branch_relpscost.c File Reference

Detailed Description

reliable pseudo costs branching rule

Author

Tobias Achterberg

Timo Berthold

Gerald Gamrath

Definition in file branch_relpscost.c.

#include <assert.h>
#include <string.h>
#include "scip/branch_relpscost.h"
#include "scip/cons_and.h"

Go to the source code of this file.

Macros
#define	BRANCHRULE_NAME   "relpscost"
#define	BRANCHRULE_DESC   "reliability branching on pseudo cost values"
#define	BRANCHRULE_PRIORITY   10000
#define	BRANCHRULE_MAXDEPTH   -1
#define	BRANCHRULE_MAXBOUNDDIST   1.0
#define	DEFAULT_CONFLICTWEIGHT   0.01
#define	DEFAULT_CONFLENGTHWEIGHT   0.0
#define	DEFAULT_INFERENCEWEIGHT   0.0001
#define	DEFAULT_CUTOFFWEIGHT   0.0001
#define	DEFAULT_PSCOSTWEIGHT   1.0
#define	DEFAULT_NLSCOREWEIGHT   0.1
#define	DEFAULT_MINRELIABLE   1.0
#define	DEFAULT_MAXRELIABLE   5.0
#define	DEFAULT_SBITERQUOT   0.5
#define	DEFAULT_SBITEROFS   100000
#define	DEFAULT_MAXLOOKAHEAD   9
#define	DEFAULT_INITCAND   100
#define	DEFAULT_INITITER   0
#define	DEFAULT_MAXBDCHGS   5
#define	DEFAULT_MAXPROPROUNDS   -2
#define	DEFAULT_PROBINGBOUNDS   TRUE
#define	DEFAULT_USERELERRORFORRELIABILITY   FALSE
#define	DEFAULT_LOWERRORTOL   0.05
#define	DEFAULT_HIGHERRORTOL   1.0
#define	DEFAULT_USEHYPTESTFORRELIABILITY   FALSE
#define	DEFAULT_USEDYNAMICCONFIDENCE   FALSE
#define	DEFAULT_STORESEMIINITCOSTS   FALSE
#define	DEFAULT_USESBLOCALINFO   FALSE
#define	DEFAULT_CONFIDENCELEVEL   2
#define	DEFAULT_SKIPBADINITCANDS   TRUE
#define	DEFAULT_STARTRANDSEED   12345
#define	DEFAULT_RANDINITORDER   FALSE

Functions
static SCIP_RETCODE	binvarGetActiveProbindex (SCIP *scip, SCIP_VAR *var, int *probindex)
static SCIP_RETCODE	countNonlinearities (SCIP *scip, int *nlcount, int nlcountsize, int *nlcountmax)
static SCIP_RETCODE	branchruledataEnsureNlcount (SCIP *scip, SCIP_BRANCHRULEDATA *branchruledata)
static SCIP_Real	calcNlscore (SCIP *scip, int *nlcount, int nlcountmax, int probindex)
static SCIP_Real	calcScore (SCIP *scip, SCIP_BRANCHRULEDATA *branchruledata, SCIP_Real conflictscore, SCIP_Real avgconflictscore, SCIP_Real conflengthscore, SCIP_Real avgconflengthscore, SCIP_Real inferencescore, SCIP_Real avginferencescore, SCIP_Real cutoffscore, SCIP_Real avgcutoffscore, SCIP_Real pscostscore, SCIP_Real avgpscostscore, SCIP_Real nlscore, SCIP_Real frac)
static SCIP_RETCODE	addBdchg (SCIP *scip, int **bdchginds, SCIP_BOUNDTYPE **bdchgtypes, SCIP_Real **bdchgbounds, int *nbdchgs, int ind, SCIP_BOUNDTYPE type, SCIP_Real bound)
static void	freeBdchgs (SCIP *scip, int **bdchginds, SCIP_BOUNDTYPE **bdchgtypes, SCIP_Real **bdchgbounds, int *nbdchgs)
static SCIP_RETCODE	applyBdchgs (SCIP *scip, SCIP_VAR **vars, int *bdchginds, SCIP_BOUNDTYPE *bdchgtypes, SCIP_Real *bdchgbounds, int nbdchgs, SCIP_RESULT *result)
static SCIP_RETCODE	execRelpscost (SCIP *scip, SCIP_BRANCHRULE *branchrule, SCIP_Bool allowaddcons, SCIP_VAR **branchcands, SCIP_Real *branchcandssol, SCIP_Real *branchcandsfrac, int nbranchcands, SCIP_Bool executebranch, SCIP_RESULT *result)
static	SCIP_DECL_BRANCHCOPY (branchCopyRelpscost)
static	SCIP_DECL_BRANCHFREE (branchFreeRelpscost)
static	SCIP_DECL_BRANCHINITSOL (branchInitsolRelpscost)
static	SCIP_DECL_BRANCHEXITSOL (branchExitsolRelpscost)
static	SCIP_DECL_BRANCHEXECLP (branchExeclpRelpscost)
SCIP_RETCODE	SCIPincludeBranchruleRelpscost (SCIP *scip)
SCIP_RETCODE	SCIPexecRelpscostBranching (SCIP *scip, SCIP_Bool allowaddcons, SCIP_VAR **branchcands, SCIP_Real *branchcandssol, SCIP_Real *branchcandsfrac, int nbranchcands, SCIP_Bool executebranching, SCIP_RESULT *result)

Macro Definition Documentation

#define BRANCHRULE_NAME   "relpscost"

Definition at line 31 of file branch_relpscost.c.

Referenced by applyBdchgs(), SCIPexecRelpscostBranching(), and SCIPincludeBranchruleRelpscost().

#define BRANCHRULE_DESC   "reliability branching on pseudo cost values"

Definition at line 32 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define BRANCHRULE_PRIORITY   10000

Definition at line 33 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define BRANCHRULE_MAXDEPTH   -1

Definition at line 34 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define BRANCHRULE_MAXBOUNDDIST   1.0

Definition at line 35 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_CONFLICTWEIGHT   0.01

weight in score calculations for conflict score

Definition at line 37 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_CONFLENGTHWEIGHT   0.0

weight in score calculations for conflict length score

Definition at line 38 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_INFERENCEWEIGHT   0.0001

weight in score calculations for inference score

Definition at line 39 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_CUTOFFWEIGHT   0.0001

weight in score calculations for cutoff score

Definition at line 40 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_PSCOSTWEIGHT   1.0

weight in score calculations for pseudo cost score

Definition at line 41 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_NLSCOREWEIGHT   0.1

weight in score calculations for nlcount score

Definition at line 42 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_MINRELIABLE   1.0

minimal value for minimum pseudo cost size to regard pseudo cost value as reliable

Definition at line 43 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_MAXRELIABLE   5.0

maximal value for minimum pseudo cost size to regard pseudo cost value as reliable

Definition at line 44 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_SBITERQUOT   0.5

maximal fraction of strong branching LP iterations compared to normal iterations

Definition at line 45 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_SBITEROFS   100000

additional number of allowed strong branching LP iterations

Definition at line 46 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_MAXLOOKAHEAD   9

maximal number of further variables evaluated without better score

Definition at line 47 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_INITCAND   100

maximal number of candidates initialized with strong branching per node

Definition at line 48 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_INITITER   0

iteration limit for strong branching initialization of pseudo cost entries (0: auto)

Definition at line 49 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_MAXBDCHGS   5

maximal number of bound tightenings before the node is reevaluated (-1: unlimited)

Definition at line 50 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_MAXPROPROUNDS   -2

maximum number of propagation rounds to be performed during strong branching before solving the LP (-1: no limit, -2: parameter settings)

Definition at line 51 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_PROBINGBOUNDS   TRUE

should valid bounds be identified in a probing-like fashion during strong branching (only with propagation)?

Definition at line 54 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_USERELERRORFORRELIABILITY   FALSE

should reliability be based on relative errors?

Definition at line 57 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_LOWERRORTOL   0.05

lowest tolerance beneath which relative errors are reliable

Definition at line 58 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_HIGHERRORTOL   1.0

highest tolerance beneath which relative errors are reliable

Definition at line 59 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_USEHYPTESTFORRELIABILITY   FALSE

should the strong branching decision be based on a hypothesis test?

Definition at line 60 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_USEDYNAMICCONFIDENCE   FALSE

should the confidence level be adjusted dynamically?

Definition at line 61 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_STORESEMIINITCOSTS   FALSE

should strong branching result be considered for pseudo costs if the other direction was infeasible?

Definition at line 62 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_USESBLOCALINFO   FALSE

should the scoring function use only local cutoff and inference information obtained for strong branching candidates?

Definition at line 63 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_CONFIDENCELEVEL   2

The confidence level for statistical methods, between 0 (Min) and 4 (Max).

Definition at line 64 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_SKIPBADINITCANDS   TRUE

should branching rule skip candidates that have a low probability to be better than the best strong-branching or pseudo-candidate?

Definition at line 65 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_STARTRANDSEED   12345

start random seed for random number generation

Definition at line 68 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

#define DEFAULT_RANDINITORDER   FALSE

should candidates be initialized in randomized order?

Definition at line 69 of file branch_relpscost.c.

Referenced by SCIPincludeBranchruleRelpscost().

Function Documentation

static SCIP_RETCODE binvarGetActiveProbindex ( SCIP *  scip, SCIP_VAR *  var, int *  probindex  )

static

return probindex of variable or corresponding active variable (if negated or aggregated) or -1 (if multiaggregated)

Parameters

scip	SCIP data structure
var	binary variable
probindex	buffer to store probindex

Definition at line 118 of file branch_relpscost.c.

References countNonlinearities(), NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_FIXED, SCIPgetBinvarRepresentative(), SCIPvarGetNegationVar(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIPvarIsActive(), SCIPvarIsBinary(), and SCIPvarIsNegated().

Referenced by countNonlinearities().

static SCIP_RETCODE countNonlinearities ( SCIP *  scip, int *  nlcount, int  nlcountsize, int *  nlcountmax  )

static

counts number of nonlinear constraints in which each variable appears

Parameters

scip	SCIP data structure
nlcount	pointer to array for storing count values
nlcountsize	buffer for storing length of nlcount array
nlcountmax	buffer for storing maximum value in nlcount array

Definition at line 152 of file branch_relpscost.c.

References binvarGetActiveProbindex(), BMSclearMemoryArray, branchruledataEnsureNlcount(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_FIXED, SCIPconshdlrGetConss(), SCIPconshdlrGetNActiveConss(), SCIPfindConshdlr(), SCIPgetNLPVarsNonlinearity(), SCIPgetNNLPVars(), SCIPgetNVarsAnd(), SCIPgetResultantAnd(), SCIPgetVarsAnd(), SCIPgetVarsData(), SCIPisNLPConstructed(), and SCIPvarGetStatus().

Referenced by binvarGetActiveProbindex(), and branchruledataEnsureNlcount().

static SCIP_RETCODE branchruledataEnsureNlcount ( SCIP *  scip, SCIP_BRANCHRULEDATA *  branchruledata  )

static

Parameters

scip	SCIP data structure
branchruledata	branching rule data

Definition at line 235 of file branch_relpscost.c.

References BMSclearMemoryArray, calcNlscore(), countNonlinearities(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBlockMemoryArray, SCIPfreeBlockMemoryArrayNull, SCIPgetNVars(), and SCIPreallocBlockMemoryArray.

Referenced by countNonlinearities(), and execRelpscost().

static SCIP_Real calcNlscore ( SCIP *  scip, int *  nlcount, int  nlcountmax, int  probindex  )

static

calculates nlscore value between 0 and 1

Parameters

scip	SCIP data structure
nlcount	array to store count values
nlcountmax	maximum value in nlcount array
probindex	index of branching candidate

Definition at line 282 of file branch_relpscost.c.

References calcScore(), NULL, SCIP_Real, and SCIPgetNVars().

Referenced by branchruledataEnsureNlcount(), and execRelpscost().

static SCIP_Real calcScore ( SCIP *  scip, SCIP_BRANCHRULEDATA *  branchruledata, SCIP_Real  conflictscore, SCIP_Real  avgconflictscore, SCIP_Real  conflengthscore, SCIP_Real  avgconflengthscore, SCIP_Real  inferencescore, SCIP_Real  avginferencescore, SCIP_Real  cutoffscore, SCIP_Real  avgcutoffscore, SCIP_Real  pscostscore, SCIP_Real  avgpscostscore, SCIP_Real  nlscore, SCIP_Real  frac  )

static

calculates an overall score value for the given individual score values

Parameters

scip	SCIP data structure
branchruledata	branching rule data
conflictscore	conflict score of current variable
avgconflictscore	average conflict score
conflengthscore	conflict length score of current variable
avgconflengthscore	average conflict length score
inferencescore	inference score of current variable
avginferencescore	average inference score
cutoffscore	cutoff score of current variable
avgcutoffscore	average cutoff score
pscostscore	pscost score of current variable
avgpscostscore	average pscost score
nlscore	nonlinear score of current variable between 0 and 1
frac	fractional value of variable in current solution

Definition at line 309 of file branch_relpscost.c.

References addBdchg(), MIN, NULL, SCIP_Real, and SCIPfeastol().

Referenced by calcNlscore(), and execRelpscost().

static SCIP_RETCODE addBdchg ( SCIP *  scip, int **  bdchginds, SCIP_BOUNDTYPE **  bdchgtypes, SCIP_Real **  bdchgbounds, int *  nbdchgs, int  ind, SCIP_BOUNDTYPE  type, SCIP_Real  bound  )

static

adds given index and direction to bound change arrays

Parameters

scip	SCIP data structure
bdchginds	pointer to bound change index array
bdchgtypes	pointer to bound change types array
bdchgbounds	pointer to bound change new bounds array
nbdchgs	pointer to number of bound changes
ind	index to store in bound change index array
type	type of the bound change to store in bound change type array
bound	new bound to store in bound change new bounds array

Definition at line 347 of file branch_relpscost.c.

References freeBdchgs(), NULL, SCIP_CALL, SCIP_OKAY, and SCIPreallocBufferArray.

Referenced by calcScore(), and execRelpscost().

static void freeBdchgs ( SCIP *  scip, int **  bdchginds, SCIP_BOUNDTYPE **  bdchgtypes, SCIP_Real **  bdchgbounds, int *  nbdchgs  )

static

frees bound change arrays

Parameters

scip	SCIP data structure
bdchginds	pointer to bound change index array
bdchgtypes	pointer to bound change types array
bdchgbounds	pointer to bound change new bounds array
nbdchgs	pointer to number of bound changes

Definition at line 380 of file branch_relpscost.c.

References applyBdchgs(), NULL, and SCIPfreeBufferArrayNull.

Referenced by addBdchg(), and execRelpscost().

static SCIP_RETCODE applyBdchgs ( SCIP *  scip, SCIP_VAR **  vars, int *  bdchginds, SCIP_BOUNDTYPE *  bdchgtypes, SCIP_Real *  bdchgbounds, int  nbdchgs, SCIP_RESULT *  result  )

static

applies bound changes stored in bound change arrays

Parameters

scip	SCIP data structure
vars	problem variables
bdchginds	bound change index array
bdchgtypes	bound change types array
bdchgbounds	bound change new bound array
nbdchgs	number of bound changes
result	result pointer

Definition at line 401 of file branch_relpscost.c.

References BRANCHRULE_NAME, execRelpscost(), NULL, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_CUTOFF, SCIP_OKAY, SCIPbranchruleGetData(), SCIPdebugMessage, SCIPfindBranchrule(), SCIPtightenVarLb(), SCIPtightenVarUb(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetUbLocal(), and TRUE.

Referenced by execRelpscost(), and freeBdchgs().

static SCIP_RETCODE execRelpscost ( SCIP *  scip, SCIP_BRANCHRULE *  branchrule, SCIP_Bool  allowaddcons, SCIP_VAR **  branchcands, SCIP_Real *  branchcandssol, SCIP_Real *  branchcandsfrac, int  nbranchcands, SCIP_Bool  executebranch, SCIP_RESULT *  result  )

static

execute reliability pseudo cost branching

Parameters

scip	SCIP data structure
branchrule	branching rule
allowaddcons	is the branching rule allowed to add constraints to the current node in order to cut off the current solution instead of creating a branching?
branchcands	branching candidates
branchcandssol	solution value for the branching candidates
branchcandsfrac	fractional part of the branching candidates
nbranchcands	number of branching candidates
executebranch	execute a branching step or run probing only
result	pointer to the result of the execution

Definition at line 478 of file branch_relpscost.c.

References addBdchg(), applyBdchgs(), branchruledataEnsureNlcount(), calcNlscore(), calcScore(), FALSE, freeBdchgs(), MAX, MIN, NULL, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, SCIP_BRANCHED, SCIP_CALL, SCIP_CONFIDENCELEVEL_HIGH, SCIP_CONFIDENCELEVEL_LOW, SCIP_CONFIDENCELEVEL_MAX, SCIP_CONFIDENCELEVEL_MEDIUM, SCIP_CONFIDENCELEVEL_MIN, SCIP_CONSADDED, SCIP_CUTOFF, SCIP_DECL_BRANCHCOPY(), SCIP_DIDNOTRUN, SCIP_INVALID, SCIP_Longint, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIP_REDUCEDDOM, SCIP_VERBLEVEL_HIGH, SCIPallColsInLP(), SCIPallocBufferArray, SCIPbranchruleGetData(), SCIPbranchVarVal(), SCIPdebugMessage, SCIPendStrongbranch(), SCIPfeasCeil(), SCIPfeasFloor(), SCIPfreeBufferArray, SCIPgetAvgConflictlengthScore(), SCIPgetAvgConflictScore(), SCIPgetAvgCutoffScore(), SCIPgetAvgInferenceScore(), SCIPgetAvgPseudocostScore(), SCIPgetBestSol(), SCIPgetBranchScore(), SCIPgetCurrentNode(), SCIPgetCutoffbound(), SCIPgetLPObjval(), SCIPgetLPSolstat(), SCIPgetNDualResolveLPIterations(), SCIPgetNDualResolveLPs(), SCIPgetNNodeInitLPIterations(), SCIPgetNNodeInitLPs(), SCIPgetNNodeLPIterations(), SCIPgetNNodes(), SCIPgetNodeLowerbound(), SCIPgetNRootStrongbranchLPIterations(), SCIPgetNStrongbranchLPIterations(), SCIPgetNVars(), SCIPgetRandomReal(), SCIPgetVarAvgCutoffScore(), SCIPgetVarAvgInferenceScore(), SCIPgetVarConflictlengthScore(), SCIPgetVarConflictScore(), SCIPgetVarPseudocostCountCurrentRun(), SCIPgetVarPseudocostCurrentRun(), SCIPgetVarPseudocostScore(), SCIPgetVarPseudocostScoreCurrentRun(), SCIPgetVars(), SCIPgetVarStrongbranchFrac(), SCIPgetVarStrongbranchLast(), SCIPgetVarStrongbranchNode(), SCIPgetVarStrongbranchWithPropagation(), SCIPhasCurrentNodeLP(), SCIPinfinity(), SCIPisExactSolve(), SCIPisFeasIntegral(), SCIPisGE(), SCIPisGT(), SCIPisLPSolBasic(), SCIPisLT(), SCIPisStopped(), SCIPisSumGE(), SCIPisSumGT(), SCIPisVarPscostRelerrorReliable(), SCIPnodeGetLowerbound(), SCIPpscostThresholdProbabilityTest(), SCIPsignificantVarPscostDifference(), SCIPsolGetIndex(), SCIPstartStrongbranch(), SCIPupdateNodeLowerbound(), SCIPupdateVarPseudocost(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetProbindex(), SCIPvarGetUbLocal(), SCIPverbMessage(), and TRUE.

Referenced by applyBdchgs(), and SCIPexecRelpscostBranching().

static SCIP_DECL_BRANCHCOPY ( branchCopyRelpscost  )

static

copy method for branchrule plugins (called when SCIP copies plugins)

Definition at line 1423 of file branch_relpscost.c.

Referenced by execRelpscost().

static SCIP_DECL_BRANCHFREE ( branchFreeRelpscost  )

static

destructor of branching rule to free user data (called when SCIP is exiting)

Definition at line 1437 of file branch_relpscost.c.

static SCIP_DECL_BRANCHINITSOL ( branchInitsolRelpscost  )

static

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

Definition at line 1452 of file branch_relpscost.c.

static SCIP_DECL_BRANCHEXITSOL ( branchExitsolRelpscost  )

static

solving process deinitialization method of branching rule (called before branch and bound process data is freed)

Definition at line 1470 of file branch_relpscost.c.

static SCIP_DECL_BRANCHEXECLP ( branchExeclpRelpscost  )

static

branching execution method for fractional LP solutions

Definition at line 1484 of file branch_relpscost.c.

SCIP_RETCODE SCIPincludeBranchruleRelpscost

(

SCIP *

scip

)

creates the reliable pseudo cost branching rule and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 1528 of file branch_relpscost.c.

References BRANCHRULE_DESC, BRANCHRULE_MAXBOUNDDIST, BRANCHRULE_MAXDEPTH, BRANCHRULE_NAME, BRANCHRULE_PRIORITY, DEFAULT_CONFIDENCELEVEL, DEFAULT_CONFLENGTHWEIGHT, DEFAULT_CONFLICTWEIGHT, DEFAULT_CUTOFFWEIGHT, DEFAULT_HIGHERRORTOL, DEFAULT_INFERENCEWEIGHT, DEFAULT_INITCAND, DEFAULT_INITITER, DEFAULT_LOWERRORTOL, DEFAULT_MAXBDCHGS, DEFAULT_MAXLOOKAHEAD, DEFAULT_MAXPROPROUNDS, DEFAULT_MAXRELIABLE, DEFAULT_MINRELIABLE, DEFAULT_NLSCOREWEIGHT, DEFAULT_PROBINGBOUNDS, DEFAULT_PSCOSTWEIGHT, DEFAULT_RANDINITORDER, DEFAULT_SBITEROFS, DEFAULT_SBITERQUOT, DEFAULT_SKIPBADINITCANDS, DEFAULT_STARTRANDSEED, DEFAULT_STORESEMIINITCOSTS, DEFAULT_USEDYNAMICCONFIDENCE, DEFAULT_USEHYPTESTFORRELIABILITY, DEFAULT_USERELERRORFORRELIABILITY, DEFAULT_USESBLOCALINFO, FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_REAL_MAX, SCIP_REAL_MIN, SCIPaddBoolParam(), SCIPaddIntParam(), SCIPaddRealParam(), SCIPallocMemory, SCIPexecRelpscostBranching(), SCIPincludeBranchruleBasic(), SCIPsetBranchruleCopy(), SCIPsetBranchruleExecLp(), SCIPsetBranchruleExitsol(), SCIPsetBranchruleFree(), SCIPsetBranchruleInitsol(), and TRUE.

Referenced by SCIPincludeDefaultPlugins().

SCIP_RETCODE SCIPexecRelpscostBranching	(	SCIP *	scip,
		SCIP_Bool	allowaddcons,
		SCIP_VAR **	branchcands,
		SCIP_Real *	branchcandssol,
		SCIP_Real *	branchcandsfrac,
		int	nbranchcands,
		SCIP_Bool	executebranching,
		SCIP_RESULT *	result
	)

execution reliability pseudo cost branching with the given branching candidates

Parameters

scip	SCIP data structure
allowaddcons	is the branching rule allowed to add constraints to the current node in order to cut off the current solution instead of creating a branching?
branchcands	branching candidates
branchcandssol	solution value for the branching candidates
branchcandsfrac	fractional part of the branching candidates
nbranchcands	number of branching candidates
executebranching	perform a branching step after probing
result	pointer to the result of the execution

Definition at line 1667 of file branch_relpscost.c.

References BRANCHRULE_NAME, execRelpscost(), NULL, SCIP_CALL, SCIP_OKAY, and SCIPfindBranchrule().

Referenced by SCIP_DECL_BRANCHEXECLP(), and SCIPincludeBranchruleRelpscost().