpp\"\n"); |
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73 | fprintf(fp,"3 CbcCompareDepth compare;\n"); |
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74 | fprintf(fp,"3 cbcModel->setNodeComparison(compare);\n"); |
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75 | } |
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76 | |
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77 | /** Default Constructor |
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78 | |
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79 | */ |
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80 | CbcCompareObjective::CbcCompareObjective () |
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81 | : CbcCompareBase() |
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82 | { |
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83 | test_=this; |
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84 | } |
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85 | |
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86 | // Copy constructor |
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87 | CbcCompareObjective::CbcCompareObjective ( const CbcCompareObjective & rhs) |
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88 | :CbcCompareBase(rhs) |
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89 | |
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90 | { |
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91 | } |
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92 | |
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93 | // Clone |
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94 | CbcCompareBase * |
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95 | CbcCompareObjective::clone() const |
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96 | { |
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97 | return new CbcCompareObjective(*this); |
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98 | } |
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99 | |
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100 | // Assignment operator |
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101 | CbcCompareObjective & |
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102 | CbcCompareObjective::operator=( const CbcCompareObjective& rhs) |
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103 | { |
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104 | if (this!=&rhs) { |
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105 | CbcCompareBase::operator=(rhs); |
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106 | } |
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107 | return *this; |
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108 | } |
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109 | |
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110 | // Destructor |
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111 | CbcCompareObjective::~CbcCompareObjective () |
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112 | { |
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113 | } |
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114 | |
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115 | // Returns true if y better than x |
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116 | bool |
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117 | CbcCompareObjective::test (CbcNode * x, CbcNode * y) |
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118 | { |
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119 | double testX = x->objectiveValue(); |
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120 | double testY = y->objectiveValue(); |
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121 | if (testX!=testY) |
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122 | return testX > testY; |
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123 | else |
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124 | return equalityTest(x,y); // so ties will be broken in consistent manner |
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125 | } |
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126 | // Create C++ lines to get to current state |
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127 | void |
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128 | CbcCompareObjective::generateCpp( FILE * fp) |
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129 | { |
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130 | fprintf(fp,"0#include \"CbcCompareActual.hpp\"\n"); |
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131 | fprintf(fp,"3 CbcCompareObjective compare;\n"); |
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132 | fprintf(fp,"3 cbcModel->setNodeComparison(compare);\n"); |
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133 | } |
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134 | |
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135 | |
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136 | /** Default Constructor |
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137 | |
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138 | */ |
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139 | CbcCompareDefault::CbcCompareDefault () |
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140 | : CbcCompareBase(), |
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141 | weight_(-1.0), |
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142 | saveWeight_(0.0), |
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143 | numberSolutions_(0), |
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144 | treeSize_(0), |
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145 | breadthDepth_(5) |
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146 | { |
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147 | test_=this; |
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148 | } |
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149 | |
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150 | // Constructor with weight |
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151 | CbcCompareDefault::CbcCompareDefault (double weight) |
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152 | : CbcCompareBase(), |
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153 | weight_(weight) , |
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154 | saveWeight_(0.0), |
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155 | numberSolutions_(0), |
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156 | treeSize_(0), |
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157 | breadthDepth_(5) |
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158 | { |
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159 | test_=this; |
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160 | } |
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161 | |
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162 | |
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163 | // Copy constructor |
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164 | CbcCompareDefault::CbcCompareDefault ( const CbcCompareDefault & rhs) |
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165 | :CbcCompareBase(rhs) |
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166 | |
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167 | { |
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168 | weight_=rhs.weight_; |
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169 | saveWeight_ = rhs.saveWeight_; |
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170 | numberSolutions_=rhs.numberSolutions_; |
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171 | treeSize_ = rhs.treeSize_; |
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172 | breadthDepth_ = rhs.breadthDepth_; |
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173 | } |
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174 | |
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175 | // Clone |
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176 | CbcCompareBase * |
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177 | CbcCompareDefault::clone() const |
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178 | { |
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179 | return new CbcCompareDefault(*this); |
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180 | } |
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181 | |
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182 | // Assignment operator |
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183 | CbcCompareDefault & |
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184 | CbcCompareDefault::operator=( const CbcCompareDefault& rhs) |
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185 | { |
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186 | if (this!=&rhs) { |
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187 | CbcCompareBase::operator=(rhs); |
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188 | weight_=rhs.weight_; |
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189 | saveWeight_ = rhs.saveWeight_; |
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190 | numberSolutions_=rhs.numberSolutions_; |
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191 | treeSize_ = rhs.treeSize_; |
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192 | breadthDepth_ = rhs.breadthDepth_; |
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193 | } |
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194 | return *this; |
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195 | } |
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196 | |
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197 | // Destructor |
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198 | CbcCompareDefault::~CbcCompareDefault () |
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199 | { |
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200 | } |
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201 | |
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202 | // Returns true if y better than x |
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203 | bool |
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204 | CbcCompareDefault::test (CbcNode * x, CbcNode * y) |
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205 | { |
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206 | #if 0 |
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207 | // always choose *smallest* depth if one or both <= breadthDepth_ |
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208 | int depthX = x->depth(); |
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209 | int depthY = y->depth(); |
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210 | if (depthX<=breadthDepth_||depthY<=breadthDepth_) { |
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211 | if (depthX!=depthY) |
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212 | return depthX > depthY; |
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213 | else |
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214 | return equalityTest(x,y); // so ties will be broken in consistent manner |
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215 | } |
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216 | if (weight_==-1.0||weight_==-3.0) { |
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217 | int adjust = (weight_==-3.0) ? 10000 : 0; |
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218 | // before solution |
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219 | /*printf("x %d %d %g, y %d %d %g\n", |
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220 | x->numberUnsatisfied(),x->depth(),x->objectiveValue(), |
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221 | y->numberUnsatisfied(),y->depth(),y->objectiveValue()); */ |
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222 | if (x->numberUnsatisfied() > y->numberUnsatisfied()+adjust) { |
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223 | return true; |
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224 | } else if (x->numberUnsatisfied() < y->numberUnsatisfied()-adjust) { |
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225 | return false; |
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226 | } else { |
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227 | int depthX = x->depth(); |
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228 | int depthY = y->depth(); |
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229 | if (depthX!=depthY) |
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230 | return depthX < depthY; |
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231 | else |
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232 | return equalityTest(x,y); // so ties will be broken in consistent manner |
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233 | } |
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234 | } else { |
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235 | // after solution |
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236 | double weight = CoinMax(weight_,0.0); |
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237 | double testX = x->objectiveValue()+ weight*x->numberUnsatisfied(); |
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238 | double testY = y->objectiveValue() + weight*y->numberUnsatisfied(); |
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239 | if (testX!=testY) |
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240 | return testX > testY; |
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241 | else |
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242 | return equalityTest(x,y); // so ties will be broken in consistent manner |
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243 | } |
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244 | #else |
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245 | if ((weight_==-1.0&&(y->depth()>breadthDepth_&&x->depth()>breadthDepth_))||weight_==-3.0||weight_==-2.0) { |
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246 | int adjust = (weight_==-3.0) ? 10000 : 0; |
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247 | // before solution |
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248 | /*printf("x %d %d %g, y %d %d %g\n", |
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249 | x->numberUnsatisfied(),x->depth(),x->objectiveValue(), |
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250 | y->numberUnsatisfied(),y->depth(),y->objectiveValue()); */ |
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251 | if (x->numberUnsatisfied() > y->numberUnsatisfied()+adjust) { |
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252 | return true; |
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253 | } else if (x->numberUnsatisfied() < y->numberUnsatisfied()-adjust) { |
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254 | return false; |
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255 | } else { |
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256 | int depthX = x->depth(); |
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257 | int depthY = y->depth(); |
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258 | if (depthX!=depthY) |
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259 | return depthX < depthY; |
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260 | else |
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261 | return equalityTest(x,y); // so ties will be broken in consistent manner |
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262 | } |
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263 | } else { |
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264 | // always choose *greatest* depth if both <= breadthDepth_ otherwise <= breadthDepth_ if just one |
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265 | int depthX = x->depth(); |
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266 | int depthY = y->depth(); |
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267 | /*if ((depthX==4&&depthY==5)||(depthX==5&&depthY==4)) |
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268 | printf("X %x depth %d, Y %x depth %d, breadth %d\n", |
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269 | x,depthX,y,depthY,breadthDepth_);*/ |
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270 | if (depthX<=breadthDepth_||depthY<=breadthDepth_) { |
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271 | if (depthX<=breadthDepth_&&depthY<=breadthDepth_) { |
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272 | if (depthX!=depthY) { |
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273 | return depthX < depthY; |
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274 | } |
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275 | } else { |
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276 | assert (depthX!=depthY) ; |
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277 | return depthX > depthY; |
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278 | } |
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279 | } |
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280 | // after solution |
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281 | double weight = CoinMax(weight_,0.0); |
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282 | double testX = x->objectiveValue()+ weight*x->numberUnsatisfied(); |
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283 | double testY = y->objectiveValue() + weight*y->numberUnsatisfied(); |
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284 | if (testX!=testY) |
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285 | return testX > testY; |
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286 | else |
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287 | return equalityTest(x,y); // so ties will be broken in consistent manner |
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288 | } |
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289 | #endif |
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290 | } |
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291 | // This allows method to change behavior as it is called |
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292 | // after each solution |
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293 | void |
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294 | CbcCompareDefault::newSolution(CbcModel * model, |
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295 | double objectiveAtContinuous, |
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296 | int numberInfeasibilitiesAtContinuous) |
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297 | { |
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298 | if (model->getSolutionCount()==model->getNumberHeuristicSolutions()&& |
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299 | model->getSolutionCount()<5&&model->getNodeCount()<500) |
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300 | return; // solution was got by rounding |
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301 | // set to get close to this solution |
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302 | double costPerInteger = |
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303 | (model->getObjValue()-objectiveAtContinuous)/ |
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304 | ((double) numberInfeasibilitiesAtContinuous); |
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305 | weight_ = 0.95*costPerInteger; |
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306 | saveWeight_ = 0.95*weight_; |
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307 | numberSolutions_++; |
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308 | if (numberSolutions_>5) |
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309 | weight_ =0.0; // this searches on objective |
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310 | } |
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311 | // This allows method to change behavior |
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312 | bool |
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313 | CbcCompareDefault::every1000Nodes(CbcModel * model, int numberNodes) |
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314 | { |
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315 | #if 0 |
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316 | // was |
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317 | if (numberNodes>10000) |
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318 | weight_ =0.0; // this searches on objective |
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319 | // get size of tree |
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320 | treeSize_ = model->tree()->size(); |
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321 | #else |
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322 | double saveWeight=weight_; |
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323 | int numberNodes1000 = numberNodes/1000; |
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324 | if (numberNodes>10000) { |
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325 | weight_ =0.0; // this searches on objective |
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326 | // but try a bit of other stuff |
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327 | if ((numberNodes1000%4)==1) |
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328 | weight_=saveWeight_; |
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329 | } else if (numberNodes==1000&&weight_==-2.0) { |
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330 | weight_=-1.0; // Go to depth first |
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331 | } |
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332 | // get size of tree |
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333 | treeSize_ = model->tree()->size(); |
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334 | if (treeSize_>10000) { |
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335 | int n1 = model->solver()->getNumRows()+model->solver()->getNumCols(); |
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336 | int n2 = model->numberObjects(); |
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337 | double size = n1*0.1 + n2*2.0; |
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338 | // set weight to reduce size most of time |
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339 | if (treeSize_*size>5.0e7) |
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340 | weight_=-1.0; |
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341 | else if ((numberNodes1000%4)==0&&treeSize_*size>1.0e6) |
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342 | weight_=-1.0; |
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343 | else if ((numberNodes1000%4)==1) |
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344 | weight_=0.0; |
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345 | else |
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346 | weight_=saveWeight_; |
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347 | } |
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348 | #endif |
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349 | //return numberNodes==11000; // resort if first time |
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350 | return (weight_!=saveWeight); |
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351 | } |
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352 | |
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353 | // Create C++ lines to get to current state |
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354 | void |
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355 | CbcCompareDefault::generateCpp( FILE * fp) |
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356 | { |
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357 | CbcCompareDefault other; |
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358 | fprintf(fp,"0#include \"CbcCompareActual.hpp\"\n"); |
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359 | fprintf(fp,"3 CbcCompareDefault compare;\n"); |
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360 | if (weight_!=other.weight_) |
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361 | fprintf(fp,"3 compare.setWeight(%g);\n",weight_); |
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362 | fprintf(fp,"3 cbcModel->setNodeComparison(compare);\n"); |
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363 | } |
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364 | |
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365 | /** Default Constructor |
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366 | |
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367 | */ |
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368 | CbcCompareEstimate::CbcCompareEstimate () |
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369 | : CbcCompareBase() |
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370 | { |
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371 | test_=this; |
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372 | } |
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373 | |
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374 | // Copy constructor |
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375 | CbcCompareEstimate::CbcCompareEstimate ( const CbcCompareEstimate & rhs) |
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376 | :CbcCompareBase(rhs) |
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377 | |
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378 | { |
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379 | } |
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380 | |
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381 | // Clone |
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382 | CbcCompareBase * |
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383 | CbcCompareEstimate::clone() const |
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384 | { |
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385 | return new CbcCompareEstimate(*this); |
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386 | } |
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387 | |
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388 | // Assignment operator |
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389 | CbcCompareEstimate & |
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390 | CbcCompareEstimate::operator=( const CbcCompareEstimate& rhs) |
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391 | { |
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392 | if (this!=&rhs) { |
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393 | CbcCompareBase::operator=(rhs); |
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394 | } |
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395 | return *this; |
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396 | } |
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397 | |
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398 | // Destructor |
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399 | CbcCompareEstimate::~CbcCompareEstimate () |
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400 | { |
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401 | } |
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402 | |
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403 | // Returns true if y better than x |
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404 | bool |
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405 | CbcCompareEstimate::test (CbcNode * x, CbcNode * y) |
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406 | { |
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407 | double testX = x->guessedObjectiveValue(); |
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408 | double testY = y->guessedObjectiveValue(); |
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409 | if (testX!=testY) |
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410 | return testX > testY; |
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411 | else |
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412 | return equalityTest(x,y); // so ties will be broken in consistent manner |
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413 | } |
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414 | |
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415 | // Create C++ lines to get to current state |
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416 | void |
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417 | CbcCompareEstimate::generateCpp( FILE * fp) |
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418 | { |
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419 | fprintf(fp,"0#include \"CbcCompareActual.hpp\"\n"); |
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420 | fprintf(fp,"3 CbcCompareEstimate compare;\n"); |
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421 | fprintf(fp,"3 cbcModel->setNodeComparison(compare);\n"); |
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422 | } |
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