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Detailed Description

vanilla full strong LP branching rule

Author
Tobias Achterberg
Maxime Gasse

Definition in file branch_vanillafullstrong.c.

#include "blockmemshell/memory.h"
#include "scip/branch_vanillafullstrong.h"
#include "scip/pub_branch.h"
#include "scip/pub_message.h"
#include "scip/pub_tree.h"
#include "scip/pub_var.h"
#include "scip/scip_branch.h"
#include "scip/scip_general.h"
#include "scip/scip_lp.h"
#include "scip/scip_mem.h"
#include "scip/scip_message.h"
#include "scip/scip_numerics.h"
#include "scip/scip_param.h"
#include "scip/scip_prob.h"
#include "scip/scip_solvingstats.h"
#include "scip/scip_tree.h"
#include "scip/scip_var.h"
#include <string.h>

Go to the source code of this file.

Macros

#define BRANCHRULE_NAME   "vanillafullstrong"
 
#define BRANCHRULE_DESC   "vanilla full strong branching"
 
#define BRANCHRULE_PRIORITY   -2000
 
#define BRANCHRULE_MAXDEPTH   -1
 
#define BRANCHRULE_MAXBOUNDDIST   1.0
 
#define DEFAULT_INTEGRALCANDS   FALSE
 
#define DEFAULT_SCOREALL   FALSE
 
#define DEFAULT_IDEMPOTENT   FALSE
 
#define DEFAULT_COLLECTSCORES   FALSE
 
#define DEFAULT_DONOTBRANCH   FALSE
 

Functions

static SCIP_RETCODE runVanillaStrongBranching (SCIP *scip, SCIP_VAR **cands, int ncands, int npriocands, SCIP_Bool scoreall, SCIP_Bool idempotent, SCIP_Real *scores, int *bestcand, SCIP_Real *bestdown, SCIP_Real *bestup, SCIP_Real *bestscore, SCIP_Bool *bestdownvalid, SCIP_Bool *bestupvalid, SCIP_Real *provedbound)
 
static SCIP_DECL_BRANCHCOPY (branchCopyVanillafullstrong)
 
static SCIP_DECL_BRANCHFREE (branchFreeVanillafullstrong)
 
static SCIP_DECL_BRANCHINIT (branchInitVanillafullstrong)
 
static SCIP_DECL_BRANCHEXIT (branchExitVanillafullstrong)
 
static SCIP_DECL_BRANCHEXECLP (branchExeclpVanillafullstrong)
 
SCIP_RETCODE SCIPincludeBranchruleVanillafullstrong (SCIP *scip)
 
SCIP_RETCODE SCIPgetVanillafullstrongData (SCIP *scip, SCIP_VAR ***cands, SCIP_Real **candscores, int *ncands, int *npriocands, int *bestcand)
 

Macro Definition Documentation

◆ BRANCHRULE_NAME

#define BRANCHRULE_NAME   "vanillafullstrong"

Definition at line 54 of file branch_vanillafullstrong.c.

◆ BRANCHRULE_DESC

#define BRANCHRULE_DESC   "vanilla full strong branching"

Definition at line 55 of file branch_vanillafullstrong.c.

◆ BRANCHRULE_PRIORITY

#define BRANCHRULE_PRIORITY   -2000

Definition at line 56 of file branch_vanillafullstrong.c.

◆ BRANCHRULE_MAXDEPTH

#define BRANCHRULE_MAXDEPTH   -1

Definition at line 57 of file branch_vanillafullstrong.c.

◆ BRANCHRULE_MAXBOUNDDIST

#define BRANCHRULE_MAXBOUNDDIST   1.0

Definition at line 58 of file branch_vanillafullstrong.c.

◆ DEFAULT_INTEGRALCANDS

#define DEFAULT_INTEGRALCANDS   FALSE

should integral variables in the current LP solution be considered as branching candidates ?

Definition at line 60 of file branch_vanillafullstrong.c.

Referenced by SCIPincludeBranchruleVanillafullstrong().

◆ DEFAULT_SCOREALL

#define DEFAULT_SCOREALL   FALSE

should strong branching scores be computed for all candidates, or can we early stop when a variable has infinite score ?

Definition at line 62 of file branch_vanillafullstrong.c.

Referenced by SCIPincludeBranchruleVanillafullstrong().

◆ DEFAULT_IDEMPOTENT

#define DEFAULT_IDEMPOTENT   FALSE

should strong branching side-effects be prevented (e.g., domain changes, stat updates etc.) ?

Definition at line 64 of file branch_vanillafullstrong.c.

Referenced by SCIPincludeBranchruleVanillafullstrong().

◆ DEFAULT_COLLECTSCORES

#define DEFAULT_COLLECTSCORES   FALSE

should strong branching scores be collected ?

Definition at line 66 of file branch_vanillafullstrong.c.

Referenced by SCIPincludeBranchruleVanillafullstrong().

◆ DEFAULT_DONOTBRANCH

#define DEFAULT_DONOTBRANCH   FALSE

should branching be done ?

Definition at line 67 of file branch_vanillafullstrong.c.

Referenced by SCIPincludeBranchruleVanillafullstrong().

Function Documentation

◆ runVanillaStrongBranching()

static SCIP_RETCODE runVanillaStrongBranching ( SCIP * scip,
SCIP_VAR ** cands,
int ncands,
int npriocands,
SCIP_Bool scoreall,
SCIP_Bool idempotent,
SCIP_Real * scores,
int * bestcand,
SCIP_Real * bestdown,
SCIP_Real * bestup,
SCIP_Real * bestscore,
SCIP_Bool * bestdownvalid,
SCIP_Bool * bestupvalid,
SCIP_Real * provedbound )
static

selects a variable from a set of candidates by strong branching

Parameters
scipSCIP data structure
candsbranching candidates
ncandsnumber of branching candidates
npriocandsnumber of branching candidates with highest priority
scoreallshould strong branching scores be computed for all candidates, or can we early stop when a node is detected infeasible ?
idempotentshould strong branching side-effects be prevented (e.g., domain changes, stat updates etc.) ?
scorescandidate scores
bestcandbest candidate for branching
bestdownobjective value of the down branch for bestcand
bestupobjective value of the up branch for bestcand
bestscorescore for bestcand
bestdownvalidis bestdown a valid dual bound for the down branch?
bestupvalidis bestup a valid dual bound for the up branch?
provedboundproved dual bound for current subtree

Definition at line 97 of file branch_vanillafullstrong.c.

References assert(), bestcand, c, FALSE, lperror, MAX, MIN, NULL, SCIP_Bool, SCIP_CALL, SCIP_LONGINT_FORMAT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIP_VERBLEVEL_HIGH, SCIPallColsInLP(), SCIPdebugMsg, SCIPendStrongbranch(), SCIPfrac(), SCIPgetBranchScoreMultiple(), SCIPgetCutoffbound(), SCIPgetDepth(), SCIPgetLPObjval(), SCIPgetLPSolstat(), SCIPgetNNodes(), SCIPgetVarStrongbranchFrac(), SCIPgetVarStrongbranchInt(), SCIPinfinity(), SCIPisExactSolve(), SCIPisFeasIntegral(), SCIPisGE(), SCIPisStopped(), SCIPprintDisplayLine(), SCIPstartStrongbranch(), SCIPupdateVarPseudocost(), SCIPvarGetLPSol(), SCIPvarGetName(), SCIPverbMessage(), TRUE, and var.

Referenced by SCIP_DECL_BRANCHEXECLP().

◆ SCIP_DECL_BRANCHCOPY()

static SCIP_DECL_BRANCHCOPY ( branchCopyVanillafullstrong )
static

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

Definition at line 295 of file branch_vanillafullstrong.c.

References assert(), BRANCHRULE_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPbranchruleGetName(), and SCIPincludeBranchruleVanillafullstrong().

◆ SCIP_DECL_BRANCHFREE()

static SCIP_DECL_BRANCHFREE ( branchFreeVanillafullstrong )
static

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

Definition at line 309 of file branch_vanillafullstrong.c.

References assert(), NULL, SCIP_OKAY, SCIPbranchruleGetData(), and SCIPfreeBlockMemoryNull.

◆ SCIP_DECL_BRANCHINIT()

static SCIP_DECL_BRANCHINIT ( branchInitVanillafullstrong )
static

initialization method of branching rule (called after problem was transformed)

Definition at line 324 of file branch_vanillafullstrong.c.

References assert(), NULL, SCIP_OKAY, and SCIPbranchruleGetData().

◆ SCIP_DECL_BRANCHEXIT()

static SCIP_DECL_BRANCHEXIT ( branchExitVanillafullstrong )
static

deinitialization method of branching rule (called before transformed problem is freed)

Definition at line 341 of file branch_vanillafullstrong.c.

References assert(), NULL, SCIP_OKAY, SCIPbranchruleGetData(), and SCIPfreeBlockMemoryArrayNull.

◆ SCIP_DECL_BRANCHEXECLP()

◆ SCIPgetVanillafullstrongData()

SCIP_RETCODE SCIPgetVanillafullstrongData ( SCIP * scip,
SCIP_VAR *** cands,
SCIP_Real ** candscores,
int * ncands,
int * npriocands,
int * bestcand )

recovers candidate variables and their scores from last vanilla full strong branching call

Parameters
scipSCIP data structure
candspointer to store candidate variables; or NULL
candscorespointer to store candidate scores; or NULL
ncandspointer to store number of candidates; or NULL
npriocandspointer to store number of priority candidates; or NULL
bestcandpointer to store best branching candidate; or NULL

Definition at line 581 of file branch_vanillafullstrong.c.

References assert(), bestcand, BRANCHRULE_NAME, NULL, SCIP_OKAY, SCIP_Real, SCIPbranchruleGetData(), and SCIPfindBranchrule().