history.c File Reference

Detailed Description

methods for branching and inference history

Author

Tobias Achterberg

Definition in file history.c.

#include <assert.h>
#include "scip/def.h"
#include "scip/set.h"
#include "scip/history.h"
#include "scip/pub_misc.h"
#include "scip/pub_history.h"
#include "scip/struct_history.h"

Go to the source code of this file.

Functions
SCIP_RETCODE	SCIPhistoryCreate (SCIP_HISTORY **history, BMS_BLKMEM *blkmem)
void	SCIPhistoryFree (SCIP_HISTORY **history, BMS_BLKMEM *blkmem)
void	SCIPhistoryReset (SCIP_HISTORY *history)
void	SCIPhistoryUnite (SCIP_HISTORY *history, SCIP_HISTORY *addhistory, SCIP_Bool switcheddirs)
void	SCIPhistoryUpdatePseudocost (SCIP_HISTORY *history, SCIP_SET *set, SCIP_Real solvaldelta, SCIP_Real objdelta, SCIP_Real weight)
SCIP_BRANCHDIR	SCIPbranchdirOpposite (SCIP_BRANCHDIR dir)
SCIP_Real	SCIPhistoryGetPseudocost (SCIP_HISTORY *history, SCIP_Real solvaldelta)
SCIP_Real	SCIPhistoryGetPseudocostVariance (SCIP_HISTORY *history, SCIP_BRANCHDIR direction)
SCIP_Real	SCIPhistoryGetPseudocostCount (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
SCIP_Bool	SCIPhistoryIsPseudocostEmpty (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
void	SCIPhistoryIncVSIDS (SCIP_HISTORY *history, SCIP_BRANCHDIR dir, SCIP_Real weight)
void	SCIPhistoryScaleVSIDS (SCIP_HISTORY *history, SCIP_Real scalar)
SCIP_Real	SCIPhistoryGetVSIDS (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
void	SCIPhistoryIncNActiveConflicts (SCIP_HISTORY *history, SCIP_BRANCHDIR dir, SCIP_Real length)
SCIP_Longint	SCIPhistoryGetNActiveConflicts (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
SCIP_Real	SCIPhistoryGetAvgConflictlength (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
void	SCIPhistoryIncNBranchings (SCIP_HISTORY *history, SCIP_BRANCHDIR dir, int depth)
void	SCIPhistoryIncInferenceSum (SCIP_HISTORY *history, SCIP_BRANCHDIR dir, SCIP_Real weight)
void	SCIPhistoryIncCutoffSum (SCIP_HISTORY *history, SCIP_BRANCHDIR dir, SCIP_Real weight)
SCIP_Longint	SCIPhistoryGetNBranchings (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
SCIP_Real	SCIPhistoryGetInferenceSum (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
SCIP_Real	SCIPhistoryGetAvgInferences (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
SCIP_Real	SCIPhistoryGetCutoffSum (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
SCIP_Real	SCIPhistoryGetAvgCutoffs (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
SCIP_Real	SCIPhistoryGetAvgBranchdepth (SCIP_HISTORY *history, SCIP_BRANCHDIR dir)
Value based history
Value based history methods
SCIP_RETCODE	SCIPvaluehistoryCreate (SCIP_VALUEHISTORY **valuehistory, BMS_BLKMEM *blkmem)
void	SCIPvaluehistoryFree (SCIP_VALUEHISTORY **valuehistory, BMS_BLKMEM *blkmem)
SCIP_RETCODE	SCIPvaluehistoryFind (SCIP_VALUEHISTORY *valuehistory, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_Real value, SCIP_HISTORY **history)
void	SCIPvaluehistoryScaleVSIDS (SCIP_VALUEHISTORY *valuehistory, SCIP_Real scalar)
int	SCIPvaluehistoryGetNValues (SCIP_VALUEHISTORY *valuehistory)
SCIP_HISTORY **	SCIPvaluehistoryGetHistories (SCIP_VALUEHISTORY *valuehistory)
SCIP_Real *	SCIPvaluehistoryGetValues (SCIP_VALUEHISTORY *valuehistory)

Function Documentation

SCIP_RETCODE SCIPhistoryCreate	(	SCIP_HISTORY **	history,
		BMS_BLKMEM *	blkmem
	)

creates an empty history entry

Parameters

history	pointer to store branching and inference history
blkmem	block memory

Definition at line 40 of file history.c.

References BMSallocBlockMemory, NULL, SCIP_ALLOC, SCIP_OKAY, and SCIPhistoryReset().

Referenced by SCIPstatCreate(), SCIPvaluehistoryFind(), and varCreate().

void SCIPhistoryFree	(	SCIP_HISTORY **	history,
		BMS_BLKMEM *	blkmem
	)

frees a history entry

Parameters

history	pointer to branching and inference history
blkmem	block memory

Definition at line 55 of file history.c.

References BMSfreeBlockMemory, and NULL.

Referenced by SCIPstatFree(), SCIPvaluehistoryFree(), and varFree().

void SCIPhistoryReset

(

SCIP_HISTORY *

history

)

resets history entry to zero

Parameters

history

branching and inference history

Definition at line 67 of file history.c.

References SCIP_History::branchdepthsum, SCIP_History::conflengthsum, SCIP_History::cutoffsum, SCIP_History::inferencesum, SCIP_History::nactiveconflicts, SCIP_History::nbranchings, NULL, SCIP_History::pscostcount, SCIP_History::pscostvariance, SCIP_History::pscostweightedmean, and SCIP_History::vsids.

Referenced by SCIPhistoryCreate(), SCIPstatReset(), SCIPstatResetCurrentRun(), SCIPvarAggregate(), SCIPvarFix(), and SCIPvarInitSolve().

void SCIPhistoryUnite	(	SCIP_HISTORY *	history,
		SCIP_HISTORY *	addhistory,
		SCIP_Bool	switcheddirs
	)

unites two history entries by adding the values of the second one to the first one

Parameters

history	branching and inference history
addhistory	history values to add to history
switcheddirs	should the history entries be united with switched directories

Definition at line 96 of file history.c.

References SCIP_History::branchdepthsum, SCIP_History::conflengthsum, SCIP_History::cutoffsum, SCIP_History::inferencesum, MAX, SCIP_History::nactiveconflicts, SCIP_History::nbranchings, NULL, SCIP_History::pscostcount, SCIP_History::pscostvariance, SCIP_History::pscostweightedmean, SCIP_Real, and SCIP_History::vsids.

Referenced by SCIPvarAggregate(), SCIPvarMergeHistories(), and SCIPvarTransform().

void SCIPhistoryUpdatePseudocost	(	SCIP_HISTORY *	history,
		SCIP_SET *	set,
		SCIP_Real	solvaldelta,
		SCIP_Real	objdelta,
		SCIP_Real	weight
	)

updates the pseudo costs for a change of "solvaldelta" in the variable's LP solution value and a change of "objdelta" in the LP's objective value

Parameters

history	branching and inference history
set	global SCIP settings
solvaldelta	difference of variable's new LP value - old LP value
objdelta	difference of new LP's objective value - old LP's objective value
weight	weight of this update in pseudo cost sum (added to pscostcount)

Definition at line 159 of file history.c.

References MAX, NULL, SCIP_History::pscostcount, SCIP_History::pscostvariance, SCIP_History::pscostweightedmean, REALABS, SCIP_Real, SCIPdebugMessage, SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPsetPseudocostdelta(), and SCIPsetPseudocosteps().

Referenced by SCIPvarUpdatePseudocost().

SCIP_BRANCHDIR SCIPbranchdirOpposite

(

SCIP_BRANCHDIR

dir

)

returns the opposite direction of the given branching direction

Parameters

dir	branching direction

Definition at line 414 of file history.c.

References SCIP_BRANCHDIR_AUTO, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPvarAggregate(), SCIPvarChgBranchDirection(), SCIPvarGetAvgBranchdepth(), SCIPvarGetAvgConflictlength(), SCIPvarGetAvgConflictlengthCurrentRun(), SCIPvarGetAvgCutoffs(), SCIPvarGetAvgCutoffsCurrentRun(), SCIPvarGetAvgInferences(), SCIPvarGetAvgInferencesCurrentRun(), SCIPvarGetCutoffSum(), SCIPvarGetCutoffSumCurrentRun(), SCIPvarGetInferenceSum(), SCIPvarGetInferenceSumCurrentRun(), SCIPvarGetNActiveConflicts(), SCIPvarGetNActiveConflictsCurrentRun(), SCIPvarGetNBranchings(), SCIPvarGetNBranchingsCurrentRun(), SCIPvarGetPseudocostCount(), SCIPvarGetPseudocostCountCurrentRun(), SCIPvarGetPseudocostVariance(), SCIPvarGetVSIDS_rec(), SCIPvarGetVSIDSCurrentRun(), SCIPvarIncCutoffSum(), SCIPvarIncInferenceSum(), SCIPvarIncNActiveConflicts(), SCIPvarIncNBranchings(), SCIPvarIncVSIDS(), SCIPvarMultiaggregate(), SCIPvarNegate(), and varProcessChgBranchDirection().

SCIP_Real SCIPhistoryGetPseudocost	(	SCIP_HISTORY *	history,
		SCIP_Real	solvaldelta
	)

returns the expected dual gain for moving the corresponding variable by "solvaldelta"

Parameters

history	branching and inference history
solvaldelta	difference of variable's new LP value - old LP value

Definition at line 423 of file history.c.

References NULL, SCIP_History::pscostcount, and SCIP_History::pscostweightedmean.

Referenced by SCIPgetAvgPseudocost(), SCIPgetAvgPseudocostCurrentRun(), SCIPgetAvgPseudocostScore(), SCIPgetAvgPseudocostScoreCurrentRun(), SCIPprintBranchingStatistics(), SCIPvarGetPseudocost(), and SCIPvarGetPseudocostCurrentRun().

SCIP_Real SCIPhistoryGetPseudocostVariance	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	direction
	)

returns the variance of pseudo costs about the mean.

Parameters

history	branching and inference history
direction	direction of variable: 1 for upwards history, 0 for downwards history

Definition at line 437 of file history.c.

References NULL, SCIP_History::pscostcount, SCIP_History::pscostvariance, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, and SCIP_Real.

Referenced by SCIPprintBranchingStatistics(), and SCIPvarGetPseudocostVariance().

SCIP_Real SCIPhistoryGetPseudocostCount	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

returns the (possible fractional) number of (partial) pseudo cost updates performed on this pseudo cost entry in the given branching direction

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)

Definition at line 461 of file history.c.

References NULL, SCIP_History::pscostcount, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPgetAvgPseudocostCount(), SCIPgetAvgPseudocostCountCurrentRun(), SCIPprintBranchingStatistics(), SCIPvarGetPseudocost(), SCIPvarGetPseudocostCount(), SCIPvarGetPseudocostCountCurrentRun(), and SCIPvarGetPseudocostCurrentRun().

SCIP_Bool SCIPhistoryIsPseudocostEmpty	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

returns whether the pseudo cost entry is empty in the given branching direction (whether no value was added yet)

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)

Definition at line 474 of file history.c.

References NULL, SCIP_History::pscostcount, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

void SCIPhistoryIncVSIDS	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir,
		SCIP_Real	weight
	)

increases the conflict score of the history entry by the given weight

Parameters

history	branching and inference history
dir	branching direction
weight	weight of this update in conflict score

Definition at line 487 of file history.c.

References NULL, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, and SCIP_History::vsids.

Referenced by incVSIDS(), and SCIPvarIncVSIDS().

void SCIPhistoryScaleVSIDS	(	SCIP_HISTORY *	history,
		SCIP_Real	scalar
	)

scales the conflict score values with the given scalar

Parameters

history	branching and inference history
scalar	scalar to multiply the conflict scores with

Definition at line 501 of file history.c.

References NULL, and SCIP_History::vsids.

Referenced by SCIPconflictInit(), SCIPvaluehistoryScaleVSIDS(), and SCIPvarScaleVSIDS().

SCIP_Real SCIPhistoryGetVSIDS	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

gets the conflict score of the history entry

Parameters

history	branching and inference history
dir	branching direction

Definition at line 513 of file history.c.

References NULL, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, and SCIP_History::vsids.

Referenced by checkValueScore(), SCIPgetAvgConflictScore(), SCIPgetAvgConflictScoreCurrentRun(), SCIPvarGetVSIDS(), SCIPvarGetVSIDS_rec(), SCIPvarGetVSIDSCurrentRun(), and SCIPvarIncVSIDS().

void SCIPhistoryIncNActiveConflicts	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir,
		SCIP_Real	length
	)

increases the number of active conflicts by one and the overall length of the history entry by the given weight

Parameters

history	branching and inference history
dir	branching direction
length	length of the conflict

Definition at line 526 of file history.c.

References SCIP_History::conflengthsum, SCIP_History::nactiveconflicts, NULL, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPvarIncNActiveConflicts(), and updateStatistics().

SCIP_Longint SCIPhistoryGetNActiveConflicts	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

gets the number of active conflicts of the history entry

Parameters

history	branching and inference history
dir	branching direction

Definition at line 542 of file history.c.

References SCIP_History::nactiveconflicts, NULL, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPvarGetNActiveConflicts(), and SCIPvarGetNActiveConflictsCurrentRun().

SCIP_Real SCIPhistoryGetAvgConflictlength	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

gets the average conflict length of the history entry

Parameters

history	branching and inference history
dir	branching direction

Definition at line 555 of file history.c.

References SCIP_History::conflengthsum, SCIP_History::nactiveconflicts, NULL, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, and SCIP_Real.

Referenced by SCIPgetAvgConflictlengthScore(), SCIPgetAvgConflictlengthScoreCurrentRun(), SCIPvarGetAvgConflictlength(), and SCIPvarGetAvgConflictlengthCurrentRun().

void SCIPhistoryIncNBranchings	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir,
		int	depth
	)

increases the number of branchings counter

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)
depth	depth at which the bound change took place

Definition at line 568 of file history.c.

References SCIP_History::branchdepthsum, SCIP_History::nbranchings, NULL, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPvarIncNBranchings().

void SCIPhistoryIncInferenceSum	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir,
		SCIP_Real	weight
	)

increases the number of inferences counter by a certain value

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)
weight	weight of this update in inference score

Definition at line 584 of file history.c.

References SCIP_History::inferencesum, SCIP_History::nbranchings, NULL, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPvarIncInferenceSum().

void SCIPhistoryIncCutoffSum	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir,
		SCIP_Real	weight
	)

increases the number of cutoffs counter

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)
weight	weight of this update in cutoff score

Definition at line 600 of file history.c.

References SCIP_History::cutoffsum, SCIP_History::nbranchings, NULL, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPvarIncCutoffSum().

SCIP_Longint SCIPhistoryGetNBranchings	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

get number of branchings counter

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)

Definition at line 616 of file history.c.

References SCIP_History::nbranchings, NULL, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPprintBranchingStatistics(), SCIPvarGetAvgCutoffs(), SCIPvarGetAvgCutoffsCurrentRun(), SCIPvarGetAvgInferences(), SCIPvarGetAvgInferencesCurrentRun(), SCIPvarGetNBranchings(), and SCIPvarGetNBranchingsCurrentRun().

SCIP_Real SCIPhistoryGetInferenceSum	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

get number of inferences counter

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)

Definition at line 629 of file history.c.

References SCIP_History::inferencesum, NULL, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by SCIPprintBranchingStatistics(), SCIPvarGetInferenceSum(), and SCIPvarGetInferenceSumCurrentRun().

SCIP_Real SCIPhistoryGetAvgInferences	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

returns the average number of inferences per branching

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)

Definition at line 642 of file history.c.

References SCIP_History::inferencesum, SCIP_History::nbranchings, NULL, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, and SCIP_Real.

Referenced by SCIPgetAvgInferences(), SCIPgetAvgInferenceScore(), SCIPgetAvgInferenceScoreCurrentRun(), SCIPgetAvgInferencesCurrentRun(), SCIPgetVarAvgInferenceCutoffScore(), SCIPgetVarAvgInferenceCutoffScoreCurrentRun(), SCIPvarGetAvgInferences(), and SCIPvarGetAvgInferencesCurrentRun().

SCIP_Real SCIPhistoryGetCutoffSum	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

get number of cutoffs counter

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)

Definition at line 655 of file history.c.

References SCIP_History::cutoffsum, NULL, SCIP_BRANCHDIR_DOWNWARDS, and SCIP_BRANCHDIR_UPWARDS.

Referenced by checkValueScore(), SCIPprintBranchingStatistics(), SCIPvarGetCutoffSum(), and SCIPvarGetCutoffSumCurrentRun().

SCIP_Real SCIPhistoryGetAvgCutoffs	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

returns the average number of cutoffs per branching

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)

Definition at line 668 of file history.c.

References SCIP_History::cutoffsum, SCIP_History::nbranchings, NULL, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, and SCIP_Real.

Referenced by SCIPgetAvgCutoffs(), SCIPgetAvgCutoffScore(), SCIPgetAvgCutoffScoreCurrentRun(), SCIPgetAvgCutoffsCurrentRun(), SCIPvarGetAvgCutoffs(), and SCIPvarGetAvgCutoffsCurrentRun().

SCIP_Real SCIPhistoryGetAvgBranchdepth	(	SCIP_HISTORY *	history,
		SCIP_BRANCHDIR	dir
	)

returns the average depth of bound changes due to branching

Parameters

history	branching and inference history
dir	branching direction (downwards, or upwards)

Definition at line 681 of file history.c.

References SCIP_History::branchdepthsum, SCIP_History::nbranchings, NULL, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, and SCIP_Real.

Referenced by SCIPvarGetAvgBranchdepth(), and SCIPvarGetAvgBranchdepthCurrentRun().