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authorHarpreet2016-09-03 00:34:27 +0530
committerHarpreet2016-09-03 00:34:27 +0530
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treed9d06639fb7fa61aef59be0363655e4747105ec7 /newstructure/thirdparty/linux/include/coin/CbcBranchDynamic.hpp
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+/* $Id: CbcBranchDynamic.hpp 1573 2011-01-05 01:12:36Z lou $ */
+// Copyright (C) 2005, International Business Machines
+// Corporation and others. All Rights Reserved.
+// This code is licensed under the terms of the Eclipse Public License (EPL).
+
+#ifndef CbcBranchDynamic_H
+#define CbcBranchDynamic_H
+
+#include "CoinPackedMatrix.hpp"
+#include "CbcSimpleIntegerDynamicPseudoCost.hpp"
+#include "CbcBranchActual.hpp"
+
+/** Branching decision dynamic class
+
+ This class implements a simple algorithm
+ (betterBranch()) for choosing a branching variable when dynamic pseudo costs.
+*/
+
+class CbcBranchDynamicDecision : public CbcBranchDecision {
+public:
+ // Default Constructor
+ CbcBranchDynamicDecision ();
+
+ // Copy constructor
+ CbcBranchDynamicDecision ( const CbcBranchDynamicDecision &);
+
+ virtual ~CbcBranchDynamicDecision();
+
+ /// Clone
+ virtual CbcBranchDecision * clone() const;
+
+ /// Initialize, <i>e.g.</i> before the start of branch selection at a node
+ virtual void initialize(CbcModel * model);
+
+ /** \brief Compare two branching objects. Return nonzero if \p thisOne is
+ better than \p bestSoFar.
+
+ The routine compares branches using the values supplied in \p numInfUp and
+ \p numInfDn until a solution is found by search, after which it uses the
+ values supplied in \p changeUp and \p changeDn. The best branching object
+ seen so far and the associated parameter values are remembered in the
+ \c CbcBranchDynamicDecision object. The nonzero return value is +1 if the
+ up branch is preferred, -1 if the down branch is preferred.
+
+ As the names imply, the assumption is that the values supplied for
+ \p numInfUp and \p numInfDn will be the number of infeasibilities reported
+ by the branching object, and \p changeUp and \p changeDn will be the
+ estimated change in objective. Other measures can be used if desired.
+
+ Because an \c CbcBranchDynamicDecision object remembers the current best
+ branching candidate (#bestObject_) as well as the values used in the
+ comparison, the parameter \p bestSoFar is redundant, hence unused.
+ */
+ virtual int betterBranch(CbcBranchingObject * thisOne,
+ CbcBranchingObject * bestSoFar,
+ double changeUp, int numInfUp,
+ double changeDn, int numInfDn);
+ /** Sets or gets best criterion so far */
+ virtual void setBestCriterion(double value);
+ virtual double getBestCriterion() const;
+ /** Says whether this method can handle both methods -
+ 1 better, 2 best, 3 both */
+ virtual int whichMethod() {
+ return 3;
+ }
+
+ /** Saves a clone of current branching object. Can be used to update
+ information on object causing branch - after branch */
+ virtual void saveBranchingObject(OsiBranchingObject * object) ;
+ /** Pass in information on branch just done.
+ assumes object can get information from solver */
+ virtual void updateInformation(OsiSolverInterface * solver,
+ const CbcNode * node);
+
+
+private:
+
+ /// Illegal Assignment operator
+ CbcBranchDynamicDecision & operator=(const CbcBranchDynamicDecision& rhs);
+
+ /// data
+
+ /// "best" so far
+ double bestCriterion_;
+
+ /// Change up for best
+ double bestChangeUp_;
+
+ /// Number of infeasibilities for up
+ int bestNumberUp_;
+
+ /// Change down for best
+ double bestChangeDown_;
+
+ /// Number of infeasibilities for down
+ int bestNumberDown_;
+
+ /// Pointer to best branching object
+ CbcBranchingObject * bestObject_;
+};
+/** Simple branching object for an integer variable with pseudo costs
+
+ This object can specify a two-way branch on an integer variable. For each
+ arm of the branch, the upper and lower bounds on the variable can be
+ independently specified.
+
+ Variable_ holds the index of the integer variable in the integerVariable_
+ array of the model.
+*/
+
+class CbcDynamicPseudoCostBranchingObject : public CbcIntegerBranchingObject {
+
+public:
+
+ /// Default constructor
+ CbcDynamicPseudoCostBranchingObject ();
+
+ /** Create a standard floor/ceiling branch object
+
+ Specifies a simple two-way branch. Let \p value = x*. One arm of the
+ branch will be is lb <= x <= floor(x*), the other ceil(x*) <= x <= ub.
+ Specify way = -1 to set the object state to perform the down arm first,
+ way = 1 for the up arm.
+ */
+ CbcDynamicPseudoCostBranchingObject (CbcModel *model, int variable,
+ int way , double value,
+ CbcSimpleIntegerDynamicPseudoCost * object) ;
+
+ /** Create a degenerate branch object
+
+ Specifies a `one-way branch'. Calling branch() for this object will
+ always result in lowerValue <= x <= upperValue. Used to fix a variable
+ when lowerValue = upperValue.
+ */
+
+ CbcDynamicPseudoCostBranchingObject (CbcModel *model, int variable, int way,
+ double lowerValue, double upperValue) ;
+
+ /// Copy constructor
+ CbcDynamicPseudoCostBranchingObject ( const CbcDynamicPseudoCostBranchingObject &);
+
+ /// Assignment operator
+ CbcDynamicPseudoCostBranchingObject & operator= (const CbcDynamicPseudoCostBranchingObject& rhs);
+
+ /// Clone
+ virtual CbcBranchingObject * clone() const;
+
+ /// Destructor
+ virtual ~CbcDynamicPseudoCostBranchingObject ();
+
+ /// Does part of constructor
+ void fillPart (int variable,
+ int way , double value,
+ CbcSimpleIntegerDynamicPseudoCost * object) ;
+
+ using CbcBranchingObject::branch ;
+ /** \brief Sets the bounds for the variable according to the current arm
+ of the branch and advances the object state to the next arm.
+ This version also changes guessed objective value
+ */
+ virtual double branch();
+
+ /** Some branchingObjects may claim to be able to skip
+ strong branching. If so they have to fill in CbcStrongInfo.
+ The object mention in incoming CbcStrongInfo must match.
+ Returns nonzero if skip is wanted */
+ virtual int fillStrongInfo( CbcStrongInfo & info);
+
+ /// Change in guessed
+ inline double changeInGuessed() const {
+ return changeInGuessed_;
+ }
+ /// Set change in guessed
+ inline void setChangeInGuessed(double value) {
+ changeInGuessed_ = value;
+ }
+ /// Return object
+ inline CbcSimpleIntegerDynamicPseudoCost * object() const {
+ return object_;
+ }
+ /// Set object
+ inline void setObject(CbcSimpleIntegerDynamicPseudoCost * object) {
+ object_ = object;
+ }
+
+ /** Return the type (an integer identifier) of \c this */
+ virtual CbcBranchObjType type() const {
+ return DynamicPseudoCostBranchObj;
+ }
+
+ // LL: compareOriginalObject and compareBranchingObject are inherited from
+ // CbcIntegerBranchingObject thus need not be declared/defined here. After
+ // all, this kind of branching object is simply using pseudocosts to make
+ // decisions, but once the decisions are made they are the same kind as in
+ // the underlying class.
+
+protected:
+ /// Change in guessed objective value for next branch
+ double changeInGuessed_;
+ /// Pointer back to object
+ CbcSimpleIntegerDynamicPseudoCost * object_;
+
+};
+
+#endif
+