branch_multinode.c File Reference

Detailed Description

mutlinode branching rule for the set-partitioning part in cycle clustering application.

Author

Leon Eifler

Definition in file branch_multinode.c.

#include <assert.h>
#include "branch_multinode.h"
#include "probdata_cyc.h"
#include "scip/branch_relpscost.h"

Go to the source code of this file.

Macros
#define	BRANCHRULE_NAME   "multinode"
#define	BRANCHRULE_DESC   "multinode branching creates a child for every variable of a setpartitioning constraint"
#define	BRANCHRULE_PRIORITY   10000000
#define	BRANCHRULE_MAXDEPTH   -1
#define	BRANCHRULE_MAXBOUNDDIST   1.0

Functions
static SCIP_RETCODE	getBranchCands (SCIP *scip, SCIP_VAR **branchcands, SCIP_Real *branchcandssol, SCIP_Real *branchcandsfrac, int *ncands)
static SCIP_RETCODE	branchOnBin (SCIP *scip, int row, SCIP_RESULT *result)
static	SCIP_DECL_BRANCHEXECLP (branchExeclpMultinode)
SCIP_RETCODE	SCIPincludeBranchruleMultinode (SCIP *scip)

Macro Definition Documentation

BRANCHRULE_NAME

#define BRANCHRULE_NAME   "multinode"

Definition at line 40 of file branch_multinode.c.

BRANCHRULE_DESC

#define BRANCHRULE_DESC   "multinode branching creates a child for every variable of a setpartitioning constraint"

Definition at line 41 of file branch_multinode.c.

BRANCHRULE_PRIORITY

#define BRANCHRULE_PRIORITY   10000000

Definition at line 42 of file branch_multinode.c.

BRANCHRULE_MAXDEPTH

#define BRANCHRULE_MAXDEPTH   -1

Definition at line 43 of file branch_multinode.c.

BRANCHRULE_MAXBOUNDDIST

#define BRANCHRULE_MAXBOUNDDIST   1.0

Definition at line 44 of file branch_multinode.c.

Function Documentation

getBranchCands()

static SCIP_RETCODE getBranchCands ( SCIP *  scip, SCIP_VAR **  branchcands, SCIP_Real *  branchcandssol, SCIP_Real *  branchcandsfrac, int *  ncands  )

static

get the branching candidates viable for multinode branching

Parameters

scip	SCIP data structure
branchcands	the address of the branching candidates
branchcandssol	pointer to solution values of the candidates
branchcandsfrac	pointer to fractionalities of the candidates
ncands	number of branching candidates

Definition at line 54 of file branch_multinode.c.

References MAX, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIPcycGetBinvars(), SCIPcycGetNBins(), SCIPcycGetNCluster(), SCIPisFeasIntegral(), SCIPvarGetLPSol(), and SCIPvarGetStatus().

Referenced by SCIP_DECL_BRANCHEXECLP().

branchOnBin()

static SCIP_RETCODE branchOnBin ( SCIP *  scip, int  row, SCIP_RESULT *  result  )

static

branch on a selected bin -> Create at most |Cluster| children

Parameters

scip	SCIP data structure
row	the row in the binvar-matrix (not lp-row) to be branched on
result	pointer to store result of branching

Definition at line 93 of file branch_multinode.c.

References MIN, NULL, SCIP_Bool, SCIP_BRANCHDIR_UPWARDS, SCIP_BRANCHED, SCIP_CALL, SCIP_INVALID, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIPallocClearBufferArray, SCIPcalcChildEstimate(), SCIPcalcNodeselPriority(), SCIPchgVarLbNode(), SCIPchgVarUbNode(), SCIPcreateChild(), SCIPcycGetBinvars(), SCIPcycGetNCluster(), SCIPfreeBufferArray, SCIPisEQ(), SCIPisZero(), SCIPvarGetLPSol(), SCIPvarGetStatus(), and TRUE.

Referenced by SCIP_DECL_BRANCHEXECLP().

SCIP_DECL_BRANCHEXECLP()

static SCIP_DECL_BRANCHEXECLP ( branchExeclpMultinode  )

static

branching execution method for fractional LP solutions

Definition at line 167 of file branch_multinode.c.

References branchOnBin(), FALSE, getBranchCands(), SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTRUN, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIP_REDUCEDDOM, SCIP_VARSTATUS_COLUMN, SCIPallocClearBufferArray, SCIPcycGetBinvars(), SCIPcycGetNBins(), SCIPcycGetNCluster(), SCIPexecRelpscostBranching(), SCIPfreeBufferArray, SCIPgetVarPseudocostScore(), SCIPinfinity(), SCIPisEQ(), SCIPisInfinity(), SCIPisLT(), SCIPisZero(), SCIPvarGetLbLocal(), SCIPvarGetLPSol(), SCIPvarGetStatus(), and SCIPvarGetUbLocal().

SCIPincludeBranchruleMultinode()

SCIP_RETCODE SCIPincludeBranchruleMultinode

(

SCIP *

scip

)

creates the mutlinode branching rule and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 261 of file branch_multinode.c.

References BRANCHRULE_DESC, BRANCHRULE_MAXBOUNDDIST, BRANCHRULE_MAXDEPTH, BRANCHRULE_NAME, BRANCHRULE_PRIORITY, NULL, SCIP_CALL, SCIP_OKAY, SCIPincludeBranchruleBasic(), and SCIPsetBranchruleExecLp().

Referenced by SCIPincludeCycPlugins().