heur_coefdiving.c File Reference

Detailed Description

LP diving heuristic that chooses fixings w.r.t. the matrix coefficients.

Author

Tobias Achterberg

Marc Pfetsch

Indicator constraints are taken into account if present.

Definition in file heur_coefdiving.c.

#include <assert.h>
#include <string.h>
#include "scip/heur_coefdiving.h"

Go to the source code of this file.

Macros
#define	HEUR_NAME   "coefdiving"
#define	HEUR_DESC   "LP diving heuristic that chooses fixings w.r.t. the matrix coefficients"
#define	HEUR_DISPCHAR   'c'
#define	HEUR_PRIORITY   -1001000
#define	HEUR_FREQ   10
#define	HEUR_FREQOFS   1
#define	HEUR_MAXDEPTH   -1
#define	HEUR_TIMING   SCIP_HEURTIMING_AFTERLPPLUNGE
#define	HEUR_USESSUBSCIP   FALSE
#define	DIVESET_DIVETYPES   SCIP_DIVETYPE_INTEGRALITY | SCIP_DIVETYPE_SOS1VARIABLE
#define	DEFAULT_MINRELDEPTH   0.0
#define	DEFAULT_MAXRELDEPTH   1.0
#define	DEFAULT_MAXLPITERQUOT   0.05
#define	DEFAULT_MAXLPITEROFS   1000
#define	DEFAULT_MAXDIVEUBQUOT   0.8
#define	DEFAULT_MAXDIVEAVGQUOT   0.0
#define	DEFAULT_MAXDIVEUBQUOTNOSOL   0.1
#define	DEFAULT_MAXDIVEAVGQUOTNOSOL   0.0
#define	DEFAULT_BACKTRACK   TRUE
#define	DEFAULT_LPRESOLVEDOMCHGQUOT   0.15
#define	DEFAULT_LPSOLVEFREQ   0
#define	DEFAULT_ONLYLPBRANCHCANDS   FALSE
#define	DEFAULT_RANDSEED   83

Functions
static	SCIP_DECL_HEURCOPY (heurCopyCoefdiving)
static	SCIP_DECL_HEURFREE (heurFreeCoefdiving)
static	SCIP_DECL_HEURINIT (heurInitCoefdiving)
static	SCIP_DECL_HEUREXIT (heurExitCoefdiving)
static	SCIP_DECL_HEUREXEC (heurExecCoefdiving)
static	SCIP_DECL_DIVESETGETSCORE (divesetGetScoreCoefdiving)
SCIP_RETCODE	SCIPincludeHeurCoefdiving (SCIP *scip)

Macro Definition Documentation

HEUR_NAME

#define HEUR_NAME   "coefdiving"

Definition at line 31 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

HEUR_DESC

#define HEUR_DESC   "LP diving heuristic that chooses fixings w.r.t. the matrix coefficients"

Definition at line 32 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

HEUR_DISPCHAR

#define HEUR_DISPCHAR   'c'

Definition at line 33 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

HEUR_PRIORITY

#define HEUR_PRIORITY   -1001000

Definition at line 34 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

HEUR_FREQ

#define HEUR_FREQ   10

Definition at line 35 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

HEUR_FREQOFS

#define HEUR_FREQOFS   1

Definition at line 36 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

HEUR_MAXDEPTH

#define HEUR_MAXDEPTH   -1

Definition at line 37 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

HEUR_TIMING

#define HEUR_TIMING   SCIP_HEURTIMING_AFTERLPPLUNGE

Definition at line 38 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

HEUR_USESSUBSCIP

#define HEUR_USESSUBSCIP   FALSE

does the heuristic use a secondary SCIP instance?

Definition at line 39 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DIVESET_DIVETYPES

#define DIVESET_DIVETYPES   SCIP_DIVETYPE_INTEGRALITY | SCIP_DIVETYPE_SOS1VARIABLE

bit mask that represents all supported dive types

Definition at line 40 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_MINRELDEPTH

#define DEFAULT_MINRELDEPTH   0.0

minimal relative depth to start diving

Definition at line 47 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_MAXRELDEPTH

#define DEFAULT_MAXRELDEPTH   1.0

maximal relative depth to start diving

Definition at line 48 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_MAXLPITERQUOT

#define DEFAULT_MAXLPITERQUOT   0.05

maximal fraction of diving LP iterations compared to node LP iterations

Definition at line 49 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_MAXLPITEROFS

#define DEFAULT_MAXLPITEROFS   1000

additional number of allowed LP iterations

Definition at line 50 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_MAXDIVEUBQUOT

#define DEFAULT_MAXDIVEUBQUOT   0.8

maximal quotient (curlowerbound - lowerbound)/(cutoffbound - lowerbound) where diving is performed (0.0: no limit)

Definition at line 51 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_MAXDIVEAVGQUOT

#define DEFAULT_MAXDIVEAVGQUOT   0.0

maximal quotient (curlowerbound - lowerbound)/(avglowerbound - lowerbound) where diving is performed (0.0: no limit)

Definition at line 54 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_MAXDIVEUBQUOTNOSOL

#define DEFAULT_MAXDIVEUBQUOTNOSOL   0.1

maximal UBQUOT when no solution was found yet (0.0: no limit)

Definition at line 57 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_MAXDIVEAVGQUOTNOSOL

#define DEFAULT_MAXDIVEAVGQUOTNOSOL   0.0

maximal AVGQUOT when no solution was found yet (0.0: no limit)

Definition at line 58 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_BACKTRACK

#define DEFAULT_BACKTRACK   TRUE

use one level of backtracking if infeasibility is encountered?

Definition at line 59 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_LPRESOLVEDOMCHGQUOT

#define DEFAULT_LPRESOLVEDOMCHGQUOT   0.15

percentage of immediate domain changes during probing to trigger LP resolve

Definition at line 60 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_LPSOLVEFREQ

#define DEFAULT_LPSOLVEFREQ   0

LP solve frequency for diving heuristics

Definition at line 61 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_ONLYLPBRANCHCANDS

#define DEFAULT_ONLYLPBRANCHCANDS   FALSE

should only LP branching candidates be considered instead of the slower but more general constraint handler diving variable selection?

Definition at line 62 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

DEFAULT_RANDSEED

#define DEFAULT_RANDSEED   83

default random seed

Definition at line 65 of file heur_coefdiving.c.

Referenced by SCIPincludeHeurCoefdiving().

Function Documentation

SCIP_DECL_HEURCOPY()

static SCIP_DECL_HEURCOPY ( heurCopyCoefdiving  )

static

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

Definition at line 83 of file heur_coefdiving.c.

SCIP_DECL_HEURFREE()

static SCIP_DECL_HEURFREE ( heurFreeCoefdiving  )

static

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

Definition at line 97 of file heur_coefdiving.c.

SCIP_DECL_HEURINIT()

static SCIP_DECL_HEURINIT ( heurInitCoefdiving  )

static

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

Definition at line 117 of file heur_coefdiving.c.

SCIP_DECL_HEUREXIT()

static SCIP_DECL_HEUREXIT ( heurExitCoefdiving  )

static

deinitialization method of primal heuristic (called before transformed problem is freed)

Definition at line 137 of file heur_coefdiving.c.

SCIP_DECL_HEUREXEC()

static SCIP_DECL_HEUREXEC ( heurExecCoefdiving  )

static

execution method of primal heuristic

Definition at line 158 of file heur_coefdiving.c.

SCIP_DECL_DIVESETGETSCORE()

static SCIP_DECL_DIVESETGETSCORE ( divesetGetScoreCoefdiving  )

static

returns a score for the given candidate – the best candidate maximizes the diving score

Definition at line 178 of file heur_coefdiving.c.