1 | // $Id: CbcCompareDefault.hpp 1902 2013-04-10 16:58:16Z stefan $ |
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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 11/25/09 carved out of CbcCompareActual |
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7 | |
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8 | #ifndef CbcCompareDefault_H |
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9 | #define CbcCompareDefault_H |
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10 | |
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11 | |
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12 | //############################################################################# |
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13 | /* These are alternative strategies for node traversal. |
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14 | They can take data etc for fine tuning |
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15 | |
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16 | At present the node list is stored as a heap and the "test" |
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17 | comparison function returns true if node y is better than node x. |
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18 | |
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19 | */ |
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20 | #include "CbcNode.hpp" |
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21 | #include "CbcCompareBase.hpp" |
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22 | #include "CbcCompare.hpp" |
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23 | |
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24 | class CbcModel; |
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25 | |
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26 | /* This is an example of a more complex rule with data |
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27 | It is default after first solution |
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28 | If weight is 0.0 then it is computed to hit first solution |
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29 | less 5% |
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30 | */ |
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31 | class CbcCompareDefault : public CbcCompareBase { |
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32 | public: |
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33 | /// Default Constructor |
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34 | CbcCompareDefault () ; |
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35 | /// Constructor with weight |
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36 | CbcCompareDefault (double weight); |
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37 | |
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38 | /// Copy constructor |
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39 | CbcCompareDefault ( const CbcCompareDefault &rhs); |
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40 | |
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41 | /// Assignment operator |
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42 | CbcCompareDefault & operator=( const CbcCompareDefault& rhs); |
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43 | |
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44 | /// Clone |
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45 | virtual CbcCompareBase * clone() const; |
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46 | /// Create C++ lines to get to current state |
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47 | virtual void generateCpp( FILE * fp); |
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48 | |
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49 | ~CbcCompareDefault() ; |
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50 | /* This returns true if weighted value of node y is less than |
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51 | weighted value of node x */ |
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52 | virtual bool test (CbcNode * x, CbcNode * y) ; |
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53 | |
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54 | using CbcCompareBase::newSolution ; |
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55 | /// This allows method to change behavior as it is called |
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56 | /// after each solution |
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57 | virtual bool newSolution(CbcModel * model, |
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58 | double objectiveAtContinuous, |
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59 | int numberInfeasibilitiesAtContinuous) ; |
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60 | /// This allows method to change behavior |
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61 | /// Return true if want tree re-sorted |
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62 | virtual bool every1000Nodes(CbcModel * model, int numberNodes); |
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63 | |
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64 | /* if weight == -1.0 then fewest infeasibilities (before solution) |
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65 | if -2.0 then do breadth first just for first 1000 nodes |
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66 | if -3.0 then depth first before solution |
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67 | */ |
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68 | inline double getWeight() const { |
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69 | return weight_; |
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70 | } |
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71 | inline void setWeight(double weight) { |
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72 | weight_ = weight; |
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73 | } |
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74 | /// Cutoff |
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75 | inline double getCutoff() const { |
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76 | return cutoff_; |
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77 | } |
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78 | inline void setCutoff(double cutoff) { |
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79 | cutoff_ = cutoff; |
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80 | } |
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81 | /// Best possible solution |
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82 | inline double getBestPossible() const { |
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83 | return bestPossible_; |
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84 | } |
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85 | inline void setBestPossible(double bestPossible) { |
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86 | bestPossible_ = bestPossible; |
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87 | } |
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88 | /// Depth above which want to explore first |
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89 | inline void setBreadthDepth(int value) { |
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90 | breadthDepth_ = value; |
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91 | } |
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92 | /// Start dive |
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93 | void startDive(CbcModel * model); |
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94 | /// Clean up diving (i.e. switch off or prepare) |
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95 | void cleanDive(); |
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96 | protected: |
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97 | /// Weight for each infeasibility |
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98 | double weight_; |
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99 | /// Weight for each infeasibility - computed from solution |
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100 | double saveWeight_; |
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101 | /// Cutoff |
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102 | double cutoff_; |
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103 | /// Best possible solution |
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104 | double bestPossible_; |
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105 | /// Number of solutions |
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106 | int numberSolutions_; |
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107 | /// Tree size (at last check) |
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108 | int treeSize_; |
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109 | /// Depth above which want to explore first |
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110 | int breadthDepth_; |
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111 | /// Chosen node from estimated (-1 is off) |
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112 | int startNodeNumber_; |
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113 | /// Node number when dive started |
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114 | int afterNodeNumber_; |
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115 | /// Indicates doing setup for diving |
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116 | bool setupForDiving_ ; |
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117 | }; |
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118 | |
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119 | #endif //CbcCompareDefault_H |
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120 | |
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