SCIP
Solving Constraint Integer Programs
Benders' decomposition
Detailed Description
methods for Benders' decomposition plugins
Function Documentation
◆ SCIP_DECL_SORTPTRCOMP() [1/2]
| SCIP_DECL_SORTPTRCOMP | ( | SCIPbendersComp | ) |
◆ SCIP_DECL_SORTPTRCOMP() [2/2]
| SCIP_DECL_SORTPTRCOMP | ( | SCIPbendersCompName | ) |
comparison method for sorting benderss w.r.t. to their name
comparison method for sorting Benders' decompositions w.r.t. to their name
Definition at line 715 of file benders.c.
References SCIPbendersGetName().
◆ SCIPbendersGetData()
| SCIP_BENDERSDATA* SCIPbendersGetData | ( | SCIP_BENDERS * | benders | ) |
gets user data of Benders' decomposition
- Parameters
-
benders Benders' decomposition
Definition at line 4027 of file benders.c.
References SCIP_Benders::bendersdata, and NULL.
Referenced by createVariableMappings(), SCIP_DECL_BENDERSCOPY(), SCIP_DECL_BENDERSCREATESUB(), SCIP_DECL_BENDERSEXIT(), SCIP_DECL_BENDERSEXITPRE(), SCIP_DECL_BENDERSEXITSOL(), SCIP_DECL_BENDERSFREE(), SCIP_DECL_BENDERSFREESUB(), SCIP_DECL_BENDERSGETVAR(), SCIP_DECL_BENDERSINIT(), SCIP_DECL_BENDERSINITPRE(), SCIP_DECL_BENDERSINITSOL(), SCIP_DECL_BENDERSPOSTSOLVE(), SCIP_DECL_BENDERSPRESUBSOLVE(), SCIP_DECL_BENDERSSOLVESUB(), SCIP_DECL_BENDERSSOLVESUBCONVEX(), SCIPcreateBendersDefault(), SCIPfindObjBenders(), and SCIPgetObjBenders().
◆ SCIPbendersSetData()
| void SCIPbendersSetData | ( | SCIP_BENDERS * | benders, |
| SCIP_BENDERSDATA * | bendersdata | ||
| ) |
sets user data of Benders' decomposition; user has to free old data in advance!
- Parameters
-
benders Benders' decomposition bendersdata new Benders' decomposition user data
Definition at line 4037 of file benders.c.
References SCIP_Benders::bendersdata, and NULL.
Referenced by SCIP_DECL_BENDERSFREE().
◆ SCIPbendersGetName()
| const char* SCIPbendersGetName | ( | SCIP_BENDERS * | benders | ) |
gets name of Benders' decomposition
- Parameters
-
benders Benders' decomposition
Definition at line 4191 of file benders.c.
References SCIP_Benders::name, and NULL.
Referenced by addAuxiliaryVariablesToMaster(), assignAuxiliaryVariables(), createAndAddTransferredCut(), doBenderscutCreate(), SCIP_DECL_DIALOGEXEC(), SCIP_DECL_SORTPTRCOMP(), SCIPbendersCopyInclude(), SCIPbendersExec(), SCIPincludeBenderscutInt(), SCIPincludeBenderscutNogood(), SCIPincludeBenderscutOpt(), SCIPprintBendersStatistics(), SCIPsetBendersSolveAndFreesub(), SCIPsetFindPricer(), and transferBendersCuts().
◆ SCIPbendersGetDesc()
| const char* SCIPbendersGetDesc | ( | SCIP_BENDERS * | benders | ) |
gets description of Benders' decomposition
- Parameters
-
benders Benders' decomposition
Definition at line 4201 of file benders.c.
References SCIP_Benders::desc, and NULL.
Referenced by SCIP_DECL_DIALOGEXEC().
◆ SCIPbendersGetPriority()
| int SCIPbendersGetPriority | ( | SCIP_BENDERS * | benders | ) |
gets priority of Benders' decomposition
- Parameters
-
benders Benders' decomposition
Definition at line 4211 of file benders.c.
References NULL, and SCIP_Benders::priority.
Referenced by SCIP_DECL_DIALOGEXEC().
◆ SCIPbendersGetNSubproblems()
| int SCIPbendersGetNSubproblems | ( | SCIP_BENDERS * | benders | ) |
gets the number of subproblems for the Benders' decomposition
- Parameters
-
benders the Benders' decomposition data structure
Definition at line 4235 of file benders.c.
References SCIP_Benders::nsubproblems, and NULL.
Referenced by addAuxiliaryVariablesToMaster(), assignAuxiliaryVariables(), checkSubproblemIndependence(), constructValidSolution(), createSubproblems(), generateBendersCuts(), initialiseLPSubproblem(), initialiseSubproblem(), numSubproblemsToCheck(), resetSubproblemObjectiveValue(), SCIP_DECL_BENDERSCUTEXEC(), SCIP_DECL_BENDERSCUTINIT(), SCIP_DECL_CONSPRESOL(), SCIP_DECL_DIALOGEXEC(), SCIP_DECL_EVENTEXEC(), SCIPbendersChgMastervarsToCont(), SCIPbendersDeactivate(), SCIPbendersExec(), SCIPbendersExit(), SCIPbendersExitsol(), SCIPbendersGetAuxiliaryVar(), SCIPbendersGetMastervarsCont(), SCIPbendersGetSubproblemLowerbound(), SCIPbendersGetSubproblemObjval(), SCIPbendersSetMastervarsCont(), SCIPbendersSetSubproblemEnabled(), SCIPbendersSetSubproblemIsConvex(), SCIPbendersSetSubproblemIsIndependent(), SCIPbendersSetSubproblemIsSetup(), SCIPbendersSetSubproblemObjval(), SCIPbendersSetupSubproblem(), SCIPbendersSolveSubproblem(), SCIPbendersSubproblemIsConvex(), SCIPbendersSubproblemIsEnabled(), SCIPbendersSubproblemIsIndependent(), SCIPbendersSubproblemIsSetup(), SCIPbendersUpdateSubproblemLowerbound(), SCIPcheckBendersSubproblemOptimality(), SCIPgetBendersAuxiliaryVarVal(), SCIPgetBendersNSubproblems(), solveBendersSubproblems(), updateAuxiliaryVarLowerbound(), and updateSubproblemLowerbound().
◆ SCIPbendersSubproblem()
| SCIP* SCIPbendersSubproblem | ( | SCIP_BENDERS * | benders, |
| int | probnumber | ||
| ) |
returns the SCIP instance for a given subproblem
- Parameters
-
benders the Benders' decomposition data structure probnumber the subproblem number
Definition at line 4245 of file benders.c.
References NULL, and SCIP_Benders::subproblems.
Referenced by computeStandardIntegerOptCut(), createSubproblems(), initialiseLPSubproblem(), initialiseSubproblem(), resetSubproblemObjectiveValue(), SCIP_DECL_BENDERSCUTEXEC(), SCIP_DECL_DIALOGEXEC(), SCIPbendersChgMastervarsToCont(), SCIPbendersComputeSubproblemLowerbound(), SCIPbendersExec(), SCIPbendersExecSubproblemSolve(), SCIPbendersFreeSubproblem(), SCIPbendersMergeSubproblemIntoMaster(), SCIPbendersSetMastervarsCont(), SCIPbendersSetupSubproblem(), SCIPbendersSolveSubproblem(), SCIPbendersSolveSubproblemCIP(), SCIPbendersSolveSubproblemLP(), SCIPcheckBendersSubproblemOptimality(), solveBendersSubproblems(), and updateEventhdlrUpperbound().
◆ SCIPbendersGetNCalls()
| int SCIPbendersGetNCalls | ( | SCIP_BENDERS * | benders | ) |
gets the number of times, the Bender' decomposition was called and tried to find a violated second stage constraint
gets the number of times, the Benders' decomposition was called and tried to find a variable with negative reduced costs
- Parameters
-
benders Benders' decomposition
Definition at line 4257 of file benders.c.
References SCIP_Benders::ncalls, and NULL.
Referenced by SCIP_DECL_BENDERSCUTEXEC(), and SCIPprintBendersStatistics().
◆ SCIPbendersGetNCutsFound()
| int SCIPbendersGetNCutsFound | ( | SCIP_BENDERS * | benders | ) |
gets the number of optimality cuts found by the collection of Benders' decomposition subproblems
- Parameters
-
benders Benders' decomposition
Definition at line 4267 of file benders.c.
References SCIP_Benders::ncutsfound, and NULL.
Referenced by SCIPprintBendersStatistics().
◆ SCIPbendersGetSetupTime()
| SCIP_Real SCIPbendersGetSetupTime | ( | SCIP_BENDERS * | benders | ) |
gets time in seconds used in this Benders' decomposition for setting up for next stages
- Parameters
-
benders Benders' decomposition
Definition at line 4277 of file benders.c.
References NULL, SCIPclockGetTime(), and SCIP_Benders::setuptime.
Referenced by SCIPprintBendersStatistics().
◆ SCIPbendersGetTime()
| SCIP_Real SCIPbendersGetTime | ( | SCIP_BENDERS * | benders | ) |
gets execution time in seconds used in this Benders' decomposition
gets time in seconds used in this Benders' decomposition
- Parameters
-
benders Benders' decomposition
Definition at line 4287 of file benders.c.
References SCIP_Benders::bendersclock, NULL, and SCIPclockGetTime().
Referenced by SCIPprintBendersStatistics().
◆ SCIPbendersIsInitialized()
| SCIP_Bool SCIPbendersIsInitialized | ( | SCIP_BENDERS * | benders | ) |
Is Benders' decomposition initialized?
is Benders' decomposition initialized?
- Parameters
-
benders Benders' decomposition
Definition at line 4309 of file benders.c.
References SCIP_Benders::initialized, and NULL.
◆ SCIPbendersIsActive()
| SCIP_Bool SCIPbendersIsActive | ( | SCIP_BENDERS * | benders | ) |
returns whether the given Benders' decomposition is in use in the current problem
- Parameters
-
benders the Benders' decomposition structure
Definition at line 1927 of file benders.c.
References SCIP_Benders::active, and NULL.
Referenced by SCIP_DECL_BENDERSCOPY(), SCIP_DECL_DIALOGEXEC(), SCIP_DECL_EVENTINITSOL(), SCIPbendersCopyInclude(), and SCIPprintBendersStatistics().
◆ SCIPbendersOnlyCheckConvexRelax()
| SCIP_Bool SCIPbendersOnlyCheckConvexRelax | ( | SCIP_BENDERS * | benders | ) |
Returns whether only the convex relaxations will be checked in this solve loop when Benders' is used in the LNS heuristics, only the convex relaxations of the master/subproblems are checked, i.e. no integer cuts are generated. In this case, then Benders' decomposition is performed under the assumption that all subproblems are convex relaxations.
- Parameters
-
benders Benders' decomposition
Definition at line 1996 of file benders.c.
References SCIP_Benders::iscopy, and SCIP_Benders::lnscheck.
Referenced by executeUserDefinedSolvesub(), generateBendersCuts(), numSubproblemsToCheck(), SCIP_DECL_EVENTINITSOL(), SCIPbendersExec(), and solveBendersSubproblems().
◆ SCIPbendersCutLP()
| SCIP_Bool SCIPbendersCutLP | ( | SCIP_BENDERS * | benders | ) |
Are Benders' cuts generated from the LP solutions?
- Parameters
-
benders Benders' decomposition
Definition at line 4319 of file benders.c.
References SCIP_Benders::cutlp, and NULL.
Referenced by SCIPconsBendersEnforceSolution().
◆ SCIPbendersCutPseudo()
| SCIP_Bool SCIPbendersCutPseudo | ( | SCIP_BENDERS * | benders | ) |
Are Benders' cuts generated from the pseudo solutions?
- Parameters
-
benders Benders' decomposition
Definition at line 4329 of file benders.c.
References SCIP_Benders::cutpseudo, and NULL.
Referenced by SCIPconsBendersEnforceSolution().
◆ SCIPbendersCutRelaxation()
| SCIP_Bool SCIPbendersCutRelaxation | ( | SCIP_BENDERS * | benders | ) |
Are Benders' cuts generated from the relaxation solutions?
- Parameters
-
benders Benders' decomposition
Definition at line 4339 of file benders.c.
References SCIP_Benders::cutrelax, and NULL.
Referenced by SCIPconsBendersEnforceSolution().
◆ SCIPbendersShareAuxVars()
| SCIP_Bool SCIPbendersShareAuxVars | ( | SCIP_BENDERS * | benders | ) |
Should this Benders' use the auxiliary variables from the highest priority Benders'?
should this Benders' use the auxiliary variables from the highest priority Benders'
- Parameters
-
benders Benders' decomposition
Definition at line 4349 of file benders.c.
References NULL, and SCIP_Benders::shareauxvars.
Referenced by addAuxiliaryVariablesToMaster(), and assignAuxiliaryVariables().
◆ SCIPbendersGetAuxiliaryVar()
| SCIP_VAR* SCIPbendersGetAuxiliaryVar | ( | SCIP_BENDERS * | benders, |
| int | probnumber | ||
| ) |
returns the auxiliary variable for the given subproblem
- Parameters
-
benders Benders' decomposition probnumber the subproblem number
Definition at line 4389 of file benders.c.
References SCIP_Benders::auxiliaryvars, NULL, and SCIPbendersGetNSubproblems().
Referenced by addAuxiliaryVariablesToMaster(), addAuxiliaryVariableToCut(), SCIP_DECL_CONSPRESOL(), SCIPbendersGetAuxiliaryVarVal(), SCIPbendersMergeSubproblemIntoMaster(), updateAuxiliaryVarLowerbound(), and updateSubproblemLowerbound().
◆ SCIPbendersGetAuxiliaryVars()
| SCIP_VAR** SCIPbendersGetAuxiliaryVars | ( | SCIP_BENDERS * | benders | ) |
returns all auxiliary variables
- Parameters
-
benders Benders' decomposition
Definition at line 4401 of file benders.c.
References SCIP_Benders::auxiliaryvars, and NULL.
Referenced by constructValidSolution().
◆ SCIPbendersSetSubproblemObjval()
| void SCIPbendersSetSubproblemObjval | ( | SCIP_BENDERS * | benders, |
| int | probnumber, | ||
| SCIP_Real | objval | ||
| ) |
stores the objective function value of the subproblem for use in cut generation
- Parameters
-
benders the Benders' decomposition structure probnumber the subproblem number objval the objective function value for the subproblem
Definition at line 4411 of file benders.c.
References SCIP_Benders::bestsubprobobjval, NULL, SCIPbendersGetNSubproblems(), and SCIP_Benders::subprobobjval.
Referenced by resetSubproblemObjectiveValue(), SCIPbendersExecSubproblemSolve(), and solveBendersSubproblems().
◆ SCIPbendersGetSubproblemObjval()
| SCIP_Real SCIPbendersGetSubproblemObjval | ( | SCIP_BENDERS * | benders, |
| int | probnumber | ||
| ) |
returns the objective function value of the subproblem for use in cut generation
- Parameters
-
benders Benders' decomposition probnumber the subproblem number
Definition at line 4428 of file benders.c.
References NULL, SCIPbendersGetNSubproblems(), and SCIP_Benders::subprobobjval.
Referenced by computeStandardIntegerOptCut(), constructValidSolution(), SCIPbendersCheckSubproblemOptimality(), and solveBendersSubproblems().
◆ SCIPfindBenderscut()
| SCIP_BENDERSCUT* SCIPfindBenderscut | ( | SCIP_BENDERS * | benders, |
| const char * | name | ||
| ) |
returns the Benders' cut of the given name, or NULL if not existing
- Parameters
-
benders Benders' decomposition name name of Benderscut' decomposition
Definition at line 4796 of file benders.c.
References SCIP_Benders::benderscuts, SCIP_Benders::nbenderscuts, NULL, and SCIPbenderscutGetName().
Referenced by SCIPfindObjBenderscut(), SCIPincludeBenderscut(), and SCIPincludeBenderscutBasic().
◆ SCIPbendersGetBenderscuts()
| SCIP_BENDERSCUT** SCIPbendersGetBenderscuts | ( | SCIP_BENDERS * | benders | ) |
returns the array of currently available Benders' cuts; active Benders' decomposition are in the first slots of the array
- Parameters
-
benders Benders' decomposition
Definition at line 4818 of file benders.c.
References SCIP_Benders::benderscuts, SCIP_Benders::benderscutsnamessorted, SCIP_Benders::benderscutssorted, FALSE, SCIP_Benders::nbenderscuts, NULL, SCIPsortPtr(), and TRUE.
Referenced by generateBendersCuts(), and SCIPprintBendersStatistics().
◆ SCIPbendersGetNBenderscuts()
| int SCIPbendersGetNBenderscuts | ( | SCIP_BENDERS * | benders | ) |
returns the number of currently available Benders' cuts
- Parameters
-
benders Benders' decomposition
Definition at line 4835 of file benders.c.
References SCIP_Benders::nbenderscuts, and NULL.
Referenced by generateBendersCuts(), and SCIPprintBendersStatistics().
◆ SCIPbendersSetBenderscutPriority()
| SCIP_RETCODE SCIPbendersSetBenderscutPriority | ( | SCIP_BENDERS * | benders, |
| SCIP_BENDERSCUT * | benderscut, | ||
| int | priority | ||
| ) |
sets the priority of a Benders' decomposition
- Parameters
-
benders Benders' decomposition benderscut Benders' cut priority new priority of the Benders' decomposition
Definition at line 4845 of file benders.c.
References SCIP_Benders::benderscutssorted, FALSE, NULL, SCIP_Benderscut::priority, and SCIP_OKAY.
◆ SCIPbendersSetSubproblemIsConvex()
| void SCIPbendersSetSubproblemIsConvex | ( | SCIP_BENDERS * | benders, |
| int | probnumber, | ||
| SCIP_Bool | isconvex | ||
| ) |
sets the flag indicating whether a subproblem is convex
It is possible that this can change during the solving process. One example is when the three-phase method is employed, where the first phase solves the convex relaxation of both the master and subproblems, the second phase reintroduces the integrality constraints to the master problem and the third phase then reintroduces integrality constraints to the subproblems.
- Parameters
-
benders Benders' decomposition probnumber the subproblem number isconvex flag to indicate whether the subproblem is convex
Definition at line 4446 of file benders.c.
References SCIP_Benders::nconvexsubprobs, SCIP_Benders::nsubproblems, NULL, SCIPbendersGetNSubproblems(), and SCIP_Benders::subprobisconvex.
Referenced by createSubproblems(), SCIPbendersChgMastervarsToCont(), and SCIPbendersSetMastervarsCont().
◆ SCIPbendersSubproblemIsConvex()
| SCIP_Bool SCIPbendersSubproblemIsConvex | ( | SCIP_BENDERS * | benders, |
| int | probnumber | ||
| ) |
returns whether the subproblem is convex
This means that the dual solution can be used to generate cuts.
- Parameters
-
benders Benders' decomposition probnumber the subproblem number
Definition at line 4469 of file benders.c.
References NULL, SCIPbendersGetNSubproblems(), and SCIP_Benders::subprobisconvex.
Referenced by generateBendersCuts(), SCIP_DECL_DIALOGEXEC(), SCIPbendersComputeSubproblemLowerbound(), SCIPbendersExecSubproblemSolve(), SCIPbendersFreeSubproblem(), SCIPbendersSetupSubproblem(), SCIPbendersSolveSubproblem(), and solveBendersSubproblems().
◆ SCIPbendersGetNConvexSubproblems()
| int SCIPbendersGetNConvexSubproblems | ( | SCIP_BENDERS * | benders | ) |
returns the number of subproblems that are convex
- Parameters
-
benders Benders' decomposition
Definition at line 4481 of file benders.c.
References SCIP_Benders::nconvexsubprobs, and NULL.
Referenced by generateBendersCuts(), SCIP_DECL_EVENTEXEC(), and SCIPbendersExec().
◆ SCIPbendersSolveSubproblemLP()
| SCIP_RETCODE SCIPbendersSolveSubproblemLP | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| int | probnumber, | ||
| SCIP_Bool * | infeasible | ||
| ) |
solves the LP of the Benders' decomposition subproblem
This requires that the subproblem is in probing mode.
- Parameters
-
scip the SCIP data structure benders the Benders' decomposition data structure probnumber the subproblem number infeasible a flag to indicate whether all subproblems are feasible
Definition at line 3442 of file benders.c.
References FALSE, NULL, resetOrigSubproblemParams(), SCIP_Bool, SCIP_CALL, SCIP_LPSOLSTAT_ERROR, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_LPSOLSTAT_OPTIMAL, SCIP_LPSOLSTAT_TIMELIMIT, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_OKAY, SCIPABORT, SCIPallocBlockMemory, SCIPbendersSubproblem(), SCIPbendersSubproblemIsSetup(), SCIPerrorMessage, SCIPfreeBlockMemory, SCIPgetLPSolstat(), SCIPinProbing(), SCIPisLPConstructed(), SCIPsolveProbingLP(), setSubproblemParams(), storeOrigSubproblemParams(), and TRUE.
Referenced by SCIPbendersExecSubproblemSolve(), and SCIPbendersSolveSubproblem().
◆ SCIPbendersSolveSubproblemCIP()
| SCIP_RETCODE SCIPbendersSolveSubproblemCIP | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| int | probnumber, | ||
| SCIP_Bool * | infeasible, | ||
| SCIP_BENDERSENFOTYPE | type, | ||
| SCIP_Bool | solvecip | ||
| ) |
solves the Benders' decomposition subproblem
- Parameters
-
scip the SCIP data structure benders the Benders' decomposition data structure probnumber the subproblem number infeasible returns whether the current subproblem is infeasible type the enforcement type calling this function solvecip directly solve the CIP subproblem
Definition at line 3501 of file benders.c.
References FALSE, MIPNODEFOCUS_EVENTHDLR_NAME, NULL, resetOrigSubproblemParams(), SCIP_BENDERSENFOTYPE_CHECK, SCIP_CALL, SCIP_OKAY, SCIP_PARAMSETTING_FAST, SCIP_STAGE_SOLVING, SCIP_STATUS_BESTSOLLIMIT, SCIP_STATUS_INFEASIBLE, SCIP_STATUS_MEMLIMIT, SCIP_STATUS_OPTIMAL, SCIP_STATUS_TIMELIMIT, SCIP_STATUS_UNBOUNDED, SCIP_STATUS_USERINTERRUPT, SCIP_VERBLEVEL_FULL, SCIPABORT, SCIPallocBlockMemory, SCIPbendersSubproblem(), SCIPendProbing(), SCIPerrorMessage, SCIPeventhdlrGetData(), SCIPfindEventhdlr(), SCIPfreeBlockMemory, SCIPgetStage(), SCIPgetStatus(), SCIPinProbing(), SCIPrestartSolve(), SCIPsetBoolParam(), SCIPsetHeuristics(), SCIPsetIntParam(), SCIPsolve(), setSubproblemParams(), storeOrigSubproblemParams(), and TRUE.
Referenced by initialiseSubproblem(), SCIPbendersExecSubproblemSolve(), and SCIPbendersSolveSubproblem().
◆ SCIPbendersGetNTransferredCuts()
| int SCIPbendersGetNTransferredCuts | ( | SCIP_BENDERS * | benders | ) |
returns the number of cuts that have been transferred from sub SCIPs to the master SCIP
- Parameters
-
benders the Benders' decomposition data structure
Definition at line 4717 of file benders.c.
References SCIP_Benders::ntransferred, and NULL.
Referenced by createAndAddTransferredCut(), and SCIPprintBendersStatistics().
◆ SCIPbendersUpdateSubproblemLowerbound()
| void SCIPbendersUpdateSubproblemLowerbound | ( | SCIP_BENDERS * | benders, |
| int | probnumber, | ||
| SCIP_Real | lowerbound | ||
| ) |
updates the lower bound for the subproblem. If the lower bound is not greater than the previously stored lowerbound, then no update occurs.
- Parameters
-
benders Benders' decomposition probnumber the subproblem number lowerbound the lower bound
Definition at line 4729 of file benders.c.
References NULL, SCIPbendersGetNSubproblems(), SCIPdebugMessage, and SCIP_Benders::subproblowerbound.
Referenced by SCIP_DECL_CONSPRESOL(), updateAuxiliaryVarLowerbound(), and updateSubproblemLowerbound().
◆ SCIPbendersGetSubproblemLowerbound()
| SCIP_Real SCIPbendersGetSubproblemLowerbound | ( | SCIP_BENDERS * | benders, |
| int | probnumber | ||
| ) |
returns the stored lower bound for the given subproblem
- Parameters
-
benders Benders' decomposition probnumber the subproblem number
Definition at line 4748 of file benders.c.
References NULL, SCIPbendersGetNSubproblems(), and SCIP_Benders::subproblowerbound.
Referenced by generateAndApplyBendersIntegerCuts(), solveBendersSubproblems(), and updateSubproblemLowerbound().
◆ SCIPbendersSetSubproblemIsIndependent()
| void SCIPbendersSetSubproblemIsIndependent | ( | SCIP_BENDERS * | benders, |
| int | probnumber, | ||
| SCIP_Bool | isindep | ||
| ) |
sets the independent subproblem flag
- Parameters
-
benders Benders' decomposition probnumber the subproblem number isindep flag to indicate whether the subproblem is independent
Definition at line 4586 of file benders.c.
References SCIP_Benders::indepsubprob, SCIP_Benders::nactivesubprobs, SCIP_Benders::name, NULL, SCIP_Bool, SCIPABORT, SCIPbendersGetNSubproblems(), SCIPerrorMessage, and subproblemIsActive().
Referenced by checkSubproblemIndependence(), and SCIPbendersExitsol().
◆ SCIPbendersSubproblemIsIndependent()
| SCIP_Bool SCIPbendersSubproblemIsIndependent | ( | SCIP_BENDERS * | benders, |
| int | probnumber | ||
| ) |
returns whether the subproblem is independent
- Parameters
-
benders Benders' decomposition probnumber the subproblem number
Definition at line 4626 of file benders.c.
References SCIP_Benders::indepsubprob, NULL, and SCIPbendersGetNSubproblems().
Referenced by SCIPbendersComputeSubproblemLowerbound(), SCIPbendersExitsol(), SCIPbendersSolveSubproblem(), and subproblemIsActive().
◆ SCIPbendersSubproblemIsEnabled()
| SCIP_Bool SCIPbendersSubproblemIsEnabled | ( | SCIP_BENDERS * | benders, |
| int | probnumber | ||
| ) |
returns whether the subproblem is enabled, i.e. the subproblem is still solved in the solving loop.
- Parameters
-
benders Benders' decomposition probnumber the subproblem number
Definition at line 4666 of file benders.c.
References NULL, SCIPbendersGetNSubproblems(), and SCIP_Benders::subprobenabled.
Referenced by subproblemIsActive().
◆ SCIPincludeBenders()
| SCIP_RETCODE SCIPincludeBenders | ( | SCIP * | scip, |
| const char * | name, | ||
| const char * | desc, | ||
| int | priority, | ||
| SCIP_Bool | cutlp, | ||
| SCIP_Bool | cutpseudo, | ||
| SCIP_Bool | cutrelax, | ||
| SCIP_Bool | shareauxvars, | ||
| SCIP_DECL_BENDERSCOPY((*benderscopy)) | , | ||
| SCIP_DECL_BENDERSFREE((*bendersfree)) | , | ||
| SCIP_DECL_BENDERSINIT((*bendersinit)) | , | ||
| SCIP_DECL_BENDERSEXIT((*bendersexit)) | , | ||
| SCIP_DECL_BENDERSINITPRE((*bendersinitpre)) | , | ||
| SCIP_DECL_BENDERSEXITPRE((*bendersexitpre)) | , | ||
| SCIP_DECL_BENDERSINITSOL((*bendersinitsol)) | , | ||
| SCIP_DECL_BENDERSEXITSOL((*bendersexitsol)) | , | ||
| SCIP_DECL_BENDERSGETVAR((*bendersgetvar)) | , | ||
| SCIP_DECL_BENDERSCREATESUB((*benderscreatesub)) | , | ||
| SCIP_DECL_BENDERSPRESUBSOLVE((*benderspresubsolve)) | , | ||
| SCIP_DECL_BENDERSSOLVESUBCONVEX((*benderssolvesubconvex)) | , | ||
| SCIP_DECL_BENDERSSOLVESUB((*benderssolvesub)) | , | ||
| SCIP_DECL_BENDERSPOSTSOLVE((*benderspostsolve)) | , | ||
| SCIP_DECL_BENDERSFREESUB((*bendersfreesub)) | , | ||
| SCIP_BENDERSDATA * | bendersdata | ||
| ) |
creates a Benders' decomposition and includes it in SCIP
To use the Benders' decomposition for solving a problem, it first has to be activated with a call to SCIPactivateBenders(). This should be done during the problem creation stage.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Note
- method has all Benders' decomposition callbacks as arguments and is thus changed every time a new callback is added in future releases; consider using SCIPincludeBendersBasic() and setter functions if you seek for a method which is less likely to change in future releases
- Parameters
-
scip SCIP data structure name name of Benders' decomposition desc description of Benders' decomposition priority priority of the Benders' decomposition cutlp should Benders' cuts be generated for LP solutions cutpseudo should Benders' cuts be generated for pseudo solutions cutrelax should Benders' cuts be generated for relaxation solutions shareauxvars should this Benders' use the highest priority Benders aux vars bendersdata Benders' decomposition data
Definition at line 143 of file scip_benders.c.
References FALSE, Scip::mem, Scip::messagehdlr, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPbendersCreate(), SCIPcheckStage(), SCIPerrorMessage, SCIPfindBenders(), SCIPsetIncludeBenders(), Scip::set, SCIP_Mem::setmem, and TRUE.
Referenced by SCIPincludeObjBenders().
◆ SCIPincludeBendersBasic()
| SCIP_RETCODE SCIPincludeBendersBasic | ( | SCIP * | scip, |
| SCIP_BENDERS ** | bendersptr, | ||
| const char * | name, | ||
| const char * | desc, | ||
| int | priority, | ||
| SCIP_Bool | cutlp, | ||
| SCIP_Bool | cutpseudo, | ||
| SCIP_Bool | cutrelax, | ||
| SCIP_Bool | shareauxvars, | ||
| SCIP_DECL_BENDERSGETVAR((*bendersgetvar)) | , | ||
| SCIP_DECL_BENDERSCREATESUB((*benderscreatesub)) | , | ||
| SCIP_BENDERSDATA * | bendersdata | ||
| ) |
creates a Benders' decomposition and includes it in SCIP with all non-fundamental callbacks set to NULL
If needed, the non-fundamental callbacks can be added afterwards via setter functions SCIPsetBendersCopy(), SCIPsetBendersFree(), SCIPsetBendersInity(), SCIPsetBendersExit(), SCIPsetBendersInitsol(), SCIPsetBendersExitsol(), SCIPsetBendersFarkas().
To use the Benders' decomposition for solving a problem, it first has to be activated with a call to SCIPactivateBenders(). This should be done during the problem creation stage.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Note
- if you want to set all callbacks with a single method call, consider using SCIPincludeBenders() instead
- Parameters
-
scip SCIP data structure bendersptr reference to a benders, or NULL name name of Benders' decomposition desc description of Benders' decomposition priority priority of the Benders' decomposition cutlp should Benders' cuts be generated for LP solutions cutpseudo should Benders' cuts be generated for pseudo solutions cutrelax should Benders' cuts be generated for relaxation solutions shareauxvars should this Benders' use the highest priority Benders aux vars bendersdata Benders' decomposition data
Definition at line 218 of file scip_benders.c.
References FALSE, Scip::mem, Scip::messagehdlr, NULL, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPbendersCreate(), SCIPcheckStage(), SCIPerrorMessage, SCIPfindBenders(), SCIPsetIncludeBenders(), Scip::set, SCIP_Mem::setmem, and TRUE.
Referenced by SCIPincludeBendersDefault().
◆ SCIPsetBendersCopy()
| SCIP_RETCODE SCIPsetBendersCopy | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSCOPY((*benderscopy)) | |||
| ) |
sets copy method of benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 264 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetCopy(), SCIPcheckStage(), and TRUE.
Referenced by SCIPincludeBendersDefault().
◆ SCIPsetBendersFree()
| SCIP_RETCODE SCIPsetBendersFree | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSFREE((*bendersfree)) | |||
| ) |
sets destructor method of benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 288 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetFree(), SCIPcheckStage(), and TRUE.
Referenced by SCIPincludeBendersDefault().
◆ SCIPsetBendersInit()
| SCIP_RETCODE SCIPsetBendersInit | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSINIT((*bendersinit)) | |||
| ) |
sets initialization method of benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 312 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetInit(), SCIPcheckStage(), and TRUE.
Referenced by SCIPincludeBendersDefault().
◆ SCIPsetBendersExit()
| SCIP_RETCODE SCIPsetBendersExit | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSEXIT((*bendersexit)) | |||
| ) |
sets deinitialization method of benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 336 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetExit(), SCIPcheckStage(), and TRUE.
◆ SCIPsetBendersInitpre()
| SCIP_RETCODE SCIPsetBendersInitpre | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSINITPRE((*bendersinitpre)) | |||
| ) |
sets presolving initialization method of benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 360 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetInitpre(), SCIPcheckStage(), and TRUE.
◆ SCIPsetBendersExitpre()
| SCIP_RETCODE SCIPsetBendersExitpre | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSEXITPRE((*bendersexitpre)) | |||
| ) |
sets presolving deinitialization method of benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 384 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetExitpre(), SCIPcheckStage(), and TRUE.
◆ SCIPsetBendersInitsol()
| SCIP_RETCODE SCIPsetBendersInitsol | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSINITSOL((*bendersinitsol)) | |||
| ) |
sets solving process initialization method of benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 408 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetInitsol(), SCIPcheckStage(), and TRUE.
◆ SCIPsetBendersExitsol()
| SCIP_RETCODE SCIPsetBendersExitsol | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSEXITSOL((*bendersexitsol)) | |||
| ) |
sets solving process deinitialization method of benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 432 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetExitsol(), SCIPcheckStage(), and TRUE.
◆ SCIPsetBendersPresubsolve()
| SCIP_RETCODE SCIPsetBendersPresubsolve | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSPRESUBSOLVE((*benderspresubsolve)) | |||
| ) |
sets the method called prior to solving the subproblems for benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 456 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetPresubsolve(), SCIPcheckStage(), and TRUE.
◆ SCIPsetBendersSolveAndFreesub()
| SCIP_RETCODE SCIPsetBendersSolveAndFreesub | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSSOLVESUBCONVEX((*benderssolvesubconvex)) | , | ||
| SCIP_DECL_BENDERSSOLVESUB((*benderssolvesub)) | , | ||
| SCIP_DECL_BENDERSFREESUB((*bendersfreesub)) | |||
| ) |
sets the subproblem solving and freeing methods for Benders' decomposition
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 480 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPbendersGetName(), SCIPbendersSetFreesub(), SCIPbendersSetSolvesub(), SCIPbendersSetSolvesubconvex(), SCIPcheckStage(), SCIPerrorMessage, and TRUE.
◆ SCIPsetBendersPostsolve()
| SCIP_RETCODE SCIPsetBendersPostsolve | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_DECL_BENDERSPOSTSOLVE((*benderspostsolve)) | |||
| ) |
sets the post solving methods for benders
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 520 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetPostsolve(), SCIPcheckStage(), and TRUE.
◆ SCIPfindBenders()
| SCIP_BENDERS* SCIPfindBenders | ( | SCIP * | scip, |
| const char * | name | ||
| ) |
returns the Benders' decomposition of the given name, or NULL if not existing
- Parameters
-
scip SCIP data structure name name of Benders' decomposition
Definition at line 536 of file scip_benders.c.
References NULL, SCIPsetFindBenders(), and Scip::set.
Referenced by createAndAddTransferredCut(), SCIPcreateBendersDefault(), SCIPfindObjBenders(), SCIPfindObjBenderscut(), SCIPincludeBenders(), SCIPincludeBendersBasic(), SCIPincludeObjBenderscut(), and transferBendersCuts().
◆ SCIPgetBenders()
| SCIP_BENDERS** SCIPgetBenders | ( | SCIP * | scip | ) |
returns the array of currently available Benders' decomposition; active Benders' decomposition are in the first slots of the array
- Parameters
-
scip SCIP data structure
Definition at line 551 of file scip_benders.c.
References SCIP_Set::benders, NULL, SCIPsetSortBenders(), and Scip::set.
Referenced by addAuxiliaryVariablesToMaster(), assignAuxiliaryVariables(), constructValidSolution(), SCIP_DECL_CONSCHECK(), SCIP_DECL_CONSPRESOL(), SCIP_DECL_DIALOGEXEC(), SCIPconsBendersEnforceSolution(), SCIPprintBendersStatistics(), and SCIPsetBenderscutPriority().
◆ SCIPgetNBenders()
| int SCIPgetNBenders | ( | SCIP * | scip | ) |
returns the number of currently available Benders' decomposition
- Parameters
-
scip SCIP data structure
Definition at line 564 of file scip_benders.c.
References SCIP_Set::nbenders, NULL, and Scip::set.
Referenced by SCIP_DECL_DIALOGEXEC(), SCIPprintBendersStatistics(), and SCIPsetBenderscutPriority().
◆ SCIPgetNActiveBenders()
| int SCIPgetNActiveBenders | ( | SCIP * | scip | ) |
returns the number of currently active Benders' decomposition
- Parameters
-
scip SCIP data structure
Definition at line 575 of file scip_benders.c.
References SCIP_Set::nactivebenders, NULL, and Scip::set.
Referenced by constructValidSolution(), SCIP_DECL_CONSCHECK(), SCIP_DECL_CONSPRESOL(), SCIP_DECL_DIALOGEXEC(), SCIPconsBendersEnforceSolution(), and SCIPprintBendersStatistics().
◆ SCIPactivateBenders()
| SCIP_RETCODE SCIPactivateBenders | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| int | nsubproblems | ||
| ) |
activates the Benders' decomposition to be used for the current problem
This method should be called during the problem creation stage for all pricers that are necessary to solve the problem model.
- Note
- The Benders' decompositions are automatically deactivated when the problem is freed.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders the Benders' decomposition structure nsubproblems the number of subproblems in the Benders' decomposition
Definition at line 598 of file scip_benders.c.
References FALSE, SCIP_CALL, SCIP_OKAY, SCIPbendersActivate(), SCIPcheckStage(), Scip::set, and TRUE.
Referenced by SCIPcreateBendersDefault().
◆ SCIPdeactivateBenders()
| SCIP_RETCODE SCIPdeactivateBenders | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders | ||
| ) |
deactivates the Benders' decomposition
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders the Benders' decomposition structure
Definition at line 620 of file scip_benders.c.
References FALSE, SCIP_CALL, SCIP_OKAY, SCIPbendersDeactivate(), SCIPcheckStage(), Scip::set, and TRUE.
◆ SCIPsetBendersPriority()
| void SCIPsetBendersPriority | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| int | priority | ||
| ) |
sets the priority of a Benders' decomposition
- Parameters
-
scip SCIP data structure benders Benders' decomposition priority new priority of the Benders' decomposition
Definition at line 633 of file scip_benders.c.
References NULL, SCIPbendersSetPriority(), and Scip::set.
Referenced by SCIP_DECL_PARAMCHGD().
◆ SCIPsolveBendersSubproblems()
| SCIP_RETCODE SCIPsolveBendersSubproblems | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_SOL * | sol, | ||
| SCIP_RESULT * | result, | ||
| SCIP_Bool * | infeasible, | ||
| SCIP_Bool * | auxviol, | ||
| SCIP_BENDERSENFOTYPE | type, | ||
| SCIP_Bool | checkint | ||
| ) |
calls the exec method of Benders' decomposition to solve the subproblems
The checkint flag indicates whether integer feasibility can be assumed. If it is not assumed, i.e. checkint == FALSE, then only the convex relaxations of the subproblems are solved. If integer feasibility is assumed, i.e. checkint == TRUE, then the convex relaxations and the full CIP are solved to generate Benders' cuts and check solution feasibility.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition sol primal CIP solution, can be NULL result result of the pricing process infeasible is the master problem infeasible with respect to the Benders' cuts? auxviol set to TRUE only if the solution is feasible but the aux vars are violated type the type of solution being enforced checkint should the integer solution be checked by the subproblems
Definition at line 665 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersExec(), SCIPcheckStage(), Scip::set, and TRUE.
Referenced by SCIP_DECL_CONSCHECK(), and SCIPconsBendersEnforceSolution().
◆ SCIPgetBendersMasterVar()
| SCIP_RETCODE SCIPgetBendersMasterVar | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_VAR * | var, | ||
| SCIP_VAR ** | mappedvar | ||
| ) |
returns the master problem variable for the given subproblem variable
This function is used as part of the cut generation process.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition var the subproblem variable mappedvar pointer to store the master variable that var is mapped to
Definition at line 703 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersGetVar(), SCIPcheckStage(), Scip::set, and TRUE.
Referenced by computeStandardFeasibilityCut(), computeStandardOptimalityCut(), and SCIPbendersMergeSubproblemIntoMaster().
◆ SCIPgetBendersSubproblemVar()
| SCIP_RETCODE SCIPgetBendersSubproblemVar | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_VAR * | var, | ||
| SCIP_VAR ** | mappedvar, | ||
| int | probnumber | ||
| ) |
returns the subproblem problem variable for the given master variable
This function is used as part of the cut generation process.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition var the master variable mappedvar pointer to store the subproblem variable that var is mapped to probnumber the subproblem number
Definition at line 739 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersGetVar(), SCIPcheckStage(), SCIPgetBendersNSubproblems(), Scip::set, and TRUE.
Referenced by checkSubproblemIndependence(), and computeStandardIntegerOptCut().
◆ SCIPgetBendersNSubproblems()
| int SCIPgetBendersNSubproblems | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders | ||
| ) |
returns the number of subproblems that are stored in the given Benders' decomposition
- Returns
- the number of subproblems in the Benders' decomposition
- Parameters
-
scip SCIP data structure benders Benders' decomposition
Definition at line 765 of file scip_benders.c.
References NULL, and SCIPbendersGetNSubproblems().
Referenced by SCIPcomputeBendersSubproblemLowerbound(), SCIPfreeBendersSubproblem(), SCIPgetBendersSubproblemVar(), SCIPmergeBendersSubproblemIntoMaster(), SCIPsetupBendersSubproblem(), and SCIPsolveBendersSubproblem().
◆ SCIPaddBendersSubproblem()
| SCIP_RETCODE SCIPaddBendersSubproblem | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP * | subproblem | ||
| ) |
registers the Benders' decomposition subproblem with the Benders' decomposition struct.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
registers the Benders' decomposition subproblem with the Benders' decomposition struct
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition subproblem Benders' decomposition subproblem
Definition at line 784 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersAddSubproblem(), SCIPcheckStage(), and TRUE.
Referenced by SCIP_DECL_BENDERSCREATESUB().
◆ SCIPsetupBendersSubproblem()
| SCIP_RETCODE SCIPsetupBendersSubproblem | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_SOL * | sol, | ||
| int | probnumber | ||
| ) |
calls the generic subproblem setup method for a Benders' decomposition subproblem
This is called if the user requires to solve the Benders' decomposition subproblem separately from the main Benders' solving loop. This could be in the case of enhancement techniques.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
calls the generic subproblem setup method for a Benders' decomposition subproblem
This is called if the user requires to solve the Benders' decomposition subproblem separately from the main Benders' solving loop. This could be in the case of enhancement techniques.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders the Benders' decomposition data structure sol primal solution used to setup the problem, NULL for LP solution probnumber the subproblem number
Definition at line 819 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSetupSubproblem(), SCIPcheckStage(), SCIPgetBendersNSubproblems(), Scip::set, and TRUE.
Referenced by SCIP_DECL_DIALOGEXEC().
◆ SCIPsolveBendersSubproblem()
| SCIP_RETCODE SCIPsolveBendersSubproblem | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_SOL * | sol, | ||
| int | probnumber, | ||
| SCIP_Bool * | infeasible, | ||
| SCIP_BENDERSENFOTYPE | type, | ||
| SCIP_Bool | solvecip, | ||
| SCIP_Real * | objective | ||
| ) |
calls the solving method for a single Benders' decomposition subproblem
The method either calls the users solve subproblem method or calls the generic method. In the case of the generic method, the user must set up the subproblem prior to calling this method.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
calls the solving method for a single Benders' decomposition subproblem
The method either calls the users solve subproblem method or calls the generic method. In the case of the generic method, the user must set up the subproblem prior to calling this method.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition sol primal CIP solution, can be NULL for the current LP/Pseudo solution probnumber the subproblem number infeasible returns whether the current subproblem is infeasible type the enforcement type calling this function solvecip directly solve the CIP subproblem objective the objective function value of the subproblem, can be NULL
Definition at line 856 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersSolveSubproblem(), SCIPcheckStage(), SCIPgetBendersNSubproblems(), Scip::set, and TRUE.
Referenced by SCIP_DECL_DIALOGEXEC().
◆ SCIPfreeBendersSubproblem()
| SCIP_RETCODE SCIPfreeBendersSubproblem | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| int | probnumber | ||
| ) |
frees the subproblem after calling the solve subproblem method
This will either call the user defined free subproblem callback for Benders' decomposition or the default freeing methods. In the default case, if the subproblem is an LP, then SCIPendProbing is called. If the subproblem is a MIP, then SCIPfreeTransform is called.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
frees the subproblem after calling the solve subproblem method
This will either call the user defined free subproblem callback for Benders' decomposition or the default freeing methods. In the default case, if the subproblem is an LP, then SCIPendProbing is called. If the subproblem is a MIP, then SCIPfreeTransform is called.
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Parameters
-
scip SCIP data structure benders Benders' decomposition probnumber the subproblem number
Definition at line 900 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersFreeSubproblem(), SCIPcheckStage(), SCIPgetBendersNSubproblems(), Scip::set, and TRUE.
Referenced by SCIP_DECL_DIALOGEXEC().
◆ SCIPcheckBendersSubproblemOptimality()
| SCIP_RETCODE SCIPcheckBendersSubproblemOptimality | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_SOL * | sol, | ||
| int | probnumber, | ||
| SCIP_Bool * | optimal | ||
| ) |
checks the optimality of a Benders' decomposition subproblem by comparing the objective function value against the value of the corresponding auxiliary variable
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- This method can be called if requested subproblem is in one of the following stages:
checks the optimality of a Benders' decomposition subproblem by comparing the objective function value against the value of the corresponding auxiliary variable
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- This method can be called if requested subproblem is in one of the following stages:
- Parameters
-
scip SCIP data structure benders the benders' decomposition structure sol primal CIP solution, can be NULL for the current LP solution probnumber the number of the pricing problem optimal flag to indicate whether the current subproblem is optimal for the master
Definition at line 934 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersCheckSubproblemOptimality(), SCIPbendersGetNSubproblems(), SCIPbendersSubproblem(), SCIPcheckStage(), Scip::set, and TRUE.
Referenced by generateAndApplyBendersCuts(), and generateAndApplyBendersIntegerCuts().
◆ SCIPgetBendersAuxiliaryVarVal()
| SCIP_Real SCIPgetBendersAuxiliaryVarVal | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_SOL * | sol, | ||
| int | probnumber | ||
| ) |
returns the value of the auxiliary variable for a given subproblem
returns the value of the auxiliary variable for a given subproblem
- Returns
- the value of the auxiliary variable for the given subproblem
- Parameters
-
scip SCIP data structure benders the benders' decomposition structure sol primal CIP solution, can be NULL for the current LP solution probnumber the number of the pricing problem
Definition at line 960 of file scip_benders.c.
References NULL, SCIPbendersGetAuxiliaryVarVal(), SCIPbendersGetNSubproblems(), and Scip::set.
◆ SCIPcomputeBendersSubproblemLowerbound()
| SCIP_RETCODE SCIPcomputeBendersSubproblemLowerbound | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| int | probnumber, | ||
| SCIP_Real * | lowerbound, | ||
| SCIP_Bool * | infeasible | ||
| ) |
solves an independent subproblem to identify its lower bound and updates the lower bound of the corresponding auxiliary variable
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Parameters
-
scip the SCIP data structure benders Benders' decomposition probnumber the subproblem to be evaluated lowerbound the lowerbound for the subproblem infeasible was the subproblem found to be infeasible?
Definition at line 988 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersComputeSubproblemLowerbound(), SCIPcheckStage(), SCIPgetBendersNSubproblems(), Scip::set, and TRUE.
Referenced by SCIP_DECL_CONSPRESOL().
◆ SCIPmergeBendersSubproblemIntoMaster()
| SCIP_RETCODE SCIPmergeBendersSubproblemIntoMaster | ( | SCIP * | scip, |
| SCIP_BENDERS * | benders, | ||
| SCIP_HASHMAP * | varmap, | ||
| SCIP_HASHMAP * | consmap, | ||
| int | probnumber | ||
| ) |
merges a subproblem into the master problem.
This process just adds a copy of the subproblem variables and constraints to the master problem, but keeps the subproblem stored in the Benders' decomposition data structure. The reason for keeping the subproblem available is for when it is queried for solutions after the problem is solved.
Once the subproblem is merged into the master problem, then the subproblem is flagged as disabled. This means that it will not be solved in the subsequent subproblem solving loops.
The associated auxiliary variables are kept in the master problem. The objective function of the merged subproblem is added as an underestimator constraint.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
Merges a subproblem into the master problem. This process just adds a copy of the subproblem variables and constraints to the master problem, but keeps the subproblem stored in the Benders' decomposition data structure. The reason for keeping the subproblem available is for when it is queried for solutions after the problem is solved.
Once the subproblem is merged into the master problem, then the subproblem is flagged as disabled. This means that it will not be solved in the subsequent subproblem solving loops.
The associated auxiliary variables are kept in the master problem. The objective function of the merged subproblem is added as an underestimator constraint.
- Precondition
- This method can be called if SCIP is in one of the following stages:
- Returns
- SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.
- Parameters
-
scip the SCIP data structure benders Benders' decomposition varmap a hashmap to store the mapping of subproblem variables corresponding to the newly created master variables, or NULL consmap a hashmap to store the mapping of subproblem constraints to the corresponding newly created constraints, or NULL probnumber the number of the subproblem that will be merged into the master problem
Definition at line 1028 of file scip_benders.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPbendersMergeSubproblemIntoMaster(), SCIPcheckStage(), SCIPgetBendersNSubproblems(), Scip::set, and TRUE.