Merge branch 'max-rounds-for-papilo' into 'v9-minor'

3682: introduce new parameter to control the rounds of papilo

See merge request integer/scip!3339

CHANGELOG

@@ -30,6 +30,7 @@ Interface changes
 
 - limits/primal to terminate the solve as soon as the primal bound is at least as good as this value, same as limits/objectivestop (deprecated)
 - limits/dual to terminate the solve as soon as the dual bound is at least as good as this value
+- presolving/milp/internalmaxrounds to control the maximal rounds for each call of the milp presolver (PaPILO)
 
 ### New data structures
 

src/scip/presol_milp.cpp

@@ -87,19 +87,20 @@ SCIP_RETCODE SCIPincludePresolMILP(
 #include "papilo/core/ProblemBuilder.hpp"
 #include "papilo/Config.hpp"
 
-#define PRESOL_NAME            "milp"
-#define PRESOL_DESC            "MILP specific presolving methods"
-#define PRESOL_PRIORITY        9999999 /**< priority of the presolver (>= 0: before, < 0: after constraint handlers); combined with propagators */
-#define PRESOL_MAXROUNDS             -1 /**< maximal number of presolving rounds the presolver participates in (-1: no limit) */
-#define PRESOL_TIMING           SCIP_PRESOLTIMING_MEDIUM /* timing of the presolver (fast, medium, or exhaustive) */
+#define PRESOL_NAME                "milp"
+#define PRESOL_DESC                "MILP specific presolving methods"
+#define PRESOL_PRIORITY            9999999   /**< priority of the presolver (>= 0: before, < 0: after constraint handlers); combined with propagators */
+#define PRESOL_MAXROUNDS           -1        /**< maximal number of presolving rounds the presolver participates in (-1: no limit) */
+#define PRESOL_TIMING              SCIP_PRESOLTIMING_MEDIUM /* timing of the presolver (fast, medium, or exhaustive) */
 
 /* default parameter values */
 #define DEFAULT_THREADS            1         /**< maximum number of threads presolving may use (0: automatic) */
 #define DEFAULT_MAXFILLINPERSUBST  3         /**< maximal possible fillin for substitutions to be considered */
 #define DEFAULT_MAXSHIFTPERROW     10        /**< maximal amount of nonzeros allowed to be shifted to make space for substitutions */
 #define DEFAULT_DETECTLINDEP       0         /**< should linear dependent equations and free columns be removed? (0: never, 1: for LPs, 2: always) */
-#define DEFAULT_MAXBADGESIZE_SEQ   15000     /**< the max badge size in Probing if PaPILO is executed in sequential mode*/
-#define DEFAULT_MAXBADGESIZE_PAR   -1        /**< the max badge size in Probing if PaPILO is executed in parallel mode*/
+#define DEFAULT_MAXBADGESIZE_SEQ   15000     /**< the max badge size in Probing if PaPILO is executed in sequential mode */
+#define DEFAULT_MAXBADGESIZE_PAR   -1        /**< the max badge size in Probing if PaPILO is executed in parallel mode */
+#define DEFAULT_INTERNAL_MAXROUNDS -1        /**< internal max rounds in PaPILO (-1: no limit, 0: model cleanup) */
 #define DEFAULT_RANDOMSEED         0         /**< the random seed used for randomization of tie breaking */
 #define DEFAULT_MODIFYCONSFAC      0.8       /**< modify SCIP constraints when the number of nonzeros or rows is at most this
                                               *   factor times the number of nonzeros or rows before presolving */
@@ -125,8 +126,9 @@ struct SCIP_PresolData
    int lastnrows;                            /**< the number of rows from the last call */
    int threads;                              /**< maximum number of threads presolving may use (0: automatic) */
    int maxfillinpersubstitution;             /**< maximal possible fillin for substitutions to be considered */
-   int maxbadgesizeseq;                      /**< the max badge size in Probing if PaPILO is called in sequential mode*/
+   int maxbadgesizeseq;                      /**< the max badge size in Probing if PaPILO is called in sequential mode */
    int maxbadgesizepar;                      /**< the max badge size in Probing if PaPILO is called in parallel mode */
+   int internalmaxrounds;                    /**< internal max rounds in PaPILO (-1: no limit, 0: model cleanup) */
    int maxshiftperrow;                       /**< maximal amount of nonzeros allowed to be shifted to make space for substitutions */
    int detectlineardependency;               /**< should linear dependent equations and free columns be removed? (0: never, 1: for LPs, 2: always) */
    int randomseed;                           /**< the random seed used for randomization of tie breaking */
@@ -343,6 +345,9 @@ SCIP_DECL_PRESOLEXEC(presolExecMILP)
    presolve.getPresolveOptions().threads = 1;
 #endif
 
+#if PAPILO_VERSION_MAJOR > 2 || (PAPILO_VERSION_MAJOR == 2 && PAPILO_VERSION_MINOR >= 3)
+   presolve.getPresolveOptions().maxrounds = data->internalmaxrounds;
+#endif
 
    /* disable dual reductions that are not permitted */
    if( !complete )
@@ -936,6 +941,14 @@ SCIP_RETCODE SCIPincludePresolMILP(
    presoldata->maxbadgesizepar = DEFAULT_MAXBADGESIZE_PAR;
 #endif
 
+#if PAPILO_VERSION_MAJOR > 2 || (PAPILO_VERSION_MAJOR == 2 && PAPILO_VERSION_MINOR >= 3)
+   SCIP_CALL(SCIPaddIntParam(scip, "presolving/" PRESOL_NAME "/internalmaxrounds",
+         "internal maxrounds for each milp presolving (-1: no limit, 0: model cleanup)",
+         &presoldata->internalmaxrounds, TRUE, DEFAULT_INTERNAL_MAXROUNDS, -1, INT_MAX, NULL, NULL));
+#else
+   presoldata->internalmaxrounds = DEFAULT_INTERNAL_MAXROUNDS;
+#endif
+
    SCIP_CALL( SCIPaddBoolParam(scip,
          "presolving/" PRESOL_NAME "/enableparallelrows",
          "should the parallel rows presolver be enabled within the presolve library?",