SCIP
Solving Constraint Integer Programs
Solving Constraint Integer Programs
Constraint handler for the set partitioning / packing / covering constraints \(1^T x\ \{=, \le, \ge\}\ 1\).
Definition in file cons_setppc.c.
#include <assert.h>#include <string.h>#include <limits.h>#include <stdio.h>#include <ctype.h>#include "scip/cons_setppc.h"#include "scip/cons_linear.h"#include "scip/cons_quadratic.h"#include "scip/pub_misc.h"Go to the source code of this file.
Functions | |
| static int | setppcCompare (SCIP_CONS *const cons1, SCIP_CONS *const cons2) |
| static | SCIP_DECL_SORTPTRCOMP (setppcConssSort) |
| static int | setppcCompare2 (SCIP_CONS *const cons1, SCIP_CONS *const cons2) |
| static | SCIP_DECL_SORTPTRCOMP (setppcConssSort2) |
| 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 SCIP_RETCODE | 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, SCIP_SETPPCTYPE setppctype) |
| static SCIP_RETCODE | consdataCreateTransformed (SCIP *scip, SCIP_CONSDATA **consdata, int nvars, SCIP_VAR **vars, SCIP_SETPPCTYPE setppctype) |
| static SCIP_RETCODE | consdataFree (SCIP *scip, SCIP_CONSDATA **consdata) |
| static SCIP_RETCODE | consdataPrint (SCIP *scip, SCIP_CONSDATA *consdata, FILE *file) |
| static uint64_t | consdataGetSignature (SCIP_CONSDATA *consdata) |
| static void | consdataSort (SCIP_CONSDATA *consdata) |
| static SCIP_RETCODE | setSetppcType (SCIP *scip, SCIP_CONS *cons, SCIP_SETPPCTYPE setppctype) |
| static SCIP_RETCODE | catchEvent (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, int pos) |
| static SCIP_RETCODE | dropEvent (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr, int pos) |
| static SCIP_RETCODE | catchAllEvents (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr) |
| static SCIP_RETCODE | dropAllEvents (SCIP *scip, SCIP_CONS *cons, SCIP_EVENTHDLR *eventhdlr) |
| static SCIP_RETCODE | addCoef (SCIP *scip, SCIP_CONS *cons, SCIP_VAR *var) |
| static SCIP_RETCODE | delCoefPos (SCIP *scip, SCIP_CONS *cons, int pos) |
| static SCIP_RETCODE | dualPresolving (SCIP *scip, SCIP_CONS *cons, int *nfixedvars, int *ndelconss, SCIP_RESULT *result) |
| static SCIP_RETCODE | mergeMultiples (SCIP *scip, SCIP_CONS *cons, int *nfixedvars, int *ndelconss, int *nchgcoefs, SCIP_Bool *cutoff) |
| static SCIP_RETCODE | applyFixings (SCIP *scip, SCIP_CONS *cons, int *naddconss, int *ndelconss, int *nfixedvars, SCIP_Bool *cutoff) |
| static SCIP_RETCODE | analyzeConflictZero (SCIP *scip, SCIP_CONS *cons) |
| static SCIP_RETCODE | analyzeConflictOne (SCIP *scip, SCIP_CONS *cons) |
| static SCIP_RETCODE | processFixings (SCIP *scip, SCIP_CONS *cons, SCIP_Bool *cutoff, int *nfixedvars, SCIP_Bool *addcut, SCIP_Bool *mustcheck) |
| static SCIP_Bool | checkCons (SCIP *scip, SCIP_CONSDATA *consdata, SCIP_SOL *sol) |
| static SCIP_RETCODE | createRow (SCIP *scip, SCIP_CONS *cons) |
| static SCIP_RETCODE | addCut (SCIP *scip, SCIP_CONS *cons, SCIP_SOL *sol, SCIP_Bool *cutoff) |
| static SCIP_RETCODE | separateCons (SCIP *scip, SCIP_CONS *cons, SCIP_SOL *sol, SCIP_Bool lpfeas, SCIP_Bool *cutoff, SCIP_Bool *separated, SCIP_Bool *reduceddom) |
| static SCIP_RETCODE | enforcePseudo (SCIP *scip, SCIP_CONS *cons, SCIP_Bool *cutoff, SCIP_Bool *infeasible, SCIP_Bool *reduceddom, SCIP_Bool *solvelp) |
| static | SCIP_DECL_HASHGETKEY (hashGetKeySetppccons) |
| static | SCIP_DECL_HASHKEYEQ (hashKeyEqSetppccons) |
| static | SCIP_DECL_HASHKEYVAL (hashKeyValSetppccons) |
| static SCIP_RETCODE | addExtraCliques (SCIP *const scip, SCIP_VAR **const binvars, int const nbinvars, int *const cliquepartition, int const ncliques, SCIP_CONS **const usefulconss, int *const nusefulconss, int const nrounds, int *const nfixedvars, int *const naddconss, int *const ndelconss, int *const nchgcoefs, SCIP_Bool *const cutoff) |
| static SCIP_RETCODE | collectCliqueConss (SCIP *const scip, SCIP_CONS **const conss, int const nconss, SCIP_CONS **const usefulconss, int *const nusefulconss, int *const nfixedvars, int *const ndelconss, int *const nchgcoefs, SCIP_Bool *const cutoff) |
| static SCIP_RETCODE | collectCliqueData (SCIP *const scip, SCIP_CONS **const usefulconss, int const nusefulconss, SCIP_VAR **const usefulvars, int *const nusefulvars, SCIP_HASHMAP *const vartoindex, int *const varnconss, int *const maxnvarconsidx, int **const varconsidxs, int *const maxnvars) |
| static void | deleteCliqueDataEntry (SCIP_VAR *const var, int const considx, SCIP_HASHMAP *const vartoindex, int *const varnconss, int **const varconsidxs) |
| static SCIP_RETCODE | addCliqueDataEntry (SCIP *const scip, SCIP_VAR *const addvar, int const considx, SCIP_Bool const maybenew, SCIP_VAR **const usefulvars, int *const nusefulvars, SCIP_HASHMAP *const vartoindex, int *const varnconss, int *const maxnvarconsidx, int **const varconsidxs) |
| static SCIP_RETCODE | presolvePropagateCons (SCIP *const scip, SCIP_CONS *const cons, SCIP_Bool const aggregate, SCIP_VAR **undoneaggrvars, SCIP_Bool *undoneaggrtypes, int *const naggregations, int *const saggregations, int *const nfixedvars, int *const naggrvars, int *const ndelconss, SCIP_Bool *const cutoff) |
| static SCIP_RETCODE | checkForOverlapping (SCIP *const scip, SCIP_CONS *const cons, int const considx, int const endidx, SCIP_CONS **const usefulconss, int const nusefulconss, SCIP_VAR **const usefulvars, int *const nusefulvars, SCIP_HASHMAP *const vartoindex, int *const varnconss, int *const maxnvarconsidx, int **const varconsidxs, int *const countofoverlapping, SCIP_Bool const shrinking, SCIP_Bool *const chgcons, SCIP_VAR **undoneaggrvars, SCIP_Bool *undoneaggrtypes, int *const naggregations, int *const saggregations, int *const nfixedvars, int *const naggrvars, int *const nchgcoefs, int *const ndelconss, SCIP_Bool *const cutoff) |
| static SCIP_RETCODE | liftCliqueVariables (SCIP *const scip, SCIP_CONS *const cons, int const arraypos, SCIP_VAR **const usefulvars, int *const nusefulvars, int const endidx, SCIP_Bool **cliquevalues, SCIP_HASHMAP *const vartoindex, int *const varnconss, int *const maxnvarconsidx, int **const varconsidxs, int *const maxnvars, int *const nadded, SCIP_Bool *const chgcons, int *const nfixedvars, int *const ndelconss, SCIP_Bool *const cutoff) |
| static SCIP_RETCODE | performAggregations (SCIP *const scip, SCIP_CONSHDLRDATA *conshdlrdata, SCIP_VAR **const undoneaggrvars, SCIP_Bool *const undoneaggrtypes, int const naggregations, int *const naggrvars, SCIP_Bool *const cutoff) |
| static SCIP_RETCODE | preprocessCliques (SCIP *const scip, SCIP_CONSHDLRDATA *conshdlrdata, SCIP_CONS **const conss, int const nconss, int const nrounds, int *const firstchange, int *const firstclique, int *const lastclique, int *const nfixedvars, int *const naggrvars, int *const ndelconss, int *const nchgcoefs, SCIP_Bool *const cutoff) |
| static SCIP_RETCODE | addCliques (SCIP *scip, SCIP_CONS **conss, int nconss, int firstclique, int lastclique, int *naddconss, int *ndelconss, int *nchgbds, SCIP_Bool *cutoff) |
| static SCIP_RETCODE | multiAggregateBinvar (SCIP *scip, SCIP_Bool linearconshdlrexist, SCIP_VAR **vars, int nvars, int pos, SCIP_Bool *infeasible, SCIP_Bool *aggregated) |
| static SCIP_RETCODE | removeDoubleAndSingletonsAndPerformDualpresolve (SCIP *scip, SCIP_CONS **conss, int nconss, SCIP_Bool dualpresolvingenabled, SCIP_Bool linearconshdlrexist, int *nfixedvars, int *naggrvars, int *ndelconss, int *nchgcoefs, int *nchgsides, SCIP_Bool *cutoff) |
| static SCIP_RETCODE | detectRedundantConstraints (SCIP *scip, BMS_BLKMEM *blkmem, SCIP_CONS **conss, int nconss, int *firstchange, int *ndelconss, int *nchgsides) |
| static SCIP_RETCODE | removeRedundantCons (SCIP *scip, SCIP_CONS *cons0, SCIP_CONS *cons1, int *ndelconss) |
| static SCIP_RETCODE | fixAdditionalVars (SCIP *scip, SCIP_CONS *cons0, SCIP_CONS *cons1, SCIP_Bool *cutoff, int *nfixedvars) |
| static SCIP_RETCODE | processContainedCons (SCIP *scip, SCIP_CONS *cons0, SCIP_CONS *cons1, SCIP_Bool *cutoff, int *nfixedvars, int *ndelconss, int *nchgsides) |
| static SCIP_RETCODE | removeRedundantConstraints (SCIP *scip, SCIP_CONS **conss, int firstchange, int chkind, SCIP_Bool *cutoff, int *nfixedvars, int *ndelconss, int *nchgsides) |
| static SCIP_RETCODE | performVarDeletions (SCIP *scip, SCIP_CONSHDLR *conshdlr, SCIP_CONS **conss, int nconss) |
| static SCIP_RETCODE | enforceConstraint (SCIP *scip, SCIP_CONSHDLR *conshdlr, SCIP_CONS **conss, int nconss, int nusefulconss, SCIP_SOL *sol, SCIP_RESULT *result) |
| static SCIP_RETCODE | createConsSetppc (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_SETPPCTYPE setppctype, 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_RETCODE | createNormalizedSetppc (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_Real *vals, int mult, SCIP_SETPPCTYPE setppctype, 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 (linconsUpgdSetppc) |
| static | SCIP_DECL_QUADCONSUPGD (quadraticUpgdSetppc) |
| static | SCIP_DECL_CONSHDLRCOPY (conshdlrCopySetppc) |
| static | SCIP_DECL_CONSFREE (consFreeSetppc) |
| static | SCIP_DECL_CONSINIT (consInitSetppc) |
| static | SCIP_DECL_CONSEXITPRE (consExitpreSetppc) |
| static | SCIP_DECL_CONSEXITSOL (consExitsolSetppc) |
| static | SCIP_DECL_CONSDELETE (consDeleteSetppc) |
| static | SCIP_DECL_CONSTRANS (consTransSetppc) |
| static | SCIP_DECL_CONSINITLP (consInitlpSetppc) |
| static | SCIP_DECL_CONSSEPALP (consSepalpSetppc) |
| static | SCIP_DECL_CONSSEPASOL (consSepasolSetppc) |
| static | SCIP_DECL_CONSENFOLP (consEnfolpSetppc) |
| static | SCIP_DECL_CONSENFORELAX (consEnforelaxSetppc) |
| static | SCIP_DECL_CONSENFOPS (consEnfopsSetppc) |
| static | SCIP_DECL_CONSCHECK (consCheckSetppc) |
| static | SCIP_DECL_CONSPROP (consPropSetppc) |
| static | SCIP_DECL_CONSPRESOL (consPresolSetppc) |
| static | SCIP_DECL_CONSRESPROP (consRespropSetppc) |
| static | SCIP_DECL_CONSLOCK (consLockSetppc) |
| static | SCIP_DECL_CONSACTIVE (consActiveSetppc) |
| static | SCIP_DECL_CONSDELVARS (consDelvarsSetppc) |
| static | SCIP_DECL_CONSPRINT (consPrintSetppc) |
| static | SCIP_DECL_CONSCOPY (consCopySetppc) |
| static | SCIP_DECL_CONSPARSE (consParseSetppc) |
| static | SCIP_DECL_CONSGETVARS (consGetVarsSetppc) |
| static | SCIP_DECL_CONSGETNVARS (consGetNVarsSetppc) |
| static | SCIP_DECL_EVENTEXEC (eventExecSetppc) |
| static | SCIP_DECL_CONFLICTEXEC (conflictExecSetppc) |
| SCIP_RETCODE | SCIPincludeConshdlrSetppc (SCIP *scip) |
| SCIP_RETCODE | SCIPcreateConsSetpart (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 | SCIPcreateConsBasicSetpart (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars) |
| SCIP_RETCODE | SCIPcreateConsSetpack (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 | SCIPcreateConsBasicSetpack (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars) |
| SCIP_RETCODE | SCIPcreateConsSetcover (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 | SCIPcreateConsBasicSetcover (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars) |
| SCIP_RETCODE | SCIPaddCoefSetppc (SCIP *scip, SCIP_CONS *cons, SCIP_VAR *var) |
| int | SCIPgetNVarsSetppc (SCIP *scip, SCIP_CONS *cons) |
| SCIP_VAR ** | SCIPgetVarsSetppc (SCIP *scip, SCIP_CONS *cons) |
| SCIP_SETPPCTYPE | SCIPgetTypeSetppc (SCIP *scip, SCIP_CONS *cons) |
| SCIP_Real | SCIPgetDualsolSetppc (SCIP *scip, SCIP_CONS *cons) |
| SCIP_Real | SCIPgetDualfarkasSetppc (SCIP *scip, SCIP_CONS *cons) |
| SCIP_ROW * | SCIPgetRowSetppc (SCIP *scip, SCIP_CONS *cons) |
| int | SCIPgetNFixedonesSetppc (SCIP *scip, SCIP_CONS *cons) |
| int | SCIPgetNFixedzerosSetppc (SCIP *scip, SCIP_CONS *cons) |
| #define CONSHDLR_NAME "setppc" |
Definition at line 36 of file cons_setppc.c.
Referenced by createConsSetppc(), enforceConstraint(), enforcePseudo(), processFixings(), SCIP_DECL_CONSACTIVE(), SCIP_DECL_CONSHDLRCOPY(), SCIPaddCoefSetppc(), SCIPgetDualfarkasSetppc(), SCIPgetDualsolSetppc(), SCIPgetNFixedonesSetppc(), SCIPgetNVarsSetppc(), SCIPgetRowSetppc(), SCIPgetTypeSetppc(), SCIPgetVarsSetppc(), and separateCons().
| #define CONSHDLR_DESC "set partitioning / packing / covering constraints" |
Definition at line 37 of file cons_setppc.c.
| #define CONSHDLR_SEPAPRIORITY +700000 |
priority of the constraint handler for separation
Definition at line 38 of file cons_setppc.c.
| #define CONSHDLR_ENFOPRIORITY -700000 |
priority of the constraint handler for constraint enforcing
Definition at line 39 of file cons_setppc.c.
| #define CONSHDLR_CHECKPRIORITY -700000 |
priority of the constraint handler for checking feasibility
Definition at line 40 of file cons_setppc.c.
| #define CONSHDLR_SEPAFREQ 0 |
frequency for separating cuts; zero means to separate only in the root node
Definition at line 41 of file cons_setppc.c.
| #define CONSHDLR_PROPFREQ 1 |
frequency for propagating domains; zero means only preprocessing propagation
Definition at line 42 of file cons_setppc.c.
| #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 43 of file cons_setppc.c.
| #define CONSHDLR_MAXPREROUNDS -1 |
maximal number of presolving rounds the constraint handler participates in (-1: no limit)
Definition at line 46 of file cons_setppc.c.
| #define CONSHDLR_DELAYSEPA FALSE |
should separation method be delayed, if other separators found cuts?
Definition at line 47 of file cons_setppc.c.
| #define CONSHDLR_DELAYPROP FALSE |
should propagation method be delayed, if other propagators found reductions?
Definition at line 48 of file cons_setppc.c.
| #define CONSHDLR_NEEDSCONS TRUE |
should the constraint handler be skipped, if no constraints are available?
Definition at line 49 of file cons_setppc.c.
| #define CONSHDLR_PRESOLTIMING SCIP_PRESOLTIMING_ALWAYS |
Definition at line 51 of file cons_setppc.c.
| #define CONSHDLR_PROP_TIMING SCIP_PROPTIMING_BEFORELP |
Definition at line 52 of file cons_setppc.c.
| #define LINCONSUPGD_PRIORITY +700000 |
priority of the constraint handler for upgrading of linear constraints
Definition at line 54 of file cons_setppc.c.
| #define QUADCONSUPGD_PRIORITY +700000 |
priority of the constraint handler for upgrading of linear constraints
Definition at line 55 of file cons_setppc.c.
| #define EVENTHDLR_NAME "setppc" |
Definition at line 57 of file cons_setppc.c.
| #define EVENTHDLR_DESC "bound change event handler for set partitioning / packing / covering constraints" |
Definition at line 58 of file cons_setppc.c.
| #define CONFLICTHDLR_NAME "setppc" |
Definition at line 60 of file cons_setppc.c.
| #define CONFLICTHDLR_DESC "conflict handler creating set covering constraints" |
Definition at line 61 of file cons_setppc.c.
| #define CONFLICTHDLR_PRIORITY LINCONSUPGD_PRIORITY |
Definition at line 62 of file cons_setppc.c.
| #define DEFAULT_PRESOLPAIRWISE TRUE |
should pairwise constraint comparison be performed in presolving?
Definition at line 64 of file cons_setppc.c.
| #define HASHSIZE_SETPPCCONS 500 |
minimal size of hash table in setppc constraint tables
Definition at line 66 of file cons_setppc.c.
Referenced by detectRedundantConstraints().
| #define DEFAULT_PRESOLUSEHASHING TRUE |
should hash table be used for detecting redundant constraints in advance
Definition at line 67 of file cons_setppc.c.
| #define NMINCOMPARISONS 200000 |
number for minimal pairwise presolving comparisons
Definition at line 68 of file cons_setppc.c.
| #define MINGAINPERNMINCOMPARISONS 1e-06 |
minimal gain per minimal pairwise presolving comparisons to repeat pairwise comparison round
Definition at line 69 of file cons_setppc.c.
| #define DEFAULT_RANDSEED 3 |
Definition at line 71 of file cons_setppc.c.
| #define DEFAULT_NPSEUDOBRANCHES 2 |
number of children created in pseudo branching (0: disable branching)
Definition at line 79 of file cons_setppc.c.
| #define DEFAULT_DUALPRESOLVING TRUE |
should dual presolving steps be performed?
Definition at line 80 of file cons_setppc.c.
| #define DEFAULT_CLIQUELIFTING FALSE |
should we try to lift variables into other clique constraints, fix variables, aggregate them, and also shrink the amount of variables in clique constraints
Definition at line 82 of file cons_setppc.c.
| #define DEFAULT_ADDVARIABLESASCLIQUES FALSE |
should we try to generate extra clique constraint out of all binary variables to hopefully fasten the detection of redundant clique constraints
Definition at line 89 of file cons_setppc.c.
| #define DEFAULT_CLIQUESHRINKING TRUE |
should we try to shrink the number of variables in a clique constraints, by replacing more than one variable by only one
Definition at line 94 of file cons_setppc.c.
compares two active constraints of type set partitioning or set packing such that a "-1" is return if
| cons1 | first problem variable |
| cons2 | second problem variable |
Definition at line 173 of file cons_setppc.c.
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static |
sort constraints first after type (partitioning before packing before covering) and second after number of variables such that the partitioning constraints have increasing number of variables and the packing constraints have decreasing number of variables
Definition at line 213 of file cons_setppc.c.
compares two setppc constraints such that a "-1" is return if the first constraint is active and
| cons1 | first problem variable |
| cons2 | second problem variable |
Definition at line 229 of file cons_setppc.c.
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static |
sort constraints first after type (partitioning before packing before covering) and second after number of variables such that the partitioning constraints have increasing number of variables and the packing constraints have decreasing number of variables
Definition at line 278 of file cons_setppc.c.
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static |
installs rounding locks for the given variable in the given setppc constraint
| scip | SCIP data structure |
| cons | setppc constraint |
| var | variable of constraint entry |
Definition at line 286 of file cons_setppc.c.
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static |
removes rounding locks for the given variable in the given setppc constraint
| scip | SCIP data structure |
| cons | setppc constraint |
| var | variable of constraint entry |
Definition at line 321 of file cons_setppc.c.
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static |
creates constraint handler data for set partitioning / packing / covering constraint handler
| scip | SCIP data structure |
| conshdlrdata | pointer to store the constraint handler data |
| eventhdlr | event handler |
Definition at line 356 of file cons_setppc.c.
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static |
frees constraint handler data for set partitioning / packing / covering constraint handler
| scip | SCIP data structure |
| conshdlrdata | pointer to the constraint handler data |
Definition at line 385 of file cons_setppc.c.
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static |
ensures, that the vars array can store at least num entries
| scip | SCIP data structure |
| consdata | setppc constraint data |
| num | minimum number of entries to store |
Definition at line 525 of file cons_setppc.c.
References consdataCreate(), SCIP_CALL, SCIP_OKAY, SCIPcalcMemGrowSize(), and SCIPreallocBlockMemoryArray.
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static |
creates a set partitioning / packing / covering constraint data object
| scip | SCIP data structure |
| consdata | pointer to store the set partitioning / packing / covering constraint |
| nvars | number of variables in the constraint |
| vars | variables of the constraint |
| setppctype | type of constraint: set partitioning, packing, or covering constraint |
Definition at line 549 of file cons_setppc.c.
Referenced by consdataEnsureVarsSize(), and createConsSetppc().
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static |
creates a transformed set partitioning / packing / covering constraint data object
| scip | SCIP data structure |
| consdata | pointer to store the set partitioning / packing / covering constraint |
| nvars | number of variables in the constraint |
| vars | variables of the constraint |
| setppctype | type of constraint: set partitioning, packing, or covering constraint |
Definition at line 666 of file cons_setppc.c.
Referenced by createConsSetppc().
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static |
frees a set partitioning / packing / covering constraint data
| scip | SCIP data structure |
| consdata | pointer to store the set partitioning / packing / covering constraint |
Definition at line 688 of file cons_setppc.c.
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static |
prints set partitioning / packing / covering constraint to file stream
| scip | SCIP data structure |
| consdata | set partitioning / packing / covering constraint data |
| file | output file (or NULL for standard output) |
Definition at line 719 of file cons_setppc.c.
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static |
returns the bit signature of the given constraint data
| consdata | set partitioning / packing / covering constraint data |
Definition at line 756 of file cons_setppc.c.
References NULL.
Referenced by removeRedundantConstraints().
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static |
sorts setppc constraint's variables by non-decreasing variable index
| consdata | linear constraint data |
Definition at line 777 of file cons_setppc.c.
References SCIPsortPtr(), SCIPvarCompare(), setSetppcType(), and TRUE.
Referenced by removeRedundantConstraints().
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static |
changes the type of a setppc constraint
| scip | SCIP data structure |
| cons | setppc constraint |
| setppctype | new type of constraint |
Definition at line 809 of file cons_setppc.c.
Referenced by consdataSort(), detectRedundantConstraints(), processContainedCons(), removeDoubleAndSingletonsAndPerformDualpresolve(), and removeRedundantConstraints().
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static |
catches events for variable at given position
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint |
| eventhdlr | event handler to call for the event processing |
| pos | array position of variable to catch bound change events for |
Definition at line 880 of file cons_setppc.c.
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static |
drops events for variable at given position
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint |
| eventhdlr | event handler to call for the event processing |
| pos | array position of variable to catch bound change events for |
Definition at line 950 of file cons_setppc.c.
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static |
catches bound change events for all variables in transformed setppc constraint
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint |
| eventhdlr | event handler to call for the event processing |
Definition at line 986 of file cons_setppc.c.
Referenced by createConsSetppc().
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drops bound change events for all variables in transformed setppc constraint
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint |
| eventhdlr | event handler to call for the event processing |
Definition at line 1009 of file cons_setppc.c.
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static |
adds coefficient in setppc constraint
| scip | SCIP data structure |
| cons | setppc constraint |
| var | variable to add to the constraint |
Definition at line 1032 of file cons_setppc.c.
Referenced by addExtraCliques(), applyFixings(), checkForOverlapping(), liftCliqueVariables(), and SCIPaddCoefSetppc().
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deletes coefficient at given position from setppc constraint data
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint |
| pos | position of coefficient to delete |
Definition at line 1113 of file cons_setppc.c.
Referenced by applyFixings(), checkForOverlapping(), mergeMultiples(), and removeDoubleAndSingletonsAndPerformDualpresolve().
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in case a part (more than one variable) in the setppc constraint is independent of every else (is locked only by this constraint), we can perform dual reductions;
(1) set covering
- fix all independant variables with negative object coefficient to one
- fix all remaining independant variables to zero
(i) all variables are independent and the constraint is not modifiable
- fix the variable with the smallest object coefficient to one
(ii) a variable x has exactly 0 uplocks and arbitrary downlocks and a variable y has exactly 1 downlock and arbitrary uplocks and obj(x) <= obj(y) and obj(y) >= 0
(2) set partitioning
(i) all variables are independent and the constraint is not modifiable
- fix the variable with the smallest object coefficient to one
- fix all remaining independant variables to zero
(ii) a variable x has exactly 1 uplock and arbitrary downlocks and a variable y has exactly 1 downlock and arbitrary uplocks and obj(x) <= obj(y)
(3) set packing
(i) all variables are independent and the constraint is not modifiable
- fix the variable with the smallest object coefficient to one if the object coefficient is negative or zero
- fix all remaining independant variables to zero
(ii) a variable x has exactly 1 uplock and arbitrary downlocks and a variable y has exactly 0 downlocks and arbitrary uplocks and obj(x) <= obj(y)
Note: the following dual reduction for set covering and set packing constraints is already performed by the presolver "dualfix" (1) in case of a set covering constraint the following dual reduction can be performed:
Note: all dual reduction (ii) could also be performed by the "domcol" presolver, but cause the pairwise comparison of columns is only done heuristically (and here it should be even cheaper) we perform them here (too)
| scip | SCIP data structure |
| cons | setppc constraint |
| nfixedvars | pointer to count number of fixings |
| ndelconss | pointer to count number of deleted constraints |
| result | pointer to store the result SCIP_SUCCESS, if presolving was performed |
Definition at line 1236 of file cons_setppc.c.
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find pairs of negated variables in constraint: partitioning/packing: all other variables must be zero, constraint is redundant covering: constraint is redundant
find sets of equal variables in constraint: partitioning/packing: variable must be zero covering: multiple entries of variable can be replaced by single entry
| scip | SCIP data structure |
| cons | knapsack constraint |
| nfixedvars | pointer to store number of fixed variables |
| ndelconss | pointer to store number of deleted constraints |
| nchgcoefs | pointer to store number of changed coefficients |
| cutoff | pointer to store whether a fixing leads to a cutoff |
Definition at line 1527 of file cons_setppc.c.
References applyFixings(), delCoefPos(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIP_VARSTATUS_FIXED, SCIP_VARSTATUS_NEGATED, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsDeleted(), SCIPdebugMsg, SCIPdelCons(), SCIPfixVar(), SCIPsortPtr(), SCIPvarGetName(), SCIPvarGetNegatedVar(), SCIPvarGetStatus(), SCIPvarIsActive(), SCIPvarIsBinary(), and TRUE.
Referenced by addExtraCliques(), collectCliqueConss(), and removeDoubleAndSingletonsAndPerformDualpresolve().
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deletes all zero-fixed variables and replace aggregated variables
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint |
| 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 |
| nfixedvars | pointer to store number of fixed variables, or NULL indicating we can not resolve multi-aggregations |
| cutoff | pointer to store whether a fixing leads to a cutoff, or NULL indicating we can not resolve multi-aggregations |
Definition at line 1671 of file cons_setppc.c.
References addCoef(), analyzeConflictZero(), delCoefPos(), FALSE, MAX, NULL, SCIP_Bool, SCIP_CALL, SCIP_ERROR, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIP_VARSTATUS_MULTAGGR, SCIP_VARSTATUS_NEGATED, SCIPaddCons(), SCIPallocBufferArray, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsAdded(), SCIPconsIsChecked(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsLinear(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPdelCons(), SCIPerrorMessage, SCIPfixVar(), SCIPfreeBufferArray, SCIPgetBinvarRepresentative(), SCIPgetProbvarLinearSum(), SCIPinfinity(), SCIPisEQ(), SCIPisFeasEQ(), SCIPisZero(), SCIPreallocBufferArray, SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetNegatedVar(), SCIPvarGetNegationVar(), SCIPvarGetProbvar(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarIsActive(), SCIPvarIsBinary(), SCIPwarningMessage(), and TRUE.
Referenced by addCliques(), collectCliqueConss(), mergeMultiples(), removeDoubleAndSingletonsAndPerformDualpresolve(), and SCIP_DECL_CONSEXITPRE().
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analyzes conflicting assignment on given constraint where all of the variables where assigned to zero, and adds conflict constraint to problem
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint that detected the conflict |
Definition at line 1984 of file cons_setppc.c.
Referenced by applyFixings(), and processFixings().
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analyzes conflicting assignment on given constraint where two of the variables where assigned to one, and adds conflict constraint to problem
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint that detected the conflict |
Definition at line 2019 of file cons_setppc.c.
Referenced by processFixings().
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checks constraint for violation only looking at the fixed variables, applies further fixings if possible
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint to be processed |
| cutoff | pointer to store TRUE, if the node can be cut off |
| nfixedvars | pointer to count number of deleted variables |
| 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 2059 of file cons_setppc.c.
References analyzeConflictOne(), analyzeConflictZero(), checkCons(), CONSHDLR_NAME, FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetName(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPdelConsLocal(), SCIPinferBinvarCons(), SCIPisFeasEQ(), SCIPisFeasZero(), SCIPresetConsAge(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetUbLocal(), and TRUE.
Referenced by collectCliqueConss(), enforcePseudo(), removeDoubleAndSingletonsAndPerformDualpresolve(), and separateCons().
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checks constraint for violation, returns TRUE iff constraint is feasible
| scip | SCIP data structure |
| consdata | set partitioning / packing / covering constraint to be checked |
| sol | primal CIP solution |
Definition at line 2295 of file cons_setppc.c.
References createRow(), FALSE, SCIP_Real, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIPABORT, SCIPerrorMessage, SCIPgetSolVal(), SCIPisFeasEQ(), SCIPisFeasGE(), SCIPisFeasLE(), and SCIPvarIsBinary().
Referenced by enforcePseudo(), processFixings(), and separateCons().
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creates an LP row in a set partitioning / packing / covering constraint data object
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint |
Definition at line 2340 of file cons_setppc.c.
Referenced by checkCons().
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adds setppc constraint as cut to the LP
| scip | SCIP data structure |
| cons | setppc constraint |
| sol | primal CIP solution, NULL for current LP solution |
| cutoff | whether a cutoff has been detected |
Definition at line 2382 of file cons_setppc.c.
Referenced by separateCons().
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checks constraint for violation, and adds it as a cut if possible
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint to be separated |
| sol | primal CIP solution, NULL for current LP solution |
| lpfeas | is the given solution feasible for the current LP ? |
| 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 2416 of file cons_setppc.c.
References addCut(), checkCons(), CONSHDLR_NAME, enforcePseudo(), FALSE, NULL, processFixings(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetName(), SCIPdebugMsg, SCIPgetRowSolFeasibility(), SCIPincConsAge(), SCIPisFeasNegative(), SCIPresetConsAge(), SCIProwIsInLP(), and TRUE.
Referenced by enforceConstraint().
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static |
enforces the pseudo solution on the given constraint
| scip | SCIP data structure |
| cons | set partitioning / packing / covering constraint to be separated |
| 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 2502 of file cons_setppc.c.
References checkCons(), CONSHDLR_NAME, NULL, processFixings(), SCIP_Bool, SCIP_CALL, SCIP_DECL_HASHGETKEY(), SCIP_OKAY, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPhasCurrentNodeLP(), SCIPincConsAge(), SCIPresetConsAge(), and TRUE.
Referenced by separateCons().
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gets the key of the given element
Definition at line 2563 of file cons_setppc.c.
References SCIP_Bool.
Referenced by enforcePseudo().
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returns TRUE iff both keys are equal; two constraints are equal if they have the same variables
Definition at line 2571 of file cons_setppc.c.
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static |
returns the hash value of the key
Definition at line 2614 of file cons_setppc.c.
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add extra clique-constraints resulting from a given cliquepartition to SCIP
| scip | SCIP data structure |
| binvars | binary variables to create clique constraints |
| nbinvars | number of binary variables to create clique constraints |
| cliquepartition | clique partition of binary variables |
| ncliques | number of cliques in cliquepartition |
| usefulconss | storage for created constraints |
| nusefulconss | pointer to store number of useful created constraints |
| nrounds | actual presolving round |
| nfixedvars | pointer to count number of deleted variables |
| naddconss | pointer to count number of added constraints |
| ndelconss | pointer to count number of deleted constraints |
| nchgcoefs | pointer to count number of deleted coefficients |
| cutoff | pointer to store if the problem is infeasible due to a fixing |
Definition at line 2645 of file cons_setppc.c.
References addCoef(), collectCliqueConss(), FALSE, mergeMultiples(), NULL, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIPaddCons(), SCIPconsGetData(), SCIPconsIsDeleted(), SCIPcreateConsSetpack(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPreleaseCons(), SCIPsnprintf(), and TRUE.
Referenced by preprocessCliques().
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start to collect setpartitioning and setpacking constraints, and try to remove fixed variables and merged these constraints
| scip | SCIP data structure |
| conss | constraint set |
| nconss | number of constraints in constraint set |
| usefulconss | storage for created constraints |
| nusefulconss | pointer to store number of useful created constraints |
| nfixedvars | pointer to count number of deleted variables |
| ndelconss | pointer to count number of deleted constraints |
| nchgcoefs | pointer to count number of deleted coefficients |
| cutoff | pointer to store if the problem is infeasible due to a fixing |
Definition at line 2765 of file cons_setppc.c.
References applyFixings(), collectCliqueData(), mergeMultiples(), NULL, processFixings(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsDeleted(), and SCIPconsIsModifiable().
Referenced by addExtraCliques(), and preprocessCliques().
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creating all necessary data in array structure, collect all clique constraint variables and occurances,
| scip | SCIP data structure |
| usefulconss | clique constraints |
| nusefulconss | number of clique constraints |
| usefulvars | storage for all found variables |
| nusefulvars | pointer to store number of added variables |
| vartoindex | hashmap mapping variables to indices |
| varnconss | storage for remembering the number of constraints a variable occurs |
| maxnvarconsidx | storage for the maximal number of occurances of a variable |
| varconsidxs | storage for constraint indices in which the corresponding variable exists |
| maxnvars | pointer to store maximal number of variables of a constraint |
Definition at line 2857 of file cons_setppc.c.
References deleteCliqueDataEntry(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIPallocBufferArray, SCIPcalcMemGrowSize(), SCIPconsGetData(), SCIPconsIsActive(), SCIPhashmapExists(), SCIPhashmapGetImage(), SCIPhashmapInsert(), SCIPreallocBufferArray, SCIPvarGetLbLocal(), SCIPvarGetNegatedVar(), SCIPvarGetNegationVar(), SCIPvarGetNLocksDown(), SCIPvarGetNLocksUp(), SCIPvarGetUbLocal(), SCIPvarIsActive(), and SCIPvarIsNegated().
Referenced by collectCliqueConss(), and preprocessCliques().
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correct clique data due to an aggregation
| var | variable which appears less |
| considx | constraint index which to remove |
| vartoindex | hashmap mapping variables to indices |
| varnconss | storage for remembering the number of constraints a variable occurs |
| varconsidxs | storage for constraint indices in which the corresponding variable exists |
Definition at line 2964 of file cons_setppc.c.
Referenced by checkForOverlapping(), and collectCliqueData().
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static |
| scip | SCIP data structure |
| addvar | variable which was added |
| considx | constraint index which to add |
| maybenew | could be a new variables, a negated of an already existing |
| usefulvars | storage for all found variables |
| nusefulvars | pointer to store number of added variables |
| vartoindex | hashmap mapping variables to indices |
| varnconss | storage for remembering the number of constraints a variable occurs |
| maxnvarconsidx | storage for the maximal number of occurances of a variable |
| varconsidxs | storage for constraint indices in which the corresponding variable exists |
Definition at line 3006 of file cons_setppc.c.
References NULL, presolvePropagateCons(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPallocBufferArray, SCIPcalcMemGrowSize(), SCIPhashmapExists(), SCIPhashmapGetImage(), SCIPhashmapInsert(), SCIPreallocBufferArray, SCIPsortedvecInsertDownPtr(), SCIPvarGetLbLocal(), SCIPvarGetNegatedVar(), SCIPvarGetUbLocal(), SCIPvarIsActive(), and SCIPvarIsNegated().
Referenced by checkForOverlapping(), and liftCliqueVariables().
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check if constraint is already redundant or infeasible due to fixings, fix or aggregate left over variables if possible
| scip | SCIP data structure |
| cons | constraint |
| aggregate | try to aggregate if possible |
| undoneaggrvars | array to store aggregation variables, if aggregation is not performed yet; both variables are standing next to each other; or NULL if aggregate == TRUE |
| undoneaggrtypes | array to store aggregation type, if aggregation is not performed yet; type FALSE means the aggregation is of the form x + y = 1; type TRUE means the aggregation is of the form x = y; or NULL if aggregate == TRUE |
| naggregations | pointer to store number of aggregations which are not yet performed; or NULL if aggregate == TRUE |
| saggregations | pointer to store size of the array for aggregation type and two times the value is the size of the array for the aggregation variables which are not yet performed; or NULL if aggregate == TRUE |
| nfixedvars | pointer to count number of deleted variables |
| naggrvars | pointer to count number of aggregated variables |
| ndelconss | pointer to count number of deleted constraints |
| cutoff | pointer to store if the problem is infeasible due to a fixing |
Definition at line 3075 of file cons_setppc.c.
References BMSclearMemoryArray, checkForOverlapping(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIPaggregateVars(), SCIPcalcMemGrowSize(), SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPconsIsActive(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPdelCons(), SCIPdoNotAggr(), SCIPfixVar(), SCIPreallocBufferArray, SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetUbLocal(), and TRUE.
Referenced by addCliqueDataEntry(), checkForOverlapping(), and preprocessCliques().
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check for overlapping constraint
| scip | SCIP data structure |
| cons | constraint which may overlap |
| considx | constriant index to avoid checking against itself |
| endidx | end index to check against given constraint |
| usefulconss | clique constraints |
| nusefulconss | number of clique constraints |
| usefulvars | storage for all found variables |
| nusefulvars | pointer to store number of added variables |
| vartoindex | hashmap mapping variables to indices |
| varnconss | storage for remembering the number of constraints a variable occurs |
| maxnvarconsidx | storage for the maximal number of occurances of a variable |
| varconsidxs | storage for constraint indices in which the corresponding variable exists |
| countofoverlapping | the amount of variables of cons which overlap in all other constraint |
| shrinking | try to replace some variables with one variable |
| chgcons | pointer to store if the given constraint was changed, due to added/deleted variables |
| undoneaggrvars | array to store aggregation variables, if aggregation is not performed yet; both variables are standing next to each other; |
| undoneaggrtypes | array to store aggregation type, if aggregation is not performed yet; type FALSE means the aggregation is of the form x + y = 1; type TRUE means the aggregation is of the form x = y; |
| naggregations | pointer to store number of aggregations which are not yet performed; |
| saggregations | pointer to store size of the array for aggregation type and two times the value is the size of the array for the aggregation variables which are not yet performed; |
| nfixedvars | pointer to count number of deleted variables |
| naggrvars | pointer to count number of aggregated variables |
| nchgcoefs | pointer to count number of changed coefficients |
| ndelconss | pointer to count number of deleted constraints |
| cutoff | pointer to store if the problem is infeasible due to a fixing |
Definition at line 3418 of file cons_setppc.c.
References addCliqueDataEntry(), addCoef(), BMSclearMemoryArray, delCoefPos(), deleteCliqueDataEntry(), FALSE, liftCliqueVariables(), NULL, presolvePropagateCons(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIP_VARSTATUS_NEGATED, SCIPcalcMemGrowSize(), SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsActive(), SCIPdebugMsg, SCIPdelCons(), SCIPdoNotAggr(), SCIPfixVar(), SCIPgetNegatedVar(), SCIPreallocBufferArray, SCIPsortDownPtr(), SCIPupdateConsFlags(), SCIPvarGetIndex(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetNegationVar(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), SCIPvarIsActive(), and TRUE.
Referenced by preprocessCliques(), and presolvePropagateCons().
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try to lift variables to given constraint
| scip | SCIP data structure |
| cons | constraint which may overlap |
| arraypos | position of constraint in global array |
| usefulvars | possible variables to lift |
| nusefulvars | pointer to store number of added variables |
| endidx | end index for possible lifting variables |
| cliquevalues | pointer to clique values of constraint-variables, either one if the varibale is active or zero if the variable is negated |
| vartoindex | hashmap mapping variables to indices |
| varnconss | array with number of constraints a variable occurs |
| maxnvarconsidx | array with the maximal number of occurances of a variable |
| varconsidxs | array with constraint indices in which the corresponding variable exists |
| maxnvars | pointer to store maximal number of variables of a constraint |
| nadded | pointer to store number of possible added variables |
| chgcons | pointer to store if the constraint was changed, due to added variables |
| nfixedvars | pointer to count number of deleted variables |
| ndelconss | pointer to count number of deleted constraints |
| cutoff | pointer to store if the problem is infeasible due to a fixing |
Definition at line 4284 of file cons_setppc.c.
References addCliqueDataEntry(), addCoef(), FALSE, NULL, performAggregations(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_PARTITIONING, SCIP_VARSTATUS_NEGATED, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsActive(), SCIPdebugMsg, SCIPdelCons(), SCIPfixVar(), SCIPhashmapExists(), SCIPhaveVarsCommonClique(), SCIPreallocBufferArray, SCIPvarCompareActiveAndNegated(), SCIPvarGetIndex(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetNegationVar(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), SCIPvarIsActive(), SCIPvarsHaveCommonClique(), and TRUE.
Referenced by checkForOverlapping(), and preprocessCliques().
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perform all collected aggregations
| scip | SCIP data structure |
| conshdlrdata | constraint handler data |
| undoneaggrvars | aggregation variables storage |
| undoneaggrtypes | aggregation type storage, type FALSE means the aggregation is of the form x + y = 1; type TRUE means the aggregation is of the form x = y; |
| naggregations | number of aggregations to performed |
| naggrvars | pointer to count number of aggregated variables |
| cutoff | pointer to store if the problem is infeasible due to a fixing |
Definition at line 4758 of file cons_setppc.c.
References NULL, preprocessCliques(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPaggregateVars(), SCIPdebugMsg, and SCIPvarGetName().
Referenced by liftCliqueVariables(), and preprocessCliques().
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check whether we can combine or grow cliques so some constraints become redundant or we can fix variables
| scip | SCIP data structure |
| conshdlrdata | constraint handler data |
| conss | constraint set |
| nconss | number of constraints in constraint set |
| nrounds | actual presolving round |
| firstchange | pointer to store first changed constraint |
| firstclique | pointer to store first constraint to start adding clique again |
| lastclique | pointer to store last constraint to add cliques again |
| nfixedvars | pointer to count number of deleted variables |
| naggrvars | pointer to count number of aggregated variables |
| ndelconss | pointer to count number of deleted constraints |
| nchgcoefs | pointer to count number of deleted coefficients |
| cutoff | pointer to store if the problem is infeasible due to a fixing |
Definition at line 4839 of file cons_setppc.c.
References addCliques(), addExtraCliques(), BMSclearMemoryArray, checkForOverlapping(), collectCliqueConss(), collectCliqueData(), FALSE, liftCliqueVariables(), MAX, MIN, NULL, performAggregations(), presolvePropagateCons(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_PARTITIONING, SCIP_VARSTATUS_NEGATED, SCIPallocBufferArray, SCIPblkmem(), SCIPcalcCliquePartition(), SCIPconsGetData(), SCIPconsIsActive(), SCIPdoNotAggr(), SCIPduplicateBufferArray, SCIPfreeBufferArray, SCIPfreeBufferArrayNull, SCIPgetNBinVars(), SCIPgetNVars(), SCIPgetVars(), SCIPhashmapCreate(), SCIPhashmapExists(), SCIPhashmapFree(), SCIPhashmapGetImage(), SCIPisStopped(), SCIPrandomPermuteArray(), SCIPreallocBufferArray, SCIPsortDownPtr(), SCIPsortedvecFindDownPtr(), SCIPvarGetLbLocal(), SCIPvarGetNegatedVar(), SCIPvarGetNegationVar(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), SCIPvarIsActive(), SCIPvarIsNegated(), and TRUE.
Referenced by performAggregations().
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add cliques to SCIP
| scip | SCIP data structure |
| conss | constraint set |
| nconss | number of constraints in constraint set |
| firstclique | first constraint to start to add cliques |
| lastclique | last constraint to start to add cliques |
| naddconss | pointer to count number of added constraints |
| ndelconss | pointer to count number of deleted constraints |
| nchgbds | pointer to count number of chnaged bounds |
| cutoff | pointer to store if the problem is infeasible due to a fixing |
Definition at line 5283 of file cons_setppc.c.
References applyFixings(), FALSE, multiAggregateBinvar(), NULL, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIPaddClique(), SCIPaddVarImplication(), SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsDeleted(), SCIPconsIsModifiable(), and TRUE.
Referenced by preprocessCliques().
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static |
perform multi-aggregation on variables resulting from a set-partitioning/-packing constraint
| scip | SCIP data structure |
| linearconshdlrexist | does the linear constraint handler exist, necessaray for multi-aggregations |
| vars | all variables including the variable to which will be multi-aggregated |
| nvars | number of all variables |
| pos | position of variable for multi-aggregation |
| infeasible | pointer to store infeasibility status of aggregation |
| aggregated | pointer to store aggregation status |
Definition at line 5366 of file cons_setppc.c.
References NULL, removeDoubleAndSingletonsAndPerformDualpresolve(), scalars, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaggregateVars(), SCIPallocBufferArray, SCIPdebugMsg, SCIPduplicateBufferArray, SCIPfreeBufferArray, SCIPmultiaggregateVar(), SCIPvarGetName(), SCIPvarGetNLocksDown(), and SCIPvarGetNLocksUp().
Referenced by addCliques(), and removeDoubleAndSingletonsAndPerformDualpresolve().
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static |
determine singleton variables in set-partitioning/-packing constraints, or doubleton variables (active and negated) in any combination of set-partitioning and set-packing constraints
we can multi-aggregate the variable and either change the set-partitioning constraint to a set-packing constraint or even delete it
we can also aggregate a variable in a set-packing constraint with only two variables when the uplocks are equal to one and then delete this constraint
x + y + z = 1 ~x + u + v <=/= 1 ~x + w <= 1
| scip | SCIP data structure |
| conss | constraint set |
| nconss | number of constraints in constraint set |
| dualpresolvingenabled | is dual presolving enabled |
| linearconshdlrexist | does the linear constraint handler exist, necessaray for multi-aggregations |
| nfixedvars | pointer to count number of deleted variables |
| naggrvars | pointer to count number of aggregated variables |
| ndelconss | pointer to count number of deleted constraints |
| nchgcoefs | pointer to count number of changed coefficients |
| nchgsides | pointer to count number of changed left hand sides |
| cutoff | pointer to store if a cut off was detedcted |
Definition at line 5465 of file cons_setppc.c.
References applyFixings(), BMSclearMemoryArray, delCoefPos(), detectRedundantConstraints(), FALSE, mergeMultiples(), multiAggregateBinvar(), NULL, processFixings(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIP_VARSTATUS_NEGATED, SCIP_VARTYPE_CONTINUOUS, SCIPaggregateVars(), SCIPallocBufferArray, SCIPblkmem(), SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPdelCons(), SCIPdoNotAggr(), SCIPdoNotMultaggr(), SCIPduplicateBufferArray, SCIPfixVar(), SCIPfreeBufferArray, SCIPgetNBinVars(), SCIPgetNContVars(), SCIPgetNImplVars(), SCIPgetNIntVars(), SCIPgetNVars(), SCIPgetVars(), SCIPhashmapCreate(), SCIPhashmapExists(), SCIPhashmapFree(), SCIPhashmapGetImage(), SCIPhashmapInsert(), SCIPhashmapRemove(), SCIPisNegative(), SCIPsortPtr(), SCIPvarGetAggregatedObj(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetNegatedVar(), SCIPvarGetNLocksDown(), SCIPvarGetNLocksUp(), SCIPvarGetObj(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarIsBinary(), setSetppcType(), and TRUE.
Referenced by multiAggregateBinvar().
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compares each constraint with all other constraints for possible redundancy and removes or changes constraint accordingly; in contrast to removeRedundantConstraints(), it uses a hash table
| 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 |
| nchgsides | pointer to count number of changed left/right hand sides |
Definition at line 6218 of file cons_setppc.c.
References HASHSIZE_SETPPCCONS, MAX, NULL, removeRedundantCons(), SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_PARTITIONING, SCIPconsGetData(), SCIPconsGetName(), SCIPconsGetPos(), SCIPconsIsActive(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPdelCons(), SCIPhashtableCreate(), SCIPhashtableFree(), SCIPhashtableInsert(), SCIPhashtableRetrieve(), SCIPupdateConsFlags(), and setSetppcType().
Referenced by removeDoubleAndSingletonsAndPerformDualpresolve().
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removes the redundant second constraint and updates the flags of the first one
| 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 6326 of file cons_setppc.c.
Referenced by detectRedundantConstraints(), processContainedCons(), and removeRedundantConstraints().
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for cons0 contained in cons1, fixes variables of cons1 that are not in cons0 to zero
| scip | SCIP data structure |
| cons0 | constraint that is contained in the other |
| cons1 | constraint that is a superset of the other |
| cutoff | pointer to store whether a cutoff was found |
| nfixedvars | pointer to count number of fixed variables |
Definition at line 6352 of file cons_setppc.c.
Referenced by processContainedCons().
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applies reductions for cons0 being contained in cons1
| scip | SCIP data structure |
| cons0 | constraint that is contained in the other |
| cons1 | constraint that is a superset of the other |
| cutoff | pointer to store whether a cutoff was found |
| nfixedvars | pointer to count number of fixed variables |
| ndelconss | pointer to count number of deleted constraints |
| nchgsides | pointer to count number of changed left/right hand sides |
Definition at line 6424 of file cons_setppc.c.
References FALSE, fixAdditionalVars(), NULL, removeRedundantCons(), removeRedundantConstraints(), SCIP_Bool, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIPconsGetData(), SCIPconsGetName(), SCIPerrorMessage, and setSetppcType().
Referenced by removeRedundantConstraints().
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deletes redundant constraints
| scip | SCIP data structure |
| conss | constraint set |
| firstchange | first constraint that changed since last pair preprocessing round |
| chkind | index of constraint to check against all prior indices upto startind |
| cutoff | pointer to store whether a cutoff was found |
| nfixedvars | pointer to count number of fixed variables |
| ndelconss | pointer to count number of deleted constraints |
| nchgsides | pointer to count number of changed left/right hand sides |
Definition at line 6540 of file cons_setppc.c.
References consdataGetSignature(), consdataSort(), FALSE, NULL, performVarDeletions(), processContainedCons(), removeRedundantCons(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsActive(), SCIPconsIsModifiable(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPvarGetIndex(), and setSetppcType().
Referenced by processContainedCons().
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| scip | SCIP data structure |
| conshdlr | constraint handler |
| conss | array of constraints |
| nconss | number of constraints |
Definition at line 6712 of file cons_setppc.c.
Referenced by removeRedundantConstraints().
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helper function to enforce constraints
| 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 6755 of file cons_setppc.c.
References CONSHDLR_NAME, createConsSetppc(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_CUTOFF, SCIP_FEASIBLE, SCIP_OKAY, SCIP_REDUCEDDOM, SCIP_SEPARATED, SCIPconshdlrGetName(), SCIPdebugMsg, separateCons(), and TRUE.
Referenced by SCIP_DECL_CONSENFOLP().
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creates and captures a set partitioning / packing / covering constraint
| 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 |
| setppctype | type of constraint: set partitioning, packing, or covering constraint |
| 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 6827 of file cons_setppc.c.
References catchAllEvents(), consdataCreate(), consdataCreateTransformed(), CONSHDLR_NAME, createNormalizedSetppc(), NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIP_Real, SCIP_SETPPCTYPE_PARTITIONING, SCIP_STAGE_PROBLEM, SCIPconshdlrGetData(), SCIPcreateCons(), SCIPerrorMessage, SCIPfindConshdlr(), SCIPgetStage(), and SCIPisTransformed().
Referenced by createNormalizedSetppc(), enforceConstraint(), SCIPcreateConsSetcover(), SCIPcreateConsSetpack(), and SCIPcreateConsSetpart().
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creates and captures a normalized (with all coefficients +1) setppc constraint
| 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) |
| setppctype | type of constraint: set partitioning, packing, or covering constraint |
| 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 6912 of file cons_setppc.c.
References createConsSetppc(), NULL, SCIP_CALL, SCIP_DECL_LINCONSUPGD(), SCIP_OKAY, SCIPallocBufferArray, SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPfreeBufferArray, and SCIPgetNegatedVar().
Referenced by createConsSetppc(), and SCIP_DECL_LINCONSUPGD().
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check, if linear constraint can be upgraded to set partitioning, packing, or covering constraint
Definition at line 6980 of file cons_setppc.c.
References createNormalizedSetppc(), SCIP_CALL, SCIP_DECL_QUADCONSUPGD(), SCIP_OKAY, SCIP_Real, SCIP_SETPPCTYPE_COVERING, SCIP_SETPPCTYPE_PACKING, SCIP_SETPPCTYPE_PARTITIONING, SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPdebugMsg, SCIPisEQ(), and SCIPisInfinity().
Referenced by createNormalizedSetppc().
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tries to upgrade a quadratic constraint to a setpacking constraint
Definition at line 7061 of file cons_setppc.c.
Referenced by SCIP_DECL_LINCONSUPGD().
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copy method for constraint handler plugins (called when SCIP copies plugins)
Definition at line 7176 of file cons_setppc.c.
References CONSHDLR_NAME, NULL, and SCIPconshdlrGetName().
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destructor of constraint handler to free constraint handler data (called when SCIP is exiting)
Definition at line 7192 of file cons_setppc.c.
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initialization method of constraint handler (called after problem was transformed)
Definition at line 7213 of file cons_setppc.c.
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presolving deinitialization method of constraint handler (called after presolving has been finished)
Definition at line 7239 of file cons_setppc.c.
References applyFixings(), NULL, SCIP_CALL, SCIP_DECL_CONSEXITSOL(), SCIP_OKAY, and SCIPconsIsDeleted().
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solving process deinitialization method of constraint handler (called before branch and bound process data is freed)
Definition at line 7260 of file cons_setppc.c.
Referenced by SCIP_DECL_CONSEXITPRE().
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frees specific constraint data
Definition at line 7283 of file cons_setppc.c.
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transforms constraint data into data belonging to the transformed problem
Definition at line 7319 of file cons_setppc.c.
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LP initialization method of constraint handler (called before the initial LP relaxation at a node is solved)
Definition at line 7368 of file cons_setppc.c.
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separation method of constraint handler for LP solutions
Definition at line 7386 of file cons_setppc.c.
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separation method of constraint handler for arbitrary primal solutions
Definition at line 7429 of file cons_setppc.c.
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constraint enforcing method of constraint handler for LP solutions
Definition at line 7781 of file cons_setppc.c.
References enforceConstraint(), SCIP_CALL, and SCIP_OKAY.
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constraint enforcing method of constraint handler for relaxation solutions
Definition at line 7791 of file cons_setppc.c.
References SCIP_Bool.
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constraint enforcing method of constraint handler for pseudo solutions
Definition at line 7801 of file cons_setppc.c.
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feasibility check method of constraint handler for integral solutions
Definition at line 7863 of file cons_setppc.c.
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domain propagation method of constraint handler
Definition at line 7914 of file cons_setppc.c.
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presolving method of constraint handler
Definition at line 7978 of file cons_setppc.c.
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propagation conflict resolving method of constraint handler
Definition at line 8260 of file cons_setppc.c.
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variable rounding lock method of constraint handler
Definition at line 8342 of file cons_setppc.c.
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constraint activation notification method of constraint handler
Definition at line 8382 of file cons_setppc.c.
References CONSHDLR_NAME, NULL, SCIP_CALL, SCIP_DECL_CONSDEACTIVE, SCIP_DECL_CONSDELVARS(), SCIP_OKAY, SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPconshdlrGetName(), SCIPconsIsTransformed(), SCIPdebugMsg, and SCIPmarkConsPropagate().
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constraint deactivation notification method of constraint handler variable deletion method of constraint handler
Definition at line 8432 of file cons_setppc.c.
Referenced by SCIP_DECL_CONSACTIVE().
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constraint display method of constraint handler
Definition at line 8450 of file cons_setppc.c.
References SCIP_Real.
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constraint copying method of constraint handler
Definition at line 8464 of file cons_setppc.c.
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constraint parsing method of constraint handler
Definition at line 8515 of file cons_setppc.c.
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constraint method of constraint handler which returns the variables (if possible)
Definition at line 8609 of file cons_setppc.c.
References BMScopyMemoryArray, NULL, SCIP_DECL_CONSGETNVARS(), SCIP_OKAY, SCIPconsGetData(), and TRUE.
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constraint method of constraint handler which returns the number of variables (if possible)
Definition at line 8631 of file cons_setppc.c.
References NULL.
Referenced by SCIP_DECL_CONSGETVARS().
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Definition at line 8649 of file cons_setppc.c.
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Definition at line 8744 of file cons_setppc.c.