1 | /* $Id: CbcHeuristicFPump.hpp 1573 2011-01-05 01:12:36Z stefan $ */ |
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2 | // Copyright (C) 2004, 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 CbcHeuristicFeasibilityPump_H |
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7 | #define CbcHeuristicFeasibilityPump_H |
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8 | |
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9 | #include "CbcHeuristic.hpp" |
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10 | #include "OsiClpSolverInterface.hpp" |
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11 | |
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12 | /** Feasibility Pump class |
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13 | */ |
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14 | |
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15 | class CbcHeuristicFPump : public CbcHeuristic { |
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16 | public: |
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17 | |
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18 | // Default Constructor |
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19 | CbcHeuristicFPump (); |
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20 | |
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21 | // Constructor with model - assumed before cuts |
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22 | CbcHeuristicFPump (CbcModel & model, |
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23 | double downValue = 0.5, bool roundExpensive = false); |
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24 | |
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25 | // Copy constructor |
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26 | CbcHeuristicFPump ( const CbcHeuristicFPump &); |
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27 | |
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28 | // Destructor |
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29 | ~CbcHeuristicFPump (); |
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30 | |
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31 | /// Assignment operator |
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32 | CbcHeuristicFPump & operator=(const CbcHeuristicFPump& rhs); |
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33 | /// Clone |
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34 | virtual CbcHeuristic * clone() const; |
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35 | /// Create C++ lines to get to current state |
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36 | virtual void generateCpp( FILE * fp) ; |
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37 | |
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38 | /// Resets stuff if model changes |
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39 | virtual void resetModel(CbcModel * model); |
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40 | |
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41 | /// update model (This is needed if cliques update matrix etc) |
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42 | virtual void setModel(CbcModel * model); |
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43 | |
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44 | using CbcHeuristic::solution ; |
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45 | /** returns 0 if no solution, 1 if valid solution |
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46 | with better objective value than one passed in |
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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 | |
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50 | It may make sense for user to call this outside Branch and Cut to |
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51 | get solution. Or normally is just at root node. |
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52 | |
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53 | * new meanings for when_ - on first try then set back to 1 |
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54 | 11 - at end fix all integers at same bound throughout |
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55 | 12 - also fix all integers staying at same internal integral value throughout |
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56 | 13 - also fix all continuous variables staying at same bound throughout |
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57 | 14 - also fix all continuous variables staying at same internal value throughout |
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58 | 15 - as 13 but no internal integers |
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59 | And beyond that, it's apparently possible for the range to be between 21 |
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60 | and 25, in which case it's reduced on entry to solution() to be between |
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61 | 11 and 15 and allSlack is set to true. Then, if we're not processing |
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62 | general integers, we'll use an all-slack basis to solve ... what? Don't |
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63 | see that yet. |
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64 | */ |
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65 | virtual int solution(double & objectiveValue, |
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66 | double * newSolution); |
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67 | |
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68 | /// Set maximum Time (default off) - also sets starttime to current |
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69 | void setMaximumTime(double value); |
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70 | /// Get maximum Time (default 0.0 == time limit off) |
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71 | inline double maximumTime() const { |
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72 | return maximumTime_; |
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73 | } |
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74 | /// Set fake cutoff (default COIN_DBL_MAX == off) |
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75 | inline void setFakeCutoff(double value) { |
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76 | fakeCutoff_ = value; |
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77 | } |
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78 | /// Get fake cutoff (default 0.0 == off) |
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79 | inline double fakeCutoff() const { |
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80 | return fakeCutoff_; |
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81 | } |
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82 | /// Set absolute increment (default 0.0 == off) |
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83 | inline void setAbsoluteIncrement(double value) { |
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84 | absoluteIncrement_ = value; |
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85 | } |
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86 | /// Get absolute increment (default 0.0 == off) |
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87 | inline double absoluteIncrement() const { |
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88 | return absoluteIncrement_; |
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89 | } |
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90 | /// Set relative increment (default 0.0 == off) |
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91 | inline void setRelativeIncrement(double value) { |
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92 | relativeIncrement_ = value; |
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93 | } |
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94 | /// Get relative increment (default 0.0 == off) |
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95 | inline double relativeIncrement() const { |
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96 | return relativeIncrement_; |
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97 | } |
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98 | /// Set default rounding (default 0.5) |
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99 | inline void setDefaultRounding(double value) { |
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100 | defaultRounding_ = value; |
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101 | } |
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102 | /// Get default rounding (default 0.5) |
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103 | inline double defaultRounding() const { |
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104 | return defaultRounding_; |
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105 | } |
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106 | /// Set initial weight (default 0.0 == off) |
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107 | inline void setInitialWeight(double value) { |
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108 | initialWeight_ = value; |
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109 | } |
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110 | /// Get initial weight (default 0.0 == off) |
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111 | inline double initialWeight() const { |
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112 | return initialWeight_; |
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113 | } |
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114 | /// Set weight factor (default 0.1) |
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115 | inline void setWeightFactor(double value) { |
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116 | weightFactor_ = value; |
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117 | } |
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118 | /// Get weight factor (default 0.1) |
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119 | inline double weightFactor() const { |
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120 | return weightFactor_; |
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121 | } |
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122 | /// Set threshold cost for using original cost - even on continuous (default infinity) |
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123 | inline void setArtificialCost(double value) { |
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124 | artificialCost_ = value; |
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125 | } |
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126 | /// Get threshold cost for using original cost - even on continuous (default infinity) |
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127 | inline double artificialCost() const { |
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128 | return artificialCost_; |
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129 | } |
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130 | /// Get iteration to size ratio |
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131 | inline double iterationRatio() const { |
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132 | return iterationRatio_; |
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133 | } |
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134 | /// Set iteration to size ratio |
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135 | inline void setIterationRatio(double value) { |
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136 | iterationRatio_ = value; |
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137 | } |
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138 | /// Set maximum passes (default 100) |
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139 | inline void setMaximumPasses(int value) { |
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140 | maximumPasses_ = value; |
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141 | } |
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142 | /// Get maximum passes (default 100) |
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143 | inline int maximumPasses() const { |
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144 | return maximumPasses_; |
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145 | } |
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146 | /// Set maximum retries (default 1) |
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147 | inline void setMaximumRetries(int value) { |
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148 | maximumRetries_ = value; |
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149 | } |
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150 | /// Get maximum retries (default 1) |
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151 | inline int maximumRetries() const { |
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152 | return maximumRetries_; |
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153 | } |
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154 | /** Set use of multiple solutions and solves |
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155 | 0 - do not reuse solves, do not accumulate integer solutions for local search |
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156 | 1 - do not reuse solves, accumulate integer solutions for local search |
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157 | 2 - reuse solves, do not accumulate integer solutions for local search |
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158 | 3 - reuse solves, accumulate integer solutions for local search |
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159 | If we add 4 then use second form of problem (with extra rows and variables for general integers) |
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160 | At some point (date?), I added |
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161 | |
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162 | And then there are a few bit fields: |
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163 | 4 - something about general integers |
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164 | So my (lh) guess for 4 was at least in the ballpark, but I'll have to |
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165 | rethink 8 entirely (and it may well not mean the same thing as it did |
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166 | when I added that comment. |
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167 | 8 - determines whether we process general integers |
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168 | |
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169 | And on 090831, John added |
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170 | |
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171 | If we add 4 then use second form of problem (with extra rows and |
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172 | variables for general integers) |
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173 | If we add 8 then can run after initial cuts (if no solution) |
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174 | */ |
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175 | inline void setAccumulate(int value) { |
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176 | accumulate_ = value; |
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177 | } |
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178 | /// Get accumulation option |
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179 | inline int accumulate() const { |
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180 | return accumulate_; |
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181 | } |
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182 | /** Set whether to fix variables on known solution |
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183 | 0 - do not fix |
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184 | 1 - fix integers on reduced costs |
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185 | 2 - fix integers on reduced costs but only on entry |
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186 | */ |
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187 | inline void setFixOnReducedCosts(int value) { |
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188 | fixOnReducedCosts_ = value; |
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189 | } |
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190 | /// Get reduced cost option |
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191 | inline int fixOnReducedCosts() const { |
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192 | return fixOnReducedCosts_; |
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193 | } |
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194 | /** Set reduced cost multiplier |
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195 | 1.0 as normal |
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196 | <1.0 (x) - pretend gap is x* actual gap - just for fixing |
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197 | */ |
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198 | inline void setReducedCostMultiplier(double value) { |
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199 | reducedCostMultiplier_ = value; |
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200 | } |
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201 | /// Get reduced cost multiplier |
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202 | inline double reducedCostMultiplier() const { |
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203 | return reducedCostMultiplier_; |
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204 | } |
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205 | |
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206 | protected: |
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207 | // Data |
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208 | /// Start time |
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209 | double startTime_; |
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210 | /// Maximum Cpu seconds |
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211 | double maximumTime_; |
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212 | /** Fake cutoff value. |
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213 | If set then better of real cutoff and this used to add a constraint |
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214 | */ |
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215 | double fakeCutoff_; |
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216 | /// If positive carry on after solution expecting gain of at least this |
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217 | double absoluteIncrement_; |
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218 | /// If positive carry on after solution expecting gain of at least this times objective |
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219 | double relativeIncrement_; |
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220 | /// Default is round up if > this |
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221 | double defaultRounding_; |
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222 | /// Initial weight for true objective |
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223 | double initialWeight_; |
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224 | /// Factor for decreasing weight |
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225 | double weightFactor_; |
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226 | /// Threshold cost for using original cost - even on continuous |
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227 | double artificialCost_; |
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228 | /** If iterationRatio >0 use instead of maximumPasses_ |
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229 | test is iterations > ratio*(2*nrow+ncol) */ |
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230 | double iterationRatio_; |
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231 | /** Reduced cost multiplier |
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232 | 1.0 as normal |
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233 | <1.0 (x) - pretend gap is x* actual gap - just for fixing |
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234 | */ |
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235 | double reducedCostMultiplier_; |
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236 | /// Maximum number of passes |
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237 | int maximumPasses_; |
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238 | /** Maximum number of retries if we find a solution. |
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239 | If negative we clean out used array |
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240 | */ |
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241 | int maximumRetries_; |
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242 | /** Set use of multiple solutions and solves |
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243 | 0 - do not reuse solves, do not accumulate integer solutions for local search |
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244 | 1 - do not reuse solves, accumulate integer solutions for local search |
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245 | 2 - reuse solves, do not accumulate integer solutions for local search |
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246 | 3 - reuse solves, accumulate integer solutions for local search |
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247 | If we add 4 then use second form of problem (with extra rows and variables for general integers) |
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248 | If we do not accumulate solutions then no mini branch and bounds will be done |
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249 | reuse - refers to initial solve after adding in new "cut" |
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250 | If we add 8 then can run after initial cuts (if no solution) |
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251 | */ |
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252 | int accumulate_; |
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253 | /** Set whether to fix variables on known solution |
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254 | 0 - do not fix |
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255 | 1 - fix integers on reduced costs |
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256 | 2 - fix integers on reduced costs but only on entry |
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257 | */ |
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258 | int fixOnReducedCosts_; |
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259 | /// If true round to expensive |
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260 | bool roundExpensive_; |
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261 | |
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262 | private: |
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263 | /** Rounds solution - down if < downValue |
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264 | If roundExpensive then always to more expnsive. |
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265 | returns 0 if current is solution |
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266 | */ |
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267 | int rounds(OsiSolverInterface * solver, double * solution, |
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268 | /*const double * objective, */ |
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269 | int numberIntegers, const int * integerVariable, |
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270 | /*char * pumpPrint,*/int passNumber, |
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271 | /*bool roundExpensive=false,*/ |
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272 | double downValue = 0.5, int *flip = 0); |
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273 | /* note for eagle eyed readers. |
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274 | when_ can now be exotic - |
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275 | <=10 normal |
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276 | */ |
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277 | }; |
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278 | |
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279 | # ifdef COIN_HAS_CLP |
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280 | |
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281 | class CbcDisasterHandler : public OsiClpDisasterHandler { |
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282 | public: |
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283 | /**@name Virtual methods that the derived classe should provide. |
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284 | */ |
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285 | //@{ |
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286 | #ifdef JJF_ZERO |
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287 | /// Into simplex |
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288 | virtual void intoSimplex(); |
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289 | /// Checks if disaster |
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290 | virtual bool check() const ; |
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291 | /// saves information for next attempt |
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292 | virtual void saveInfo(); |
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293 | #endif |
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294 | /// Type of disaster 0 can fix, 1 abort |
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295 | virtual int typeOfDisaster(); |
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296 | //@} |
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297 | |
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298 | |
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299 | /**@name Constructors, destructor */ |
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300 | |
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301 | //@{ |
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302 | /** Default constructor. */ |
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303 | CbcDisasterHandler(CbcModel * model = NULL); |
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304 | /** Destructor */ |
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305 | virtual ~CbcDisasterHandler(); |
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306 | // Copy |
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307 | CbcDisasterHandler(const CbcDisasterHandler&); |
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308 | // Assignment |
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309 | CbcDisasterHandler& operator=(const CbcDisasterHandler&); |
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310 | /// Clone |
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311 | virtual ClpDisasterHandler * clone() const; |
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312 | |
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313 | //@} |
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314 | |
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315 | /**@name Sets/gets */ |
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316 | |
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317 | //@{ |
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318 | /** set model. */ |
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319 | void setCbcModel(CbcModel * model); |
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320 | /// Get model |
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321 | inline CbcModel * cbcModel() const { |
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322 | return cbcModel_; |
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323 | } |
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324 | |
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325 | //@} |
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326 | |
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327 | |
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328 | protected: |
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329 | /**@name Data members |
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330 | The data members are protected to allow access for derived classes. */ |
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331 | //@{ |
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332 | /// Pointer to model |
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333 | CbcModel * cbcModel_; |
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334 | |
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335 | //@} |
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336 | }; |
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337 | #endif |
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338 | |
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339 | #endif |
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340 | |
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