Detailed Description

bilinear nonlinear handler

Author: Benjamin Mueller

#include <string.h>
#include "scip/nlhdlr_bilinear.h"
#include "scip/cons_nonlinear.h"
#include "scip/expr_product.h"
#include "scip/expr_var.h"

Go to the source code of this file.

Macros
#define	NLHDLR_NAME "bilinear"

#define	NLHDLR_DESC "bilinear handler for expressions"

#define	NLHDLR_DETECTPRIORITY -10

#define	NLHDLR_ENFOPRIORITY -10

#define	MIN_INTERIORITY 0.01

#define	MIN_ABSBOUNDSIZE 0.1

#define	TABLE_NAME_BILINEAR "nlhdlr_bilinear"

#define	TABLE_DESC_BILINEAR "bilinear nlhdlr statistics table"

#define	TABLE_POSITION_BILINEAR 14800

#define	TABLE_EARLIEST_STAGE_BILINEAR SCIP_STAGE_INITSOLVE

#define	nlhdlrInitBilinear NULL

#define	nlhdlrInitSepaBilinear NULL

#define	nlhdlrExitSepaBilinear NULL

#define	nlhdlrEnfoBilinear NULL

Functions
static void	getIneqViol (SCIP_VAR x, SCIP_VAR y, SCIP_Real xcoef, SCIP_Real ycoef, SCIP_Real constant, SCIP_Real viol1, SCIP_Real viol2)

static SCIP_Bool	useBilinIneqs (SCIP scip, SCIP_VAR x, SCIP_VAR *y, SCIP_Real refx, SCIP_Real refy)

static void	updateBilinearRelaxation (SCIP scip, SCIP_VAR RESTRICT x, SCIP_VAR RESTRICT y, SCIP_Real bilincoef, SCIP_SIDETYPE violside, SCIP_Real refx, SCIP_Real refy, SCIP_Real RESTRICT ineqs, int nineqs, SCIP_Real mccormickval, SCIP_Real RESTRICT bestcoefx, SCIP_Real RESTRICT bestcoefy, SCIP_Real RESTRICT bestconst, SCIP_Real RESTRICT bestval, SCIP_Bool *success)

static SCIP_Bool	isPointFeasible (SCIP scip, SCIP_Real x, SCIP_Real y, SCIP_Real lbx, SCIP_Real ubx, SCIP_Real lby, SCIP_Real uby, SCIP_Real ineqs, int nineqs)

static void	getFeasiblePointsBilinear (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_EXPR expr, SCIP_INTERVAL exprbounds, SCIP_Real underineqs, int nunderineqs, SCIP_Real overineqs, int noverineqs, SCIP_Bool levelset, SCIP_Real xs, SCIP_Real ys, int npoints)

static SCIP_INTERVAL	intevalBilinear (SCIP scip, SCIP_EXPR expr, SCIP_Real underineqs, int nunderineqs, SCIP_Real overineqs, int noverineqs)

static void	reversePropBilinear (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_EXPR expr, SCIP_INTERVAL exprbounds, SCIP_Real underineqs, int nunderineqs, SCIP_Real overineqs, int noverineqs, SCIP_INTERVAL intervalx, SCIP_INTERVAL *intervaly)

static void	computeBilinEnvelope2 (SCIP scip, SCIP_Real x, SCIP_Real y, SCIP_Real mi, SCIP_Real qi, SCIP_Real mj, SCIP_Real qj, SCIP_Real RESTRICT xi, SCIP_Real RESTRICT yi, SCIP_Real RESTRICT xj, SCIP_Real RESTRICT yj, SCIP_Real RESTRICT xcoef, SCIP_Real RESTRICT ycoef, SCIP_Real RESTRICT constant)

static	SCIP_DECL_TABLEOUTPUT (tableOutputBilinear)

static	SCIP_DECL_NLHDLRCOPYHDLR (nlhdlrCopyhdlrBilinear)

static	SCIP_DECL_NLHDLRFREEHDLRDATA (nlhdlrFreehdlrdataBilinear)

static	SCIP_DECL_NLHDLRFREEEXPRDATA (nlhdlrFreeExprDataBilinear)

static	SCIP_DECL_NLHDLREXIT (nlhdlrExitBilinear)

static	SCIP_DECL_NLHDLRDETECT (nlhdlrDetectBilinear)

static	SCIP_DECL_NLHDLREVALAUX (nlhdlrEvalauxBilinear)

static	SCIP_DECL_NLHDLRESTIMATE (nlhdlrEstimateBilinear)

static	SCIP_DECL_NLHDLRINTEVAL (nlhdlrIntevalBilinear)

static	SCIP_DECL_NLHDLRREVERSEPROP (nlhdlrReversepropBilinear)

SCIP_RETCODE	SCIPincludeNlhdlrBilinear (SCIP *scip)

SCIP_EXPR **	SCIPgetExprsBilinear (SCIP_NLHDLR *nlhdlr)

int	SCIPgetNExprsBilinear (SCIP_NLHDLR *nlhdlr)

SCIP_RETCODE	SCIPaddIneqBilinear (SCIP scip, SCIP_NLHDLR nlhdlr, SCIP_EXPR expr, SCIP_Real xcoef, SCIP_Real ycoef, SCIP_Real constant, SCIP_Bool success)

void	SCIPaddBilinLinearization (SCIP scip, SCIP_Real bilincoef, SCIP_Real refpointx, SCIP_Real refpointy, SCIP_Real lincoefx, SCIP_Real lincoefy, SCIP_Real linconstant, SCIP_Bool *success)

void	SCIPaddBilinMcCormick (SCIP scip, SCIP_Real bilincoef, SCIP_Real lbx, SCIP_Real ubx, SCIP_Real refpointx, SCIP_Real lby, SCIP_Real uby, SCIP_Real refpointy, SCIP_Bool overestimate, SCIP_Real lincoefx, SCIP_Real lincoefy, SCIP_Real linconstant, SCIP_Bool *success)

void	SCIPcomputeBilinEnvelope1 (SCIP scip, SCIP_Real bilincoef, SCIP_Real lbx, SCIP_Real ubx, SCIP_Real refpointx, SCIP_Real lby, SCIP_Real uby, SCIP_Real refpointy, SCIP_Bool overestimate, SCIP_Real xcoef, SCIP_Real ycoef, SCIP_Real constant, SCIP_Real RESTRICT lincoefx, SCIP_Real RESTRICT lincoefy, SCIP_Real RESTRICT linconstant, SCIP_Bool *RESTRICT success)

void	SCIPcomputeBilinEnvelope2 (SCIP scip, SCIP_Real bilincoef, SCIP_Real lbx, SCIP_Real ubx, SCIP_Real refpointx, SCIP_Real lby, SCIP_Real uby, SCIP_Real refpointy, SCIP_Bool overestimate, SCIP_Real xcoef1, SCIP_Real ycoef1, SCIP_Real constant1, SCIP_Real xcoef2, SCIP_Real ycoef2, SCIP_Real constant2, SCIP_Real RESTRICT lincoefx, SCIP_Real RESTRICT lincoefy, SCIP_Real RESTRICT linconstant, SCIP_Bool *RESTRICT success)

Macro Definition Documentation

◆ NLHDLR_NAME

#define NLHDLR_NAME "bilinear"

Definition at line 32 of file nlhdlr_bilinear.c.

Referenced by SCIP_DECL_NLHDLRCOPYHDLR(), SCIP_DECL_TABLEOUTPUT(), SCIPaddIneqBilinear(), SCIPgetExprsBilinear(), SCIPgetNExprsBilinear(), and SCIPincludeNlhdlrBilinear().

◆ NLHDLR_DESC

#define NLHDLR_DESC "bilinear handler for expressions"

Definition at line 33 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ NLHDLR_DETECTPRIORITY

#define NLHDLR_DETECTPRIORITY -10

it is important that the nlhdlr runs after the default nldhlr

Definition at line 34 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ NLHDLR_ENFOPRIORITY

#define NLHDLR_ENFOPRIORITY -10

Definition at line 35 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ MIN_INTERIORITY

#define MIN_INTERIORITY 0.01

minimum interiority for a reference point for applying separation

Definition at line 37 of file nlhdlr_bilinear.c.

Referenced by useBilinIneqs().

◆ MIN_ABSBOUNDSIZE

#define MIN_ABSBOUNDSIZE 0.1

minimum size of variable bounds for applying separation

Definition at line 38 of file nlhdlr_bilinear.c.

Referenced by useBilinIneqs().

◆ TABLE_NAME_BILINEAR

#define TABLE_NAME_BILINEAR "nlhdlr_bilinear"

Definition at line 41 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ TABLE_DESC_BILINEAR

#define TABLE_DESC_BILINEAR "bilinear nlhdlr statistics table"

Definition at line 42 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ TABLE_POSITION_BILINEAR

#define TABLE_POSITION_BILINEAR 14800

the position of the statistics table

Definition at line 43 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ TABLE_EARLIEST_STAGE_BILINEAR

#define TABLE_EARLIEST_STAGE_BILINEAR SCIP_STAGE_INITSOLVE

output of the statistics table is only printed from this stage onwards

Definition at line 44 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ nlhdlrInitBilinear

#define nlhdlrInitBilinear NULL

callback to be called in initialization

Definition at line 1102 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ nlhdlrInitSepaBilinear

#define nlhdlrInitSepaBilinear NULL

separation initialization method of a nonlinear handler (called during CONSINITLP)

Definition at line 1243 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ nlhdlrExitSepaBilinear

#define nlhdlrExitSepaBilinear NULL

separation deinitialization method of a nonlinear handler (called during CONSEXITSOL)

Definition at line 1246 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

◆ nlhdlrEnfoBilinear

#define nlhdlrEnfoBilinear NULL

nonlinear handler separation callback

Definition at line 1249 of file nlhdlr_bilinear.c.

Referenced by SCIPincludeNlhdlrBilinear().

Function Documentation

◆ getIneqViol()

static void getIneqViol	(	SCIP_VAR *	x,
		SCIP_VAR *	y,
		SCIP_Real	xcoef,
		SCIP_Real	ycoef,
		SCIP_Real	constant,
		SCIP_Real *	viol1,
		SCIP_Real *	viol2
	)

static

helper function to compute the violation of an inequality of the form xcoef * x <= ycoef * y + constant for two corner points of the domain [lbx,ubx] x [lby,uby]

Parameters

x	first variable
y	second variable
xcoef	x-coefficient
ycoef	y-coefficient
constant	constant
viol1	buffer to store the violation of the first corner point
viol2	buffer to store the violation of the second corner point

Definition at line 86 of file nlhdlr_bilinear.c.

References MAX, NULL, SCIP_Real, SCIPvarGetLbLocal(), and SCIPvarGetUbLocal().

Referenced by SCIPaddIneqBilinear().

◆ useBilinIneqs()

static SCIP_Bool useBilinIneqs	(	SCIP *	scip,
		SCIP_VAR *	x,
		SCIP_VAR *	y,
		SCIP_Real	refx,
		SCIP_Real	refy
	)

static

auxiliary function to decide whether to use inequalities for a strong relaxation of bilinear terms or not

Parameters

scip	SCIP data structure
x	x variable
y	y variable
refx	reference point for x
refy	reference point for y

Definition at line 119 of file nlhdlr_bilinear.c.

References MAX, MIN_ABSBOUNDSIZE, MIN_INTERIORITY, NULL, SCIP_Real, SCIPepsilon(), SCIPvarGetLbLocal(), and SCIPvarGetUbLocal().

Referenced by SCIP_DECL_NLHDLRESTIMATE().

◆ updateBilinearRelaxation()

static void updateBilinearRelaxation	(	SCIP *	scip,
		SCIP_VAR *RESTRICT	x,
		SCIP_VAR *RESTRICT	y,
		SCIP_Real	bilincoef,
		SCIP_SIDETYPE	violside,
		SCIP_Real	refx,
		SCIP_Real	refy,
		SCIP_Real *RESTRICT	ineqs,
		int	nineqs,
		SCIP_Real	mccormickval,
		SCIP_Real *RESTRICT	bestcoefx,
		SCIP_Real *RESTRICT	bestcoefy,
		SCIP_Real *RESTRICT	bestconst,
		SCIP_Real *RESTRICT	bestval,
		SCIP_Bool *	success
	)

static

helper function to update the best relaxation for a bilinear term when using valid linear inequalities

Parameters

scip	SCIP data structure
x	first variable
y	second variable
bilincoef	coefficient of the bilinear term
violside	side of quadratic constraint that is violated
refx	reference point for the x variable
refy	reference point for the y variable
ineqs	coefficients of each linear inequality; stored as triple (xcoef,ycoef,constant)
nineqs	total number of inequalities
mccormickval	value of the McCormick relaxation at the reference point
bestcoefx	pointer to update the x coefficient
bestcoefy	pointer to update the y coefficient
bestconst	pointer to update the constant
bestval	value of the best relaxation that have been found so far
success	buffer to store whether we found a better relaxation

Definition at line 155 of file nlhdlr_bilinear.c.

References MAX, NULL, REALABS, SCIP_Bool, SCIP_Real, SCIP_SIDETYPE_LEFT, SCIPcomputeBilinEnvelope1(), SCIPcomputeBilinEnvelope2(), SCIPdebugMsg, SCIPisFeasGE(), SCIPisFeasLE(), SCIPisRelGT(), SCIPisRelLT(), SCIPisZero(), SCIPvarGetLbLocal(), SCIPvarGetUbLocal(), and TRUE.

Referenced by SCIP_DECL_NLHDLRESTIMATE().

◆ isPointFeasible()

static SCIP_Bool isPointFeasible	(	SCIP *	scip,
		SCIP_Real	x,
		SCIP_Real	y,
		SCIP_Real	lbx,
		SCIP_Real	ubx,
		SCIP_Real	lby,
		SCIP_Real	uby,
		SCIP_Real *	ineqs,
		int	nineqs
	)

static

helper function to determine whether a given point satisfy given inequalities

Parameters

scip	SCIP data structure
x	x-coordinate
y	y-coordinate
lbx	lower bound of x
ubx	upper bound of x
lby	lower bound of y
uby	upper bound of y
ineqs	inequalities of the form coefx x <= coefy y + constant
nineqs	total number of inequalities

Definition at line 273 of file nlhdlr_bilinear.c.

References FALSE, NULL, SCIP_Real, SCIPisGT(), SCIPisLT(), and TRUE.

Referenced by getFeasiblePointsBilinear(), and reversePropBilinear().

◆ getFeasiblePointsBilinear()

static void getFeasiblePointsBilinear	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_EXPR *	expr,
		SCIP_INTERVAL	exprbounds,
		SCIP_Real *	underineqs,
		int	nunderineqs,
		SCIP_Real *	overineqs,
		int	noverineqs,
		SCIP_Bool	levelset,
		SCIP_Real *	xs,
		SCIP_Real *	ys,
		int *	npoints
	)

static

helper function for computing all vertices of the polytope described by the linear inequalities and the local extrema of the bilinear term along each inequality

Note

there are at most 22 points where the min/max can be achieved (given that there are at most 4 inequalities)

corners of [lbx,ubx]x[lby,uby] (4)
two intersection points for each inequality with the box (8)
global maximum / minimum on each inequality (4)
intersection between two inequalities (6)

Parameters

scip	SCIP data structure
conshdlr	constraint handler, if levelset == TRUE, otherwise can be NULL
expr	product expression
exprbounds	bounds on product expression, only used if levelset == TRUE
underineqs	inequalities for underestimation
nunderineqs	total number of inequalities for underestimation
overineqs	inequalities for overestimation
noverineqs	total number of inequalities for overestimation
levelset	should the level set be considered?
xs	array to store x-coordinates of computed points
ys	array to store y-coordinates of computed points
npoints	buffer to store the total number of computed points

Definition at line 320 of file nlhdlr_bilinear.c.

References SCIP_Interval::inf, isPointFeasible(), NULL, SCIP_INTERVAL_INFINITY, SCIP_Real, SCIPdebugMsg, SCIPexprGetActivity(), SCIPexprGetChildren(), SCIPexprGetNChildren(), SCIPgetCoefExprProduct(), SCIPgetExprBoundsNonlinear(), SCIPintervalGetInf(), SCIPintervalGetSup(), SCIPintervalIsEmpty(), SCIPintervalSet(), SCIPintervalSetBounds(), SCIPintervalSolveUnivariateQuadExpression(), SCIPisRelEQ(), SCIPisRelGE(), SCIPisRelLE(), SCIPisZero(), and SCIP_Interval::sup.

Referenced by intevalBilinear(), and reversePropBilinear().

◆ intevalBilinear()

static SCIP_INTERVAL intevalBilinear	(	SCIP *	scip,
		SCIP_EXPR *	expr,
		SCIP_Real *	underineqs,
		int	nunderineqs,
		SCIP_Real *	overineqs,
		int	noverineqs
	)

static

computes interval for a bilinear term when using at least one inequality

Parameters

scip	SCIP data structure
expr	product expression
underineqs	inequalities for underestimation
nunderineqs	total number of inequalities for underestimation
overineqs	inequalities for overestimation
noverineqs	total number of inequalities for overestimation

Definition at line 603 of file nlhdlr_bilinear.c.

References FALSE, getFeasiblePointsBilinear(), MAX, NULL, SCIP_INTERVAL_INFINITY, SCIP_Real, SCIPdebugMsg, SCIPexprGetActivity(), SCIPexprGetChildren(), SCIPexprGetNChildren(), SCIPgetCoefExprProduct(), SCIPintervalIsEmpty(), SCIPintervalMulScalar(), SCIPintervalSetBounds(), SCIPintervalSetEmpty(), and SCIPintervalSetEntire().

Referenced by SCIP_DECL_NLHDLRINTEVAL().

◆ reversePropBilinear()

static void reversePropBilinear	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_EXPR *	expr,
		SCIP_INTERVAL	exprbounds,
		SCIP_Real *	underineqs,
		int	nunderineqs,
		SCIP_Real *	overineqs,
		int	noverineqs,
		SCIP_INTERVAL *	intervalx,
		SCIP_INTERVAL *	intervaly
	)

static

uses inequalities for bilinear terms to get stronger bounds during reverse propagation

Parameters

scip	SCIP data structure
conshdlr	constraint handler
expr	product expression
exprbounds	bounds on product expression
underineqs	inequalities for underestimation
nunderineqs	total number of inequalities for underestimation
overineqs	inequalities for overestimation
noverineqs	total number of inequalities for overestimation
intervalx	buffer to store the new interval for x
intervaly	buffer to store the new interval for y

Definition at line 677 of file nlhdlr_bilinear.c.

References FALSE, getFeasiblePointsBilinear(), SCIP_Interval::inf, isPointFeasible(), MAX, NULL, SCIP_Bool, SCIP_Real, SCIPdebugMsg, SCIPexprGetActivity(), SCIPexprGetChildren(), SCIPexprGetNChildren(), SCIPfeastol(), SCIPgetCoefExprProduct(), SCIPintervalSet(), SCIPintervalSetEmpty(), SCIPisRelGE(), SCIPisRelLE(), SCIP_Interval::sup, and TRUE.

Referenced by SCIP_DECL_NLHDLRREVERSEPROP().

◆ computeBilinEnvelope2()

static void computeBilinEnvelope2	(	SCIP *	scip,
		SCIP_Real	x,
		SCIP_Real	y,
		SCIP_Real	mi,
		SCIP_Real	qi,
		SCIP_Real	mj,
		SCIP_Real	qj,
		SCIP_Real *RESTRICT	xi,
		SCIP_Real *RESTRICT	yi,
		SCIP_Real *RESTRICT	xj,
		SCIP_Real *RESTRICT	yj,
		SCIP_Real *RESTRICT	xcoef,
		SCIP_Real *RESTRICT	ycoef,
		SCIP_Real *RESTRICT	constant
	)

static

helper function to compute the convex envelope of a bilinear term when two linear inequalities are given; we use the same notation and formulas as in Locatelli 2016

Parameters

scip	SCIP data structure
x	reference point for x
y	reference point for y
mi	coefficient of x in the first linear inequality
qi	constant in the first linear inequality
mj	coefficient of x in the second linear inequality
qj	constant in the second linear inequality
xi	buffer to store x coordinate of the first point
yi	buffer to store y coordinate of the first point
xj	buffer to store x coordinate of the second point
yj	buffer to store y coordinate of the second point
xcoef	buffer to store the x coefficient of the envelope
ycoef	buffer to store the y coefficient of the envelope
constant	buffer to store the constant of the envelope

Definition at line 770 of file nlhdlr_bilinear.c.

References EPSEQ, NULL, QUAD, QUAD_TO_DBL, REALABS, SCIP_Real, SCIPisEQ(), SCIPquadprecDivQD, SCIPquadprecDivQQ, SCIPquadprecProdDD, SCIPquadprecProdQD, SCIPquadprecSqrtQ, SCIPquadprecSquareQ, SCIPquadprecSumDD, SCIPquadprecSumQD, and SCIPquadprecSumQQ.

Referenced by SCIPcomputeBilinEnvelope2().

◆ SCIP_DECL_TABLEOUTPUT()

static SCIP_DECL_TABLEOUTPUT ( tableOutputBilinear )

static

output method of statistics table to output file stream 'file'

Definition at line 944 of file nlhdlr_bilinear.c.

References FALSE, NLHDLR_NAME, NULL, SCIP_CALL, SCIP_EXPRITER_DFS, SCIP_OKAY, SCIPblkmem(), SCIPconshdlrGetConss(), SCIPconshdlrGetNConss(), SCIPcreateExpriter(), SCIPexpriterGetCurrent(), SCIPexpriterGetNext(), SCIPexpriterInit(), SCIPexpriterIsEnd(), SCIPfindConshdlr(), SCIPfindNlhdlrNonlinear(), SCIPfreeExpriter(), SCIPgetExprNonlinear(), SCIPgetNlhdlrExprDataNonlinear(), SCIPhashmapCreate(), SCIPhashmapExists(), SCIPhashmapFree(), SCIPhashmapGetImageInt(), SCIPhashmapInsertInt(), SCIPhashmapSetImageInt(), SCIPinfoMessage(), and SCIPnlhdlrGetData().

◆ SCIP_DECL_NLHDLRCOPYHDLR()

static SCIP_DECL_NLHDLRCOPYHDLR ( nlhdlrCopyhdlrBilinear )

static

nonlinear handler copy callback

Definition at line 1028 of file nlhdlr_bilinear.c.

References NLHDLR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPincludeNlhdlrBilinear(), and SCIPnlhdlrGetName().

◆ SCIP_DECL_NLHDLRFREEHDLRDATA()

static SCIP_DECL_NLHDLRFREEHDLRDATA ( nlhdlrFreehdlrdataBilinear )

static

callback to free data of handler

Definition at line 1041 of file nlhdlr_bilinear.c.

References NULL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPfreeBlockMemoryArrayNull, SCIPhashmapFree(), and SCIPhashmapGetNElements().

◆ SCIP_DECL_NLHDLRFREEEXPRDATA()

static SCIP_DECL_NLHDLRFREEEXPRDATA ( nlhdlrFreeExprDataBilinear )

static

callback to free expression specific data

Definition at line 1060 of file nlhdlr_bilinear.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeBlockMemoryNull, SCIPhashmapExists(), SCIPhashmapGetImageInt(), SCIPhashmapRemove(), SCIPhashmapSetImageInt(), SCIPnlhdlrGetData(), and SCIPreleaseExpr().

◆ SCIP_DECL_NLHDLREXIT()

static SCIP_DECL_NLHDLREXIT ( nlhdlrExitBilinear )

static

callback to be called in deinitialization

Definition at line 1106 of file nlhdlr_bilinear.c.

References NULL, SCIP_OKAY, and SCIPnlhdlrGetData().

◆ SCIP_DECL_NLHDLRDETECT()

static SCIP_DECL_NLHDLRDETECT ( nlhdlrDetectBilinear )

static

callback to detect structure in expression tree

Definition at line 1116 of file nlhdlr_bilinear.c.

References FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_NLHDLR_METHOD_ACTIVITY, SCIP_NLHDLR_METHOD_SEPABOTH, SCIP_OKAY, SCIP_STAGE_INITSOLVE, SCIPallocClearBlockMemory, SCIPblkmem(), SCIPcalcMemGrowSize(), SCIPcaptureExpr(), SCIPdebugMsg, SCIPexprGetChildren(), SCIPexprGetNChildren(), SCIPgetExprNAuxvarUsesNonlinear(), SCIPgetNVars(), SCIPgetStage(), SCIPgetVarExprVar(), SCIPhashmapCreate(), SCIPhashmapExists(), SCIPhashmapInsertInt(), SCIPinfoMessage(), SCIPisExprProduct(), SCIPisExprVar(), SCIPnlhdlrGetData(), SCIPprintExpr(), SCIPreallocBlockMemoryArray, SCIPregisterExprUsageNonlinear(), SCIPvarIsBinary(), and TRUE.

◆ SCIP_DECL_NLHDLREVALAUX()

static SCIP_DECL_NLHDLREVALAUX ( nlhdlrEvalauxBilinear )

static

auxiliary evaluation callback of nonlinear handler

Definition at line 1222 of file nlhdlr_bilinear.c.

References NULL, SCIP_OKAY, SCIP_Real, SCIPexprGetChildren(), SCIPexprGetNChildren(), SCIPgetCoefExprProduct(), SCIPgetExprAuxVarNonlinear(), SCIPgetSolVal(), and SCIPisExprProduct().

◆ SCIP_DECL_NLHDLRESTIMATE()

static SCIP_DECL_NLHDLRESTIMATE ( nlhdlrEstimateBilinear )

static

nonlinear handler under/overestimation callback

Definition at line 1253 of file nlhdlr_bilinear.c.

References FALSE, MAX, NULL, SCIP_Bool, SCIP_CALL, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIP_SIDETYPE_LEFT, SCIP_SIDETYPE_RIGHT, SCIPaddBilinMcCormick(), SCIPaddRowprepTerm(), SCIPcreateRowprep(), SCIPensureRowprepSize(), SCIPexprGetChildren(), SCIPgetCoefExprProduct(), SCIPgetCurrentNode(), SCIPgetDepth(), SCIPgetExprAuxVarNonlinear(), SCIPgetSolVal(), SCIPisFeasLE(), SCIPisGE(), SCIPisLE(), SCIPnlhdlrGetData(), SCIPnodeGetNumber(), SCIProwprepAddConstant(), SCIPsetPtrarrayVal(), SCIPvarGetLbLocal(), SCIPvarGetUbLocal(), TRUE, updateBilinearRelaxation(), useBilinIneqs(), x, and y.

◆ SCIP_DECL_NLHDLRINTEVAL()

static SCIP_DECL_NLHDLRINTEVAL ( nlhdlrIntevalBilinear )

static

nonlinear handler interval evaluation callback

Definition at line 1383 of file nlhdlr_bilinear.c.

References SCIP_Interval::inf, intevalBilinear(), NULL, SCIP_OKAY, SCIPintervalIntersect(), SCIPisGT(), SCIPisLT(), SCIPnlhdlrGetData(), and SCIP_Interval::sup.

◆ SCIP_DECL_NLHDLRREVERSEPROP()

static SCIP_DECL_NLHDLRREVERSEPROP ( nlhdlrReversepropBilinear )

static

nonlinear handler callback for reverse propagation

Definition at line 1406 of file nlhdlr_bilinear.c.

References SCIP_Interval::inf, NULL, reversePropBilinear(), SCIP_CALL, SCIP_INTERVAL_INFINITY, SCIP_OKAY, SCIPdebugMsg, SCIPexprGetChildren(), SCIPexprGetNChildren(), SCIPgetExprBoundsNonlinear(), SCIPintervalSetEntire(), SCIPnlhdlrGetData(), SCIPtightenExprIntervalNonlinear(), and SCIP_Interval::sup.

SCIP

Detailed Description

Macros

Functions

Macro Definition Documentation

◆ NLHDLR_NAME

◆ NLHDLR_DESC

◆ NLHDLR_DETECTPRIORITY

◆ NLHDLR_ENFOPRIORITY

◆ MIN_INTERIORITY

◆ MIN_ABSBOUNDSIZE

◆ TABLE_NAME_BILINEAR

◆ TABLE_DESC_BILINEAR

◆ TABLE_POSITION_BILINEAR

◆ TABLE_EARLIEST_STAGE_BILINEAR

◆ nlhdlrInitBilinear

◆ nlhdlrInitSepaBilinear

◆ nlhdlrExitSepaBilinear

◆ nlhdlrEnfoBilinear

Function Documentation

◆ getIneqViol()

◆ useBilinIneqs()

◆ updateBilinearRelaxation()

◆ isPointFeasible()

◆ getFeasiblePointsBilinear()

◆ intevalBilinear()

◆ reversePropBilinear()

◆ computeBilinEnvelope2()

◆ SCIP_DECL_TABLEOUTPUT()

◆ SCIP_DECL_NLHDLRCOPYHDLR()

◆ SCIP_DECL_NLHDLRFREEHDLRDATA()

◆ SCIP_DECL_NLHDLRFREEEXPRDATA()

◆ SCIP_DECL_NLHDLREXIT()

◆ SCIP_DECL_NLHDLRDETECT()

◆ SCIP_DECL_NLHDLREVALAUX()

◆ SCIP_DECL_NLHDLRESTIMATE()

◆ SCIP_DECL_NLHDLRINTEVAL()

◆ SCIP_DECL_NLHDLRREVERSEPROP()