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authorHarpreet2016-09-03 00:36:51 +0530
committerHarpreet2016-09-03 00:36:51 +0530
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+/* $Id: CbcHeuristicLocal.hpp 1943 2013-07-21 09:05:45Z forrest $ */
+// Copyright (C) 2002, International Business Machines
+// Corporation and others. All Rights Reserved.
+// This code is licensed under the terms of the Eclipse Public License (EPL).
+
+#ifndef CbcHeuristicLocal_H
+#define CbcHeuristicLocal_H
+
+#include "CbcHeuristic.hpp"
+/** LocalSearch class
+ */
+
+class CbcHeuristicLocal : public CbcHeuristic {
+public:
+
+ // Default Constructor
+ CbcHeuristicLocal ();
+
+ /* Constructor with model - assumed before cuts
+ Initial version does not do Lps
+ */
+ CbcHeuristicLocal (CbcModel & model);
+
+ // Copy constructor
+ CbcHeuristicLocal ( const CbcHeuristicLocal &);
+
+ // Destructor
+ ~CbcHeuristicLocal ();
+
+ /// Clone
+ virtual CbcHeuristic * clone() const;
+
+ /// Assignment operator
+ CbcHeuristicLocal & operator=(const CbcHeuristicLocal& rhs);
+
+ /// Create C++ lines to get to current state
+ virtual void generateCpp( FILE * fp) ;
+
+ /// Resets stuff if model changes
+ virtual void resetModel(CbcModel * model);
+
+ /// update model (This is needed if cliques update matrix etc)
+ virtual void setModel(CbcModel * model);
+
+ using CbcHeuristic::solution ;
+ /** returns 0 if no solution, 1 if valid solution.
+ Sets solution values if good, sets objective value (only if good)
+ This is called after cuts have been added - so can not add cuts
+ First tries setting a variable to better value. If feasible then
+ tries setting others. If not feasible then tries swaps
+
+ ********
+
+ This first version does not do LP's and does swaps of two integer
+ variables. Later versions could do Lps.
+ */
+ virtual int solution(double & objectiveValue,
+ double * newSolution);
+ /// This version fixes stuff and does IP
+ int solutionFix(double & objectiveValue,
+ double * newSolution,
+ const int * keep);
+
+ /// Sets type of search
+ inline void setSearchType(int value) {
+ swap_ = value;
+ }
+ /// Used array so we can set
+ inline int * used() const {
+ return used_;
+ }
+
+protected:
+ // Data
+
+ // Original matrix by column
+ CoinPackedMatrix matrix_;
+
+ // Number of solutions so we only do after new solution
+ int numberSolutions_;
+ // Type of search 0=normal, 1=BAB
+ int swap_;
+ /// Whether a variable has been in a solution (also when)
+ int * used_;
+};
+
+/** Proximity Search class
+ */
+class CbcHeuristicFPump;
+class CbcHeuristicProximity : public CbcHeuristic {
+public:
+
+ // Default Constructor
+ CbcHeuristicProximity ();
+
+ /* Constructor with model - assumed before cuts
+ */
+ CbcHeuristicProximity (CbcModel & model);
+
+ // Copy constructor
+ CbcHeuristicProximity ( const CbcHeuristicProximity &);
+
+ // Destructor
+ ~CbcHeuristicProximity ();
+
+ /// Clone
+ virtual CbcHeuristic * clone() const;
+
+ /// Assignment operator
+ CbcHeuristicProximity & operator=(const CbcHeuristicProximity& rhs);
+
+ /// Create C++ lines to get to current state
+ virtual void generateCpp( FILE * fp) ;
+
+ /// Resets stuff if model changes
+ virtual void resetModel(CbcModel * model);
+
+ /// update model (This is needed if cliques update matrix etc)
+ virtual void setModel(CbcModel * model);
+
+ using CbcHeuristic::solution ;
+ /** returns 0 if no solution, 1 if valid solution.
+ Sets solution values if good, sets objective value (only if good)
+ */
+ virtual int solution(double & objectiveValue,
+ double * newSolution);
+ /// Set extra increment
+ inline void setIncrement(double value)
+ { increment_ = value;}
+ /// Used array so we can set
+ inline int * used() const {
+ return used_;
+ }
+
+protected:
+ // Data
+ /// Increment to use if no change
+ double increment_;
+ /// Copy of Feasibility pump
+ CbcHeuristicFPump * feasibilityPump_;
+ /// Number of solutions so we only do after new solution
+ int numberSolutions_;
+ /// Whether a variable has been in a solution (also when)
+ int * used_;
+};
+
+
+/** Naive class
+ a) Fix all ints as close to zero as possible
+ b) Fix all ints with nonzero costs and < large to zero
+ c) Put bounds round continuous and UIs and maximize
+ */
+
+class CbcHeuristicNaive : public CbcHeuristic {
+public:
+
+ // Default Constructor
+ CbcHeuristicNaive ();
+
+ /* Constructor with model - assumed before cuts
+ Initial version does not do Lps
+ */
+ CbcHeuristicNaive (CbcModel & model);
+
+ // Copy constructor
+ CbcHeuristicNaive ( const CbcHeuristicNaive &);
+
+ // Destructor
+ ~CbcHeuristicNaive ();
+
+ /// Clone
+ virtual CbcHeuristic * clone() const;
+
+ /// Assignment operator
+ CbcHeuristicNaive & operator=(const CbcHeuristicNaive& rhs);
+
+ /// Create C++ lines to get to current state
+ virtual void generateCpp( FILE * fp) ;
+
+ /// Resets stuff if model changes
+ virtual void resetModel(CbcModel * model);
+
+ /// update model (This is needed if cliques update matrix etc)
+ virtual void setModel(CbcModel * model);
+
+ using CbcHeuristic::solution ;
+ /** returns 0 if no solution, 1 if valid solution.
+ Sets solution values if good, sets objective value (only if good)
+ */
+ virtual int solution(double & objectiveValue,
+ double * newSolution);
+
+ /// Sets large cost value
+ inline void setLargeValue(double value) {
+ large_ = value;
+ }
+ /// Gets large cost value
+ inline double largeValue() const {
+ return large_;
+ }
+
+protected:
+ /// Data
+ /// Large value
+ double large_;
+};
+
+/** Crossover Search class
+ */
+
+class CbcHeuristicCrossover : public CbcHeuristic {
+public:
+
+ // Default Constructor
+ CbcHeuristicCrossover ();
+
+ /* Constructor with model - assumed before cuts
+ Initial version does not do Lps
+ */
+ CbcHeuristicCrossover (CbcModel & model);
+
+ // Copy constructor
+ CbcHeuristicCrossover ( const CbcHeuristicCrossover &);
+
+ // Destructor
+ ~CbcHeuristicCrossover ();
+
+ /// Clone
+ virtual CbcHeuristic * clone() const;
+
+ /// Assignment operator
+ CbcHeuristicCrossover & operator=(const CbcHeuristicCrossover& rhs);
+
+ /// Create C++ lines to get to current state
+ virtual void generateCpp( FILE * fp) ;
+
+ /// Resets stuff if model changes
+ virtual void resetModel(CbcModel * model);
+
+ /// update model (This is needed if cliques update matrix etc)
+ virtual void setModel(CbcModel * model);
+
+ using CbcHeuristic::solution ;
+ /** returns 0 if no solution, 1 if valid solution.
+ Fix variables if agree in useNumber_ solutions
+ when_ 0 off, 1 only at new solutions, 2 also every now and then
+ add 10 to make only if agree at lower bound
+ */
+ virtual int solution(double & objectiveValue,
+ double * newSolution);
+
+ /// Sets number of solutions to use
+ inline void setNumberSolutions(int value) {
+ if (value > 0 && value <= 10)
+ useNumber_ = value;
+ }
+
+protected:
+ // Data
+ /// Attempts
+ std::vector <double> attempts_;
+ /// Random numbers to stop same search happening
+ double random_[10];
+ /// Number of solutions so we only do after new solution
+ int numberSolutions_;
+ /// Number of solutions to use
+ int useNumber_;
+};
+
+#endif
+