sepa_impliedbounds.c File Reference

Detailed Description

implied bounds separator

Author

Kati Wolter

Tobias Achterberg

Definition in file sepa_impliedbounds.c.

#include <assert.h>
#include <string.h>
#include "scip/sepa_impliedbounds.h"
#include "scip/pub_misc.h"

Go to the source code of this file.

Macros
#define	SEPA_NAME   "impliedbounds"
#define	SEPA_DESC   "implied bounds separator"
#define	SEPA_PRIORITY   -50
#define	SEPA_FREQ   0
#define	SEPA_MAXBOUNDDIST   0.0
#define	SEPA_USESSUBSCIP   FALSE
#define	SEPA_DELAY   FALSE
#define	RELCUTCOEFMAXRANGE   1.0
#define	DEFAULT_USETWOSIZECLIQUES   TRUE

Functions
static SCIP_RETCODE	addCut (SCIP *scip, SCIP_SEPA *sepa, SCIP_SOL *sol, SCIP_Real val1, SCIP_VAR *var1, SCIP_Real solval1, SCIP_Real val2, SCIP_VAR *var2, SCIP_Real solval2, SCIP_Real rhs, SCIP_Bool *cutoff, int *ncuts)
static SCIP_RETCODE	separateCuts (SCIP *scip, SCIP_SEPA *sepa, SCIP_SOL *sol, SCIP_Real *solvals, SCIP_VAR **fracvars, SCIP_Real *fracvals, int nfracs, SCIP_Bool *cutoff, int *ncuts)
static	SCIP_DECL_SEPACOPY (sepaCopyImpliedbounds)
static	SCIP_DECL_SEPAFREE (sepaFreeImpliedbounds)
static	SCIP_DECL_SEPAEXECLP (sepaExeclpImpliedbounds)
static	SCIP_DECL_SEPAEXECSOL (sepaExecsolImpliedbounds)
SCIP_RETCODE	SCIPincludeSepaImpliedbounds (SCIP *scip)

Macro Definition Documentation

#define SEPA_NAME   "impliedbounds"

Definition at line 31 of file sepa_impliedbounds.c.

Referenced by SCIP_DECL_SEPACOPY(), SCIP_DECL_SEPAFREE(), and SCIPincludeSepaImpliedbounds().

#define SEPA_DESC   "implied bounds separator"

Definition at line 32 of file sepa_impliedbounds.c.

Referenced by SCIPincludeSepaImpliedbounds().

#define SEPA_PRIORITY   -50

Definition at line 33 of file sepa_impliedbounds.c.

Referenced by SCIPincludeSepaImpliedbounds().

#define SEPA_FREQ   0

Definition at line 34 of file sepa_impliedbounds.c.

Referenced by SCIPincludeSepaImpliedbounds().

#define SEPA_MAXBOUNDDIST   0.0

Definition at line 35 of file sepa_impliedbounds.c.

Referenced by SCIPincludeSepaImpliedbounds().

#define SEPA_USESSUBSCIP   FALSE

does the separator use a secondary SCIP instance?

Definition at line 36 of file sepa_impliedbounds.c.

Referenced by SCIPincludeSepaImpliedbounds().

#define SEPA_DELAY   FALSE

should separation method be delayed, if other separators found cuts?

Definition at line 37 of file sepa_impliedbounds.c.

Referenced by SCIPincludeSepaImpliedbounds().

#define RELCUTCOEFMAXRANGE   1.0

maximal allowed range of cut coefficients, relative to 1/feastol

Definition at line 39 of file sepa_impliedbounds.c.

Referenced by separateCuts().

#define DEFAULT_USETWOSIZECLIQUES   TRUE

should violated inequalities for cliques with 2 variables be separated?

Definition at line 40 of file sepa_impliedbounds.c.

Referenced by SCIPincludeSepaImpliedbounds().

Function Documentation

static SCIP_RETCODE addCut ( SCIP *  scip, SCIP_SEPA *  sepa, SCIP_SOL *  sol, SCIP_Real  val1, SCIP_VAR *  var1, SCIP_Real  solval1, SCIP_Real  val2, SCIP_VAR *  var2, SCIP_Real  solval2, SCIP_Real  rhs, SCIP_Bool *  cutoff, int *  ncuts  )

static

adds given cut with two variables, if it is violated

Parameters

scip	SCIP data structure
sepa	separator
sol	the solution that should be separated, or NULL for LP solution
val1	given coefficient of first variable
var1	given first variable
solval1	current LP solution value of first variable
val2	given coefficient of second variable
var2	given second variable
solval2	current LP solution value of second variable
rhs	given right hand side of the cut to add
cutoff	whether a cutoff has been detected
ncuts	pointer to update number of cuts added

Definition at line 54 of file sepa_impliedbounds.c.

References FALSE, NULL, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPaddCut(), SCIPaddPoolCut(), SCIPaddVarToRow(), SCIPcacheRowExtensions(), SCIPcreateEmptyRowSepa(), SCIPdebugMessage, SCIPflushRowExtensions(), SCIPgetNLPs(), SCIPinfinity(), SCIPisEfficacious(), SCIPprintRow(), SCIPreleaseRow(), SCIProwChgRank(), SCIPsnprintf(), and TRUE.

Referenced by separateCuts().

static SCIP_RETCODE separateCuts ( SCIP *  scip, SCIP_SEPA *  sepa, SCIP_SOL *  sol, SCIP_Real *  solvals, SCIP_VAR **  fracvars, SCIP_Real *  fracvals, int  nfracs, SCIP_Bool *  cutoff, int *  ncuts  )

static

searches and adds implied bound cuts that are violated by the given solution value array

Parameters

scip	SCIP data structure
sepa	separator
sol	the solution that should be separated, or NULL for LP solution
solvals	array with solution values of all problem variables
fracvars	array of fractional variables
fracvals	solution values of fractional variables
nfracs	number of fractional variables
cutoff	whether a cutoff has been detected
ncuts	pointer to store the number of generated cuts

Definition at line 118 of file sepa_impliedbounds.c.

References addCut(), FALSE, NULL, RELCUTCOEFMAXRANGE, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_BINARY, SCIPcleanupCliques(), SCIPcliqueGetNVars(), SCIPcliqueGetValues(), SCIPcliqueGetVars(), SCIPcliqueIsEquation(), SCIPdebugMessage, SCIPfeastol(), SCIPgetCliques(), SCIPgetNCliques(), SCIPgetSolVal(), SCIPisGE(), SCIPisLE(), SCIPsepaGetData(), SCIPvarGetImplBounds(), SCIPvarGetImplTypes(), SCIPvarGetImplVars(), SCIPvarGetLbGlobal(), SCIPvarGetNImpls(), SCIPvarGetProbindex(), SCIPvarGetType(), SCIPvarGetUbGlobal(), and TRUE.

Referenced by SCIP_DECL_SEPAEXECLP(), and SCIP_DECL_SEPAEXECSOL().

static SCIP_DECL_SEPACOPY ( sepaCopyImpliedbounds  )

static

copy method for separator plugins (called when SCIP copies plugins)

Definition at line 357 of file sepa_impliedbounds.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPincludeSepaImpliedbounds(), SCIPsepaGetName(), and SEPA_NAME.

static SCIP_DECL_SEPAFREE ( sepaFreeImpliedbounds  )

static

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

Definition at line 371 of file sepa_impliedbounds.c.

References NULL, SCIP_OKAY, SCIPfreeMemory, SCIPsepaGetData(), SCIPsepaGetName(), SCIPsepaSetData(), and SEPA_NAME.

static SCIP_DECL_SEPAEXECLP ( sepaExeclpImpliedbounds  )

static

LP solution separation method of separator

Definition at line 393 of file sepa_impliedbounds.c.

References NULL, SCIP_Bool, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_Real, SCIP_SEPARATED, SCIPallocBufferArray, SCIPfreeBufferArray, SCIPgetLPBranchCands(), SCIPgetVarsData(), SCIPgetVarSols(), and separateCuts().

static SCIP_DECL_SEPAEXECSOL ( sepaExecsolImpliedbounds  )

static

arbitrary primal solution separation method of separator

Definition at line 445 of file sepa_impliedbounds.c.

References FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_Real, SCIP_SEPARATED, SCIPallocBufferArray, SCIPfreeBufferArray, SCIPgetSolVals(), SCIPgetVarsData(), SCIPisFeasIntegral(), and separateCuts().

SCIP_RETCODE SCIPincludeSepaImpliedbounds

(

SCIP *

scip

)

creates the impliedbounds separator and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 517 of file sepa_impliedbounds.c.

References DEFAULT_USETWOSIZECLIQUES, NULL, SCIP_CALL, SCIP_OKAY, SCIPaddBoolParam(), SCIPallocMemory, SCIPincludeSepaBasic(), SCIPsetSepaCopy(), SCIPsetSepaFree(), SEPA_DELAY, SEPA_DESC, SEPA_FREQ, SEPA_MAXBOUNDDIST, SEPA_NAME, SEPA_PRIORITY, SEPA_USESSUBSCIP, and TRUE.

Referenced by SCIP_DECL_SEPACOPY(), and SCIPincludeDefaultPlugins().