/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /* */ /* This file is part of the program and library */ /* SCIP --- Solving Constraint Integer Programs */ /* */ /* Copyright (C) 2002-2020 Konrad-Zuse-Zentrum */ /* fuer Informationstechnik Berlin */ /* */ /* SCIP is distributed under the terms of the ZIB Academic License. */ /* */ /* You should have received a copy of the ZIB Academic License */ /* along with SCIP; see the file COPYING. If not visit scipopt.org. */ /* */ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /**@file scip_cut.h * @ingroup PUBLICCOREAPI * @brief public methods for cuts and aggregation rows * @author Tobias Achterberg * @author Timo Berthold * @author Thorsten Koch * @author Alexander Martin * @author Marc Pfetsch * @author Kati Wolter * @author Gregor Hendel * @author Leona Gottwald */ /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ #ifndef __SCIP_SCIP_CUT_H__ #define __SCIP_SCIP_CUT_H__ #include "scip/def.h" #include "scip/type_cutpool.h" #include "scip/type_lp.h" #include "scip/type_result.h" #include "scip/type_retcode.h" #include "scip/type_scip.h" #include "scip/type_sol.h" #ifdef __cplusplus extern "C" { #endif /**@addtogroup PublicCutMethods * * @{ */ /** returns efficacy of the cut with respect to the given primal solution or the current LP solution: * e = -feasibility/norm * * @return the efficacy of the cut with respect to the given primal solution or the current LP solution: * e = -feasibility/norm * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_Real SCIPgetCutEfficacy( SCIP* scip, /**< SCIP data structure */ SCIP_SOL* sol, /**< primal CIP solution, or NULL for current LP solution */ SCIP_ROW* cut /**< separated cut */ ); /** returns whether the cut's efficacy with respect to the given primal solution or the current LP solution is greater * than the minimal cut efficacy * * @return TRUE if the cut's efficacy with respect to the given primal solution or the current LP solution is greater * than the minimal cut efficacy, otherwise FALSE * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_Bool SCIPisCutEfficacious( SCIP* scip, /**< SCIP data structure */ SCIP_SOL* sol, /**< primal CIP solution, or NULL for current LP solution */ SCIP_ROW* cut /**< separated cut */ ); /** checks, if the given cut's efficacy is larger than the minimal cut efficacy * * @return TRUE if the given cut's efficacy is larger than the minimal cut efficacy, otherwise FALSE */ SCIP_EXPORT SCIP_Bool SCIPisEfficacious( SCIP* scip, /**< SCIP data structure */ SCIP_Real efficacy /**< efficacy of the cut */ ); /** calculates the efficacy norm of the given vector, which depends on the "separating/efficacynorm" parameter * * @return the efficacy norm of the given vector, which depends on the "separating/efficacynorm" parameter */ SCIP_EXPORT SCIP_Real SCIPgetVectorEfficacyNorm( SCIP* scip, /**< SCIP data structure */ SCIP_Real* vals, /**< array of values */ int nvals /**< number of values */ ); /** indicates whether a cut is applicable * * If the cut has only one variable and this method returns FALSE, it may * still be possible that the cut can be added to the LP (as a row instead * of a boundchange), but it will be a very weak cut. The user is asked * to avoid such cuts. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING * * @return whether the cut is modifiable, not a bound change, or a bound change that changes bounds by at least epsilon */ SCIP_EXPORT SCIP_Bool SCIPisCutApplicable( SCIP* scip, /**< SCIP data structure */ SCIP_ROW* cut /**< separated cut */ ); /** adds cut to separation storage * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING * * @deprecated Please use SCIPaddRow() instead, or, if the row is a global cut and it might be useful to keep it for future use, * consider adding it to the global cutpool with SCIPaddPoolCut(). */ SCIP_DEPRECATED SCIP_EXPORT SCIP_RETCODE SCIPaddCut( SCIP* scip, /**< SCIP data structure */ SCIP_SOL* sol, /**< primal solution that was separated, or NULL for LP solution */ SCIP_ROW* cut, /**< separated cut */ SCIP_Bool forcecut, /**< should the cut be forced to enter the LP? */ SCIP_Bool* infeasible /**< pointer to store whether cut has been detected to be infeasible for local bounds */ ); /** adds row to separation storage * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPaddRow( SCIP* scip, /**< SCIP data structure */ SCIP_ROW* row, /**< row */ SCIP_Bool forcecut, /**< should the row be forced to enter the LP? */ SCIP_Bool* infeasible /**< pointer to store whether row has been detected to be infeasible for local bounds */ ); /** checks if cut is already existing in global cutpool * * @return TRUE is returned if the cut is not already existing in the global cutpool, FALSE otherwise * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_Bool SCIPisCutNew( SCIP* scip, /**< SCIP data structure */ SCIP_ROW* row /**< cutting plane to add */ ); /** if not already existing, adds row to global cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPaddPoolCut( SCIP* scip, /**< SCIP data structure */ SCIP_ROW* row /**< cutting plane to add */ ); /** removes the row from the global cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPdelPoolCut( SCIP* scip, /**< SCIP data structure */ SCIP_ROW* row /**< row to remove */ ); /** gets current cuts in the global cut pool * * @return the current cuts in the global cut pool * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING * - \ref SCIP_STAGE_SOLVED * - \ref SCIP_STAGE_EXITSOLVE */ SCIP_EXPORT SCIP_CUT** SCIPgetPoolCuts( SCIP* scip /**< SCIP data structure */ ); /** gets current number of rows in the global cut pool * * @return the current number of rows in the global cut pool * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING * - \ref SCIP_STAGE_SOLVED * - \ref SCIP_STAGE_EXITSOLVE */ SCIP_EXPORT int SCIPgetNPoolCuts( SCIP* scip /**< SCIP data structure */ ); /** gets the global cut pool used by SCIP * * @return the global cut pool used by SCIP * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING * - \ref SCIP_STAGE_SOLVED * - \ref SCIP_STAGE_EXITSOLVE */ SCIP_EXPORT SCIP_CUTPOOL* SCIPgetGlobalCutpool( SCIP* scip /**< SCIP data structure */ ); /** creates a cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_TRANSFORMING * - \ref SCIP_STAGE_TRANSFORMED * - \ref SCIP_STAGE_INITPRESOLVE * - \ref SCIP_STAGE_PRESOLVING * - \ref SCIP_STAGE_EXITPRESOLVE * - \ref SCIP_STAGE_PRESOLVED * - \ref SCIP_STAGE_INITSOLVE * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPcreateCutpool( SCIP* scip, /**< SCIP data structure */ SCIP_CUTPOOL** cutpool, /**< pointer to store cut pool */ int agelimit /**< maximum age a cut can reach before it is deleted from the pool */ ); /** frees a cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_TRANSFORMING * - \ref SCIP_STAGE_TRANSFORMED * - \ref SCIP_STAGE_INITPRESOLVE * - \ref SCIP_STAGE_PRESOLVING * - \ref SCIP_STAGE_EXITPRESOLVE * - \ref SCIP_STAGE_PRESOLVED * - \ref SCIP_STAGE_INITSOLVE * - \ref SCIP_STAGE_SOLVING * - \ref SCIP_STAGE_SOLVED * - \ref SCIP_STAGE_EXITSOLVE * - \ref SCIP_STAGE_FREETRANS */ SCIP_EXPORT SCIP_RETCODE SCIPfreeCutpool( SCIP* scip, /**< SCIP data structure */ SCIP_CUTPOOL** cutpool /**< pointer to store cut pool */ ); /** if not already existing, adds row to a cut pool and captures it * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_INITSOLVE * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPaddRowCutpool( SCIP* scip, /**< SCIP data structure */ SCIP_CUTPOOL* cutpool, /**< cut pool */ SCIP_ROW* row /**< cutting plane to add */ ); /** adds row to a cut pool and captures it; doesn't check for multiple cuts * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_INITSOLVE * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPaddNewRowCutpool( SCIP* scip, /**< SCIP data structure */ SCIP_CUTPOOL* cutpool, /**< cut pool */ SCIP_ROW* row /**< cutting plane to add */ ); /** removes the LP row from a cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_INITSOLVE * - \ref SCIP_STAGE_SOLVING * - \ref SCIP_STAGE_SOLVED */ SCIP_EXPORT SCIP_RETCODE SCIPdelRowCutpool( SCIP* scip, /**< SCIP data structure */ SCIP_CUTPOOL* cutpool, /**< cut pool */ SCIP_ROW* row /**< row to remove */ ); /** separates cuts from a cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPseparateCutpool( SCIP* scip, /**< SCIP data structure */ SCIP_CUTPOOL* cutpool, /**< cut pool */ SCIP_RESULT* result /**< pointer to store the result of the separation call */ ); /** separates cuts w.r.t. given solution from a cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPseparateSolCutpool( SCIP* scip, /**< SCIP data structure */ SCIP_CUTPOOL* cutpool, /**< cut pool */ SCIP_SOL* sol, /**< solution to be separated */ SCIP_RESULT* result /**< pointer to store the result of the separation call */ ); /** if not already existing, adds row to the delayed global cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is the stages \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPaddDelayedPoolCut( SCIP* scip, /**< SCIP data structure */ SCIP_ROW* row /**< cutting plane to add */ ); /** removes the row from the delayed global cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is the stages \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPdelDelayedPoolCut( SCIP* scip, /**< SCIP data structure */ SCIP_ROW* row /**< cutting plane to add */ ); /** gets current cuts in the delayed global cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is the stages \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_CUT** SCIPgetDelayedPoolCuts( SCIP* scip /**< SCIP data structure */ ); /** gets current number of rows in the delayed global cut pool * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is the stages \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT int SCIPgetNDelayedPoolCuts( SCIP* scip /**< SCIP data structure */ ); /** gets the delayed global cut pool used by SCIP * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is the stages \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_CUTPOOL* SCIPgetDelayedGlobalCutpool( SCIP* scip /**< SCIP data structure */ ); /** separates the given primal solution or the current LP solution by calling the separators and constraint handlers' * separation methods; * the generated cuts are stored in the separation storage and can be accessed with the methods SCIPgetCuts() and * SCIPgetNCuts(); * after evaluating the cuts, you have to call SCIPclearCuts() in order to remove the cuts from the * separation storage; * it is possible to call SCIPseparateSol() multiple times with different solutions and evaluate the found cuts * afterwards * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPseparateSol( SCIP* scip, /**< SCIP data structure */ SCIP_SOL* sol, /**< primal solution that should be separated, or NULL for LP solution */ SCIP_Bool pretendroot, /**< should the cut separators be called as if we are at the root node? */ SCIP_Bool allowlocal, /**< should the separator be asked to separate local cuts */ SCIP_Bool onlydelayed, /**< should only separators be called that were delayed in the previous round? */ SCIP_Bool* delayed, /**< pointer to store whether a separator was delayed */ SCIP_Bool* cutoff /**< pointer to store whether the node can be cut off */ ); /** gets the array of cuts currently stored in the separation storage * * @return the array of cuts currently stored in the separation storage * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_PRESOLVED * - \ref SCIP_STAGE_SOLVING * - \ref SCIP_STAGE_SOLVED */ SCIP_EXPORT SCIP_ROW** SCIPgetCuts( SCIP* scip /**< SCIP data structure */ ); /** get current number of cuts in the separation storage * * @return the current number of cuts in the separation storage * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_PRESOLVED * - \ref SCIP_STAGE_SOLVING * - \ref SCIP_STAGE_SOLVED */ SCIP_EXPORT int SCIPgetNCuts( SCIP* scip /**< SCIP data structure */ ); /** clears the separation storage * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPclearCuts( SCIP* scip /**< SCIP data structure */ ); /** removes cuts that are inefficacious w.r.t. the current LP solution from separation storage without adding the cuts to the LP * * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes. * * @pre This method can be called if @p scip is in one of the following stages: * - \ref SCIP_STAGE_SOLVING */ SCIP_EXPORT SCIP_RETCODE SCIPremoveInefficaciousCuts( SCIP* scip /**< SCIP data structure */ ); /**@} */ #ifdef __cplusplus } #endif #endif