Scippy

SCIP

Solving Constraint Integer Programs

All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages

Detailed Description

LP diving heuristic that chooses fixings in direction of incumbent solutions.

Author: Tobias Achterberg

Definition in file heur_guideddiving.c.

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

Go to the source code of this file.

Macros
#define	HEUR_NAME "guideddiving"

#define	HEUR_DESC "LP diving heuristic that chooses fixings in direction of incumbent solutions"

#define	HEUR_DISPCHAR 'g'

#define	HEUR_PRIORITY -1007000

#define	HEUR_FREQ 10

#define	HEUR_FREQOFS 7

#define	HEUR_MAXDEPTH -1

#define	HEUR_TIMING SCIP_HEURTIMING_AFTERLPPLUNGE

#define	HEUR_USESSUBSCIP FALSE

#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_BACKTRACK TRUE

#define	MINLPITER 10000

Functions
static	SCIP_DECL_HEURCOPY (heurCopyGuideddiving)

static	SCIP_DECL_HEURFREE (heurFreeGuideddiving)

static	SCIP_DECL_HEURINIT (heurInitGuideddiving)

static	SCIP_DECL_HEUREXIT (heurExitGuideddiving)

static	SCIP_DECL_HEUREXEC (heurExecGuideddiving)

SCIP_RETCODE	SCIPincludeHeurGuideddiving (SCIP *scip)

Macro Definition Documentation

#define HEUR_NAME "guideddiving"

Definition at line 29 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define HEUR_DESC "LP diving heuristic that chooses fixings in direction of incumbent solutions"

Definition at line 30 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define HEUR_DISPCHAR 'g'

Definition at line 31 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define HEUR_PRIORITY -1007000

Definition at line 32 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define HEUR_FREQ 10

Definition at line 33 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define HEUR_FREQOFS 7

Definition at line 34 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define HEUR_MAXDEPTH -1

Definition at line 35 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define HEUR_TIMING SCIP_HEURTIMING_AFTERLPPLUNGE

Definition at line 36 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define HEUR_USESSUBSCIP FALSE

does the heuristic use a secondary SCIP instance?

Definition at line 37 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define DEFAULT_MINRELDEPTH 0.0

minimal relative depth to start diving

Definition at line 44 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define DEFAULT_MAXRELDEPTH 1.0

maximal relative depth to start diving

Definition at line 45 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define DEFAULT_MAXLPITERQUOT 0.05

maximal fraction of diving LP iterations compared to node LP iterations

Definition at line 46 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define DEFAULT_MAXLPITEROFS 1000

additional number of allowed LP iterations

Definition at line 47 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define DEFAULT_MAXDIVEUBQUOT 0.8

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

Definition at line 48 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define DEFAULT_MAXDIVEAVGQUOT 0.0

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

Definition at line 51 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define DEFAULT_BACKTRACK TRUE

use one level of backtracking if infeasibility is encountered?

Definition at line 54 of file heur_guideddiving.c.

Referenced by SCIPincludeHeurGuideddiving().

#define MINLPITER 10000

minimal number of LP iterations allowed in each LP solving call

Definition at line 56 of file heur_guideddiving.c.

Function Documentation

static SCIP_DECL_HEURCOPY ( heurCopyGuideddiving )

static

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

Definition at line 88 of file heur_guideddiving.c.

static SCIP_DECL_HEURFREE ( heurFreeGuideddiving )

static

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

Definition at line 102 of file heur_guideddiving.c.

static SCIP_DECL_HEURINIT ( heurInitGuideddiving )

static

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

Definition at line 122 of file heur_guideddiving.c.

static SCIP_DECL_HEUREXIT ( heurExitGuideddiving )

static

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

Definition at line 146 of file heur_guideddiving.c.

static SCIP_DECL_HEUREXEC ( heurExecGuideddiving )

static

execution method of primal heuristic

Definition at line 166 of file heur_guideddiving.c.

SCIP_RETCODE SCIPincludeHeurGuideddiving ( SCIP * scip )

creates the guideddiving heuristic and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 628 of file heur_guideddiving.c.

References DEFAULT_BACKTRACK, DEFAULT_MAXDIVEAVGQUOT, DEFAULT_MAXDIVEUBQUOT, DEFAULT_MAXLPITEROFS, DEFAULT_MAXLPITERQUOT, DEFAULT_MAXRELDEPTH, DEFAULT_MINRELDEPTH, FALSE, HEUR_DESC, HEUR_DISPCHAR, HEUR_FREQ, HEUR_FREQOFS, HEUR_MAXDEPTH, HEUR_NAME, HEUR_PRIORITY, HEUR_TIMING, HEUR_USESSUBSCIP, NULL, SCIP_CALL, SCIP_OKAY, SCIP_REAL_MAX, SCIPaddBoolParam(), SCIPaddIntParam(), SCIPaddRealParam(), SCIPallocMemory, SCIPincludeHeurBasic(), SCIPsetHeurCopy(), SCIPsetHeurExit(), SCIPsetHeurFree(), SCIPsetHeurInit(), and TRUE.

Referenced by SCIPincludeDefaultPlugins().