Detailed Description

internal methods for variable pricers

Author: Tobias Achterberg

Definition in file pricer.h.

#include "scip/def.h"
#include "blockmemshell/memory.h"
#include "scip/type_retcode.h"
#include "scip/type_result.h"
#include "scip/type_set.h"
#include "scip/type_lp.h"
#include "scip/type_prob.h"
#include "scip/type_pricestore.h"
#include "scip/type_pricer.h"
#include "scip/pub_pricer.h"

Go to the source code of this file.

Functions
SCIP_RETCODE	SCIPpricerCopyInclude (SCIP_PRICER pricer, SCIP_SET set, SCIP_Bool *valid)

SCIP_RETCODE	SCIPpricerCreate (SCIP_PRICER *pricer, SCIP_SET set, SCIP_MESSAGEHDLR messagehdlr, BMS_BLKMEM blkmem, const char name, const char desc, int priority, SCIP_Bool delay, SCIP_DECL_PRICERCOPY((pricercopy)), SCIP_DECL_PRICERFREE((pricerfree)), SCIP_DECL_PRICERINIT((pricerinit)), SCIP_DECL_PRICEREXIT((pricerexit)), SCIP_DECL_PRICERINITSOL((pricerinitsol)), SCIP_DECL_PRICEREXITSOL((pricerexitsol)), SCIP_DECL_PRICERREDCOST((pricerredcost)), SCIP_DECL_PRICERFARKAS((pricerfarkas)), SCIP_PRICERDATA *pricerdata)

SCIP_RETCODE	SCIPpricerFree (SCIP_PRICER *pricer, SCIP_SET set)

SCIP_RETCODE	SCIPpricerInit (SCIP_PRICER pricer, SCIP_SET set)

SCIP_RETCODE	SCIPpricerExit (SCIP_PRICER pricer, SCIP_SET set)

SCIP_RETCODE	SCIPpricerInitsol (SCIP_PRICER pricer, SCIP_SET set)

SCIP_RETCODE	SCIPpricerExitsol (SCIP_PRICER pricer, SCIP_SET set)

SCIP_RETCODE	SCIPpricerActivate (SCIP_PRICER pricer, SCIP_SET set)

SCIP_RETCODE	SCIPpricerDeactivate (SCIP_PRICER pricer, SCIP_SET set)

SCIP_RETCODE	SCIPpricerRedcost (SCIP_PRICER pricer, SCIP_SET set, SCIP_PROB prob, SCIP_Real lowerbound, SCIP_Bool stopearly, SCIP_RESULT result)

SCIP_RETCODE	SCIPpricerFarkas (SCIP_PRICER pricer, SCIP_SET set, SCIP_PROB *prob)

SCIP_RETCODE	SCIPpricerExec (SCIP_PRICER pricer, SCIP_SET set, SCIP_PROB prob, SCIP_LP lp, SCIP_PRICESTORE pricestore, SCIP_Real lowerbound, SCIP_Bool stopearly, SCIP_RESULT result)

void	SCIPpricerSetPriority (SCIP_PRICER pricer, SCIP_SET set, int priority)

void	SCIPpricerSetCopy (SCIP_PRICER pricer, SCIP_DECL_PRICERCOPY((pricercopy)))

void	SCIPpricerSetFree (SCIP_PRICER pricer, SCIP_DECL_PRICERFREE((pricerfree)))

void	SCIPpricerSetInit (SCIP_PRICER pricer, SCIP_DECL_PRICERINIT((pricerinit)))

void	SCIPpricerSetExit (SCIP_PRICER pricer, SCIP_DECL_PRICEREXIT((pricerexit)))

void	SCIPpricerSetInitsol (SCIP_PRICER pricer, SCIP_DECL_PRICERINITSOL((pricerinitsol)))

void	SCIPpricerSetExitsol (SCIP_PRICER pricer, SCIP_DECL_PRICEREXITSOL((pricerexitsol)))

Function Documentation

SCIP_RETCODE SCIPpricerCopyInclude	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set,
		SCIP_Bool *	valid
	)

copies the given pricer to a new scip

Parameters

pricer	pricer
set	SCIP_SET of SCIP to copy to
valid	was the copying process valid?

Definition at line 77 of file pricer.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIPpricerGetName().

Referenced by SCIPsetCopyPlugins().

SCIP_RETCODE SCIPpricerCreate	(	SCIP_PRICER **	pricer,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		BMS_BLKMEM *	blkmem,
		const char *	name,
		const char *	desc,
		int	priority,
		SCIP_Bool	delay,
		SCIP_DECL_PRICERCOPY((*pricercopy))	,
		SCIP_DECL_PRICERFREE((*pricerfree))	,
		SCIP_DECL_PRICERINIT((*pricerinit))	,
		SCIP_DECL_PRICEREXIT((*pricerexit))	,
		SCIP_DECL_PRICERINITSOL((*pricerinitsol))	,
		SCIP_DECL_PRICEREXITSOL((*pricerexitsol))	,
		SCIP_DECL_PRICERREDCOST((*pricerredcost))	,
		SCIP_DECL_PRICERFARKAS((*pricerfarkas))	,
		SCIP_PRICERDATA *	pricerdata
	)

creates a variable pricer

creates a variable pricer To use the variable pricer for solving a problem, it first has to be activated with a call to SCIPactivatePricer().

Parameters

pricer	pointer to variable pricer data structure
set	global SCIP settings
messagehdlr	message handler
blkmem	block memory for parameter settings
name	name of variable pricer
desc	description of variable pricer
priority	priority of the variable pricer
delay	should the pricer be delayed until no other pricers or already existing problem variables with negative reduced costs are found
pricerdata	variable pricer data

Definition at line 99 of file pricer.c.

References BMSallocMemory, BMSduplicateMemoryArray, FALSE, NULL, paramname, SCIP_ALLOC, SCIP_CALL, SCIP_CLOCKTYPE_DEFAULT, SCIP_MAXSTRLEN, SCIP_OKAY, SCIPclockCreate(), SCIPsetAddIntParam(), and SCIPsnprintf().

Referenced by SCIPincludePricer(), and SCIPincludePricerBasic().

SCIP_RETCODE SCIPpricerFree	(	SCIP_PRICER **	pricer,
		SCIP_SET *	set
	)

calls destructor and frees memory of variable pricer

Parameters

pricer	pointer to variable pricer data structure
set	global SCIP settings

Definition at line 160 of file pricer.c.

References BMSfreeMemory, BMSfreeMemoryArray, NULL, SCIP_CALL, SCIP_OKAY, and SCIPclockFree().

Referenced by SCIPsetFree().

SCIP_RETCODE SCIPpricerInit	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set
	)

initializes variable pricer

Parameters

pricer	variable pricer
set	global SCIP settings

Definition at line 186 of file pricer.c.

References SCIP_Pricer::active, SCIP_Pricer::initialized, SCIP_Pricer::name, SCIP_Pricer::ncalls, NULL, SCIP_Pricer::nvarsfound, SCIP_Pricer::pricerclock, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockReset(), SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, SCIP_Pricer::setuptime, and TRUE.

Referenced by SCIPsetInitPlugins().

SCIP_RETCODE SCIPpricerExit	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set
	)

calls exit method of variable pricer

Parameters

pricer	variable pricer
set	global SCIP settings

Definition at line 226 of file pricer.c.

References SCIP_Pricer::active, FALSE, SCIP_Pricer::initialized, SCIP_Pricer::name, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, and SCIP_Pricer::setuptime.

Referenced by SCIPsetExitPlugins().

SCIP_RETCODE SCIPpricerInitsol	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set
	)

informs variable pricer that the branch and bound process is being started

Parameters

pricer	variable pricer
set	global SCIP settings

Definition at line 257 of file pricer.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Pricer::setuptime.

Referenced by SCIPsetInitsolPlugins().

SCIP_RETCODE SCIPpricerExitsol	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set
	)

informs variable pricer that the branch and bound process data is being freed

Parameters

pricer	variable pricer
set	global SCIP settings

Definition at line 281 of file pricer.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Pricer::setuptime.

Referenced by SCIPsetExitsolPlugins().

SCIP_RETCODE SCIPpricerActivate	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set
	)

activates pricer such that it is called in LP solving loop

Parameters

pricer	variable pricer
set	global SCIP settings

Definition at line 305 of file pricer.c.

References SCIP_Pricer::active, FALSE, NULL, SCIP_OKAY, SCIP_STAGE_PROBLEM, and TRUE.

Referenced by SCIPactivatePricer().

SCIP_RETCODE SCIPpricerDeactivate	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set
	)

deactivates pricer such that it is no longer called in LP solving loop

Parameters

pricer	variable pricer
set	global SCIP settings

Definition at line 325 of file pricer.c.

References SCIP_Pricer::active, FALSE, NULL, SCIP_OKAY, and SCIP_STAGE_PROBLEM.

Referenced by SCIPdeactivatePricer(), and SCIPfreeProb().

SCIP_RETCODE SCIPpricerRedcost	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set,
		SCIP_PROB *	prob,
		SCIP_Real *	lowerbound,
		SCIP_Bool *	stopearly,
		SCIP_RESULT *	result
	)

calls reduced cost pricing method of variable pricer

Parameters

pricer	variable pricer
set	global SCIP settings
prob	transformed problem
lowerbound	local lower bound computed by the pricer
stopearly	should pricing be stopped, although new variables were added?
result	result of the pricing process

Definition at line 345 of file pricer.c.

References SCIP_Pricer::active, SCIP_Pricer::name, SCIP_Pricer::ncalls, NULL, SCIP_Prob::nvars, SCIP_Pricer::nvarsfound, SCIP_Pricer::pricerclock, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIPdebugMessage.

Referenced by SCIPpricerExec().

SCIP_RETCODE SCIPpricerFarkas	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set,
		SCIP_PROB *	prob
	)

calls Farkas pricing method of variable pricer

Parameters

pricer	variable pricer
set	global SCIP settings
prob	transformed problem

Definition at line 385 of file pricer.c.

References SCIP_Pricer::active, SCIP_Pricer::name, SCIP_Pricer::ncalls, NULL, SCIP_Prob::nvars, SCIP_Pricer::nvarsfound, SCIP_Pricer::pricerclock, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIPdebugMessage.

Referenced by SCIPpricerExec().

SCIP_RETCODE SCIPpricerExec	(	SCIP_PRICER *	pricer,
		SCIP_SET *	set,
		SCIP_PROB *	prob,
		SCIP_LP *	lp,
		SCIP_PRICESTORE *	pricestore,
		SCIP_Real *	lowerbound,
		SCIP_Bool *	stopearly,
		SCIP_RESULT *	result
	)

depending on the LP's solution status, calls reduced cost or Farkas pricing method of variable pricer

Parameters

pricer	variable pricer
set	global SCIP settings
prob	transformed problem
lp	LP data
pricestore	pricing storage
lowerbound	local lower bound computed by the pricer
stopearly	should pricing be stopped, although new variables were added?
result	result of the pricing process