OsiObject for variables in a MINLP. More...

#include <CouenneVarObject.hpp>

Inheritance diagram for Couenne::CouenneVarObject:

Public Member Functions
	CouenneVarObject (CouenneCutGenerator c, CouenneProblem p, exprVar ref, Bonmin::BabSetupBase base, JnlstPtr jnlst, int varSelection)
	Constructor with information for branching point selection strategy. More...

	CouenneVarObject (const CouenneVarObject &src)
	Copy constructor. More...

	~CouenneVarObject ()
	Destructor. More...

virtual CouenneObject *	clone () const
	Cloning method. More...

virtual double	infeasibility (const OsiBranchingInformation *info, int &way) const
	compute infeasibility of this variable x as the sum/min/max of all infeasibilities of auxiliaries w whose defining function depends on x \|w - f(x)\| More...

virtual double	checkInfeasibility (const OsiBranchingInformation *info) const
	compute infeasibility of this variable, \|w - f(x)\|, where w is the auxiliary variable defined as w = f(x) More...

virtual OsiBranchingObject *	createBranch (OsiSolverInterface , const OsiBranchingInformation , int) const
	create CouenneBranchingObject or CouenneThreeWayBranchObj based on this object More...

virtual double	feasibleRegion (OsiSolverInterface , const OsiBranchingInformation ) const
	fix nonlinear coordinates of current integer-nonlinear feasible solution More...

virtual bool	isCuttable () const
	are we on the bad or good side of the expression? More...

Public Member Functions inherited from Couenne::CouenneObject
	CouenneObject ()
	empty constructor (for unused objects) More...

	CouenneObject (CouenneCutGenerator cutgen, CouenneProblem p, exprVar ref, Bonmin::BabSetupBase base, JnlstPtr jnlst)
	Constructor with information for branching point selection strategy. More...

	CouenneObject (exprVar ref, Bonmin::BabSetupBase base, JnlstPtr jnlst)
	Constructor with lesser information, used for infeasibility only. More...

	~CouenneObject ()
	Destructor. More...

	CouenneObject (const CouenneObject &src)
	Copy constructor. More...

void	setParameters (Bonmin::BabSetupBase *base)
	set object parameters by reading from command line More...

exprVar *	Reference () const
	return reference auxiliary variable More...

enum brSelStrat	Strategy () const
	return branching point selection strategy More...

CouNumber	getBrPoint (funtriplet ft, CouNumber x0, CouNumber l, CouNumber u, const OsiBranchingInformation info=NULL) const
	pick branching point based on current strategy More...

CouNumber	midInterval (CouNumber x, CouNumber l, CouNumber u, const OsiBranchingInformation *info=NULL) const
	returns a point "inside enough" a given interval, or x if it already is. More...

virtual double	downEstimate () const
	Return "down" estimate (for non-convex, distance old <–> new LP point) More...

virtual double	upEstimate () const
	Return "up" estimate (for non-convex, distance old <–> new LP point) More...

void	setEstimate (double est, int direction)
	set up/down estimate (0 for down, 1 for up). More...

void	setEstimates (const OsiBranchingInformation info, CouNumber infeasibility, CouNumber *brpt) const
	set up/down estimates based on branching information More...

virtual double	intInfeasibility (double value, double lb, double ub) const
	integer infeasibility: min {value - floor(value), ceil(value) - value} More...

CouNumber	lp_clamp () const
	Defines safe interval percentage for using LP point as a branching point. More...

virtual int	columnNumber () const
	Returns the column index. More...

Protected Member Functions
CouNumber	computeBranchingPoint (const OsiBranchingInformation info, int &bestWay, const CouenneObject &criticalObject) const
	Method computing the branching point. More...

Protected Attributes
int	varSelection_
	branching scheme used. More...

Protected Attributes inherited from Couenne::CouenneObject
CouenneCutGenerator *	cutGen_
	pointer to cut generator (not necessary, can be NULL) More...

CouenneProblem *	problem_
	pointer to Couenne problem More...

exprVar *	reference_
	The (auxiliary) variable this branching object refers to. More...

enum brSelStrat	strategy_
	Branching point selection strategy. More...

JnlstPtr	jnlst_
	SmartPointer to the Journalist. More...

CouNumber	alpha_
	Combination parameter for the mid-point branching point selection strategy. More...

CouNumber	lp_clamp_
	Defines safe interval percentage for using LP point as a branching point. More...

CouNumber	feas_tolerance_
	feasibility tolerance (equal to that of CouenneProblem) More...

bool	doFBBT_
	shall we do Feasibility based Bound Tightening (FBBT) at branching? More...

bool	doConvCuts_
	shall we add convexification cuts at branching? More...

double	downEstimate_
	down estimate (to be used in pseudocost) More...

double	upEstimate_
	up estimate (to be used in pseudocost) More...

enum pseudocostMult	pseudoMultType_
	multiplier type for pseudocost More...

Additional Inherited Members
Public Types inherited from Couenne::CouenneObject
enum	pseudocostMult { INFEASIBILITY, INTERVAL_LP, INTERVAL_LP_REV, INTERVAL_BR, INTERVAL_BR_REV, PROJECTDIST }
	type of up/down estimate to return for pseudocosts More...

enum	branch_obj { EXPR_OBJ, VAR_OBJ, VT_OBJ }
	type of object (for branching variable selection) More...

enum	brSelStrat { NO_STRATEGY, NO_BRANCH, MID_INTERVAL, MIN_AREA, BALANCED, LP_CENTRAL, LP_CLAMPED }
	strategy names More...

Detailed Description

OsiObject for variables in a MINLP.

Definition at line 22 of file CouenneVarObject.hpp.

Constructor & Destructor Documentation

Couenne::CouenneVarObject::CouenneVarObject	(	CouenneCutGenerator *	c,
		CouenneProblem *	p,
		exprVar *	ref,
		Bonmin::BabSetupBase *	base,
		JnlstPtr	jnlst,
		int	varSelection
	)

Constructor with information for branching point selection strategy.

Referenced by clone().

Couenne::CouenneVarObject::CouenneVarObject ( const CouenneVarObject & src )

inline

Copy constructor.

Definition at line 35 of file CouenneVarObject.hpp.

Couenne::CouenneVarObject::~CouenneVarObject ( )

inline

Destructor.

Definition at line 40 of file CouenneVarObject.hpp.

Member Function Documentation

virtual CouenneObject* Couenne::CouenneVarObject::clone ( ) const

inlinevirtual

Cloning method.

Reimplemented from Couenne::CouenneObject.

Reimplemented in Couenne::CouenneVTObject.

Definition at line 43 of file CouenneVarObject.hpp.

References CouenneVarObject().

virtual double Couenne::CouenneVarObject::infeasibility	(	const OsiBranchingInformation *	info,
		int &	way
	)		const

virtual

compute infeasibility of this variable x as the sum/min/max of all infeasibilities of auxiliaries w whose defining function depends on x |w - f(x)|

TODO: suggest way

Reimplemented from Couenne::CouenneObject.

Reimplemented in Couenne::CouenneVTObject.

virtual double Couenne::CouenneVarObject::checkInfeasibility ( const OsiBranchingInformation * info ) const

virtual

compute infeasibility of this variable, |w - f(x)|, where w is the auxiliary variable defined as w = f(x)

Reimplemented from Couenne::CouenneObject.

virtual OsiBranchingObject* Couenne::CouenneVarObject::createBranch	(	OsiSolverInterface *	,
		const OsiBranchingInformation *	,
		int
	)		const

virtual

create CouenneBranchingObject or CouenneThreeWayBranchObj based on this object

Reimplemented from Couenne::CouenneObject.

virtual double Couenne::CouenneVarObject::feasibleRegion	(	OsiSolverInterface *	,
		const OsiBranchingInformation *
	)		const

virtual

fix nonlinear coordinates of current integer-nonlinear feasible solution

Reimplemented from Couenne::CouenneObject.

virtual bool Couenne::CouenneVarObject::isCuttable ( ) const

virtual

are we on the bad or good side of the expression?

Reimplemented from Couenne::CouenneObject.

CouNumber Couenne::CouenneVarObject::computeBranchingPoint	(	const OsiBranchingInformation *	info,
		int &	bestWay,
		const CouenneObject *&	criticalObject
	)		const

protected

Method computing the branching point.

Member Data Documentation

int Couenne::CouenneVarObject::varSelection_

protected

branching scheme used.

Experimental: still figuring out why plain LP branching doesn't work with strong/reliability branching

Definition at line 73 of file CouenneVarObject.hpp.

The documentation for this class was generated from the following file:

CouenneVarObject.hpp

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation