Detailed Description

lpface primal heuristic that searches the optimal LP face inside a sub-MIP

Author: Gregor Hendel

Definition in file heur_lpface.c.

#include "blockmemshell/memory.h"
#include "scip/cons_linear.h"
#include "scip/scipdefplugins.h"
#include "scip/heur_lpface.h"
#include "scip/pub_event.h"
#include "scip/pub_heur.h"
#include "scip/pub_lp.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_sol.h"
#include "scip/pub_tree.h"
#include "scip/pub_var.h"
#include "scip/scip_branch.h"
#include "scip/scip_cons.h"
#include "scip/scip_copy.h"
#include "scip/scip_event.h"
#include "scip/scip_exact.h"
#include "scip/scip_general.h"
#include "scip/scip_heur.h"
#include "scip/scip_lp.h"
#include "scip/scip_mem.h"
#include "scip/scip_message.h"
#include "scip/scip_nodesel.h"
#include "scip/scip_numerics.h"
#include "scip/scip_param.h"
#include "scip/scip_prob.h"
#include "scip/scip_sol.h"
#include "scip/scip_solve.h"
#include "scip/scip_solvingstats.h"
#include "scip/scip_timing.h"
#include "scip/scip_tree.h"
#include "scip/scip_var.h"
#include <string.h>

Go to the source code of this file.

Data Structures
struct	SubscipData

Macros
#define	HEUR_NAME "lpface"
#define	HEUR_DESC "LNS heuristic that searches the optimal LP face inside a sub-MIP"
#define	HEUR_DISPCHAR SCIP_HEURDISPCHAR_LNS
#define	HEUR_PRIORITY -1104010
#define	HEUR_FREQ 15
#define	HEUR_FREQOFS 0
#define	HEUR_MAXDEPTH -1
#define	HEUR_TIMING SCIP_HEURTIMING_AFTERLPNODE
#define	HEUR_USESSUBSCIP TRUE
#define	DEFAULT_MAXNODES 5000LL
#define	DEFAULT_MINNODES 50LL
#define	DEFAULT_MINFIXINGRATE 0.1
#define	DEFAULT_NODESOFS 200LL
#define	DEFAULT_NODESQUOT 0.1
#define	DEFAULT_LPLIMFAC 2.0
#define	DEFAULT_USELPROWS TRUE
#define	DEFAULT_COPYCUTS TRUE
#define	DEFAULT_DUALBASISEQUATIONS FALSE
#define	DEFAULT_KEEPSUBSCIP FALSE
#define	DEFAULT_MINPATHLEN 5
#define	EVENTHDLR_NAME "Lpface"
#define	EVENTHDLR_DESC "LP event handler for " HEUR_NAME " heuristic"
#define	heurExitLpface NULL

Functions
static SCIP_RETCODE	determineVariableFixings (SCIP scip, SCIP_HEURDATA heurdata, SCIP_VAR *fixvars, SCIP_Real fixvals, int nfixvars, SCIP_Bool success)
static SCIP_RETCODE	createRows (SCIP scip, SCIP subscip, SCIP_VAR **subvars, SCIP_Bool dualbasisequations)
static SCIP_RETCODE	setupSubproblem (SCIP scip, SCIP subscip, SCIP_VAR *subvars, SCIP_HEURDATA heurdata)
static void	updateFailureStatistic (SCIP scip, SCIP_HEURDATA heurdata)
static SCIP_Longint	calcNodeLimit (SCIP scip, SCIP_HEUR heur, SCIP_HEURDATA *heurdata)
static SCIP_RETCODE	setSubscipLimits (SCIP scip, SCIP subscip, SCIP_HEUR heur, SCIP_HEURDATA heurdata, SCIP_Bool *success)
static SCIP_RETCODE	setSubscipParameters (SCIP *subscip)
static void	subscipdataReset (SUBSCIPDATA *subscipdata)
static SCIP_RETCODE	subscipdataFreeSubscip (SCIP scip, SUBSCIPDATA subscipdata)
static SCIP_RETCODE	subscipdataCopySubscip (SCIP scip, SUBSCIPDATA subscipdata, SCIP subscip, SCIP_VAR *subvars, int nvars)
static SCIP_RETCODE	changeSubvariableObjective (SCIP scip, SCIP subscip, SCIP_VAR var, SCIP_VAR subvar, SCIP_HEURDATA *heurdata)
static	SCIP_DECL_EVENTEXEC (eventExecLpface)
static SCIP_RETCODE	setupSubscipLpface (SCIP scip, SCIP subscip, SCIP_HEURDATA heurdata, SCIP_VAR subvars, SCIP_VAR vars, SCIP_VAR fixvars, SCIP_Real fixvals, int nfixvars, int nvars)
static SCIP_RETCODE	solveSubscipLpface (SCIP scip, SCIP subscip, SCIP_HEUR heur, SCIP_HEURDATA heurdata, SCIP_VAR *subvars, SCIP_RESULT result, SCIP_Real focusnodelb, SCIP_Bool *keepthisscip)
static	SCIP_DECL_HEURCOPY (heurCopyLpface)
static	SCIP_DECL_HEURFREE (heurFreeLpface)
static	SCIP_DECL_HEURINIT (heurInitLpface)
static	SCIP_DECL_HEURINITSOL (heurInitsolLpface)
static	SCIP_DECL_HEUREXITSOL (heurExitsolLpface)
static	SCIP_DECL_HEUREXEC (heurExecLpface)
SCIP_RETCODE	SCIPincludeHeurLpface (SCIP *scip)

Macro Definition Documentation

◆ HEUR_NAME

#define HEUR_NAME "lpface"

Definition at line 67 of file heur_lpface.c.

◆ HEUR_DESC

#define HEUR_DESC "LNS heuristic that searches the optimal LP face inside a sub-MIP"

Definition at line 68 of file heur_lpface.c.

◆ HEUR_DISPCHAR

#define HEUR_DISPCHAR SCIP_HEURDISPCHAR_LNS

Definition at line 69 of file heur_lpface.c.

◆ HEUR_PRIORITY

#define HEUR_PRIORITY -1104010

Definition at line 70 of file heur_lpface.c.

◆ HEUR_FREQ

#define HEUR_FREQ 15

Definition at line 71 of file heur_lpface.c.

◆ HEUR_FREQOFS

#define HEUR_FREQOFS 0

Definition at line 72 of file heur_lpface.c.

◆ HEUR_MAXDEPTH

#define HEUR_MAXDEPTH -1

Definition at line 73 of file heur_lpface.c.

◆ HEUR_TIMING

#define HEUR_TIMING SCIP_HEURTIMING_AFTERLPNODE

Definition at line 74 of file heur_lpface.c.

◆ HEUR_USESSUBSCIP

#define HEUR_USESSUBSCIP TRUE

does the heuristic use a secondary SCIP instance?

Definition at line 75 of file heur_lpface.c.

◆ DEFAULT_MAXNODES

#define DEFAULT_MAXNODES 5000LL

maximum number of nodes to regard in the subproblem

Definition at line 77 of file heur_lpface.c.

◆ DEFAULT_MINNODES

#define DEFAULT_MINNODES 50LL

minimum number of nodes to regard in the subproblem

Definition at line 78 of file heur_lpface.c.

◆ DEFAULT_MINFIXINGRATE

#define DEFAULT_MINFIXINGRATE 0.1

required percentage of fixed integer variables in sub-MIP to run

Definition at line 79 of file heur_lpface.c.

◆ DEFAULT_NODESOFS

#define DEFAULT_NODESOFS 200LL

number of nodes added to the contingent of the total nodes

Definition at line 80 of file heur_lpface.c.

◆ DEFAULT_NODESQUOT

#define DEFAULT_NODESQUOT 0.1

subproblem nodes in relation to nodes of the original problem

Definition at line 81 of file heur_lpface.c.

◆ DEFAULT_LPLIMFAC

#define DEFAULT_LPLIMFAC 2.0

factor by which the limit on the number of LP depends on the node limit

Definition at line 82 of file heur_lpface.c.

◆ DEFAULT_USELPROWS

#define DEFAULT_USELPROWS TRUE

should subproblem be created out of the rows in the LP rows, otherwise, the copy constructors of the constraints handlers are used

Definition at line 83 of file heur_lpface.c.

◆ DEFAULT_COPYCUTS

#define DEFAULT_COPYCUTS TRUE

if uselprows == FALSE, should all active cuts from cutpool be copied to constraints in subproblem?

Definition at line 85 of file heur_lpface.c.

◆ DEFAULT_DUALBASISEQUATIONS

#define DEFAULT_DUALBASISEQUATIONS FALSE

should the dually nonbasic rows be turned into equations?

Definition at line 87 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

◆ DEFAULT_KEEPSUBSCIP

#define DEFAULT_KEEPSUBSCIP FALSE

should the heuristic continue solving the same sub-SCIP?

Definition at line 88 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

◆ DEFAULT_MINPATHLEN

#define DEFAULT_MINPATHLEN 5

the minimum active search tree path length along which the lower bound hasn't changed before heuristic becomes active

Definition at line 89 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

◆ EVENTHDLR_NAME

#define EVENTHDLR_NAME "Lpface"

Definition at line 92 of file heur_lpface.c.

◆ EVENTHDLR_DESC

#define EVENTHDLR_DESC "LP event handler for " HEUR_NAME " heuristic"

Definition at line 93 of file heur_lpface.c.

◆ heurExitLpface

#define heurExitLpface NULL

Definition at line 1076 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

Typedef Documentation

◆ SUBSCIPDATA

typedef struct SubscipData SUBSCIPDATA

Definition at line 107 of file heur_lpface.c.

Function Documentation

◆ determineVariableFixings()

SCIP_RETCODE determineVariableFixings	(	SCIP *	scip,
		SCIP_HEURDATA *	heurdata,
		SCIP_VAR **	fixvars,
		SCIP_Real *	fixvals,
		int *	nfixvars,
		SCIP_Bool *	success )

static

determine variable fixings for sub-SCIP based on reduced costs

Parameters

scip	SCIP data structure
heurdata	primal heuristic data
fixvars	buffer to store variables that should be fixed
fixvals	buffer to store corresponding fixing values
nfixvars	pointer to store number of variables that should be fixed
success	pointer to store whether enough integer variables were fixed

Definition at line 147 of file heur_lpface.c.

References assert(), heurdata, i, MAX, NULL, nvars, REALABS, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPdebugMsg, SCIPgetColRedcost(), SCIPgetSolVal(), SCIPgetVarsData(), SCIPisDualfeasZero(), SCIPisFeasEQ(), SCIPisInfinity(), SCIPvarGetCol(), SCIPvarGetLbGlobal(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarIsIntegral(), SCIPvarIsRelaxationOnly(), var, and vars.

Referenced by SCIP_DECL_HEUREXEC().

◆ createRows()

SCIP_RETCODE createRows	(	SCIP *	scip,
		SCIP *	subscip,
		SCIP_VAR **	subvars,
		SCIP_Bool	dualbasisequations )

static

creates the rows of the subproblem

Parameters

scip	original SCIP data structure
subscip	SCIP data structure for the subproblem
subvars	the variables of the subproblem
dualbasisequations	should the dually nonbasic rows be turned into equations?

Definition at line 237 of file heur_lpface.c.

References assert(), FALSE, i, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddCons(), SCIPallocBufferArray, SCIPcolGetVar(), SCIPcreateConsLinear(), SCIPfreeBufferArray, SCIPgetLPRowsData(), SCIPgetRowActivity(), SCIPisDualfeasZero(), SCIPisFeasEQ(), SCIPisInfinity(), SCIPreleaseCons(), SCIProwGetCols(), SCIProwGetConstant(), SCIProwGetDualsol(), SCIProwGetLhs(), SCIProwGetName(), SCIProwGetNNonz(), SCIProwGetRhs(), SCIProwGetVals(), SCIProwIsLocal(), SCIPvarGetProbindex(), and TRUE.

Referenced by setupSubproblem().

◆ setupSubproblem()

SCIP_RETCODE setupSubproblem	(	SCIP *	scip,
		SCIP *	subscip,
		SCIP_VAR **	subvars,
		SCIP_HEURDATA *	heurdata )

static

create the LP face subproblem constraints

Parameters

scip	original SCIP data structure
subscip	SCIP data structure for the subproblem
subvars	the variables of the subproblem
heurdata	primal heuristic data

Definition at line 332 of file heur_lpface.c.

References assert(), createRows(), FALSE, heurdata, i, NULL, nvars, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddCoefLinear(), SCIPaddCons(), SCIPcreateConsLinear(), SCIPgetLowerbound(), SCIPgetNObjVars(), SCIPgetNVars(), SCIPgetVars(), SCIPisZero(), SCIPreleaseCons(), SCIPvarGetObj(), TRUE, and vars.

Referenced by setupSubscipLpface().

◆ updateFailureStatistic()

void updateFailureStatistic	(	SCIP *	scip,
		SCIP_HEURDATA *	heurdata )

static

updates heurdata after an unsuccessful run of lpface

Parameters

scip	original SCIP data structure
heurdata	primal heuristic data

Definition at line 381 of file heur_lpface.c.

References heurdata, SCIP_LONGINT_MAX, and SCIPgetNNodes().

Referenced by solveSubscipLpface().

◆ calcNodeLimit()

SCIP_Longint calcNodeLimit	(	SCIP *	scip,
		SCIP_HEUR *	heur,
		SCIP_HEURDATA *	heurdata )

static

calculate a node limit based on node limiting parameters of the heuristic

Parameters

scip	(original) SCIP data structure
heur	LP face heuristic
heurdata	primal heuristic data

Definition at line 395 of file heur_lpface.c.

References heurdata, MIN, NULL, SCIP_Longint, SCIPgetNNodes(), and SCIPheurGetNCalls().

Referenced by SCIP_DECL_HEUREXEC(), and setSubscipLimits().

◆ setSubscipLimits()

SCIP_RETCODE setSubscipLimits	(	SCIP *	scip,
		SCIP *	subscip,
		SCIP_HEUR *	heur,
		SCIP_HEURDATA *	heurdata,
		SCIP_Bool *	success )

static

sets node, time, and memory limit according to the parameter settings of the heuristic

Parameters

scip	original SCIP data structure
subscip	data structure of the sub-problem
heur	LP face heuristic
heurdata	heuristic data structure
success	did we successfully set all parameters up?

Definition at line 427 of file heur_lpface.c.

References assert(), calcNodeLimit(), FALSE, heurdata, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIPgetBoolParam(), SCIPgetMemExternEstim(), SCIPgetMemUsed(), SCIPgetNNodes(), SCIPgetRealParam(), SCIPgetSolvingTime(), SCIPisInfinity(), SCIPsetLongintParam(), SCIPsetRealParam(), and TRUE.

Referenced by solveSubscipLpface().

◆ setSubscipParameters()

SCIP_RETCODE setSubscipParameters ( SCIP * subscip )

static

sets all one-time parameter settings like search strategy, but no limits

Parameters

subscip data structure of the sub-problem

Definition at line 489 of file heur_lpface.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIP_PARAMSETTING_FAST, SCIPfindBranchrule(), SCIPfindNodesel(), SCIPisParamFixed(), SCIPsetBoolParam(), SCIPsetCharParam(), SCIPsetIntParam(), SCIPsetPresolving(), SCIPsetSeparating(), SCIPsetSubscipsOff(), and TRUE.

Referenced by setupSubscipLpface().

◆ subscipdataReset()

void subscipdataReset ( SUBSCIPDATA * subscipdata )

static

reset the sub-SCIP data to its default values

Parameters

subscipdata data structure of the sub-problem

Definition at line 545 of file heur_lpface.c.

References SubscipData::nsubvars, NULL, SubscipData::objbound, SCIP_INVALID, SubscipData::subscip, and SubscipData::subvars.

Referenced by SCIP_DECL_HEUREXEC(), SCIP_DECL_HEURINITSOL(), and subscipdataFreeSubscip().

◆ subscipdataFreeSubscip()

SCIP_RETCODE subscipdataFreeSubscip	(	SCIP *	scip,
		SUBSCIPDATA *	subscipdata )

static

free the stored sub-SCIP information

Parameters

scip	original SCIP data structure
subscipdata	data structure of the sub-problem

Definition at line 557 of file heur_lpface.c.

References assert(), SubscipData::nsubvars, NULL, SCIP_CALL, SCIP_OKAY, SCIPfree(), SCIPfreeBlockMemoryArray, SubscipData::subscip, subscipdataReset(), and SubscipData::subvars.

Referenced by SCIP_DECL_HEUREXEC(), and SCIP_DECL_HEUREXITSOL().

◆ subscipdataCopySubscip()

SCIP_RETCODE subscipdataCopySubscip	(	SCIP *	scip,
		SUBSCIPDATA *	subscipdata,
		SCIP *	subscip,
		SCIP_VAR **	subvars,
		int	nvars )

static

store the sub-SCIP to the data structure

Parameters

scip	original SCIP data structure
subscipdata	data structure of the sub-problem
subscip	sub scip data structure to keep
subvars	sub scip variable array in the order of the main SCIP variables
nvars	number of sub SCIP variables

Definition at line 586 of file heur_lpface.c.

References assert(), SubscipData::nsubvars, NULL, nvars, SubscipData::objbound, SCIP_CALL, SCIP_OKAY, SCIPduplicateBlockMemoryArray, SCIPgetCurrentNode(), SCIPgetNodeLowerbound(), SCIPgetNVars(), SubscipData::subscip, and SubscipData::subvars.

Referenced by SCIP_DECL_HEUREXEC().

◆ changeSubvariableObjective()

SCIP_RETCODE changeSubvariableObjective	(	SCIP *	scip,
		SCIP *	subscip,
		SCIP_VAR *	var,
		SCIP_VAR *	subvar,
		SCIP_HEURDATA *	heurdata )

static

create the objective function based on the user selection

Parameters

scip	SCIP data structure
subscip	sub-SCIP data structure
var	SCIP variable
subvar	sub-SCIP variable whose objective coefficient is changed
heurdata	heuristic data structure to control how the objective is changed

Definition at line 644 of file heur_lpface.c.

References heurdata, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPchgVarObj(), SCIPfrac(), SCIPgetVarAvgInferences(), SCIPvarGetLPSol(), SCIPvarGetObj(), SCIPvarGetRootSol(), and var.

Referenced by setupSubscipLpface().

◆ SCIP_DECL_EVENTEXEC()

SCIP_DECL_EVENTEXEC ( eventExecLpface )

static

execution callback of the event handler for Lpface sub-SCIP

we interrupt the solution process if we hit the LP iteration limit per node

Definition at line 709 of file heur_lpface.c.

References assert(), EVENTHDLR_NAME, heurdata, NULL, SCIP_CALL, SCIP_EVENTTYPE_LPSOLVED, SCIP_LONGINT_FORMAT, SCIP_OKAY, SCIPdebugMsg, SCIPeventGetType(), SCIPeventhdlrGetName(), SCIPgetNLPs(), and SCIPinterruptSolve().

◆ setupSubscipLpface()

SCIP_RETCODE setupSubscipLpface	(	SCIP *	scip,
		SCIP *	subscip,
		SCIP_HEURDATA *	heurdata,
		SCIP_VAR **	subvars,
		SCIP_VAR **	vars,
		SCIP_VAR **	fixvars,
		SCIP_Real *	fixvals,
		int	nfixvars,
		int	nvars )

static

setup and solve the subproblem and catch the return code

Parameters

scip	SCIP data structure
subscip	sub-SCIP data structure
heurdata	heuristics data
subvars	subproblem's variables
vars	original problem's variables
fixvars	variables that should be fixed
fixvals	corresponding fixing values
nfixvars	number of variables that should be fixed
nvars	number of original problem's variables

Definition at line 734 of file heur_lpface.c.

References assert(), changeSubvariableObjective(), FALSE, heurdata, i, NULL, nvars, SCIP_Bool, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPblkmem(), SCIPcopyConsCompression(), SCIPcopyCuts(), SCIPcopyParamSettings(), SCIPcopyPlugins(), SCIPcopyVars(), SCIPcreateProbBasic(), SCIPenableExactSolving(), SCIPgetProbName(), SCIPgetSubscipDepth(), SCIPhashmapCreate(), SCIPhashmapFree(), SCIPhashmapGetImage(), SCIPisExact(), SCIPsetIntParam(), SCIPsetSubscipDepth(), SCIPsnprintf(), setSubscipParameters(), setupSubproblem(), TRUE, valid, and vars.

Referenced by SCIP_DECL_HEUREXEC().

◆ solveSubscipLpface()

SCIP_RETCODE solveSubscipLpface	(	SCIP *	scip,
		SCIP *	subscip,
		SCIP_HEUR *	heur,
		SCIP_HEURDATA *	heurdata,
		SCIP_VAR **	subvars,
		SCIP_RESULT *	result,
		SCIP_Real	focusnodelb,
		SCIP_Bool *	keepthisscip )

static

setup and solve the subproblem and catch the return code

Parameters

scip	SCIP data structure
subscip	sub-SCIP data structure
heur	mutation heuristic
heurdata	heuristics data
subvars	subproblem's variables
result	pointer to store the result
focusnodelb	lower bound of the focus node
keepthisscip	should the subscip be kept or deleted?

Definition at line 825 of file heur_lpface.c.

References assert(), EVENTHDLR_DESC, EVENTHDLR_NAME, FALSE, HEUR_NAME, heurdata, NULL, result, SCIP_Bool, SCIP_CALL, SCIP_CALL_ABORT, SCIP_EVENTTYPE_LPSOLVED, SCIP_FOUNDSOL, SCIP_OKAY, SCIP_PLUGINNOTFOUND, SCIP_Real, SCIP_STATUS_INFEASIBLE, SCIPcatchEvent(), SCIPdebug, SCIPdebugMsg, SCIPerrorMessage, SCIPgetBestSol(), SCIPgetNLPIterations(), SCIPgetNNodes(), SCIPgetNSols(), SCIPgetPresolvingTime(), SCIPgetStatus(), SCIPincludeEventhdlrBasic(), SCIPinfoMessage(), SCIPprintStatistics(), SCIPsolGetIndex(), SCIPsolve(), SCIPtransformProb(), SCIPtranslateSubSols(), SCIPwriteOrigProblem(), SCIPwriteParams(), setSubscipLimits(), TRUE, and updateFailureStatistic().

Referenced by SCIP_DECL_HEUREXEC().

◆ SCIP_DECL_HEURCOPY()

SCIP_DECL_HEURCOPY ( heurCopyLpface )

static

copy method for primal heuristic plugins (called when SCIP copies plugins)

Definition at line 945 of file heur_lpface.c.

References assert(), HEUR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPheurGetName(), and SCIPincludeHeurLpface().

◆ SCIP_DECL_HEURFREE()

SCIP_DECL_HEURFREE ( heurFreeLpface )

static

destructor of primal heuristic to free user data (called when SCIP is exiting)

Definition at line 959 of file heur_lpface.c.

References assert(), heurdata, NULL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPheurGetData(), and SCIPheurSetData().

◆ SCIP_DECL_HEURINIT()

SCIP_DECL_HEURINIT ( heurInitLpface )

static

initialization method of primal heuristic (called after problem was transformed)

Definition at line 979 of file heur_lpface.c.

References assert(), heurdata, NULL, SCIP_OKAY, SCIP_STATUS_UNKNOWN, and SCIPheurGetData().

◆ SCIP_DECL_HEURINITSOL()

SCIP_DECL_HEURINITSOL ( heurInitsolLpface )

static

solving process initialization method of primal heuristic (called when branch and bound process is about to begin)

Definition at line 1005 of file heur_lpface.c.

References assert(), heurdata, NULL, SCIP_CALL, SCIP_OKAY, SCIPallocBlockMemory, SCIPheurGetData(), SCIPinfinity(), and subscipdataReset().

◆ SCIP_DECL_HEUREXITSOL()

SCIP_DECL_HEUREXITSOL ( heurExitsolLpface )

static

solving process deinitialization method of primal heuristic (called before branch and bound process is exiting)

Definition at line 1030 of file heur_lpface.c.

References assert(), heurdata, NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPheurGetData(), and subscipdataFreeSubscip().

◆ SCIP_DECL_HEUREXEC()

SCIP_DECL_HEUREXEC ( heurExecLpface )

static

execution method of primal heuristic

Definition at line 1081 of file heur_lpface.c.

References assert(), calcNodeLimit(), determineVariableFixings(), heurdata, NULL, nvars, result, SCIP_Bool, SCIP_CALL, SCIP_DELAYED, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_Longint, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIPallColsInLP(), SCIPallocBufferArray, SCIPcreate(), SCIPdebug, SCIPdebugMsg, SCIPfree(), SCIPfreeBufferArray, SCIPgetCurrentNode(), SCIPgetDepth(), SCIPgetLowerbound(), SCIPgetLowerboundRoot(), SCIPgetLPObjval(), SCIPgetLPSolstat(), SCIPgetNNodes(), SCIPgetNodeLowerbound(), SCIPgetVarsData(), SCIPheurGetData(), SCIPisEQ(), SCIPisGT(), SCIPisInfinity(), SCIPisIntegral(), SCIPisLE(), SCIPisLPRelax(), SCIPisLT(), SCIPisObjIntegral(), SCIPisStopped(), SCIPnodeGetLowerbound(), SCIPnodeGetParent(), SCIPretransformObj(), setupSubscipLpface(), solveSubscipLpface(), subscipdataCopySubscip(), subscipdataFreeSubscip(), subscipdataReset(), and vars.

Detailed Description

Data Structures

Macros

Functions

Macro Definition Documentation

◆ HEUR_NAME

◆ HEUR_DESC

◆ HEUR_DISPCHAR

◆ HEUR_PRIORITY

◆ HEUR_FREQ

◆ HEUR_FREQOFS

◆ HEUR_MAXDEPTH

◆ HEUR_TIMING

◆ HEUR_USESSUBSCIP

◆ DEFAULT_MAXNODES

◆ DEFAULT_MINNODES

◆ DEFAULT_MINFIXINGRATE

◆ DEFAULT_NODESOFS

◆ DEFAULT_NODESQUOT

◆ DEFAULT_LPLIMFAC

◆ DEFAULT_USELPROWS

◆ DEFAULT_COPYCUTS

◆ DEFAULT_DUALBASISEQUATIONS

◆ DEFAULT_KEEPSUBSCIP

◆ DEFAULT_MINPATHLEN

◆ EVENTHDLR_NAME

◆ EVENTHDLR_DESC

◆ heurExitLpface

Typedef Documentation

◆ SUBSCIPDATA

Function Documentation

◆ determineVariableFixings()

◆ createRows()

◆ setupSubproblem()

◆ updateFailureStatistic()

◆ calcNodeLimit()

◆ setSubscipLimits()

◆ setSubscipParameters()

◆ subscipdataReset()

◆ subscipdataFreeSubscip()

◆ subscipdataCopySubscip()

◆ changeSubvariableObjective()

◆ SCIP_DECL_EVENTEXEC()

◆ setupSubscipLpface()

◆ solveSubscipLpface()

◆ SCIP_DECL_HEURCOPY()

◆ SCIP_DECL_HEURFREE()

◆ SCIP_DECL_HEURINIT()

◆ SCIP_DECL_HEURINITSOL()

◆ SCIP_DECL_HEUREXITSOL()

◆ SCIP_DECL_HEUREXEC()