benderscut_nogood.c
Go to the documentation of this file.
22 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
64 SCIP_Bool cutadded; /**< has a cut been added in the current iteration. Only one cut per round */
116 /* if the variable is on its upper bound, then the subproblem objective value is added to the cut */
189 /* if the cuts are generated prior to the solving stage, then rows can not be generated. So constraints must be
201 (void) SCIPsnprintf(cutname, SCIP_MAXSTRLEN, "nogoodcut_%" SCIP_LONGINT_FORMAT, SCIPbenderscutGetNFound(benderscut) );
206 SCIP_CALL( SCIPcreateEmptyRowConshdlr(masterprob, &row, consbenders, cutname, 0.0, SCIPinfinity(masterprob), FALSE,
211 SCIP_CALL( SCIPcreateConsBasicLinear(masterprob, &cons, cutname, 0, NULL, NULL, 0.0, SCIPinfinity(masterprob)) );
266 /** destructor of Benders' decomposition cuts to free user data (called when SCIP is exiting) */
303 SCIPdebugMsg(scip, "The subproblem %d is set to NULL. The <%s> Benders' decomposition cut can not be executed.\n",
313 /* if the curriter is less than the number of Benders' decomposition calls, then we are in a new round.
331 SCIPinfoMessage(scip, NULL, "The no-good cuts can only be applied to problems with a pure binary master problem. "
339 /* We can not rely on complete recourse for the subproblems. As such, the subproblems may be feasible for the LP, but
340 * infeasible for the IP. As such, if one subproblem is infeasible, then a no good cut is generated.
377 SCIP_CALL( SCIPincludeBenderscutBasic(scip, benders, &benderscut, BENDERSCUT_NAME, BENDERSCUT_DESC,
389 "should cuts be generated and added to the cutpool instead of global constraints directly added to the problem.",
SCIP_Bool SCIPbendersMasterIsNonlinear(SCIP_BENDERS *benders)
Definition: benders.c:6418
Definition: type_result.h:33
void SCIPbenderscutSetEnabled(SCIP_BENDERSCUT *benderscut, SCIP_Bool enabled)
Definition: benderscut.c:584
SCIP_CONSHDLR * SCIPfindConshdlr(SCIP *scip, const char *name)
Definition: scip_cons.c:877
static SCIP_DECL_BENDERSCUTEXEC(benderscutExecNogood)
Definition: benderscut_nogood.c:289
public methods for SCIP parameter handling
SCIP_Real SCIPgetLhsLinear(SCIP *scip, SCIP_CONS *cons)
Definition: cons_linear.c:18334
Definition: struct_scip.h:59
public methods for memory management
Definition: struct_benderscut.h:37
SCIP_Real SCIPgetSolVal(SCIP *scip, SCIP_SOL *sol, SCIP_VAR *var)
Definition: scip_sol.c:1353
SCIP_RETCODE SCIPprintRow(SCIP *scip, SCIP_ROW *row, FILE *file)
Definition: scip_lp.c:2152
SCIP_RETCODE SCIPaddCoefLinear(SCIP *scip, SCIP_CONS *cons, SCIP_VAR *var, SCIP_Real val)
Definition: cons_linear.c:18089
SCIP_RETCODE SCIPincludeBenderscutNogood(SCIP *scip, SCIP_BENDERS *benders)
Definition: benderscut_nogood.c:357
Definition: struct_var.h:198
Definition: type_benders.h:40
int SCIPbendersGetNSubproblems(SCIP_BENDERS *benders)
Definition: benders.c:5949
SCIP_Longint SCIPbenderscutGetNFound(SCIP_BENDERSCUT *benderscut)
Definition: benderscut.c:534
public methods for Benders' decomposition
SCIP_RETCODE SCIPcreateConsBasicLinear(SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_Real *vals, SCIP_Real lhs, SCIP_Real rhs)
Definition: cons_linear.c:17937
SCIP_RETCODE SCIPchgLhsLinear(SCIP *scip, SCIP_CONS *cons, SCIP_Real lhs)
Definition: cons_linear.c:18382
public methods for problem variables
SCIP_RETCODE SCIPaddBoolParam(SCIP *scip, const char *name, const char *desc, SCIP_Bool *valueptr, SCIP_Bool isadvanced, SCIP_Bool defaultvalue, SCIP_DECL_PARAMCHGD((*paramchgd)), SCIP_PARAMDATA *paramdata)
Definition: scip_param.c:48
Definition: type_result.h:40
Definition: type_benders.h:37
public methods for numerical tolerances
Definition: struct_benders.h:48
Definition: type_benders.h:39
Definition: struct_sol.h:64
SCIP_RETCODE SCIPsetConsRemovable(SCIP *scip, SCIP_CONS *cons, SCIP_Bool removable)
Definition: scip_cons.c:1411
const char * SCIPbenderscutGetName(SCIP_BENDERSCUT *benderscut)
Definition: benderscut.c:483
SCIP * SCIPbendersSubproblem(SCIP_BENDERS *benders, int probnumber)
Definition: benders.c:5959
SCIP_RETCODE SCIPcreateEmptyRowConshdlr(SCIP *scip, SCIP_ROW **row, SCIP_CONSHDLR *conshdlr, const char *name, SCIP_Real lhs, SCIP_Real rhs, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool removable)
Definition: scip_lp.c:1337
public methods for Benders decomposition
Definition: struct_cons.h:37
Definition: struct_cons.h:117
SCIP_Bool SCIPisFeasEQ(SCIP *scip, SCIP_Real val1, SCIP_Real val2)
Definition: scip_numerics.c:773
static SCIP_RETCODE computeNogoodCut(SCIP *masterprob, SCIP_BENDERS *benders, SCIP_SOL *sol, SCIP_CONS *cons, SCIP_ROW *row, SCIP_Bool addcut)
Definition: benderscut_nogood.c:74
void SCIPbenderscutSetData(SCIP_BENDERSCUT *benderscut, SCIP_BENDERSCUTDATA *benderscutdata)
Definition: benderscut.c:404
Definition: type_set.h:43
Definition: type_retcode.h:33
SCIP_RETCODE SCIPincludeBenderscutBasic(SCIP *scip, SCIP_BENDERS *benders, SCIP_BENDERSCUT **benderscutptr, const char *name, const char *desc, int priority, SCIP_Bool islpcut, SCIP_DECL_BENDERSCUTEXEC((*benderscutexec)), SCIP_BENDERSCUTDATA *benderscutdata)
Definition: scip_benders.c:1129
public methods for constraint handler plugins and constraints
public data structures and miscellaneous methods
Definition: struct_lp.h:192
Definition: type_benders.h:38
public methods for LP management
public methods for cuts and aggregation rows
SCIP_Real SCIPgetActivityLinear(SCIP *scip, SCIP_CONS *cons, SCIP_SOL *sol)
Definition: cons_linear.c:18497
Constraint handler for linear constraints in their most general form, .
public methods for the LP relaxation, rows and columns
public methods for Benders' decomposition cuts
SCIP_RETCODE SCIPsetBenderscutFree(SCIP *scip, SCIP_BENDERSCUT *benderscut, SCIP_DECL_BENDERSCUTFREE((*benderscutfree)))
Definition: scip_benders.c:1195
SCIP_RETCODE SCIPaddRow(SCIP *scip, SCIP_ROW *row, SCIP_Bool forcecut, SCIP_Bool *infeasible)
Definition: scip_cut.c:221
general public methods
public methods for solutions
SCIP_RETCODE SCIPchgRowLhs(SCIP *scip, SCIP_ROW *row, SCIP_Real lhs)
Definition: scip_lp.c:1529
SCIP_RETCODE SCIPaddVarToRow(SCIP *scip, SCIP_ROW *row, SCIP_VAR *var, SCIP_Real val)
Definition: scip_lp.c:1641
public methods for message output
Definition: type_result.h:43
public methods for message handling
SCIP_BENDERSCUTDATA * SCIPbenderscutGetData(SCIP_BENDERSCUT *benderscut)
Definition: benderscut.c:394
static SCIP_DECL_BENDERSCUTFREE(benderscutFreeNogood)
Definition: benderscut_nogood.c:268
Generates a no-good cut for solutions that are integer infeasible.
void SCIPinfoMessage(SCIP *scip, FILE *file, const char *formatstr,...)
Definition: scip_message.c:199
SCIP_RETCODE SCIPreleaseCons(SCIP *scip, SCIP_CONS **cons)
Definition: scip_cons.c:1110
SCIP_RETCODE SCIPsetConsDynamic(SCIP *scip, SCIP_CONS *cons, SCIP_Bool dynamic)
Definition: scip_cons.c:1386
Definition: objbenders.h:33
public methods for global and local (sub)problems
static SCIP_RETCODE generateAndApplyBendersNogoodCut(SCIP *masterprob, SCIP_BENDERS *benders, SCIP_BENDERSCUT *benderscut, SCIP_SOL *sol, SCIP_BENDERSENFOTYPE type, SCIP_RESULT *result)
Definition: benderscut_nogood.c:162
Definition: type_stat.h:53
SCIP_Real SCIPgetRowSolActivity(SCIP *scip, SCIP_ROW *row, SCIP_SOL *sol)
Definition: scip_lp.c:2084