heur_lpface.c File Reference

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_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

Typedefs
typedef struct SubscipData	SUBSCIPDATA

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 66 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface(), and solveSubscipLpface().

HEUR_DESC

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

Definition at line 67 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

HEUR_DISPCHAR

#define HEUR_DISPCHAR   SCIP_HEURDISPCHAR_LNS

Definition at line 68 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

HEUR_PRIORITY

#define HEUR_PRIORITY   -1104010

Definition at line 69 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

HEUR_FREQ

#define HEUR_FREQ   15

Definition at line 70 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

HEUR_FREQOFS

#define HEUR_FREQOFS   0

Definition at line 71 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

HEUR_MAXDEPTH

#define HEUR_MAXDEPTH   -1

Definition at line 72 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

HEUR_TIMING

#define HEUR_TIMING   SCIP_HEURTIMING_AFTERLPNODE

Definition at line 73 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

HEUR_USESSUBSCIP

#define HEUR_USESSUBSCIP   TRUE

does the heuristic use a secondary SCIP instance?

Definition at line 74 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

DEFAULT_MAXNODES

#define DEFAULT_MAXNODES   5000LL

maximum number of nodes to regard in the subproblem

Definition at line 76 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

DEFAULT_MINNODES

#define DEFAULT_MINNODES   50LL

minimum number of nodes to regard in the subproblem

Definition at line 77 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

DEFAULT_MINFIXINGRATE

#define DEFAULT_MINFIXINGRATE   0.1

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

Definition at line 78 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

DEFAULT_NODESOFS

#define DEFAULT_NODESOFS   200LL

number of nodes added to the contingent of the total nodes

Definition at line 79 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

DEFAULT_NODESQUOT

#define DEFAULT_NODESQUOT   0.1

subproblem nodes in relation to nodes of the original problem

Definition at line 80 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

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 81 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

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 82 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

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.

Referenced by SCIPincludeHeurLpface().

DEFAULT_DUALBASISEQUATIONS

#define DEFAULT_DUALBASISEQUATIONS   FALSE

should the dually nonbasic rows be turned into equations?

Definition at line 88 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 89 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 90 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

EVENTHDLR_NAME

#define EVENTHDLR_NAME   "Lpface"

Definition at line 94 of file heur_lpface.c.

Referenced by solveSubscipLpface().

EVENTHDLR_DESC

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

Definition at line 95 of file heur_lpface.c.

Referenced by solveSubscipLpface().

heurExitLpface

#define heurExitLpface   NULL

Definition at line 1067 of file heur_lpface.c.

Referenced by SCIPincludeHeurLpface().

Typedef Documentation

SUBSCIPDATA

typedef struct SubscipData SUBSCIPDATA

Definition at line 109 of file heur_lpface.c.

Function Documentation

determineVariableFixings()

static 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 149 of file heur_lpface.c.

References createRows(), MAX, NULL, REALABS, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPdebugMsg, SCIPgetColRedcost(), SCIPgetSolVal(), SCIPgetVarsData(), SCIPisDualfeasZero(), SCIPisFeasEQ(), SCIPisInfinity(), SCIPvarGetCol(), SCIPvarGetLbGlobal(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarIsIntegral(), SCIPvarIsRelaxationOnly(), and SubscipData::subscip.

createRows()

static 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 239 of file heur_lpface.c.

References FALSE, NULL, 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(), setupSubproblem(), and TRUE.

Referenced by determineVariableFixings(), and setupSubproblem().

setupSubproblem()

static 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 334 of file heur_lpface.c.

References createRows(), FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddCoefLinear(), SCIPaddCons(), SCIPcreateConsLinear(), SCIPgetLowerbound(), SCIPgetNObjVars(), SCIPgetNVars(), SCIPgetVars(), SCIPisZero(), SCIPreleaseCons(), SCIPvarGetObj(), TRUE, and updateFailureStatistic().

Referenced by createRows(), and setupSubscipLpface().

updateFailureStatistic()

static 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 383 of file heur_lpface.c.

References calcNodeLimit(), SCIP_Longint, SCIP_LONGINT_MAX, and SCIPgetNNodes().

Referenced by setupSubproblem(), and solveSubscipLpface().

calcNodeLimit()

static 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 397 of file heur_lpface.c.

References NULL, SCIP_Longint, SCIPgetNNodes(), SCIPheurGetNCalls(), and setSubscipLimits().

Referenced by setSubscipLimits(), and updateFailureStatistic().

setSubscipLimits()

static 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 429 of file heur_lpface.c.

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

Referenced by calcNodeLimit(), and solveSubscipLpface().

setSubscipParameters()

static 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 487 of file heur_lpface.c.

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

Referenced by setSubscipLimits(), and setupSubscipLpface().

subscipdataReset()

static 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 543 of file heur_lpface.c.

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

Referenced by setSubscipParameters(), and subscipdataFreeSubscip().

subscipdataFreeSubscip()

static 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 555 of file heur_lpface.c.

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

Referenced by subscipdataReset().

subscipdataCopySubscip()

static 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 584 of file heur_lpface.c.

References changeSubvariableObjective(), SubscipData::nsubvars, NULL, SubscipData::objbound, SCIP_CALL, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIPdebugMsg, SCIPduplicateBlockMemoryArray, SCIPgetCurrentNode(), SCIPgetLongintParam(), SCIPgetNNodes(), SCIPgetNodeLowerbound(), SCIPgetNVars(), SCIPgetRealParam(), SCIPgetSolvingTime(), SCIPgetStatus(), SubscipData::subscip, and SubscipData::subvars.

Referenced by subscipdataFreeSubscip().

changeSubvariableObjective()

static 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 642 of file heur_lpface.c.

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

Referenced by setupSubscipLpface(), and subscipdataCopySubscip().

SCIP_DECL_EVENTEXEC()

static 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 707 of file heur_lpface.c.

Referenced by changeSubvariableObjective().

setupSubscipLpface()

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

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 732 of file heur_lpface.c.

References changeSubvariableObjective(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIPblkmem(), SCIPcopyConsCompression(), SCIPcopyCuts(), SCIPcopyParamSettings(), SCIPcopyPlugins(), SCIPcopyVars(), SCIPcreateProbBasic(), SCIPgetProbName(), SCIPgetSubscipDepth(), SCIPhashmapCreate(), SCIPhashmapFree(), SCIPhashmapGetImage(), SCIPsetIntParam(), SCIPsetSubscipDepth(), SCIPsnprintf(), setSubscipParameters(), setupSubproblem(), solveSubscipLpface(), and TRUE.

solveSubscipLpface()

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

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 816 of file heur_lpface.c.

References EVENTHDLR_DESC, EVENTHDLR_NAME, FALSE, HEUR_NAME, NULL, SCIP_Bool, SCIP_CALL, SCIP_CALL_ABORT, SCIP_DECL_HEURCOPY(), SCIP_EVENTTYPE_LPSOLVED, SCIP_FOUNDSOL, SCIP_OKAY, SCIP_PLUGINNOTFOUND, 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 setupSubscipLpface().

SCIP_DECL_HEURCOPY()

static SCIP_DECL_HEURCOPY ( heurCopyLpface  )

static

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

Definition at line 936 of file heur_lpface.c.

Referenced by solveSubscipLpface().

SCIP_DECL_HEURFREE()

static SCIP_DECL_HEURFREE ( heurFreeLpface  )

static

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

Definition at line 950 of file heur_lpface.c.

SCIP_DECL_HEURINIT()

static SCIP_DECL_HEURINIT ( heurInitLpface  )

static

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

Definition at line 970 of file heur_lpface.c.

SCIP_DECL_HEURINITSOL()

static 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 996 of file heur_lpface.c.

SCIP_DECL_HEUREXITSOL()

static SCIP_DECL_HEUREXITSOL ( heurExitsolLpface  )

static

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

Definition at line 1021 of file heur_lpface.c.

SCIP_DECL_HEUREXEC()

static SCIP_DECL_HEUREXEC ( heurExecLpface  )

static

execution method of primal heuristic

Definition at line 1072 of file heur_lpface.c.