Scippy

SCIP

Solving Constraint Integer Programs

relax.h File Reference

Detailed Description

internal methods for relaxators

Author
Tobias Achterberg

Definition in file relax.h.

#include "scip/def.h"
#include "blockmemshell/memory.h"
#include "scip/type_primal.h"
#include "scip/type_retcode.h"
#include "scip/type_result.h"
#include "scip/type_set.h"
#include "scip/type_sol.h"
#include "scip/type_stat.h"
#include "scip/type_tree.h"
#include "scip/type_relax.h"
#include "scip/pub_relax.h"

Go to the source code of this file.

Functions

SCIP_RETCODE SCIPrelaxCopyInclude (SCIP_RELAX *relax, SCIP_SET *set)
 
SCIP_RETCODE SCIPrelaxCreate (SCIP_RELAX **relax, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, BMS_BLKMEM *blkmem, const char *name, const char *desc, int priority, int freq, SCIP_DECL_RELAXCOPY((*relaxcopy)), SCIP_DECL_RELAXFREE((*relaxfree)), SCIP_DECL_RELAXINIT((*relaxinit)), SCIP_DECL_RELAXEXIT((*relaxexit)), SCIP_DECL_RELAXINITSOL((*relaxinitsol)), SCIP_DECL_RELAXEXITSOL((*relaxexitsol)), SCIP_DECL_RELAXEXEC((*relaxexec)), SCIP_RELAXDATA *relaxdata)
 
SCIP_RETCODE SCIPrelaxFree (SCIP_RELAX **relax, SCIP_SET *set)
 
SCIP_RETCODE SCIPrelaxInit (SCIP_RELAX *relax, SCIP_SET *set)
 
SCIP_RETCODE SCIPrelaxExit (SCIP_RELAX *relax, SCIP_SET *set)
 
SCIP_RETCODE SCIPrelaxInitsol (SCIP_RELAX *relax, SCIP_SET *set)
 
SCIP_RETCODE SCIPrelaxExitsol (SCIP_RELAX *relax, SCIP_SET *set)
 
SCIP_RETCODE SCIPrelaxExec (SCIP_RELAX *relax, SCIP_SET *set, SCIP_STAT *stat, int depth, SCIP_Real *lowerbound, SCIP_RESULT *result)
 
void SCIPrelaxSetPriority (SCIP_RELAX *relax, SCIP_SET *set, int priority)
 
void SCIPrelaxSetCopy (SCIP_RELAX *relax, SCIP_DECL_RELAXCOPY((*relaxcopy)))
 
void SCIPrelaxSetFree (SCIP_RELAX *relax, SCIP_DECL_RELAXFREE((*relaxfree)))
 
void SCIPrelaxSetInit (SCIP_RELAX *relax, SCIP_DECL_RELAXINIT((*relaxinit)))
 
void SCIPrelaxSetExit (SCIP_RELAX *relax, SCIP_DECL_RELAXEXIT((*relaxexit)))
 
void SCIPrelaxSetInitsol (SCIP_RELAX *relax, SCIP_DECL_RELAXINITSOL((*relaxinitsol)))
 
void SCIPrelaxSetExitsol (SCIP_RELAX *relax, SCIP_DECL_RELAXEXITSOL((*relaxexitsol)))
 
SCIP_Bool SCIPrelaxIsSolved (SCIP_RELAX *relax, SCIP_STAT *stat)
 
void SCIPrelaxEnableOrDisableClocks (SCIP_RELAX *relax, SCIP_Bool enable)
 
SCIP_RETCODE SCIPrelaxationCreate (SCIP_RELAXATION **relaxation, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PRIMAL *primal, SCIP_TREE *tree)
 
SCIP_RETCODE SCIPrelaxationFree (SCIP_RELAXATION **relaxation)
 
void SCIPrelaxationSetSolZero (SCIP_RELAXATION *relaxation, SCIP_Bool iszero)
 
SCIP_Bool SCIPrelaxationIsSolZero (SCIP_RELAXATION *relaxation)
 
void SCIPrelaxationSetSolValid (SCIP_RELAXATION *relaxation, SCIP_Bool isvalid, SCIP_Bool includeslp)
 
SCIP_Bool SCIPrelaxationIsSolValid (SCIP_RELAXATION *relaxation)
 
SCIP_Bool SCIPrelaxationIsLpIncludedForSol (SCIP_RELAXATION *relaxation)
 
void SCIPrelaxationSetSolObj (SCIP_RELAXATION *relaxation, SCIP_Real obj)
 
SCIP_Real SCIPrelaxationGetSolObj (SCIP_RELAXATION *relaxation)
 
void SCIPrelaxationSolObjAdd (SCIP_RELAXATION *relaxation, SCIP_Real val)
 
void SCIPrelaxationUpdateVarObj (SCIP_RELAXATION *relaxation, SCIP_SET *set, SCIP_VAR *var, SCIP_Real oldobj, SCIP_Real newobj)
 

Function Documentation

◆ SCIPrelaxCopyInclude()

SCIP_RETCODE SCIPrelaxCopyInclude ( SCIP_RELAX relax,
SCIP_SET set 
)

copies the given relaxator to a new scip

copies the given relaxation handler to a new scip

Parameters
relaxrelaxation handler
setSCIP_SET of SCIP to copy to

Definition at line 71 of file relax.c.

References SCIP_CALL, SCIP_OKAY, SCIPrelaxGetName(), and SCIPsetDebugMsg.

◆ SCIPrelaxCreate()

SCIP_RETCODE SCIPrelaxCreate ( SCIP_RELAX **  relax,
SCIP_SET set,
SCIP_MESSAGEHDLR messagehdlr,
BMS_BLKMEM blkmem,
const char *  name,
const char *  desc,
int  priority,
int  freq,
SCIP_DECL_RELAXCOPY((*relaxcopy))  ,
SCIP_DECL_RELAXFREE((*relaxfree))  ,
SCIP_DECL_RELAXINIT((*relaxinit))  ,
SCIP_DECL_RELAXEXIT((*relaxexit))  ,
SCIP_DECL_RELAXINITSOL((*relaxinitsol))  ,
SCIP_DECL_RELAXEXITSOL((*relaxexitsol))  ,
SCIP_DECL_RELAXEXEC((*relaxexec))  ,
SCIP_RELAXDATA relaxdata 
)

creates a relaxator

creates a relaxation handler

Parameters
relaxpointer to relaxation handler data structure
setglobal SCIP settings
messagehdlrmessage handler
blkmemblock memory for parameter settings
namename of relaxation handler
descdescription of relaxation handler
prioritypriority of the relaxation handler (negative: after LP, non-negative: before LP)
freqfrequency for calling relaxation handler
relaxdatarelaxation handler data

Definition at line 89 of file relax.c.

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

Referenced by SCIPincludeRelax(), and SCIPincludeRelaxBasic().

◆ SCIPrelaxFree()

SCIP_RETCODE SCIPrelaxFree ( SCIP_RELAX **  relax,
SCIP_SET set 
)

calls destructor and frees memory of relaxator

calls destructor and frees memory of relaxation handler

Parameters
relaxpointer to relaxation handler data structure
setglobal SCIP settings

Definition at line 151 of file relax.c.

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

◆ SCIPrelaxInit()

SCIP_RETCODE SCIPrelaxInit ( SCIP_RELAX relax,
SCIP_SET set 
)

initializes relaxator

initializes relaxation handler

Parameters
relaxrelaxation handler
setglobal SCIP settings

Definition at line 177 of file relax.c.

References SCIP_Relax::initialized, SCIP_Relax::lastsolvednode, SCIP_Relax::name, SCIP_Relax::ncalls, SCIP_Relax::relaxclock, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockReset(), SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, SCIP_Relax::setuptime, and TRUE.

Referenced by SCIPsetSetPriorityNlpi().

◆ SCIPrelaxExit()

SCIP_RETCODE SCIPrelaxExit ( SCIP_RELAX relax,
SCIP_SET set 
)

calls exit method of relaxator

calls exit method of relaxation handler

Parameters
relaxrelaxation handler
setglobal SCIP settings

Definition at line 215 of file relax.c.

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

Referenced by SCIPsetInitPlugins().

◆ SCIPrelaxInitsol()

SCIP_RETCODE SCIPrelaxInitsol ( SCIP_RELAX relax,
SCIP_SET set 
)

informs relaxator that the branch and bound process is being started

informs relaxation handler that the branch and bound process is being started

Parameters
relaxrelaxation handler
setglobal SCIP settings

Definition at line 245 of file relax.c.

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

◆ SCIPrelaxExitsol()

SCIP_RETCODE SCIPrelaxExitsol ( SCIP_RELAX relax,
SCIP_SET set 
)

informs relaxator that the branch and bound process data is being freed

informs relaxation handler that the branch and bound process data is being freed

Parameters
relaxrelaxation handler
setglobal SCIP settings

Definition at line 269 of file relax.c.

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

Referenced by SCIPsetInitsolPlugins().

◆ SCIPrelaxExec()

SCIP_RETCODE SCIPrelaxExec ( SCIP_RELAX relax,
SCIP_SET set,
SCIP_STAT stat,
int  depth,
SCIP_Real lowerbound,
SCIP_RESULT result 
)

calls execution method of relaxator

calls execution method of relaxation handler

Parameters
relaxrelaxation handler
setglobal SCIP settings
statdynamic problem statistics
depthdepth of current node
lowerboundpointer to lower bound computed by the relaxation handler
resultpointer to store the result of the callback method

Definition at line 293 of file relax.c.

References SCIP_Relax::freq, SCIP_Relax::lastsolvednode, SCIP_Relax::name, SCIP_Relax::ncalls, SCIP_Stat::ntotalnodes, SCIP_Relax::relaxclock, SCIP_Stat::relaxcount, SCIP_CALL, SCIP_CONSADDED, SCIP_CUTOFF, SCIP_DIDNOTRUN, SCIP_INVALIDRESULT, SCIP_OKAY, SCIP_REDUCEDDOM, SCIP_SEPARATED, SCIP_SUCCESS, SCIP_SUSPENDED, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, SCIPinProbing(), SCIPrelaxMarkUnsolved(), and SCIPsetDebugMsg.

Referenced by SCIPsolveProbingRelax(), and solveNodeRelax().

◆ SCIPrelaxSetPriority()

void SCIPrelaxSetPriority ( SCIP_RELAX relax,
SCIP_SET set,
int  priority 
)

sets priority of relaxator

sets priority of relaxation handler

Parameters
relaxrelaxation handler
setglobal SCIP settings
prioritynew priority of the relaxation handler

Definition at line 474 of file relax.c.

References FALSE, and SCIP_Relax::priority.

Referenced by SCIPsetRelaxPriority().

◆ SCIPrelaxSetCopy()

void SCIPrelaxSetCopy ( SCIP_RELAX relax,
SCIP_DECL_RELAXCOPY((*relaxcopy))   
)

set copy callback of relaxation handler

set copy method of relaxation handler

Parameters
relaxrelaxation handler

Definition at line 378 of file relax.c.

Referenced by SCIPsetRelaxCopy().

◆ SCIPrelaxSetFree()

void SCIPrelaxSetFree ( SCIP_RELAX relax,
SCIP_DECL_RELAXFREE((*relaxfree))   
)

set destructor callback of relaxation handler

set destructor of relaxation handler

Parameters
relaxrelaxation handler

Definition at line 389 of file relax.c.

Referenced by SCIPsetRelaxFree().

◆ SCIPrelaxSetInit()

void SCIPrelaxSetInit ( SCIP_RELAX relax,
SCIP_DECL_RELAXINIT((*relaxinit))   
)

set initialization callback of relaxation handler

set initialization method of relaxation handler

Parameters
relaxrelaxation handler

Definition at line 400 of file relax.c.

Referenced by SCIPsetRelaxInit().

◆ SCIPrelaxSetExit()

void SCIPrelaxSetExit ( SCIP_RELAX relax,
SCIP_DECL_RELAXEXIT((*relaxexit))   
)

set deinitialization callback of relaxation handler

set deinitialization method of relaxation handler

Parameters
relaxrelaxation handler

Definition at line 411 of file relax.c.

Referenced by SCIPsetRelaxExit().

◆ SCIPrelaxSetInitsol()

void SCIPrelaxSetInitsol ( SCIP_RELAX relax,
SCIP_DECL_RELAXINITSOL((*relaxinitsol))   
)

set solving process initialization callback of relaxation handler

set solving process initialization method of relaxation handler

Parameters
relaxrelaxation handler

Definition at line 422 of file relax.c.

Referenced by SCIPsetRelaxInitsol().

◆ SCIPrelaxSetExitsol()

void SCIPrelaxSetExitsol ( SCIP_RELAX relax,
SCIP_DECL_RELAXEXITSOL((*relaxexitsol))   
)

set solving process deinitialization callback of relaxation handler

set solving process deinitialization method of relaxation handler

Parameters
relaxrelaxation handler

Definition at line 433 of file relax.c.

Referenced by SCIPsetRelaxExitsol().

◆ SCIPrelaxIsSolved()

SCIP_Bool SCIPrelaxIsSolved ( SCIP_RELAX relax,
SCIP_STAT stat 
)

returns whether the relaxation was completely solved at the current node

Parameters
relaxrelaxation handler
statdynamic problem statistics

Definition at line 550 of file relax.c.

References SCIP_Relax::lastsolvednode, and SCIP_Stat::ntotalnodes.

Referenced by updateLoopStatus().

◆ SCIPrelaxEnableOrDisableClocks()

void SCIPrelaxEnableOrDisableClocks ( SCIP_RELAX relax,
SCIP_Bool  enable 
)

enables or disables all clocks of relax, depending on the value of the flag

Parameters
relaxthe relaxation handler for which all clocks should be enabled or disabled
enableshould the clocks of the relaxation handler be enabled?

Definition at line 508 of file relax.c.

References SCIP_Relax::relaxclock, SCIPclockEnableOrDisable(), and SCIP_Relax::setuptime.

◆ SCIPrelaxationCreate()

SCIP_RETCODE SCIPrelaxationCreate ( SCIP_RELAXATION **  relaxation,
BMS_BLKMEM blkmem,
SCIP_SET set,
SCIP_STAT stat,
SCIP_PRIMAL primal,
SCIP_TREE tree 
)

creates global relaxation data

Parameters
relaxationglobal relaxation data
blkmemblock memory
setglobal SCIP settings
statproblem statistics data
primalprimal data
treebranch and bound tree

Definition at line 576 of file relax.c.

References BMSallocMemory, FALSE, SCIP_ALLOC, SCIP_OKAY, and TRUE.

Referenced by prepareReoptimization(), and SCIPtransformProb().

◆ SCIPrelaxationFree()

SCIP_RETCODE SCIPrelaxationFree ( SCIP_RELAXATION **  relaxation)

frees global relaxation data

Parameters
relaxationglobal relaxation data

Definition at line 603 of file relax.c.

References BMSfreeMemory, and SCIP_OKAY.

Referenced by freeReoptSolve(), and freeTransform().

◆ SCIPrelaxationSetSolZero()

void SCIPrelaxationSetSolZero ( SCIP_RELAXATION relaxation,
SCIP_Bool  iszero 
)

sets the relaxsolzero flag in the relaxation data to the given value

Parameters
relaxationglobal relaxation data
iszeroare all values of the relaxation solution set to zero?

Definition at line 615 of file relax.c.

References SCIP_Relaxation::relaxsolzero.

Referenced by SCIPclearRelaxSolVals(), SCIPsetRelaxSolVal(), SCIPsetRelaxSolVals(), and SCIPsetRelaxSolValsSol().

◆ SCIPrelaxationIsSolZero()

SCIP_Bool SCIPrelaxationIsSolZero ( SCIP_RELAXATION relaxation)

returns whether the global relaxation solution is cleared and all values are set to zero

Parameters
relaxationglobal relaxation data

Definition at line 626 of file relax.c.

References SCIP_Relaxation::relaxsolzero.

Referenced by SCIPclearRelaxSolVals().

◆ SCIPrelaxationSetSolValid()

void SCIPrelaxationSetSolValid ( SCIP_RELAXATION relaxation,
SCIP_Bool  isvalid,
SCIP_Bool  includeslp 
)

sets the relaxsolvalid and includeslp flags in the relaxation data to the given values

Parameters
relaxationglobal relaxation data
isvalidis the stored solution valid?
includeslpdoes the relaxator contain all cuts in the LP?

Definition at line 636 of file relax.c.

References SCIP_Relaxation::relaxsolincludeslp, and SCIP_Relaxation::relaxsolvalid.

Referenced by markRelaxsUnsolved(), SCIPmarkRelaxSolInvalid(), SCIPmarkRelaxSolValid(), SCIPsetRelaxSolVal(), SCIPsetRelaxSolVals(), SCIPsetRelaxSolValsSol(), SCIPtreeRestoreRelaxSol(), and solveNode().

◆ SCIPrelaxationIsSolValid()

SCIP_Bool SCIPrelaxationIsSolValid ( SCIP_RELAXATION relaxation)

◆ SCIPrelaxationIsLpIncludedForSol()

SCIP_Bool SCIPrelaxationIsLpIncludedForSol ( SCIP_RELAXATION relaxation)

returns whether the global relaxation solution was computed by a relaxator which included all LP cuts

Parameters
relaxationglobal relaxation data

Definition at line 659 of file relax.c.

References SCIP_Relaxation::relaxsolincludeslp.

Referenced by addCurrentSolution(), enforceConstraints(), SCIPsolveCIP(), SCIPtreeStoreRelaxSol(), and solveNode().

◆ SCIPrelaxationSetSolObj()

void SCIPrelaxationSetSolObj ( SCIP_RELAXATION relaxation,
SCIP_Real  obj 
)

sets the objective value of the global relaxation solution

Parameters
relaxationglobal relaxation data
objobjective value

Definition at line 669 of file relax.c.

References SCIP_Relaxation::relaxsolobjval.

Referenced by SCIPclearRelaxSolVals(), and SCIPsetRelaxSolValsSol().

◆ SCIPrelaxationGetSolObj()

SCIP_Real SCIPrelaxationGetSolObj ( SCIP_RELAXATION relaxation)

returns the objective value of the global relaxation solution w.r.t. the transformed problem

Parameters
relaxationglobal relaxation data

Definition at line 680 of file relax.c.

References SCIP_Relaxation::relaxsolobjval.

Referenced by addCurrentSolution(), enforceConstraints(), SCIPgetRelaxSolObj(), SCIPsolLinkRelaxSol(), SCIPsolveCIP(), and solveNode().

◆ SCIPrelaxationSolObjAdd()

void SCIPrelaxationSolObjAdd ( SCIP_RELAXATION relaxation,
SCIP_Real  val 
)

adds the given value to the global relaxation solution's objective value

Parameters
relaxationglobal relaxation data
valvalue to add to the objective value

Definition at line 690 of file relax.c.

References SCIP_Relaxation::relaxsolobjval.

Referenced by SCIPvarSetRelaxSol().

◆ SCIPrelaxationUpdateVarObj()

void SCIPrelaxationUpdateVarObj ( SCIP_RELAXATION relaxation,
SCIP_SET set,
SCIP_VAR var,
SCIP_Real  oldobj,
SCIP_Real  newobj 
)

updates objective value of current relaxation solution after change of objective coefficient

Parameters
relaxationglobal relaxation data
setglobal SCIP settings
varvariable with changed objective coefficient
oldobjold objective coefficient
newobjnew objective coefficient

Definition at line 701 of file relax.c.

References SCIP_Relaxation::relaxsolobjval, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPvarGetRelaxSol(), and SCIPvarGetStatus().