Scippy

SCIP

Solving Constraint Integer Programs

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Detailed Description

weakcompr tree compression

Author: Jakob Witzig

Definition in file compr_weakcompr.c.

#include <assert.h>
#include "scip/mem.h"
#include "scip/misc.h"
#include "scip/compr_weakcompr.h"
#include "scip/compr.h"
#include "scip/pub_reopt.h"

Go to the source code of this file.

Macros
#define	COMPR_NAME "weakcompr"

#define	COMPR_DESC "reduce the search frontier to k+1 or max{2, \|C\|+1} nodes."

#define	COMPR_PRIORITY 1000

#define	COMPR_MINNNODES 50

#define	DEFAULT_MEM_REPR 2 /* since we cannot convert the added constraints into node currently, we choose 2 as default value */

Functions
static SCIP_RETCODE	sortIDs (SCIP scip, unsigned int childids, int nchildids)

static SCIP_RETCODE	checkMemSize (SCIP scip, SCIP_COMPRDATA comprdata, int nrepresentatives)

static SCIP_RETCODE	constructCompression (SCIP scip, SCIP_COMPR compr, SCIP_COMPRDATA comprdata, SCIP_RESULT result)

static SCIP_RETCODE	applyCompression (SCIP scip, SCIP_COMPR compr, SCIP_COMPRDATA comprdata, SCIP_RESULT result)

static	SCIP_DECL_COMPRFREE (comprFreeWeakcompr)

static	SCIP_DECL_COMPREXIT (comprExitWeakcompr)

static	SCIP_DECL_COMPREXEC (comprExecWeakcompr)

SCIP_RETCODE	SCIPincludeComprWeakcompr (SCIP *scip)

Macro Definition Documentation

#define COMPR_NAME "weakcompr"

Definition at line 31 of file compr_weakcompr.c.

Referenced by constructCompression(), SCIP_DECL_COMPREXEC(), and SCIPincludeComprWeakcompr().

#define COMPR_DESC "reduce the search frontier to k+1 or max{2, |C|+1} nodes."

Definition at line 32 of file compr_weakcompr.c.

Referenced by SCIPincludeComprWeakcompr().

#define COMPR_PRIORITY 1000

Definition at line 33 of file compr_weakcompr.c.

Referenced by SCIPincludeComprWeakcompr().

#define COMPR_MINNNODES 50

Definition at line 34 of file compr_weakcompr.c.

Referenced by SCIPincludeComprWeakcompr().

#define DEFAULT_MEM_REPR 2 /* since we cannot convert the added constraints into node currently, we choose 2 as default value */

Definition at line 36 of file compr_weakcompr.c.

Referenced by SCIP_DECL_COMPREXEC().

Function Documentation

static SCIP_RETCODE sortIDs	(	SCIP *	scip,
		unsigned int *	childids,
		int	nchildids
	)

static

sort the ids of child nodes by their dual bound of the last iteration

Parameters

scip	SCIP data structure
childids	array of child ids
nchildids	first position

Definition at line 61 of file compr_weakcompr.c.

References SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPfreeBufferArray, SCIPgetReoptnode(), SCIPreoptnodeGetLowerbound(), and SCIPsortDownRealInt().

Referenced by constructCompression().

static SCIP_RETCODE checkMemSize	(	SCIP *	scip,
		SCIP_COMPRDATA *	comprdata,
		int	nrepresentatives
	)

static

check of enough memory is allocated and reallocate of necessary.

Parameters

scip	SCIP data structure
comprdata	compression data
nrepresentatives	number of representatives

Definition at line 88 of file compr_weakcompr.c.

References NULL, SCIP_CALL, SCIP_OKAY, and SCIPreallocBlockMemoryArray.

Referenced by constructCompression().

static SCIP_RETCODE constructCompression	(	SCIP *	scip,
		SCIP_COMPR *	compr,
		SCIP_COMPRDATA *	comprdata,
		SCIP_RESULT *	result
	)

static

try to find a good representation

Parameters

scip	SCIP data structure
compr	compression method
comprdata	compression data
result	result pointer

Definition at line 113 of file compr_weakcompr.c.

References checkMemSize(), COMPR_NAME, NULL, REOPT_CONSTYPE_STRBRANCHED, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_Real, SCIP_STAGE_PRESOLVED, SCIP_SUCCESS, SCIPaddReoptnodeBndchg(), SCIPaddReoptnodeCons(), SCIPallocBlockMemoryArray, SCIPallocBufferArray, SCIPcomprGetMinNodes(), SCIPdebugMessage, SCIPfreeBlockMemoryArray, SCIPfreeBufferArray, SCIPgetCurrentNode(), SCIPgetNBinVars(), SCIPgetNReoptLeaves(), SCIPgetReoptLeaveIDs(), SCIPgetReoptnode(), SCIPgetReoptnodePath(), SCIPgetStage(), SCIPinitRepresentation(), SCIPisFeasEQ(), SCIPnodeGetDepth(), SCIPnodeGetNumber(), SCIPreallocBufferArray, SCIPreoptnodeGetConss(), SCIPreoptnodeGetLowerbound(), SCIPreoptnodeGetNConss(), SCIPreoptnodeGetNVars(), and sortIDs().

Referenced by SCIP_DECL_COMPREXEC().

static SCIP_RETCODE applyCompression	(	SCIP *	scip,
		SCIP_COMPR *	compr,
		SCIP_COMPRDATA *	comprdata,
		SCIP_RESULT *	result
	)

static

apply the stored representation to the reopttree

Parameters

scip	SCIP data structure
compr	compression method
comprdata	compression data
result	result pointer

Definition at line 360 of file compr_weakcompr.c.

References FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_SUCCESS, SCIPreoptnodeSetParentID(), and SCIPsetReoptCompression().

Referenced by SCIP_DECL_COMPREXEC().

static SCIP_DECL_COMPRFREE ( comprFreeWeakcompr )

static

destructor of tree compression to free user data (called when SCIP is exiting)

Definition at line 398 of file compr_weakcompr.c.

References NULL, SCIP_OKAY, SCIPcomprGetData(), SCIPcomprSetData(), and SCIPfreeMemory.

static SCIP_DECL_COMPREXIT ( comprExitWeakcompr )

static

deinitialization method of tree compression (called before transformed problem is freed)

Definition at line 416 of file compr_weakcompr.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPcomprGetData(), SCIPdeleteReoptnode(), and SCIPfreeMemoryArray.

static SCIP_DECL_COMPREXEC ( comprExecWeakcompr )

static

execution method of tree compression

Definition at line 451 of file compr_weakcompr.c.

References applyCompression(), COMPR_NAME, constructCompression(), DEFAULT_MEM_REPR, NULL, SCIP_CALL, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_SUCCESS, SCIPallocClearMemoryArray, SCIPcomprGetData(), SCIPcomprIsInitialized(), SCIPdebugMessage, and TRUE.

SCIP_RETCODE SCIPincludeComprWeakcompr ( SCIP * scip )

creates the weakcompr tree compression and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 493 of file compr_weakcompr.c.

References COMPR_DESC, COMPR_MINNNODES, COMPR_NAME, COMPR_PRIORITY, FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPaddBoolParam(), SCIPallocMemory, SCIPincludeComprBasic(), SCIPsetComprExit(), and SCIPsetComprFree().

Referenced by SCIPincludeDefaultPlugins().