Detailed Description
Constraint handler for logic or constraints \(1^T x \ge 1\) (equivalent to set covering, but algorithms are suited for depth first search).
Definition in file cons_logicor.c.
#include "blockmemshell/memory.h"
#include "scip/cons_linear.h"
#include "scip/cons_logicor.h"
#include "scip/cons_setppc.h"
#include "scip/presolve.h"
#include "scip/pub_conflict.h"
#include "scip/pub_cons.h"
#include "scip/pub_event.h"
#include "scip/pub_lp.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_misc_sort.h"
#include "scip/pub_var.h"
#include "scip/scip_conflict.h"
#include "scip/scip_cons.h"
#include "scip/scip_cut.h"
#include "scip/scip_event.h"
#include "scip/scip_general.h"
#include "scip/scip_lp.h"
#include "scip/scip_mem.h"
#include "scip/scip_message.h"
#include "scip/scip_numerics.h"
#include "scip/scip_param.h"
#include "scip/scip_prob.h"
#include "scip/scip_probing.h"
#include "scip/scip_sol.h"
#include "scip/scip_solvingstats.h"
#include "scip/scip_tree.h"
#include "scip/scip_var.h"
#include <string.h>
Go to the source code of this file.
Functions | |
static SCIP_RETCODE | lockRounding (SCIP *scip, SCIP_CONS *cons, SCIP_VAR *var) |
static SCIP_RETCODE | unlockRounding (SCIP *scip, SCIP_CONS *cons, SCIP_VAR *var) |
static SCIP_RETCODE | conshdlrdataCreate (SCIP *scip, SCIP_CONSHDLRDATA **conshdlrdata, SCIP_EVENTHDLR *eventhdlr) |
static void | conshdlrdataFree (SCIP *scip, SCIP_CONSHDLRDATA **conshdlrdata) |
static SCIP_RETCODE | consdataEnsureVarsSize (SCIP *scip, SCIP_CONSDATA *consdata, int num) |
static SCIP_RETCODE | consdataCreate (SCIP *scip, SCIP_CONSDATA **consdata, int nvars, SCIP_VAR **vars) |
static SCIP_RETCODE | consdataFree (SCIP *scip, SCIP_CONSDATA **consdata) |
static SCIP_RETCODE | consdataPrint (SCIP *scip, SCIP_CONSDATA *consdata, FILE *file, SCIP_Bool endline) |
static SCIP_RETCODE | switchWatchedvars (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, int watchedvar1, int watchedvar2) |
static SCIP_RETCODE | addCoef (SCIP *scip, SCIP_CONS *cons, SCIP_VAR *var) |
static SCIP_RETCODE | delCoefPos (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, int pos) |
static SCIP_RETCODE | dualPresolving (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, int *nfixedvars, int *ndelconss, int *nchgcoefs, SCIP_RESULT *result) |
static SCIP_RETCODE | applyFixings (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, SCIP_Bool *redundant, int *nchgcoefs, int *naddconss, int *ndelconss) |
static SCIP_RETCODE | analyzeConflict (SCIP *scip, SCIP_CONS *cons) |
static SCIP_RETCODE | disableCons (SCIP *scip, SCIP_CONS *cons) |
static SCIP_RETCODE | mergeMultiples (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, unsigned char **entries, int *nentries, SCIP_Bool *redundant, int *nchgcoefs) |
static SCIP_RETCODE | processWatchedVars (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, SCIP_Bool *cutoff, SCIP_Bool *reduceddom, SCIP_Bool *addcut, SCIP_Bool *mustcheck) |
static SCIP_Bool | isConsViolated (SCIP *scip, SCIP_CONS *cons, SCIP_SOL *sol) |
static SCIP_RETCODE | createRow (SCIP *scip, SCIP_CONS *cons) |
static SCIP_RETCODE | addCut (SCIP *scip, SCIP_CONS *cons, SCIP_Bool *cutoff) |
static SCIP_RETCODE | separateCons (SCIP *scip, SCIP_CONS *cons, SCIP_SOL *sol, SCIP_EVENTHDLR *eventhdlr, SCIP_Bool *cutoff, SCIP_Bool *separated, SCIP_Bool *reduceddom) |
static SCIP_RETCODE | enforcePseudo (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, SCIP_Bool *cutoff, SCIP_Bool *infeasible, SCIP_Bool *reduceddom, SCIP_Bool *solvelp) |
static void | consdataSort (SCIP_CONSDATA *consdata) |
static | SCIP_DECL_HASHGETKEY (hashGetKeyLogicorcons) |
static | SCIP_DECL_HASHKEYEQ (hashKeyEqLogicorcons) |
static | SCIP_DECL_HASHKEYVAL (hashKeyValLogicorcons) |
static SCIP_RETCODE | detectRedundantConstraints (SCIP *scip, BMS_BLKMEM *blkmem, SCIP_CONS **conss, int nconss, int *firstchange, int *ndelconss) |
static SCIP_RETCODE | removeRedundantCons (SCIP *scip, SCIP_CONS *cons0, SCIP_CONS *cons1, int *ndelconss) |
static unsigned int | calcSignature (SCIP_VAR **vars, int nvars) |
static void | consdataCalcSignature (SCIP_CONSDATA *consdata) |
static void | removeConsFromOccurList (SCIP_CONS *cons, SCIP_HASHMAP *varstopos, SCIP_CONS ***occurlist, int *noccurlistentries, int occurlistlength) |
static void | findShortestOccurlist (SCIP_VAR **vars, int nvars, SCIP_HASHMAP *varstopos, SCIP_CONS ***occurlist, int *noccurlistentries, int occurlistlength, int *nentries, SCIP_CONS ***shortestlist) |
static SCIP_RETCODE | removeRedundantConss (SCIP *scip, SCIP_CONS *cons, SCIP_HASHMAP *varstopos, SCIP_CONS ***occurlist, int *noccurlistentries, int occurlistlength, int *ndelconss) |
static | SCIP_DECL_SORTPTRCOMP (conssLogicorComp) |
static SCIP_RETCODE | addConsToOccurList (SCIP *scip, SCIP_CONS *cons, SCIP_HASHMAP *varstopos, SCIP_CONS ***occurlist, int *noccurlistentries, int *occurlistsizes, int *occurlistlength, int occurlistsize) |
static SCIP_RETCODE | removeRedundantNonZeros (SCIP *scip, SCIP_CONS *cons, SCIP_VAR *artvar, int artpos, SCIP_HASHMAP *varstopos, SCIP_CONS ***occurlist, int *noccurlistentries, int occurlistlength, SCIP_EVENTHDLR *eventhdlr, int *nchgcoefs, SCIP_Bool *deleted) |
static SCIP_RETCODE | strengthenConss (SCIP *scip, SCIP_CONS **conss, int nconss, SCIP_HASHMAP *varstopos, SCIP_CONS ***occurlist, int *noccurlistentries, int occurlistlength, SCIP_EVENTHDLR *eventhdlr, int *ndelconss, int *nchgcoefs) |
static SCIP_RETCODE | prepareCons (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, unsigned char **entries, int *nentries, SCIP_Bool *redundant, int *nfixedvars, int *nchgcoefs, int *ndelconss, SCIP_Bool *cutoff) |
static SCIP_RETCODE | removeRedundantConssAndNonzeros (SCIP *scip, SCIP_CONS **conss, int nconss, unsigned char **entries, int *nentries, SCIP_EVENTHDLR *eventhdlr, SCIP_Bool usestrengthening, int *firstchange, int *nfixedvars, int *ndelconss, int *nchgcoefs, SCIP_Bool *cutoff) |
static SCIP_RETCODE | shortenConss (SCIP *scip, SCIP_CONSHDLRDATA *conshdlrdata, SCIP_EVENTHDLR *eventhdlr, SCIP_CONS **conss, int nconss, unsigned char **entries, int *nentries, int *nfixedvars, int *ndelconss, int *nchgcoefs, SCIP_Bool *cutoff) |
static SCIP_RETCODE | removeConstraintsDueToNegCliques (SCIP *scip, SCIP_CONSHDLR *conshdlr, SCIP_CONSHDLR *conshdlrsetppc, SCIP_EVENTHDLR *eventhdlr, SCIP_CONS **conss, int nconss, unsigned char **entries, int *nentries, int *nfixedvars, int *ndelconss, int *nupgdconss, int *nchgcoefs, SCIP_Bool *cutoff) |
static SCIP_RETCODE | fixDeleteOrUpgradeCons (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, SCIP_CONSHDLR *conshdlrlinear, SCIP_CONSHDLR *conshdlrsetppc, int *nfixedvars, int *nchgbds, int *nchgcoefs, int *ndelconss, int *naddconss, int *nupgdconss, SCIP_Bool *cutoff) |
static SCIP_RETCODE | createNormalizedLogicor (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_Real *vals, int mult, SCIP_Bool initial, SCIP_Bool separate, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool propagate, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic, SCIP_Bool removable, SCIP_Bool stickingatnode) |
static | SCIP_DECL_LINCONSUPGD (linconsUpgdLogicor) |
static SCIP_RETCODE | enforceConstraint (SCIP *scip, SCIP_CONSHDLR *conshdlr, SCIP_CONS **conss, int nconss, int nusefulconss, SCIP_SOL *sol, SCIP_RESULT *result) |
static | SCIP_DECL_CONSHDLRCOPY (conshdlrCopyLogicor) |
static | SCIP_DECL_CONSFREE (consFreeLogicor) |
static | SCIP_DECL_CONSINITPRE (consInitpreLogicor) |
static | SCIP_DECL_CONSEXITPRE (consExitpreLogicor) |
static | SCIP_DECL_CONSEXITSOL (consExitsolLogicor) |
static | SCIP_DECL_CONSDELETE (consDeleteLogicor) |
static | SCIP_DECL_CONSTRANS (consTransLogicor) |
static | SCIP_DECL_CONSINITLP (consInitlpLogicor) |
static | SCIP_DECL_CONSSEPALP (consSepalpLogicor) |
static | SCIP_DECL_CONSSEPASOL (consSepasolLogicor) |
static | SCIP_DECL_CONSENFOLP (consEnfolpLogicor) |
static | SCIP_DECL_CONSENFORELAX (consEnforelaxLogicor) |
static | SCIP_DECL_CONSENFOPS (consEnfopsLogicor) |
static | SCIP_DECL_CONSCHECK (consCheckLogicor) |
static | SCIP_DECL_CONSPROP (consPropLogicor) |
static | SCIP_DECL_CONSPRESOL (consPresolLogicor) |
static | SCIP_DECL_CONSRESPROP (consRespropLogicor) |
static | SCIP_DECL_CONSLOCK (consLockLogicor) |
static | SCIP_DECL_CONSACTIVE (consActiveLogicor) |
static | SCIP_DECL_CONSDEACTIVE (consDeactiveLogicor) |
static | SCIP_DECL_CONSPRINT (consPrintLogicor) |
static | SCIP_DECL_CONSCOPY (consCopyLogicor) |
static | SCIP_DECL_CONSPARSE (consParseLogicor) |
static | SCIP_DECL_CONSGETVARS (consGetVarsLogicor) |
static | SCIP_DECL_CONSGETNVARS (consGetNVarsLogicor) |
static | SCIP_DECL_EVENTEXEC (eventExecLogicor) |
static | SCIP_DECL_CONFLICTEXEC (conflictExecLogicor) |
SCIP_RETCODE | SCIPincludeConshdlrLogicor (SCIP *scip) |
SCIP_RETCODE | SCIPcreateConsLogicor (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_Bool initial, SCIP_Bool separate, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool propagate, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic, SCIP_Bool removable, SCIP_Bool stickingatnode) |
SCIP_RETCODE | SCIPcreateConsBasicLogicor (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars) |
SCIP_RETCODE | SCIPaddCoefLogicor (SCIP *scip, SCIP_CONS *cons, SCIP_VAR *var) |
int | SCIPgetNVarsLogicor (SCIP *scip, SCIP_CONS *cons) |
SCIP_VAR ** | SCIPgetVarsLogicor (SCIP *scip, SCIP_CONS *cons) |
SCIP_Real | SCIPgetDualsolLogicor (SCIP *scip, SCIP_CONS *cons) |
SCIP_Real | SCIPgetDualfarkasLogicor (SCIP *scip, SCIP_CONS *cons) |
SCIP_ROW * | SCIPgetRowLogicor (SCIP *scip, SCIP_CONS *cons) |
SCIP_RETCODE | SCIPcleanupConssLogicor (SCIP *scip, SCIP_Bool onlychecked, int *naddconss, int *ndelconss, int *nchgcoefs) |
Macro Definition Documentation
◆ CONSHDLR_NAME
#define CONSHDLR_NAME "logicor" |
Definition at line 58 of file cons_logicor.c.
Referenced by addCoef(), enforceConstraint(), enforcePseudo(), processWatchedVars(), SCIPaddCoefLogicor(), SCIPcleanupConssLogicor(), SCIPcreateConsLogicor(), SCIPgetDualfarkasLogicor(), SCIPgetDualsolLogicor(), SCIPgetNVarsLogicor(), SCIPgetRowLogicor(), SCIPgetVarsLogicor(), SCIPincludeConshdlrLogicor(), and separateCons().
◆ CONSHDLR_DESC
#define CONSHDLR_DESC "logic or constraints" |
Definition at line 59 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_SEPAPRIORITY
#define CONSHDLR_SEPAPRIORITY +10000 |
priority of the constraint handler for separation
Definition at line 60 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_ENFOPRIORITY
#define CONSHDLR_ENFOPRIORITY -2000000 |
priority of the constraint handler for constraint enforcing
Definition at line 61 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_CHECKPRIORITY
#define CONSHDLR_CHECKPRIORITY -2000000 |
priority of the constraint handler for checking feasibility
Definition at line 62 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_SEPAFREQ
#define CONSHDLR_SEPAFREQ 0 |
frequency for separating cuts; zero means to separate only in the root node
Definition at line 63 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_PROPFREQ
#define CONSHDLR_PROPFREQ 1 |
frequency for propagating domains; zero means only preprocessing propagation
Definition at line 64 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_EAGERFREQ
#define CONSHDLR_EAGERFREQ 100 |
frequency for using all instead of only the useful constraints in separation, propagation and enforcement, -1 for no eager evaluations, 0 for first only
Definition at line 65 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_MAXPREROUNDS
#define CONSHDLR_MAXPREROUNDS -1 |
maximal number of presolving rounds the constraint handler participates in (-1: no limit)
Definition at line 68 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_DELAYSEPA
#define CONSHDLR_DELAYSEPA FALSE |
should separation method be delayed, if other separators found cuts?
Definition at line 69 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_DELAYPROP
#define CONSHDLR_DELAYPROP FALSE |
should propagation method be delayed, if other propagators found reductions?
Definition at line 70 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_NEEDSCONS
#define CONSHDLR_NEEDSCONS TRUE |
should the constraint handler be skipped, if no constraints are available?
Definition at line 71 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_PRESOLTIMING
#define CONSHDLR_PRESOLTIMING SCIP_PRESOLTIMING_ALWAYS |
Definition at line 73 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONSHDLR_PROP_TIMING
#define CONSHDLR_PROP_TIMING SCIP_PROPTIMING_BEFORELP |
Definition at line 74 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ LINCONSUPGD_PRIORITY
#define LINCONSUPGD_PRIORITY +800000 |
priority of the constraint handler for upgrading of linear constraints
Definition at line 76 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ EVENTHDLR_NAME
#define EVENTHDLR_NAME "logicor" |
Definition at line 78 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ EVENTHDLR_DESC
#define EVENTHDLR_DESC "event handler for logic or constraints" |
Definition at line 79 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONFLICTHDLR_NAME
#define CONFLICTHDLR_NAME "logicor" |
Definition at line 81 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONFLICTHDLR_DESC
#define CONFLICTHDLR_DESC "conflict handler creating logic or constraints" |
Definition at line 82 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ CONFLICTHDLR_PRIORITY
#define CONFLICTHDLR_PRIORITY LINCONSUPGD_PRIORITY |
Definition at line 83 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ DEFAULT_PRESOLPAIRWISE
#define DEFAULT_PRESOLPAIRWISE TRUE |
should pairwise constraint comparison be performed in presolving?
Definition at line 85 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ DEFAULT_STRENGTHEN
#define DEFAULT_STRENGTHEN TRUE |
should pairwise constraint comparison try to strengthen constraints by removing superflous non-zeros?
Definition at line 86 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ HASHSIZE_LOGICORCONS
#define HASHSIZE_LOGICORCONS 500 |
minimal size of hash table in logicor constraint tables
Definition at line 88 of file cons_logicor.c.
Referenced by detectRedundantConstraints().
◆ DEFAULT_PRESOLUSEHASHING
#define DEFAULT_PRESOLUSEHASHING TRUE |
should hash table be used for detecting redundant constraints in advance
Definition at line 89 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ DEFAULT_DUALPRESOLVING
#define DEFAULT_DUALPRESOLVING TRUE |
should dual presolving steps be performed?
Definition at line 90 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ DEFAULT_NEGATEDCLIQUE
#define DEFAULT_NEGATEDCLIQUE TRUE |
should negated clique information be used in presolving
Definition at line 91 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ DEFAULT_IMPLICATIONS
#define DEFAULT_IMPLICATIONS TRUE |
should we try to shrink the variables and derive global boundchanges by using cliques and implications
Definition at line 92 of file cons_logicor.c.
Referenced by SCIPincludeConshdlrLogicor().
◆ AGEINCREASE
#define AGEINCREASE | ( | n | ) | (1.0 + 0.2 * (n)) |
Definition at line 98 of file cons_logicor.c.
Referenced by processWatchedVars().
◆ MAX_CONSLENGTH
#define MAX_CONSLENGTH 200 |
Definition at line 3115 of file cons_logicor.c.
Referenced by shortenConss().
◆ MAXCOMPARISONS
#define MAXCOMPARISONS 1000000 |
Definition at line 3311 of file cons_logicor.c.
Referenced by removeConstraintsDueToNegCliques().
Function Documentation
◆ lockRounding()
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static |
installs rounding locks for the given variable in the given logic or constraint
- Parameters
-
scip SCIP data structure cons logic or constraint var variable of constraint entry
Definition at line 166 of file cons_logicor.c.
References FALSE, SCIP_CALL, SCIP_OKAY, SCIPlockVarCons(), TRUE, and unlockRounding().
Referenced by addCoef().
◆ unlockRounding()
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static |
removes rounding locks for the given variable in the given logic or constraint
- Parameters
-
scip SCIP data structure cons logic or constraint var variable of constraint entry
Definition at line 179 of file cons_logicor.c.
References conshdlrdataCreate(), FALSE, SCIP_CALL, SCIP_OKAY, SCIPunlockVarCons(), and TRUE.
Referenced by delCoefPos(), and lockRounding().
◆ conshdlrdataCreate()
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static |
creates constraint handler data for logic or constraint handler
- Parameters
-
scip SCIP data structure conshdlrdata pointer to store the constraint handler data eventhdlr event handler
Definition at line 192 of file cons_logicor.c.
References conshdlrdataFree(), NULL, SCIP_CALL, SCIP_OKAY, and SCIPallocBlockMemory.
Referenced by SCIPincludeConshdlrLogicor(), and unlockRounding().
◆ conshdlrdataFree()
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static |
frees constraint handler data for logic or constraint handler
- Parameters
-
scip SCIP data structure conshdlrdata pointer to the constraint handler data
Definition at line 217 of file cons_logicor.c.
References consdataEnsureVarsSize(), NULL, and SCIPfreeBlockMemory.
Referenced by conshdlrdataCreate().
◆ consdataEnsureVarsSize()
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static |
ensures, that the vars array can store at least num entries
- Parameters
-
scip SCIP data structure consdata logicor constraint data num minimum number of entries to store
Definition at line 230 of file cons_logicor.c.
References consdataCreate(), NULL, SCIP_CALL, SCIP_OKAY, SCIPcalcMemGrowSize(), and SCIPreallocBlockMemoryArray.
Referenced by addCoef(), and conshdlrdataFree().
◆ consdataCreate()
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static |
creates a logic or constraint data object
- Parameters
-
scip SCIP data structure consdata pointer to store the logic or constraint data nvars number of variables in the constraint vars variables of the constraint
Definition at line 254 of file cons_logicor.c.
References consdataFree(), FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_MULTAGGR, SCIPallocBlockMemory, SCIPcaptureVar(), SCIPduplicateBlockMemoryArray, SCIPgetTransformedVars(), SCIPisTransformed(), SCIPvarGetProbvar(), SCIPvarGetStatus(), and TRUE.
Referenced by consdataEnsureVarsSize(), and SCIPcreateConsLogicor().
◆ consdataFree()
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static |
frees a logic or constraint data
- Parameters
-
scip SCIP data structure consdata pointer to the logic or constraint
Definition at line 322 of file cons_logicor.c.
References consdataPrint(), NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPfreeBlockMemoryArrayNull, SCIPreleaseRow(), and SCIPreleaseVar().
Referenced by consdataCreate().
◆ consdataPrint()
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static |
prints logic or constraint to file stream
- Parameters
-
scip SCIP data structure consdata logic or constraint data file output file (or NULL for standard output) endline should an endline be set?
Definition at line 353 of file cons_logicor.c.
References NULL, SCIP_CALL, SCIP_OKAY, SCIPinfoMessage(), SCIPwriteVarsList(), switchWatchedvars(), and TRUE.
Referenced by applyFixings(), and consdataFree().
◆ switchWatchedvars()
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static |
stores the given variable numbers as watched variables, and updates the event processing
- Parameters
-
scip SCIP data structure cons logic or constraint eventhdlr event handler to call for the event processing watchedvar1 new first watched variable watchedvar2 new second watched variable
Definition at line 379 of file cons_logicor.c.
References addCoef(), NULL, SCIP_CALL, SCIP_EVENTTYPE_LBRELAXED, SCIP_EVENTTYPE_UBTIGHTENED, SCIP_OKAY, SCIPcatchVarEvent(), SCIPconsGetData(), and SCIPdropVarEvent().
Referenced by consdataPrint(), delCoefPos(), and processWatchedVars().
◆ addCoef()
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static |
adds coefficient in logicor constraint
- Parameters
-
scip SCIP data structure cons logicor constraint var variable to add to the constraint
Definition at line 450 of file cons_logicor.c.
References consdataEnsureVarsSize(), CONSHDLR_NAME, delCoefPos(), FALSE, lockRounding(), NULL, SCIP_Bool, SCIP_CALL, SCIP_EVENTTYPE_VARFIXED, SCIP_OKAY, SCIP_STAGE_INITPRESOLVE, SCIP_STAGE_PRESOLVING, SCIP_VARSTATUS_MULTAGGR, SCIPaddVarToRow(), SCIPcaptureVar(), SCIPcatchVarEvent(), SCIPconsGetData(), SCIPconshdlrGetData(), SCIPconsIsTransformed(), SCIPfindConshdlr(), SCIPgetStage(), SCIPgetTransformedVar(), SCIPvarGetProbvar(), SCIPvarGetStatus(), SCIPvarIsTransformed(), and TRUE.
Referenced by applyFixings(), SCIPaddCoefLogicor(), and switchWatchedvars().
◆ delCoefPos()
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static |
deletes coefficient at given position from logic or constraint data
- Parameters
-
scip SCIP data structure cons logic or constraint eventhdlr event handler to call for the event processing pos position of coefficient to delete
Definition at line 520 of file cons_logicor.c.
References dualPresolving(), FALSE, NULL, SCIP_CALL, SCIP_EVENTTYPE_VARFIXED, SCIP_OKAY, SCIP_STAGE_INITPRESOLVE, SCIP_STAGE_PRESOLVING, SCIPconsGetData(), SCIPconsIsTransformed(), SCIPdropVarEvent(), SCIPenableConsPropagation(), SCIPgetStage(), SCIPreleaseVar(), SCIPvarIsTransformed(), switchWatchedvars(), TRUE, and unlockRounding().
Referenced by addCoef(), applyFixings(), dualPresolving(), mergeMultiples(), removeConstraintsDueToNegCliques(), removeRedundantNonZeros(), and shortenConss().
◆ dualPresolving()
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static |
in case a part (more than one variable) in the logic or constraint is independent of every else, we can perform dual reductions;
- fix the variable with the smallest object coefficient to one if the constraint is not modifiable and all variable are independant
- fix all independant variables with negative object coefficient to one
- fix all remaining independant variables to zero
also added the special case were exactly one variable is locked by this constraint and another variable without any uplocks has a better objective value than this single variable
- here we fix the variable to 0.0 (if the objective contribution is non-negative)
Note: the following dual reduction for logic or constraints is already performed by the presolver "dualfix"
- if a variable in a set covering constraint is only locked by that constraint and has negative or zero objective coefficient than it can be fixed to one
- Parameters
-
scip SCIP data structure cons setppc constraint eventhdlr event handler to call for the event processing nfixedvars pointer to count number of fixings ndelconss pointer to count number of deleted constraints nchgcoefs pointer to count number of changed/deleted coefficients result pointer to store the result SCIP_SUCCESS, if presolving was performed
Definition at line 602 of file cons_logicor.c.
References applyFixings(), delCoefPos(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_LOCKTYPE_MODEL, SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPdelCons(), SCIPfixVar(), SCIPinfinity(), SCIPisGE(), SCIPisLT(), SCIPisNegative(), SCIPvarGetAggregatedObj(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetNLocksDownType(), SCIPvarGetNLocksUpType(), SCIPvarGetObj(), SCIPvarGetProbvarBinary(), SCIPvarGetUbGlobal(), and SCIPvarIsActive().
Referenced by delCoefPos().
◆ applyFixings()
|
static |
deletes all zero-fixed variables, checks for variables fixed to one, replace all variables which are not active or not a negation of an active variable by there active or negation of an active counterpart
- Parameters
-
scip SCIP data structure cons logic or constraint eventhdlr event handler to call for the event processing redundant returns whether a variable fixed to one exists in the constraint nchgcoefs pointer to count number of changed/deleted coefficients naddconss pointer to count number of added constraints, or NULL indicating we can not resolve multi-aggregations ndelconss pointer to count number of deleted constraints, or NULL indicating we can not resolve multi-aggregations
Definition at line 857 of file cons_logicor.c.
References addCoef(), analyzeConflict(), consdataPrint(), delCoefPos(), FALSE, MAX, NULL, SCIP_Bool, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIP_VARSTATUS_NEGATED, SCIPaddCons(), SCIPallocBufferArray, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsAdded(), SCIPconsIsChecked(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsLinear(), SCIPdebug, SCIPdebugMsg, SCIPdebugPrintCons, SCIPdelCons(), SCIPfreeBufferArray, SCIPgetBinvarRepresentatives(), SCIPgetProbvarLinearSum(), SCIPinfinity(), SCIPisEQ(), SCIPisFeasEQ(), SCIPisZero(), SCIPreallocBufferArray, SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetNegatedVar(), SCIPvarGetNegationVar(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarIsActive(), SCIPvarIsBinary(), SCIPwarningMessage(), and TRUE.
Referenced by dualPresolving(), fixDeleteOrUpgradeCons(), prepareCons(), and SCIPcleanupConssLogicor().
◆ analyzeConflict()
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static |
analyzes conflicting assignment on given constraint, and adds conflict constraint to problem
- Parameters
-
scip SCIP data structure cons logic or constraint that detected the conflict
Definition at line 1128 of file cons_logicor.c.
References disableCons(), FALSE, NULL, SCIP_CALL, SCIP_CONFTYPE_PROPAGATION, SCIP_OKAY, SCIP_STAGE_SOLVING, SCIPaddConflictBinvar(), SCIPanalyzeConflictCons(), SCIPconsGetData(), SCIPgetStage(), SCIPinitConflictAnalysis(), SCIPinProbing(), and SCIPisConflictAnalysisApplicable().
Referenced by applyFixings(), and processWatchedVars().
◆ disableCons()
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static |
disables or deletes the given constraint, depending on the current depth
- Parameters
-
scip SCIP data structure cons bound disjunction constraint to be disabled
Definition at line 1159 of file cons_logicor.c.
References mergeMultiples(), SCIP_CALL, SCIP_OKAY, SCIPconsGetName(), SCIPconsGetValidDepth(), SCIPdebugMsg, SCIPdelCons(), SCIPdisableCons(), and SCIPgetDepth().
Referenced by analyzeConflict(), and processWatchedVars().
◆ mergeMultiples()
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static |
find pairs of negated variables in constraint: constraint is redundant find sets of equal variables in constraint: multiple entries of variable can be replaced by single entry
- Parameters
-
scip SCIP data structure cons logic or constraint eventhdlr event handler to call for the event processing entries array to store whether two positions in constraints represent the same variable nentries pointer for array size, if array will be to small it's corrected redundant returns whether a variable fixed to one exists in the constraint nchgcoefs pointer to count number of changed/deleted coefficients
Definition at line 1183 of file cons_logicor.c.
References delCoefPos(), FALSE, NULL, processWatchedVars(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_NEGATED, SCIP_VARTYPE_BINARY, SCIP_VARTYPE_IMPLINT, SCIP_VARTYPE_INTEGER, SCIPallocBufferArray, SCIPconsGetData(), SCIPconsGetName(), SCIPdebugMsg, SCIPfreeBufferArray, SCIPgetNBinVars(), SCIPgetNImplVars(), SCIPgetNIntVars(), SCIPvarGetName(), SCIPvarGetNegationVar(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarIsActive(), SCIPvarIsBinary(), SCIPvarIsNegated(), and TRUE.
Referenced by disableCons(), prepareCons(), and SCIPcleanupConssLogicor().
◆ processWatchedVars()
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static |
checks constraint for violation only looking at the watched variables, applies fixings if possible
- Parameters
-
scip SCIP data structure cons logic or constraint to be processed eventhdlr event handler to call for the event processing cutoff pointer to store TRUE, if the node can be cut off reduceddom pointer to store TRUE, if a domain reduction was found addcut pointer to store whether this constraint must be added as a cut mustcheck pointer to store whether this constraint must be checked for feasibility
Definition at line 1332 of file cons_logicor.c.
References AGEINCREASE, analyzeConflict(), CONSHDLR_NAME, disableCons(), FALSE, isConsViolated(), NULL, SCIP_Bool, SCIP_BRANCHDIR_DOWNWARDS, SCIP_CALL, SCIP_Longint, SCIP_LONGINT_MAX, SCIP_OKAY, SCIPaddConsAge(), SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetName(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPdisableConsPropagation(), SCIPgetDepth(), SCIPinferBinvarCons(), SCIPisFeasEQ(), SCIPresetConsAge(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetNBranchingsCurrentRun(), SCIPvarGetUbLocal(), switchWatchedvars(), and TRUE.
Referenced by enforcePseudo(), mergeMultiples(), and separateCons().
◆ isConsViolated()
checks constraint for violation, returns TRUE iff constraint is feasible
- Parameters
-
scip SCIP data structure cons logic or constraint to be checked sol primal CIP solution
Definition at line 1550 of file cons_logicor.c.
References createRow(), NULL, SCIP_Real, SCIPconsGetData(), SCIPgetSolVal(), SCIPisFeasGE(), SCIPisFeasLE(), SCIPisFeasLT(), SCIPrelDiff(), SCIPupdateSolLPConsViolation(), and SCIPvarIsBinary().
Referenced by enforcePseudo(), processWatchedVars(), and separateCons().
◆ createRow()
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static |
creates an LP row in a logic or constraint data object
- Parameters
-
scip SCIP data structure cons logic or constraint
Definition at line 1593 of file cons_logicor.c.
References addCut(), NULL, SCIP_CALL, SCIP_OKAY, SCIPaddVarsToRowSameCoef(), SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsRemovable(), SCIPcreateEmptyRowCons(), and SCIPinfinity().
Referenced by addCut(), and isConsViolated().
◆ addCut()
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static |
adds logic or constraint as cut to the LP
- Parameters
-
scip SCIP data structure cons logic or constraint cutoff whether a cutoff has been detected
Definition at line 1614 of file cons_logicor.c.
References createRow(), FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPaddRow(), SCIPconsGetData(), SCIPconsGetName(), SCIPdebugMsg, SCIProwIsInLP(), and separateCons().
Referenced by createRow(), SCIP_DECL_CONSINITLP(), and separateCons().
◆ separateCons()
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static |
checks constraint for violation, and adds it as a cut if possible
- Parameters
-
scip SCIP data structure cons logic or constraint to be separated sol primal CIP solution, NULL for current LP solution eventhdlr event handler to call for the event processing cutoff pointer to store TRUE, if the node can be cut off separated pointer to store TRUE, if a cut was found reduceddom pointer to store TRUE, if a domain reduction was found
Definition at line 1647 of file cons_logicor.c.
References addCut(), CONSHDLR_NAME, enforcePseudo(), FALSE, isConsViolated(), NULL, processWatchedVars(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetName(), SCIPconsIsPropagationEnabled(), SCIPdebugMsg, SCIPgetRowLPFeasibility(), SCIPisFeasNegative(), SCIPresetConsAge(), SCIProwIsInLP(), and TRUE.
Referenced by addCut(), and enforceConstraint().
◆ enforcePseudo()
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static |
enforces the pseudo solution on the given constraint
- Parameters
-
scip SCIP data structure cons logic or constraint to be separated eventhdlr event handler to call for the event processing cutoff pointer to store TRUE, if the node can be cut off infeasible pointer to store TRUE, if the constraint was infeasible reduceddom pointer to store TRUE, if a domain reduction was found solvelp pointer to store TRUE, if the LP has to be solved
Definition at line 1724 of file cons_logicor.c.
References consdataSort(), CONSHDLR_NAME, FALSE, isConsViolated(), NULL, processWatchedVars(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPconsIsPropagationEnabled(), SCIPhasCurrentNodeLP(), SCIPresetConsAge(), and TRUE.
Referenced by separateCons().
◆ consdataSort()
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static |
sorts logicor constraint's variables by non-decreasing variable index
- Parameters
-
consdata linear constraint data
Definition at line 1780 of file cons_logicor.c.
References NULL, SCIP_Bool, SCIP_DECL_HASHGETKEY(), SCIPsortedvecFindPtr(), SCIPsortPtr(), SCIPvarCompare(), and TRUE.
Referenced by detectRedundantConstraints(), enforcePseudo(), removeRedundantConssAndNonzeros(), and removeRedundantNonZeros().
◆ SCIP_DECL_HASHGETKEY()
|
static |
gets the key of the given element
Definition at line 1861 of file cons_logicor.c.
Referenced by consdataSort().
◆ SCIP_DECL_HASHKEYEQ()
|
static |
returns TRUE iff both keys are equal; two constraints are equal if they have the same variables
Definition at line 1869 of file cons_logicor.c.
◆ SCIP_DECL_HASHKEYVAL()
|
static |
returns the hash value of the key
Definition at line 1915 of file cons_logicor.c.
◆ detectRedundantConstraints()
|
static |
compares each constraint with all other constraints for a possible duplication and removes duplicates using a hash table; also
- Parameters
-
scip SCIP data structure blkmem block memory conss constraint set nconss number of constraints in constraint set firstchange pointer to store first changed constraint ndelconss pointer to count number of deleted constraints
Definition at line 1939 of file cons_logicor.c.
References consdataSort(), HASHSIZE_LOGICORCONS, MAX, NULL, removeRedundantCons(), SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsGetPos(), SCIPconsIsActive(), SCIPconsIsModifiable(), SCIPdelCons(), SCIPhashtableCreate(), SCIPhashtableFree(), SCIPhashtableInsert(), SCIPhashtableRetrieve(), and SCIPupdateConsFlags().
◆ removeRedundantCons()
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static |
removes the redundant second constraint and updates the flags of the first one
- Parameters
-
scip SCIP data structure cons0 constraint that should stay cons1 constraint that should be deleted ndelconss pointer to count number of deleted constraints
Definition at line 2028 of file cons_logicor.c.
References calcSignature(), NULL, SCIP_CALL, SCIP_OKAY, SCIPconsGetName(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPdelCons(), and SCIPupdateConsFlags().
Referenced by detectRedundantConstraints(), and removeRedundantConss().
◆ calcSignature()
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static |
compute and return a signature for given variables
- Parameters
-
vars variables to calculate the signature for nvars number of variables to calculate the signature for
Definition at line 2055 of file cons_logicor.c.
References consdataCalcSignature(), NULL, and SCIPvarGetIndex().
Referenced by consdataCalcSignature(), removeRedundantCons(), and removeRedundantNonZeros().
◆ consdataCalcSignature()
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static |
compute the constraint signature which is used to detect constraints, that contain potentially the same set of variables
- Parameters
-
consdata logicor constraint data
Definition at line 2078 of file cons_logicor.c.
References calcSignature(), removeConsFromOccurList(), and TRUE.
Referenced by calcSignature(), removeRedundantConssAndNonzeros(), and removeRedundantNonZeros().
◆ removeConsFromOccurList()
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static |
remove a constraint from the column representation
- Parameters
-
cons logicor constraint varstopos map for mapping variables to positions in the occurlist occurlist column representation of logicor constraints noccurlistentries arrray with number of constraints for each variable in the occurlist occurlistlength number of columns in the occurlist
Definition at line 2091 of file cons_logicor.c.
References findShortestOccurlist(), NULL, SCIPconsGetData(), SCIPconsIsActive(), SCIPhashmapExists(), and SCIPhashmapGetImageInt().
Referenced by consdataCalcSignature(), removeRedundantConss(), and removeRedundantNonZeros().
◆ findShortestOccurlist()
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static |
determine shortest constraint list in column representation
- Parameters
-
vars variables to find the shortestlist for nvars number of variables varstopos map for mapping variables to positions in the occurlist occurlist column representation of logicor constraints noccurlistentries arrray with number of constraints for each variable in the occurlist occurlistlength number of columns in the occurlist nentries pointer to store the number of entries in the shortest list shortestlist pointer to store smallest array with constraints
Definition at line 2151 of file cons_logicor.c.
References NULL, removeRedundantConss(), SCIPhashmapExists(), and SCIPhashmapGetImageInt().
Referenced by removeConsFromOccurList(), removeRedundantConss(), and removeRedundantNonZeros().
◆ removeRedundantConss()
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static |
run a pairwise comparison for detecting subset-constraints of other constraint while using a signature
- Parameters
-
scip SCIP data structure cons logicor constraint to check if it covers another varstopos map for mapping variables to positions in the occurlist occurlist column representation of logicor constraints noccurlistentries arrray with number of constraints for each variable in the occurlist occurlistlength number of columns in the occurlist ndelconss pointer to store the number of deleted constraints
Definition at line 2206 of file cons_logicor.c.
References findShortestOccurlist(), NULL, removeConsFromOccurList(), removeRedundantCons(), SCIP_CALL, SCIP_DECL_SORTPTRCOMP(), SCIP_OKAY, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsModifiable(), and SCIPvarCompare().
Referenced by findShortestOccurlist(), and removeRedundantConssAndNonzeros().
◆ SCIP_DECL_SORTPTRCOMP()
|
static |
compararer for sorting constraints after their number of variables
Definition at line 2324 of file cons_logicor.c.
Referenced by removeRedundantConss().
◆ addConsToOccurList()
|
static |
add a constraint to the column representation
- Parameters
-
scip SCIP data structure cons logicor constraint varstopos map for mapping variables to positions in the occurlist occurlist column representation of logicor constraints noccurlistentries arrray with number of constraints for each variable in the occurlist occurlistsizes array of sizes for each variable in the occurlist occurlistlength number of columns in the occurlist occurlistsize size of occurlist
Definition at line 2343 of file cons_logicor.c.
References NULL, removeRedundantNonZeros(), SCIP_CALL, SCIP_LOCKTYPE_MODEL, SCIP_OKAY, SCIPallocBufferArray, SCIPcalcMemGrowSize(), SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPhashmapExists(), SCIPhashmapGetImageInt(), SCIPhashmapInsertInt(), SCIPreallocBufferArray, SCIPvarGetNegatedVar(), SCIPvarGetNLocksDownType(), and SCIPvarIsActive().
Referenced by removeRedundantConssAndNonzeros().
◆ removeRedundantNonZeros()
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static |
run a pairwise comparison for the given variables against all constraits to detect redundant non-zeros in these constraints
- Parameters
-
scip SCIP data structure cons logicor constraint to check if it covers another artvar artificial negated variable of constraint artpos position to replace constraint variable with artvar varstopos map for mapping variables to positions in the occurlist occurlist column representation of logicor constraints noccurlistentries number of constraints for each variable in the occurlist occurlistlength number of columns in the occurlist eventhdlr event handler nchgcoefs pointer to store the number of deleted non-zeros deleted pointer to store if cons will be deleted
Definition at line 2442 of file cons_logicor.c.
References calcSignature(), consdataCalcSignature(), consdataSort(), delCoefPos(), FALSE, findShortestOccurlist(), NULL, removeConsFromOccurList(), SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsActive(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPdelCons(), SCIPhashmapExists(), SCIPhashmapGetImageInt(), SCIPupdateConsFlags(), SCIPvarCompare(), SCIPvarGetName(), SCIPvarGetNegatedVar(), strengthenConss(), and TRUE.
Referenced by addConsToOccurList(), and strengthenConss().
◆ strengthenConss()
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static |
find and remove redundant non-zero entries
- Parameters
-
scip SCIP data structure conss sorted array of logicor constraint nconss number of sorted constraints varstopos map for mapping variables to positions in the occurlist occurlist column representation of logicor constraints noccurlistentries number of constraints for each variable in the occurlist occurlistlength number of columns in the occurlist eventhdlr event handler to call for the event processing ndelconss pointer to store the number of deleted constraints nchgcoefs pointer to store the number of remove coefficients
Definition at line 2687 of file cons_logicor.c.
References NULL, prepareCons(), removeRedundantNonZeros(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsDeleted(), SCIPconsIsModifiable(), SCIPhashmapExists(), and SCIPvarGetNegatedVar().
Referenced by removeRedundantConssAndNonzeros(), and removeRedundantNonZeros().
◆ prepareCons()
|
static |
prepares a constraint by removing fixings and merge it
- Parameters
-
scip SCIP data structure cons logic or constraint eventhdlr event handler to call for the event processing entries array to store whether two positions in constraints represent the same variable nentries pointer for array size, if array will be to small it's corrected redundant returns whether a variable fixed to one exists in the constraint nfixedvars pointer to count number of fixings nchgcoefs pointer to count number of changed/deleted coefficients ndelconss pointer to count number of deleted constraints cutoff pointer to store, if cut off appeared
Definition at line 2778 of file cons_logicor.c.
References applyFixings(), FALSE, mergeMultiples(), NULL, removeRedundantConssAndNonzeros(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsIsDeleted(), SCIPdebugMsg, SCIPdelCons(), SCIPfixVar(), and TRUE.
Referenced by removeConstraintsDueToNegCliques(), removeRedundantConssAndNonzeros(), shortenConss(), and strengthenConss().
◆ removeRedundantConssAndNonzeros()
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static |
find covered/subsumed constraints and redundant non-zero entries
covered: e.g.: c1: x1 + x2 + x3 >= 1 c2: x1 + x2 + x3 + x4 >= 1
strengthen: e.g.: c1: x1 + x2 + x3 >= 1 c2: x1 + x2 + ~x3 + x4 >= 1
=> c2: x1 + x2 + x4 >= 1
- See also
- "Effective Preprocessing in SAT through Variable and Clause Elimination" by Niklas En and Armin Biere
- Parameters
-
scip SCIP data structure conss array of logicor constraints nconss number of logicor constraints entries array to store whether two positions in constraints represent the same variable nentries pointer for array size, if array will be to small it's corrected eventhdlr event handler to call for the event processing usestrengthening should we try to strengthen constraints by removing superflous non-zeros? firstchange pointer to store first changed constraint nfixedvars pointer to count number of fixings ndelconss pointer to store the number of deleted constraints nchgcoefs pointer to store the number of deleted coefficients cutoff pointer to store, if cut off appeared
Definition at line 2874 of file cons_logicor.c.
References addConsToOccurList(), BMSclearMemoryArray, consdataCalcSignature(), consdataSort(), FALSE, NULL, prepareCons(), removeRedundantConss(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPallocBufferArray, SCIPblkmem(), SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsDeleted(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPduplicateBufferArray, SCIPfreeBufferArray, SCIPfreeBufferArrayNull, SCIPgetNContVars(), SCIPgetNVars(), SCIPhashmapCreate(), SCIPhashmapFree(), SCIPsortPtr(), strengthenConss(), and TRUE.
Referenced by prepareCons().
◆ shortenConss()
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static |
try to tighten constraints by reducing the number of variables in the constraints using implications and cliques, also derive fixations through them,
- See also
- SCIPshrinkDisjunctiveVarSet()
- Parameters
-
scip SCIP data structure conshdlrdata logic or constraint handler data eventhdlr event handler to call for the event processing conss all constraints nconss number of constraints entries array to store whether two positions in constraints represent the same variable nentries pointer for array size, if array will be to small it's corrected nfixedvars pointer to count number of fixings ndelconss pointer to count number of deleted constraints nchgcoefs pointer to count number of changed/deleted coefficients cutoff pointer to store, if cut off appeared
Definition at line 3121 of file cons_logicor.c.
References BMSclearMemoryArray, delCoefPos(), FALSE, MAX_CONSLENGTH, NULL, prepareCons(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_NEGATED, SCIPallocBufferArray, SCIPallocCleanBufferArray, SCIPcleanupCliques(), SCIPconsGetData(), SCIPconsIsDeleted(), SCIPdebugMsg, SCIPdelCons(), SCIPfixVar(), SCIPfreeBufferArray, SCIPfreeCleanBufferArray, SCIPgetNCliques(), SCIPgetNContVars(), SCIPgetNImplications(), SCIPgetNVars(), SCIPshrinkDisjunctiveVarSet(), SCIPvarGetNegationVar(), SCIPvarGetStatus(), SCIPvarIsActive(), and TRUE.
◆ removeConstraintsDueToNegCliques()
|
static |
try to find a negated clique in a constraint which makes this constraint redundant but we need to keep the negated clique information alive, so we create a corresponding set-packing constraint
- Parameters
-
scip SCIP data structure conshdlr logicor constraint handler conshdlrsetppc setppc constraint handler, or NULL eventhdlr event handler to call for the event processing conss all constraints nconss number of constraints entries array to store whether two positions in constraints represent the same variable nentries pointer for array size, if array will be to small it's corrected nfixedvars pointer to count number of fixings ndelconss pointer to count number of deleted constraints nupgdconss pointer to count number of upgraded constraints nchgcoefs pointer to count number of changed/deleted coefficients cutoff pointer to store, if cut off appeared
Definition at line 3317 of file cons_logicor.c.
References BMScopyMemoryArray, delCoefPos(), FALSE, fixDeleteOrUpgradeCons(), MAXCOMPARISONS, NULL, prepareCons(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_NEGATED, SCIPaddCons(), SCIPallocBufferArray, SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsSetpack(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPdelCons(), SCIPfreeBufferArray, SCIPgetNCliques(), SCIPgetNContVars(), SCIPgetNImplications(), SCIPgetNVars(), SCIPisStopped(), SCIPreleaseCons(), SCIPvarGetName(), SCIPvarGetNCliques(), SCIPvarGetNegatedVar(), SCIPvarGetNegationVar(), SCIPvarGetNImpls(), SCIPvarGetStatus(), SCIPvarIsActive(), SCIPvarIsNegated(), SCIPvarsHaveCommonClique(), TRUE, and w.
◆ fixDeleteOrUpgradeCons()
|
static |
handle all cases with less than three variables in a logicor constraint
in case a constraint has zero variables left, we detected infeasibility in case a constraint has one variables left, we will fix it to one in case a constraint has two variables left, we will add the implication and upgrade it to a set-packing constraint
- Parameters
-
scip SCIP data structure cons logic or constraint eventhdlr event handler to call for the event processing conshdlrlinear linear constraint handler, or NULL conshdlrsetppc setppc constraint handler, or NULL nfixedvars pointer to count number of fixings nchgbds pointer to count number of tightened bounds nchgcoefs pointer to count number of changed/deleted coefficients ndelconss pointer to count number of deleted constraints naddconss pointer to count number of added constraints nupgdconss pointer to count number of upgraded constraints cutoff pointer to store TRUE, if the node can be cut off
Definition at line 3591 of file cons_logicor.c.
References applyFixings(), createNormalizedLogicor(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIPaddClique(), SCIPaddCons(), SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsLinear(), SCIPcreateConsSetpack(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPdelCons(), SCIPfixVar(), SCIPgetNegatedVar(), SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetName(), SCIPvarGetStatus(), and TRUE.
Referenced by removeConstraintsDueToNegCliques().
◆ createNormalizedLogicor()
|
static |
creates and captures a normalized (with all coefficients +1) logic or constraint
- Parameters
-
scip SCIP data structure cons pointer to hold the created constraint name name of constraint nvars number of variables in the constraint vars array with variables of constraint entries vals array with coefficients (+1.0 or -1.0) mult multiplier on the coefficients(+1 or -1) initial should the LP relaxation of constraint be in the initial LP? Usually set to TRUE. Set to FALSE for 'lazy constraints'. separate should the constraint be separated during LP processing? Usually set to TRUE. enforce should the constraint be enforced during node processing? TRUE for model constraints, FALSE for additional, redundant constraints. check should the constraint be checked for feasibility? TRUE for model constraints, FALSE for additional, redundant constraints. propagate should the constraint be propagated during node processing? Usually set to TRUE. local is constraint only valid locally? Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints. modifiable is constraint modifiable (subject to column generation)? Usually set to FALSE. In column generation applications, set to TRUE if pricing adds coefficients to this constraint. dynamic is constraint subject to aging? Usually set to FALSE. Set to TRUE for own cuts which are separated as constraints. removable should the relaxation be removed from the LP due to aging or cleanup? Usually set to FALSE. Set to TRUE for 'lazy constraints' and 'user cuts'. stickingatnode should the constraint always be kept at the node where it was added, even if it may be moved to a more global node? Usually set to FALSE. Set to TRUE to for constraints that represent node data.
Definition at line 3776 of file cons_logicor.c.
References NULL, SCIP_CALL, SCIP_DECL_LINCONSUPGD(), SCIP_OKAY, SCIPallocBufferArray, SCIPcreateConsLogicor(), SCIPfreeBufferArray, and SCIPgetNegatedVar().
Referenced by fixDeleteOrUpgradeCons().
◆ SCIP_DECL_LINCONSUPGD()
|
static |
Definition at line 3842 of file cons_logicor.c.
Referenced by createNormalizedLogicor().
◆ enforceConstraint()
|
static |
helper function to enforce constraints
- Parameters
-
scip SCIP data structure conshdlr constraint handler conss constraints to process nconss number of constraints nusefulconss number of useful (non-obsolete) constraints to process sol solution to enforce (NULL for the LP solution) result pointer to store the result of the enforcing call
Definition at line 3882 of file cons_logicor.c.
References CONSHDLR_NAME, FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_CUTOFF, SCIP_DECL_CONSHDLRCOPY(), SCIP_FEASIBLE, SCIP_OKAY, SCIP_REDUCEDDOM, SCIP_SEPARATED, SCIPconshdlrGetData(), SCIPconshdlrGetName(), SCIPdebugMsg, and separateCons().
◆ SCIP_DECL_CONSHDLRCOPY()
|
static |
copy method for constraint handler plugins (called when SCIP copies plugins)
Definition at line 3944 of file cons_logicor.c.
Referenced by enforceConstraint().
◆ SCIP_DECL_CONSFREE()
|
static |
destructor of constraint handler to free constraint handler data (called when SCIP is exiting)
Definition at line 3960 of file cons_logicor.c.
◆ SCIP_DECL_CONSINITPRE()
|
static |
presolving initialization method of constraint handler (called when presolving is about to begin)
Definition at line 3982 of file cons_logicor.c.
◆ SCIP_DECL_CONSEXITPRE()
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presolving deinitialization method of constraint handler (called after presolving has been finished)
Definition at line 4015 of file cons_logicor.c.
◆ SCIP_DECL_CONSEXITSOL()
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solving process deinitialization method of constraint handler (called before branch and bound process data is freed)
Definition at line 4072 of file cons_logicor.c.
References NULL, SCIP_CALL, SCIP_DECL_CONSDELETE(), SCIP_OKAY, SCIPconsGetData(), and SCIPreleaseRow().
◆ SCIP_DECL_CONSDELETE()
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frees specific constraint data
Definition at line 4095 of file cons_logicor.c.
Referenced by SCIP_DECL_CONSEXITSOL().
◆ SCIP_DECL_CONSTRANS()
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transforms constraint data into data belonging to the transformed problem
Definition at line 4126 of file cons_logicor.c.
◆ SCIP_DECL_CONSINITLP()
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LP initialization method of constraint handler (called before the initial LP relaxation at a node is solved)
Definition at line 4159 of file cons_logicor.c.
References addCut(), SCIP_CALL, SCIP_DECL_CONSSEPALP(), SCIP_OKAY, and SCIPconsIsInitial().
◆ SCIP_DECL_CONSSEPALP()
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separation method of constraint handler for LP solutions
Definition at line 4177 of file cons_logicor.c.
Referenced by SCIP_DECL_CONSINITLP().
◆ SCIP_DECL_CONSSEPASOL()
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separation method of constraint handler for arbitrary primal solutions
Definition at line 4224 of file cons_logicor.c.
◆ SCIP_DECL_CONSENFOLP()
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constraint enforcing method of constraint handler for LP solutions
Definition at line 4271 of file cons_logicor.c.
◆ SCIP_DECL_CONSENFORELAX()
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constraint enforcing method of constraint handler for relaxation solutions
Definition at line 4281 of file cons_logicor.c.
◆ SCIP_DECL_CONSENFOPS()
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constraint enforcing method of constraint handler for pseudo solutions
Definition at line 4291 of file cons_logicor.c.
◆ SCIP_DECL_CONSCHECK()
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feasibility check method of constraint handler for integral solutions
Definition at line 4338 of file cons_logicor.c.
◆ SCIP_DECL_CONSPROP()
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domain propagation method of constraint handler
Definition at line 4389 of file cons_logicor.c.
◆ SCIP_DECL_CONSPRESOL()
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presolving method of constraint handler
Definition at line 4434 of file cons_logicor.c.
◆ SCIP_DECL_CONSRESPROP()
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propagation conflict resolving method of constraint handler
Definition at line 4646 of file cons_logicor.c.
◆ SCIP_DECL_CONSLOCK()
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variable rounding lock method of constraint handler
Definition at line 4699 of file cons_logicor.c.
◆ SCIP_DECL_CONSACTIVE()
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constraint activation notification method of constraint handler
Definition at line 4719 of file cons_logicor.c.
◆ SCIP_DECL_CONSDEACTIVE()
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constraint deactivation notification method of constraint handler
Definition at line 4758 of file cons_logicor.c.
◆ SCIP_DECL_CONSPRINT()
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constraint display method of constraint handler
Definition at line 4803 of file cons_logicor.c.
◆ SCIP_DECL_CONSCOPY()
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constraint copying method of constraint handler
Definition at line 4816 of file cons_logicor.c.
◆ SCIP_DECL_CONSPARSE()
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constraint parsing method of constraint handler
Definition at line 4842 of file cons_logicor.c.
◆ SCIP_DECL_CONSGETVARS()
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constraint method of constraint handler which returns the variables (if possible)
Definition at line 4937 of file cons_logicor.c.
◆ SCIP_DECL_CONSGETNVARS()
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constraint method of constraint handler which returns the number of variables (if possible)
Definition at line 4959 of file cons_logicor.c.
◆ SCIP_DECL_EVENTEXEC()
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Definition at line 4977 of file cons_logicor.c.
◆ SCIP_DECL_CONFLICTEXEC()
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Definition at line 5039 of file cons_logicor.c.