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# /home/coin/svn-release/Blis-0.93.2/Blis/src/BlisTreeNode.h

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    00001 /*===========================================================================*
    00002  * This file is part of the BiCePS Linear Integer Solver (BLIS).             *
    00003  *                                                                           *
    00004  * BLIS is distributed under the Eclipse Public License as part of the       *
    00005  * COIN-OR repository (http://www.coin-or.org).                              *
    00006  *                                                                           *
    00007  * Authors:                                                                  *
    00008  *                                                                           *
    00009  *          Yan Xu, Lehigh University                                        *
    00010  *          Ted Ralphs, Lehigh University                                    *
    00011  *                                                                           *
    00012  * Conceptual Design:                                                        *
    00013  *                                                                           *
    00014  *          Yan Xu, Lehigh University                                        *
    00015  *          Ted Ralphs, Lehigh University                                    *
    00016  *          Laszlo Ladanyi, IBM T.J. Watson Research Center                  *
    00017  *          Matthew Saltzman, Clemson University                             *
    00018  *                                                                           *
    00019  *                                                                           *
    00020  * Copyright (C) 2001-2011, Lehigh University, Yan Xu, and Ted Ralphs.       *
    00021  * All Rights Reserved.                                                      *
    00022  *===========================================================================*/
    00023
    00024 #ifndef BlisTreeNode_h_
    00025 #define BlisTreeNode_h_
    00026
    00027 //#############################################################################
    00028
    00029 #include "AlpsNodeDesc.h"
    00030
    00031 #include "BcpsObjectPool.h"
    00032 #include "BcpsTreeNode.h"
    00033
    00034 #include "BcpsNodeDesc.h"
    00035 #include "BlisNodeDesc.h"
    00036
    00037 class BcpsModel;
    00038 class BlisModel;
    00039
    00040
    00041 //#############################################################################
    00045 //#############################################################################
    00046
    00047
    00048 class BlisTreeNode : public BcpsTreeNode {
    00049 private:
    00050
    00052     BlisTreeNode(const BlisTreeNode&);
    00053
    00054     BlisTreeNode& operator=(const BlisTreeNode&);
    00055
    00057     //BcpsConstraintPool *constraintPool_;
    00058
    00060     //BcpsVariablePool *variablePool_;
    00061
    00063     //void saveExplicit();
    00064
    00066     bool parallel(BlisModel *model,
    00067                   BcpsConstraintPool &conPool,
    00068                   int lastNew,
    00069                   BlisConstraint *aCon);
    00070
    00072     double estimateSolution(BlisModel *model,
    00073                             const double *lpSolution,
    00074                             double lpObjValue) const;
    00075
    00076 public:
    00077
    00079     BlisTreeNode()
    00080         :
    00081         BcpsTreeNode()
    00082         { init(); }
    00083
    00085     BlisTreeNode(BlisModel* m) {
    00086         init();
    00087         desc_ = new BlisNodeDesc(m);
    00088     }
    00089
    00091     BlisTreeNode(AlpsNodeDesc *&desc) {
    00092         init();
    00093         desc_ = desc;
    00094         desc = NULL;
    00095     }
    00096
    00098     virtual ~BlisTreeNode() {
    00099         //std::cout << "------ Delete blis part of node" << std::endl;
    00100     }
    00101
    00103     void init() {
    00104         //constraintPool_ = new BcpsConstraintPool;
    00105         //variablePool_ = new BcpsVariablePool;
    00106     }
    00107
    00109     AlpsTreeNode* createNewTreeNode(AlpsNodeDesc *&desc) const;
    00110
    00112
    00113     virtual void convertToExplicit();
    00114     virtual void convertToRelative();
    00116
    00118     virtual int installSubProblem(BcpsModel *mode);
    00119
    00121     virtual int process(bool isRoot = false, bool rampUp = false);
    00122
    00124     virtual int bound(BcpsModel *model);
    00125
    00130     virtual std::vector< CoinTriple<AlpsNodeDesc*, AlpsNodeStatus, double> >
    00131         branch();
    00132
    00134     int selectBranchObject(BlisModel *model,
    00135                            bool& foundSol,
    00136                            int numPassesLeft);
    00137
    00139     virtual int chooseBranchingObject(BcpsModel*) { return AlpsReturnStatusOk;}
    00140
    00141     // Why need below?
    00142     //using BcpsTreeNode::generateConstraints ;
    00143
    00145     int generateConstraints(BlisModel *model, BcpsConstraintPool &conPool);
    00146
    00151     int callHeuristics(BlisModel *model, bool onlyBeforeRoot=false);
    00152
    00154     void getViolatedConstraints(BlisModel *model,
    00155                                 const double *currLpSolution,
    00156                                 BcpsConstraintPool & conPool);
    00157
    00159     BlisReturnStatus applyConstraints(BlisModel *model,
    00160                                       const double *solution,
    00161                                       BcpsConstraintPool & conPool);
    00162
    00164     BlisReturnStatus reducedCostFix(BlisModel *model);
    00165
    00167     //BcpsConstraintPool * constraintPool() { return constraintPool_; }
    00168
    00170     //BcpsVariablePool * variablePool() { return variablePool_; }
    00171
    00172     using AlpsKnowledge::encode ;
    00174     virtual AlpsEncoded* encode() const;
    00175
    00177     virtual AlpsKnowledge* decode(AlpsEncoded&) const;
    00178 };
    00179
    00180 #endif