SCIP
Solving Constraint Integer Programs
heur_scheduler.c File Reference
Detailed Description
Adaptive heuristic to schedule LNS and diving heuristics.
Definition in file heur_scheduler.c.
#include "blockmemshell/memory.h"#include "scip/cons_linear.h"#include "scip/heur_scheduler.h"#include "scip/heuristics.h"#include "scip/pub_bandit_epsgreedy.h"#include "scip/pub_bandit_exp3.h"#include "scip/pub_bandit_exp3ix.h"#include "scip/pub_bandit.h"#include "scip/pub_bandit_ucb.h"#include "scip/pub_cons.h"#include "scip/pub_event.h"#include "scip/pub_heur.h"#include "scip/pub_message.h"#include "scip/pub_misc.h"#include "scip/pub_misc_select.h"#include "scip/pub_sol.h"#include "scip/pub_var.h"#include "scip/scip_bandit.h"#include "scip/scip_branch.h"#include "scip/scip_cons.h"#include "scip/scip_copy.h"#include "scip/scip_event.h"#include "scip/scip_general.h"#include "scip/scip_heur.h"#include "scip/scip_lp.h"#include "scip/scip_mem.h"#include "scip/scip_message.h"#include "scip/scip_nodesel.h"#include "scip/scip_numerics.h"#include "scip/scip_param.h"#include "scip/scip_prob.h"#include "scip/scip_randnumgen.h"#include "scip/scip_sol.h"#include "scip/scip_solve.h"#include "scip/scip_solvingstats.h"#include "scip/scip_table.h"#include "scip/scip_timing.h"#include "scip/scip_tree.h"#include "scip/scip_var.h"#include <string.h>Go to the source code of this file.
Data Structures | |
| struct | Heur_Stats |
| struct | NH_FixingRate |
| struct | SolveFreq |
| struct | Nh |
| struct | Diving_Heur |
| struct | data_mutation |
| struct | data_crossover |
| struct | data_dins |
| struct | data_trustregion |
| struct | SolveLimits |
| struct | VarPrio |
Typedefs | |
| typedef struct data_crossover | DATA_CROSSOVER |
| typedef struct data_mutation | DATA_MUTATION |
| typedef struct data_dins | DATA_DINS |
| typedef struct data_trustregion | DATA_TRUSTREGION |
| typedef struct NH_FixingRate | NH_FIXINGRATE |
| typedef struct SolveFreq | SOLVEFREQ |
| typedef struct Heur_Stats | HEUR_STATS |
| typedef struct Nh | NH |
| typedef struct Diving_Heur | DIVING_HEUR |
| typedef struct VarPrio | VARPRIO |
| typedef enum HistIndex | HISTINDEX |
| typedef struct SolveLimits | SOLVELIMITS |
Enumerations | |
| enum | HistIndex { HIDX_OPT = 0 , HIDX_USR = 1 , HIDX_NODELIM = 2 , HIDX_STALLNODE = 3 , HIDX_INFEAS = 4 , HIDX_SOLLIM = 5 , HIDX_OTHER = 6 , HIDX_OPT = 0 , HIDX_USR = 1 , HIDX_NODELIM = 2 , HIDX_STALLNODE = 3 , HIDX_INFEAS = 4 , HIDX_SOLLIM = 5 , HIDX_OTHER = 6 } |
Functions | |
| static SCIP_RETCODE | resetFixingRate (SCIP *scip, NH_FIXINGRATE *fixingrate) |
| static void | updateFixingRateIncrement (NH_FIXINGRATE *fx) |
| static void | increaseFixingRate (NH_FIXINGRATE *fx) |
| static void | decreaseFixingRate (NH_FIXINGRATE *fx) |
| static void | updateFixingRate (NH *neighborhood, SCIP_STATUS subscipstatus, HEUR_STATS *runstats) |
| static void | resetCurrentNeighborhood (SCIP_HEURDATA *heurdata) |
| static void | resetTargetNodeLimit (SCIP_HEURDATA *heurdata) |
| static SCIP_RETCODE | heurStatsReset (SCIP *scip, HEUR_STATS *stats, SCIP_Bool usediving) |
| static SCIP_RETCODE | schedulerIncludeNeighborhood (SCIP *scip, SCIP_HEURDATA *heurdata, NH **neighborhood, const char *name, SCIP_Real minfixingrate, SCIP_Real maxfixingrate, SCIP_Bool active, int priority, DECL_VARFIXINGS((*varfixings)), DECL_CHANGESUBSCIP((*changesubscip)), DECL_NHINIT((*nhinit)), DECL_NHEXIT((*nhexit)), DECL_NHFREE((*nhfree)), DECL_NHREFSOL((*nhrefsol)), DECL_NHDEACTIVATE((*nhdeactivate))) |
| static SCIP_RETCODE | schedulerFreeNeighborhood (SCIP *scip, NH **neighborhood) |
| static SCIP_RETCODE | neighborhoodInit (SCIP *scip, NH *neighborhood) |
| static SCIP_RETCODE | neighborhoodExit (SCIP *scip, NH *neighborhood) |
| static SCIP_RETCODE | transferSolution (SCIP *subscip, SCIP_EVENTDATA *eventdata) |
| static SCIP_RETCODE | schedulerFreeDivingHeur (SCIP *scip, DIVING_HEUR **divingheur) |
| static | SCIP_DECL_EVENTEXEC (eventExecScheduler) |
| static void | initRunStats (SCIP *scip, HEUR_STATS *stats) |
| static void | updateRunStats (HEUR_STATS *stats, SCIP *subscip) |
| static int | getHistIndex (SCIP_STATUS subscipstatus) |
| static void | printNeighborhoodStatistics (SCIP *scip, SCIP_HEURDATA *heurdata, FILE *file) |
| static void | printDivingHeurStatistics (SCIP *scip, SCIP_HEURDATA *heurdata, FILE *file) |
| static void | updateHeurStatsDiving (HEUR_STATS *runstats, DIVING_HEUR *divingheur) |
| static void | updateHeurStatsLNS (HEUR_STATS *runstats, NH *neighborhood, SCIP_STATUS *subscipstatus) |
| static | SCIP_DECL_SORTINDCOMP (sortIndCompScheduler) |
| static SCIP_Real | getVariableRedcostScore (SCIP *scip, SCIP_VAR *var, SCIP_Real refsolval, SCIP_Bool uselocalredcost) |
| static SCIP_Real | getVariablePscostScore (SCIP *scip, SCIP_VAR *var, SCIP_Real refsolval, SCIP_Bool uselocallpsol) |
| static void | tryAdd2variableBuffer (SCIP *scip, SCIP_VAR *var, SCIP_Real val, SCIP_VAR **varbuf, SCIP_Real *valbuf, int *nfixings, SCIP_Bool integer) |
| static SCIP_RETCODE | LNSFixMoreVariables (SCIP *scip, SCIP_HEURDATA *heurdata, SCIP_SOL *refsol, SCIP_VAR **varbuf, SCIP_Real *valbuf, int *nfixings, int ntargetfixings, SCIP_Bool *success) |
| static SCIP_RETCODE | createBandit (SCIP *scip, SCIP_HEURDATA *heurdata, SCIP_Real *priorities, unsigned int initseed) |
| static | SCIP_DECL_HEURCOPY (heurCopyScheduler) |
| static SCIP_RETCODE | neighborhoodGetRefsol (SCIP *scip, NH *neighborhood, SCIP_SOL **solptr) |
| static SCIP_RETCODE | LNSUnfixVariables (SCIP *scip, SCIP_HEURDATA *heurdata, SCIP_VAR **varbuf, SCIP_Real *valbuf, int *nfixings, int ntargetfixings, SCIP_Bool *success) |
| static SCIP_RETCODE | neighborhoodFixVariables (SCIP *scip, SCIP_HEURDATA *heurdata, NH *neighborhood, SCIP_VAR **varbuf, SCIP_Real *valbuf, int *nfixings, SCIP_RESULT *result) |
| static SCIP_RETCODE | neighborhoodChangeSubscip (SCIP *sourcescip, SCIP *targetscip, NH *neighborhood, SCIP_VAR **targetvars, int *ndomchgs, int *nchgobjs, int *naddedconss, SCIP_Bool *success) |
| static SCIP_RETCODE | setLimits (SCIP *subscip, SOLVELIMITS *solvelimits) |
| static SCIP_RETCODE | determineLimits (SCIP *scip, SCIP_HEUR *heur, int selection, SOLVELIMITS *solvelimits, SCIP_Bool *runagain) |
| static SCIP_Real | getReward (SCIP *scip, SCIP_HEURDATA *heurdata, int selection, HEUR_STATS *runstats, SCIP_STATUS subscipstatus) |
| static SCIP_RETCODE | setupSubScip (SCIP *scip, SCIP *subscip, SCIP_VAR **subvars, SOLVELIMITS *solvelimits, SCIP_HEUR *heur, SCIP_Bool objchgd) |
| static void | initSolveFreq (SOLVEFREQ *solvefreqdata) |
| static void | updateSolveFreqIncrement (SOLVEFREQ *solvefreqdata) |
| static void | increaseSolveFreq (SOLVEFREQ *solvefreqdata) |
| static void | decreaseSolveFreq (SOLVEFREQ *solvefreqdata) |
| static void | updateSolveFreq (DIVING_HEUR *divingheur, HEUR_STATS *stats) |
| static SCIP_RETCODE | includeDivingHeurs (SCIP *scip, SCIP_HEUR *heur, SCIP_HEURDATA *heurdata) |
| static SCIP_RETCODE | selectHeuristic (SCIP *scip, SCIP_HEURDATA *heurdata, int *selection) |
| static SCIP_RETCODE | updateSelectionStrategy (SCIP *scip, SCIP_HEURDATA *heurdata, SCIP_Real reward, int selection) |
| static SCIP_RETCODE | executeDivingHeuristic (SCIP *scip, SCIP_HEUR *heur, int selection, HEUR_STATS *runstats, SCIP_RESULT *result) |
| static SCIP_RETCODE | executeLNSHeuristic (SCIP *scip, SCIP_HEUR *heur, int selection, HEUR_STATS *runstats, SCIP_STATUS *subscipstatus, SCIP_RESULT *result) |
| static SCIP_RETCODE | executeHeuristic (SCIP *scip, SCIP_HEUR *heur, int selection, HEUR_STATS *runstats, SCIP_STATUS *subscipstatus, SCIP_RESULT *result) |
| static SCIP_RETCODE | reinitBandit (SCIP *scip, SCIP_HEURDATA *heurdata, int nactions) |
| static SCIP_RETCODE | initRest (SCIP *scip, SCIP_HEUR *heur) |
| static | SCIP_DECL_HEUREXEC (heurExecScheduler) |
| static | DECL_VARFIXINGS (varFixingsRens) |
| static | DECL_CHANGESUBSCIP (changeSubscipRens) |
| static SCIP_RETCODE | fixMatchingSolutionValues (SCIP *scip, SCIP_SOL **sols, int nsols, SCIP_VAR **vars, int nvars, SCIP_VAR **varbuf, SCIP_Real *valbuf, int *nfixings) |
| static | DECL_VARFIXINGS (varFixingsRins) |
| static | DECL_NHINIT (nhInitCrossover) |
| static | DECL_NHEXIT (nhExitCrossover) |
| static | DECL_NHFREE (nhFreeCrossover) |
| static | DECL_VARFIXINGS (varFixingsCrossover) |
| static | DECL_NHREFSOL (nhRefsolCrossover) |
| static | DECL_NHINIT (nhInitMutation) |
| static | DECL_NHEXIT (nhExitMutation) |
| static | DECL_VARFIXINGS (varFixingsMutation) |
| static SCIP_RETCODE | addLocalBranchingConstraint (SCIP *sourcescip, SCIP *targetscip, SCIP_VAR **subvars, int distance, SCIP_Bool *success, int *naddedconss) |
| static | DECL_CHANGESUBSCIP (changeSubscipLocalbranching) |
| static | DECL_CHANGESUBSCIP (changeSubscipProximity) |
| static | DECL_CHANGESUBSCIP (changeSubscipZeroobjective) |
| static void | computeIntegerVariableBoundsDins (SCIP *scip, SCIP_VAR *var, SCIP_Real *lbptr, SCIP_Real *ubptr) |
| static | DECL_VARFIXINGS (varFixingsDins) |
| static | DECL_CHANGESUBSCIP (changeSubscipDins) |
| static | DECL_NHFREE (nhFreeDins) |
| static | DECL_NHFREE (nhFreeTrustregion) |
| static | DECL_CHANGESUBSCIP (changeSubscipTrustregion) |
| static | DECL_NHREFSOL (nhRefsolIncumbent) |
| static | DECL_NHDEACTIVATE (nhDeactivateDiscreteVars) |
| static | DECL_NHDEACTIVATE (nhDeactivateBinVars) |
| static | DECL_NHDEACTIVATE (nhDeactivateObjVars) |
| static SCIP_RETCODE | includeNeighborhoods (SCIP *scip, SCIP_HEURDATA *heurdata) |
| static | SCIP_DECL_HEURINIT (heurInitScheduler) |
| static | SCIP_DECL_HEURINITSOL (heurInitsolScheduler) |
| static | SCIP_DECL_HEUREXIT (heurExitScheduler) |
| static | SCIP_DECL_HEURFREE (heurFreeScheduler) |
| static | SCIP_DECL_TABLEOUTPUT (tableOutputNeighborhood) |
| SCIP_RETCODE | SCIPincludeHeurScheduler (SCIP *scip) |
Macro Definition Documentation
◆ HEUR_NAME
| #define HEUR_NAME "scheduler" |
Definition at line 76 of file heur_scheduler.c.
◆ HEUR_DESC
| #define HEUR_DESC "Adaptive heuristic to schedule LNS and diving heuristics" |
Definition at line 77 of file heur_scheduler.c.
◆ HEUR_DISPCHAR
| #define HEUR_DISPCHAR SCIP_HEURDISPCHAR_LNS |
Definition at line 78 of file heur_scheduler.c.
◆ HEUR_PRIORITY
| #define HEUR_PRIORITY -30000 |
Definition at line 79 of file heur_scheduler.c.
◆ HEUR_FREQ
| #define HEUR_FREQ -1 |
Definition at line 80 of file heur_scheduler.c.
◆ HEUR_FREQOFS
| #define HEUR_FREQOFS 0 |
Definition at line 81 of file heur_scheduler.c.
◆ HEUR_MAXDEPTH
| #define HEUR_MAXDEPTH -1 |
Definition at line 82 of file heur_scheduler.c.
◆ HEUR_TIMING
| #define HEUR_TIMING SCIP_HEURTIMING_AFTERNODE |
Definition at line 83 of file heur_scheduler.c.
◆ HEUR_USESSUBSCIP
| #define HEUR_USESSUBSCIP TRUE |
does the heuristic use a secondary SCIP instance?
Definition at line 84 of file heur_scheduler.c.
◆ NNEIGHBORHOODS
| #define NNEIGHBORHOODS 9 |
Definition at line 86 of file heur_scheduler.c.
◆ DIVINGHEURS_INITIALSIZE
| #define DIVINGHEURS_INITIALSIZE 10 |
Definition at line 87 of file heur_scheduler.c.
◆ DEFAULT_NODESQUOT
| #define DEFAULT_NODESQUOT 0.1 |
Definition at line 92 of file heur_scheduler.c.
◆ DEFAULT_NODESQUOTMIN
| #define DEFAULT_NODESQUOTMIN 0.0 |
Definition at line 93 of file heur_scheduler.c.
◆ DEFAULT_NODESOFFSET
| #define DEFAULT_NODESOFFSET 500LL |
Definition at line 94 of file heur_scheduler.c.
◆ DEFAULT_NSOLSLIM
| #define DEFAULT_NSOLSLIM 3 |
Definition at line 95 of file heur_scheduler.c.
◆ DEFAULT_MINNODES
| #define DEFAULT_MINNODES 50LL |
Definition at line 96 of file heur_scheduler.c.
◆ DEFAULT_MAXNODES
| #define DEFAULT_MAXNODES 500LL |
Definition at line 97 of file heur_scheduler.c.
◆ DEFAULT_WAITINGNODES
| #define DEFAULT_WAITINGNODES 0LL |
number of nodes since last incumbent solution that the heuristic should wait
Definition at line 98 of file heur_scheduler.c.
◆ DEFAULT_INITLNSNODELIMIT
| #define DEFAULT_INITLNSNODELIMIT 50 |
Definition at line 99 of file heur_scheduler.c.
◆ DEFAULT_INITDIVINGNODELIMIT
| #define DEFAULT_INITDIVINGNODELIMIT 500LL |
Definition at line 100 of file heur_scheduler.c.
◆ DEFAULT_TARGETNODEFACTOR
| #define DEFAULT_TARGETNODEFACTOR 1.05 |
Definition at line 101 of file heur_scheduler.c.
◆ LRATEMIN
| #define LRATEMIN 0.01 |
lower bound for learning rate for target nodes and minimum improvement
Definition at line 102 of file heur_scheduler.c.
◆ LPLIMFAC
| #define LPLIMFAC 4.0 |
Definition at line 103 of file heur_scheduler.c.
◆ DEFAULT_INITDURINGROOT
| #define DEFAULT_INITDURINGROOT FALSE |
Definition at line 104 of file heur_scheduler.c.
◆ DEFAULT_MAXCALLSSAMESOL
| #define DEFAULT_MAXCALLSSAMESOL -1 |
number of allowed executions of the heuristic on the same incumbent solution
Definition at line 105 of file heur_scheduler.c.
◆ DEFAULT_HEURTIMELIMIT
| #define DEFAULT_HEURTIMELIMIT 60.0 |
time limit for a single heuristic run
Definition at line 106 of file heur_scheduler.c.
◆ DEFAULT_BESTSOLWEIGHT
| #define DEFAULT_BESTSOLWEIGHT 1 |
Definition at line 111 of file heur_scheduler.c.
◆ DEFAULT_BANDITALGO
| #define DEFAULT_BANDITALGO 'i' |
the default bandit algorithm: (u)pper confidence bounds, (e)xp.3, epsilon (g)reedy, exp.3-(i)x
Definition at line 112 of file heur_scheduler.c.
◆ DEFAULT_RESETWEIGHTS
| #define DEFAULT_RESETWEIGHTS FALSE |
should the bandit algorithms be reset when a new problem is read?
Definition at line 113 of file heur_scheduler.c.
◆ DEFAULT_SUBSCIPRANDSEEDS
| #define DEFAULT_SUBSCIPRANDSEEDS FALSE |
should random seeds of sub-SCIPs be altered to increase diversification?
Definition at line 114 of file heur_scheduler.c.
◆ DEFAULT_FIXTOL
| #define DEFAULT_FIXTOL 0.1 |
tolerance by which the fixing rate may be missed without generic fixing
Definition at line 115 of file heur_scheduler.c.
◆ DEFAULT_UNFIXTOL
| #define DEFAULT_UNFIXTOL 0.1 |
tolerance by which the fixing rate may be exceeded without generic unfixing
Definition at line 116 of file heur_scheduler.c.
◆ DEFAULT_BETA
| #define DEFAULT_BETA 0.0 |
default reward offset between 0 and 1 at every observation for exp3
Definition at line 117 of file heur_scheduler.c.
◆ DEFAULT_NSELECTIONS
| #define DEFAULT_NSELECTIONS 5 |
number of heuristics picked by the scheduler in one call (-1: number of controlled heuristics, 0: until new incumbent is found)
Definition at line 118 of file heur_scheduler.c.
◆ DEFAULT_USEREDCOST
| #define DEFAULT_USEREDCOST TRUE |
should reduced cost scores be used for variable priorization?
Definition at line 123 of file heur_scheduler.c.
◆ DEFAULT_USEPSCOST
| #define DEFAULT_USEPSCOST TRUE |
should pseudo cost scores be used for variable priorization?
Definition at line 124 of file heur_scheduler.c.
◆ DEFAULT_USEDISTANCES
| #define DEFAULT_USEDISTANCES TRUE |
should distances from fixed variables be used for variable priorization
Definition at line 125 of file heur_scheduler.c.
◆ DEFAULT_USELOCALREDCOST
| #define DEFAULT_USELOCALREDCOST FALSE |
should local reduced costs be used for generic (un)fixing?
Definition at line 126 of file heur_scheduler.c.
◆ DEFAULT_EFFORTREWARDWEIGHT
| #define DEFAULT_EFFORTREWARDWEIGHT 0.2 |
Definition at line 131 of file heur_scheduler.c.
◆ DEFAULT_SOLREWARDWEIGHT
| #define DEFAULT_SOLREWARDWEIGHT 0.3 |
Definition at line 132 of file heur_scheduler.c.
◆ DEFAULT_QUALREWARDWEIGHT
| #define DEFAULT_QUALREWARDWEIGHT 0.3 |
Definition at line 133 of file heur_scheduler.c.
◆ DEFAULT_CONFLICTREWARDWEIGHT
| #define DEFAULT_CONFLICTREWARDWEIGHT 0.2 |
Definition at line 134 of file heur_scheduler.c.
◆ DEFAULT_EPS
| #define DEFAULT_EPS 0.4685844 |
increase exploration in epsilon-greedy bandit algorithm
Definition at line 140 of file heur_scheduler.c.
◆ DEFAULT_ALPHA
| #define DEFAULT_ALPHA 0.0016 |
parameter to increase the confidence width in UCB
Definition at line 141 of file heur_scheduler.c.
◆ DEFAULT_GAMMA
| #define DEFAULT_GAMMA 0.07041455 |
default weight between uniform (gamma ~ 1) and weight driven (gamma ~ 0) probability distribution for exp3
Definition at line 142 of file heur_scheduler.c.
◆ SOLVEFREQ_DECAY
| #define SOLVEFREQ_DECAY 0.75 |
geometric decay for solving freq adjustments
Definition at line 147 of file heur_scheduler.c.
◆ SOLVEFREQ_STARTINC
| #define SOLVEFREQ_STARTINC 0.2 |
initial increment value for solving frequency
Definition at line 148 of file heur_scheduler.c.
◆ MAXSOLVEFREQ
| #define MAXSOLVEFREQ 0.3 |
maximal solving frequency
Definition at line 149 of file heur_scheduler.c.
◆ MINSOLVEFREQ
| #define MINSOLVEFREQ 0.05 |
minimal solving frequency
Definition at line 150 of file heur_scheduler.c.
◆ FIXINGRATE_DECAY
| #define FIXINGRATE_DECAY 0.75 |
geometric decay for fixing rate adjustments
Definition at line 155 of file heur_scheduler.c.
◆ FIXINGRATE_STARTINC
| #define FIXINGRATE_STARTINC 0.2 |
initial increment value for fixing rate
Definition at line 156 of file heur_scheduler.c.
◆ DEFAULT_USESUBSCIPHEURS
| #define DEFAULT_USESUBSCIPHEURS FALSE |
should the heuristic activate other sub-SCIP heuristics during its search?
Definition at line 157 of file heur_scheduler.c.
◆ DEFAULT_COPYCUTS
| #define DEFAULT_COPYCUTS FALSE |
should cutting planes be copied to the sub-SCIP?
Definition at line 158 of file heur_scheduler.c.
◆ DEFAULT_SEED
| #define DEFAULT_SEED 113 |
Definition at line 161 of file heur_scheduler.c.
◆ MUTATIONSEED
| #define MUTATIONSEED 121 |
Definition at line 162 of file heur_scheduler.c.
◆ CROSSOVERSEED
| #define CROSSOVERSEED 321 |
Definition at line 163 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_RENS
| #define DEFAULT_MINFIXINGRATE_RENS 0.3 |
Definition at line 166 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_RENS
| #define DEFAULT_MAXFIXINGRATE_RENS 0.9 |
Definition at line 167 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_RENS
| #define DEFAULT_ACTIVE_RENS TRUE |
Definition at line 168 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_RENS
| #define DEFAULT_PRIORITY_RENS -1100000 |
Definition at line 170 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_RINS
| #define DEFAULT_MINFIXINGRATE_RINS 0.3 |
Definition at line 172 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_RINS
| #define DEFAULT_MAXFIXINGRATE_RINS 0.9 |
Definition at line 173 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_RINS
| #define DEFAULT_ACTIVE_RINS TRUE |
Definition at line 174 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_RINS
| #define DEFAULT_PRIORITY_RINS -1101000 |
Definition at line 176 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_MUTATION
| #define DEFAULT_MINFIXINGRATE_MUTATION 0.3 |
Definition at line 178 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_MUTATION
| #define DEFAULT_MAXFIXINGRATE_MUTATION 0.9 |
Definition at line 179 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_MUTATION
| #define DEFAULT_ACTIVE_MUTATION TRUE |
Definition at line 180 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_MUTATION
| #define DEFAULT_PRIORITY_MUTATION -1103010 |
Definition at line 182 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_LOCALBRANCHING
| #define DEFAULT_MINFIXINGRATE_LOCALBRANCHING 0.3 |
Definition at line 184 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_LOCALBRANCHING
| #define DEFAULT_MAXFIXINGRATE_LOCALBRANCHING 0.9 |
Definition at line 185 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_LOCALBRANCHING
| #define DEFAULT_ACTIVE_LOCALBRANCHING TRUE |
Definition at line 186 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_LOCALBRANCHING
| #define DEFAULT_PRIORITY_LOCALBRANCHING -1102000 |
Definition at line 188 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_PROXIMITY
| #define DEFAULT_MINFIXINGRATE_PROXIMITY 0.3 |
Definition at line 190 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_PROXIMITY
| #define DEFAULT_MAXFIXINGRATE_PROXIMITY 0.9 |
Definition at line 191 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_PROXIMITY
| #define DEFAULT_ACTIVE_PROXIMITY TRUE |
Definition at line 192 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_PROXIMITY
| #define DEFAULT_PRIORITY_PROXIMITY -2000000 |
Definition at line 194 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_CROSSOVER
| #define DEFAULT_MINFIXINGRATE_CROSSOVER 0.3 |
Definition at line 196 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_CROSSOVER
| #define DEFAULT_MAXFIXINGRATE_CROSSOVER 0.9 |
Definition at line 197 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_CROSSOVER
| #define DEFAULT_ACTIVE_CROSSOVER TRUE |
Definition at line 198 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_CROSSOVER
| #define DEFAULT_PRIORITY_CROSSOVER -1104000 |
Definition at line 200 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_ZEROOBJECTIVE
| #define DEFAULT_MINFIXINGRATE_ZEROOBJECTIVE 0.3 |
Definition at line 202 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_ZEROOBJECTIVE
| #define DEFAULT_MAXFIXINGRATE_ZEROOBJECTIVE 0.9 |
Definition at line 203 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_ZEROOBJECTIVE
| #define DEFAULT_ACTIVE_ZEROOBJECTIVE TRUE |
Definition at line 204 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_ZEROOBJECTIVE
| #define DEFAULT_PRIORITY_ZEROOBJECTIVE 100 |
Definition at line 206 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_DINS
| #define DEFAULT_MINFIXINGRATE_DINS 0.3 |
Definition at line 208 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_DINS
| #define DEFAULT_MAXFIXINGRATE_DINS 0.9 |
Definition at line 209 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_DINS
| #define DEFAULT_ACTIVE_DINS TRUE |
Definition at line 210 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_DINS
| #define DEFAULT_PRIORITY_DINS -1105000 |
Definition at line 212 of file heur_scheduler.c.
◆ DEFAULT_MINFIXINGRATE_TRUSTREGION
| #define DEFAULT_MINFIXINGRATE_TRUSTREGION 0.3 |
Definition at line 214 of file heur_scheduler.c.
◆ DEFAULT_MAXFIXINGRATE_TRUSTREGION
| #define DEFAULT_MAXFIXINGRATE_TRUSTREGION 0.9 |
Definition at line 215 of file heur_scheduler.c.
◆ DEFAULT_ACTIVE_TRUSTREGION
| #define DEFAULT_ACTIVE_TRUSTREGION FALSE |
Definition at line 216 of file heur_scheduler.c.
◆ DEFAULT_PRIORITY_TRUSTREGION
| #define DEFAULT_PRIORITY_TRUSTREGION -1102010 |
Definition at line 218 of file heur_scheduler.c.
◆ DEFAULT_NSOLS_CROSSOVER
| #define DEFAULT_NSOLS_CROSSOVER 2 |
parameter for the number of solutions that crossover should combine
Definition at line 221 of file heur_scheduler.c.
◆ DEFAULT_NPOOLSOLS_DINS
| #define DEFAULT_NPOOLSOLS_DINS 5 |
number of pool solutions where binary solution values must agree
Definition at line 222 of file heur_scheduler.c.
◆ DEFAULT_VIOLPENALTY_TRUSTREGION
| #define DEFAULT_VIOLPENALTY_TRUSTREGION 100.0 |
the penalty for violating the trust region
Definition at line 223 of file heur_scheduler.c.
◆ EVENTHDLR_NAME
| #define EVENTHDLR_NAME "Scheduler" |
Definition at line 226 of file heur_scheduler.c.
◆ EVENTHDLR_DESC
| #define EVENTHDLR_DESC "LP event handler for " HEUR_NAME " heuristic" |
Definition at line 227 of file heur_scheduler.c.
◆ SCIP_EVENTTYPE_SCHEDULER
| #define SCIP_EVENTTYPE_SCHEDULER (SCIP_EVENTTYPE_LPSOLVED | SCIP_EVENTTYPE_SOLFOUND | SCIP_EVENTTYPE_BESTSOLFOUND) |
Definition at line 228 of file heur_scheduler.c.
◆ TABLE_NAME_NEIGHBORHOOD
| #define TABLE_NAME_NEIGHBORHOOD "scheduler" |
Definition at line 231 of file heur_scheduler.c.
◆ TABLE_DESC_NEIGHBORHOOD
| #define TABLE_DESC_NEIGHBORHOOD "scheduler heuristics statistics" |
Definition at line 232 of file heur_scheduler.c.
◆ TABLE_POSITION_NEIGHBORHOOD
| #define TABLE_POSITION_NEIGHBORHOOD 12500 |
the position of the statistics table
Definition at line 233 of file heur_scheduler.c.
◆ TABLE_EARLIEST_STAGE_NEIGHBORHOOD
| #define TABLE_EARLIEST_STAGE_NEIGHBORHOOD SCIP_STAGE_TRANSFORMED |
output of the statistics table is only printed from this stage onwards
Definition at line 234 of file heur_scheduler.c.
◆ DECL_VARFIXINGS
| #define DECL_VARFIXINGS | ( | x | ) |
Value:
SCIP_RETCODE x ( \
NH* neighborhood, /**< neighborhood data structure */ \
SCIP_VAR** varbuf, /**< buffer array to collect variables to fix */\
SCIP_Real* valbuf, /**< buffer array to collect fixing values */ \
int* nfixings, /**< pointer to store the number of fixings */ \
SCIP_RESULT* result /**< result pointer */ \
)
Definition: objbenders.h:44
Definition: heur_alns.c:367
Definition: struct_var.h:208
Definition: struct_scip.h:70
callback to collect variable fixings of neighborhood
Definition at line 265 of file heur_scheduler.c.
◆ DECL_CHANGESUBSCIP
| #define DECL_CHANGESUBSCIP | ( | x | ) |
Value:
SCIP_RETCODE x ( \
SCIP* sourcescip, /**< source SCIP data structure */\
SCIP* targetscip, /**< target SCIP data structure */\
NH* neighborhood, /**< neighborhood data structure */\
SCIP_VAR** subvars, /**< array of targetscip variables in the same order as the source SCIP variables */\
int* ndomchgs, /**< pointer to store the number of performed domain changes */\
int* nchgobjs, /**< pointer to store the number of changed objective coefficients */ \
int* naddedconss, /**< pointer to store the number of additional constraints */\
SCIP_Bool* success /**< pointer to store if the sub-MIP was successfully adjusted */\
)
callback for subproblem changes other than variable fixings
this callback can be used to further modify the subproblem by changes other than variable fixings. Typical modifications include restrictions of variable domains, the formulation of additional constraints, or changed objective coefficients.
The callback should set the success pointer to indicate whether it was successful with its modifications or not.
Definition at line 282 of file heur_scheduler.c.
◆ DECL_NHINIT
| #define DECL_NHINIT | ( | x | ) |
Value:
optional initialization callback for neighborhoods when a new problem is read
Definition at line 294 of file heur_scheduler.c.
◆ DECL_NHEXIT
| #define DECL_NHEXIT | ( | x | ) |
Value:
deinitialization callback for neighborhoods when exiting a problem
Definition at line 300 of file heur_scheduler.c.
◆ DECL_NHFREE
| #define DECL_NHFREE | ( | x | ) |
Value:
deinitialization callback for neighborhoods before SCIP is freed
Definition at line 306 of file heur_scheduler.c.
◆ DECL_NHREFSOL
| #define DECL_NHREFSOL | ( | x | ) |
Value:
SCIP_RETCODE x ( \
NH* neighborhood, /**< neighborhood data structure */ \
SCIP_SOL** solptr, /**< pointer to store the reference solution */ \
SCIP_RESULT* result /**< pointer to indicate the callback success whether a reference solution is available */ \
)
Definition: struct_sol.h:74
callback function to return a feasible reference solution for further fixings
The reference solution should be stored in the solptr. The result pointer can be used to indicate either
- SCIP_SUCCESS or
- SCIP_DIDNOTFIND
Definition at line 319 of file heur_scheduler.c.
◆ DECL_NHDEACTIVATE
| #define DECL_NHDEACTIVATE | ( | x | ) |
Value:
SCIP_RETCODE x (\
SCIP_Bool* deactivate /**< pointer to store whether the neighborhood should be deactivated (TRUE) for an instance */ \
)
callback function to deactivate neighborhoods on problems where they are irrelevant
Definition at line 327 of file heur_scheduler.c.
◆ NHISTENTRIES
| #define NHISTENTRIES 7 |
Definition at line 344 of file heur_scheduler.c.
Typedef Documentation
◆ DATA_CROSSOVER
| typedef struct data_crossover DATA_CROSSOVER |
crossover neighborhood data structure
Definition at line 241 of file heur_scheduler.c.
◆ DATA_MUTATION
| typedef struct data_mutation DATA_MUTATION |
mutation neighborhood data structure
Definition at line 243 of file heur_scheduler.c.
◆ DATA_DINS
dins neighborhood data structure
Definition at line 245 of file heur_scheduler.c.
◆ DATA_TRUSTREGION
| typedef struct data_trustregion DATA_TRUSTREGION |
trustregion neighborhood data structure
Definition at line 247 of file heur_scheduler.c.
◆ NH_FIXINGRATE
| typedef struct NH_FixingRate NH_FIXINGRATE |
Definition at line 249 of file heur_scheduler.c.
◆ SOLVEFREQ
fixing rate data structure
Definition at line 251 of file heur_scheduler.c.
◆ HEUR_STATS
| typedef struct Heur_Stats HEUR_STATS |
diving heuristic solving frequency data structure heuristic statistics data structure
Definition at line 253 of file heur_scheduler.c.
◆ NH
neighborhood data structure
Definition at line 255 of file heur_scheduler.c.
◆ DIVING_HEUR
| typedef struct Diving_Heur DIVING_HEUR |
diving heuristic data structure
Definition at line 257 of file heur_scheduler.c.
◆ VARPRIO
Definition at line 262 of file heur_scheduler.c.
◆ HISTINDEX
Definition at line 343 of file heur_scheduler.c.
◆ SOLVELIMITS
| typedef struct SolveLimits SOLVELIMITS |
Definition at line 541 of file heur_scheduler.c.
Enumeration Type Documentation
◆ HistIndex
| enum HistIndex |
sub-SCIP status code enumerator
Definition at line 333 of file heur_scheduler.c.
Function Documentation
◆ resetFixingRate()
|
static |
Reset target fixing rate
- Parameters
-
scip SCIP data structure fixingrate heuristic fixing rate
Definition at line 562 of file heur_scheduler.c.
References FIXINGRATE_STARTINC, NH_FixingRate::increment, NH_FixingRate::maxfixingrate, NULL, SCIP_OKAY, and NH_FixingRate::targetfixingrate.
Referenced by SCIP_DECL_HEURINIT().
◆ updateFixingRateIncrement()
|
static |
update increment for fixing rate
- Parameters
-
fx fixing rate
Definition at line 579 of file heur_scheduler.c.
References FIXINGRATE_DECAY, NH_FixingRate::increment, LRATEMIN, and MAX.
Referenced by updateFixingRate().
◆ increaseFixingRate()
|
static |
increase fixing rate
decrease also the rate by which the target fixing rate is adjusted
- Parameters
-
fx fixing rate
Definition at line 592 of file heur_scheduler.c.
References NH_FixingRate::increment, NH_FixingRate::maxfixingrate, MIN, and NH_FixingRate::targetfixingrate.
Referenced by updateFixingRate().
◆ decreaseFixingRate()
|
static |
decrease fixing rate
decrease also the rate by which the target fixing rate is adjusted
- Parameters
-
fx fixing rate
Definition at line 605 of file heur_scheduler.c.
References NH_FixingRate::increment, MAX, NH_FixingRate::minfixingrate, and NH_FixingRate::targetfixingrate.
Referenced by updateFixingRate().
◆ updateFixingRate()
|
static |
update fixing rate based on the results of the current run
- Parameters
-
neighborhood neighborhood subscipstatus status of the sub-SCIP run runstats run statistics for this run
Definition at line 615 of file heur_scheduler.c.
References decreaseFixingRate(), Nh::fixingrate, increaseFixingRate(), Heur_Stats::nbestsolsfound, SCIP_STATUS_BESTSOLLIMIT, SCIP_STATUS_DUALLIMIT, SCIP_STATUS_GAPLIMIT, SCIP_STATUS_INFEASIBLE, SCIP_STATUS_INFORUNBD, SCIP_STATUS_MEMLIMIT, SCIP_STATUS_NODELIMIT, SCIP_STATUS_OPTIMAL, SCIP_STATUS_PRIMALLIMIT, SCIP_STATUS_RESTARTLIMIT, SCIP_STATUS_SOLLIMIT, SCIP_STATUS_STALLNODELIMIT, SCIP_STATUS_TERMINATE, SCIP_STATUS_TIMELIMIT, SCIP_STATUS_TOTALNODELIMIT, SCIP_STATUS_UNBOUNDED, SCIP_STATUS_UNKNOWN, SCIP_STATUS_USERINTERRUPT, and updateFixingRateIncrement().
Referenced by SCIP_DECL_HEUREXEC().
◆ resetCurrentNeighborhood()
|
static |
reset the currently active neighborhood
Definition at line 662 of file heur_scheduler.c.
References NULL.
Referenced by executeLNSHeuristic(), and SCIP_DECL_HEURINITSOL().
◆ resetTargetNodeLimit()
|
static |
reset target node limit
- Parameters
-
heurdata heuristic data
Definition at line 673 of file heur_scheduler.c.
Referenced by reinitBandit(), and SCIP_DECL_HEURINITSOL().
◆ heurStatsReset()
|
static |
Reset neighborhood statistics
- Parameters
-
scip SCIP data structure stats heuristic statistics usediving TRUE if the statistics belong to a diving heuristic
Definition at line 682 of file heur_scheduler.c.
References BMSclearMemoryArray, Heur_Stats::divingdepth, Heur_Stats::execclock, Heur_Stats::nbacktracks, Heur_Stats::nbestsolsfound, Heur_Stats::nconflicts, Heur_Stats::nfixings, NHISTENTRIES, Heur_Stats::nprobnodes, Heur_Stats::nruns, Heur_Stats::nrunsbestsol, Heur_Stats::nsolsfound, NULL, SCIP_CALL, SCIP_OKAY, SCIPresetClock(), Heur_Stats::setupclock, Heur_Stats::statushist, and Heur_Stats::usednodes.
Referenced by includeDivingHeurs(), and SCIP_DECL_HEURINIT().
◆ schedulerIncludeNeighborhood()
|
static |
create a neighborhood of the specified name and include it into the scheduler heuristic
- Parameters
-
scip SCIP data structure heurdata heuristic data of the scheduler heuristic neighborhood pointer to store the neighborhood name name for this neighborhood minfixingrate default value for minfixingrate parameter of this neighborhood maxfixingrate default value for maxfixingrate parameter of this neighborhood active default value for active parameter of this neighborhood priority priority for heuristic in rootnode
Definition at line 716 of file heur_scheduler.c.
References active, BMSduplicateMemoryArray, NULL, paramname, SCIP_ALLOC, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIPaddBoolParam(), SCIPaddRealParam(), SCIPallocBlockMemory, SCIPcreateClock(), SCIPsnprintf(), and TRUE.
Referenced by includeNeighborhoods().
◆ schedulerFreeNeighborhood()
|
static |
release all data and free neighborhood
- Parameters
-
scip SCIP data structure neighborhood pointer to neighborhood that should be freed
Definition at line 781 of file heur_scheduler.c.
References BMSfreeMemoryArray, Nh::name, NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPfreeClock(), NH_Stats::setupclock, and Nh::stats.
Referenced by SCIP_DECL_HEURFREE().
◆ neighborhoodInit()
|
static |
initialize neighborhood specific data
- Parameters
-
scip SCIP data structure neighborhood neighborhood to initialize
Definition at line 812 of file heur_scheduler.c.
References NULL, SCIP_CALL, and SCIP_OKAY.
Referenced by SCIP_DECL_HEURINIT().
◆ neighborhoodExit()
|
static |
deinitialize neighborhood specific data
- Parameters
-
scip SCIP data structure neighborhood neighborhood to initialize
Definition at line 831 of file heur_scheduler.c.
References NULL, SCIP_CALL, and SCIP_OKAY.
Referenced by SCIP_DECL_HEUREXIT().
◆ transferSolution()
|
static |
creates a new solution for the original problem by copying the solution of the subproblem
- Parameters
-
subscip SCIP data structure of the subproblem eventdata event handler data
Definition at line 849 of file heur_scheduler.c.
References FALSE, Heur_Stats::nbestsolsfound, Heur_Stats::newupperbound, Heur_Stats::nsolsfound, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPgetBestSol(), SCIPgetUpperbound(), SCIPtranslateSubSol(), SCIPtrySolFree(), and TRUE.
Referenced by SCIP_DECL_EVENTEXEC().
◆ schedulerFreeDivingHeur()
|
static |
release all data and free diving heuristic
- Parameters
-
scip SCIP data structure divingheur pointer to diving heuristic that should be freed
Definition at line 900 of file heur_scheduler.c.
References Heur_Stats::execclock, NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPfreeClock(), Heur_Stats::setupclock, Diving_Heur::solvefreqdata, and Diving_Heur::stats.
Referenced by SCIP_DECL_HEURFREE().
◆ SCIP_DECL_EVENTEXEC()
|
static |
execution callback of the event handler
transfer new solutions or interrupt the solving process manually
Definition at line 929 of file heur_scheduler.c.
References EVENTHDLR_NAME, NULL, SCIP_CALL, SCIP_EVENTTYPE_BESTSOLFOUND, SCIP_EVENTTYPE_LPSOLVED, SCIP_EVENTTYPE_SCHEDULER, SCIP_EVENTTYPE_SOLFOUND, SCIP_LONGINT_FORMAT, SCIP_OKAY, SCIPdebugMsg, SCIPeventGetType(), SCIPeventhdlrGetName(), SCIPgetNLPs(), SCIPinterruptSolve(), and transferSolution().
◆ initRunStats()
|
static |
initialize heuristic statistics before the next run
- Parameters
-
scip SCIP data structure stats run statistics
Definition at line 963 of file heur_scheduler.c.
References Heur_Stats::divingdepth, Heur_Stats::nbacktracks, Heur_Stats::nbestsolsfound, Heur_Stats::nconflicts, Heur_Stats::newupperbound, Heur_Stats::nfixings, Heur_Stats::nprobnodes, Heur_Stats::nsolsfound, Heur_Stats::oldupperbound, SCIPgetUpperbound(), and Heur_Stats::usednodes.
Referenced by SCIP_DECL_HEUREXEC().
◆ updateRunStats()
|
static |
update run stats after the sub SCIP was solved
- Parameters
-
stats run statistics subscip sub-SCIP instance, or NULL
Definition at line 982 of file heur_scheduler.c.
References NULL, SCIPgetNNodes(), SCIPisTransformed(), and Heur_Stats::usednodes.
Referenced by executeLNSHeuristic().
◆ getHistIndex()
|
static |
get the histogram index for this status
- Parameters
-
subscipstatus sub-SCIP status
Definition at line 996 of file heur_scheduler.c.
References HIDX_INFEAS, HIDX_NODELIM, HIDX_OPT, HIDX_OTHER, HIDX_SOLLIM, HIDX_STALLNODE, HIDX_USR, SCIP_STATUS_BESTSOLLIMIT, SCIP_STATUS_INFEASIBLE, SCIP_STATUS_NODELIMIT, SCIP_STATUS_OPTIMAL, SCIP_STATUS_SOLLIMIT, SCIP_STATUS_STALLNODELIMIT, and SCIP_STATUS_USERINTERRUPT.
Referenced by updateHeurStatsLNS().
◆ printNeighborhoodStatistics()
|
static |
print neighborhood statistics
- Parameters
-
scip SCIP data structure heurdata heuristic data file file handle, or NULL for standard out
Definition at line 1022 of file heur_scheduler.c.
References Nh::fixingrate, HIDX_INFEAS, HIDX_NODELIM, HIDX_OPT, HIDX_OTHER, HIDX_SOLLIM, HIDX_STALLNODE, HIDX_USR, Nh::name, NH_Stats::nbestsolsfound, NHISTENTRIES, NH_Stats::nruns, NH_Stats::nsolsfound, NULL, SCIP_LONGINT_FORMAT, SCIP_Real, SCIPgetClockTime(), SCIPgetConfidenceBoundUcb(), SCIPgetProbabilityExp3(), SCIPgetProbabilityExp3IX(), SCIPgetWeightsEpsgreedy(), SCIPinfoMessage(), NH_Stats::setupclock, Nh::stats, NH_Stats::statushist, NH_FixingRate::targetfixingrate, and NH_Stats::usednodes.
Referenced by SCIP_DECL_TABLEOUTPUT().
◆ printDivingHeurStatistics()
|
static |
print diving heuristic statistics
- Parameters
-
scip SCIP data structure heurdata heuristic data file file handle, or NULL for standard out
Definition at line 1097 of file heur_scheduler.c.
References SolveFreq::currentsolvefreq, Diving_Heur::diveset, Heur_Stats::execclock, Heur_Stats::nbestsolsfound, Diving_Heur::nodelimit, Heur_Stats::nprobnodes, Heur_Stats::nruns, Heur_Stats::nsolsfound, NULL, SCIP_LONGINT_FORMAT, SCIP_Real, SCIPdivesetGetName(), SCIPgetClockTime(), SCIPgetConfidenceBoundUcb(), SCIPgetProbabilityExp3(), SCIPgetProbabilityExp3IX(), SCIPgetWeightsEpsgreedy(), SCIPinfoMessage(), Heur_Stats::setupclock, Diving_Heur::solvefreqdata, and Diving_Heur::stats.
Referenced by SCIP_DECL_TABLEOUTPUT().
◆ updateHeurStatsDiving()
|
static |
update the statistics of the diving heuristic based on the heuristic run
- Parameters
-
runstats run statistics divingheur the selected diving heuristic or NULL if LNS was used
Definition at line 1165 of file heur_scheduler.c.
References DEFAULT_BESTSOLWEIGHT, Heur_Stats::nbacktracks, Heur_Stats::nbestsolsfound, Heur_Stats::nconflicts, Heur_Stats::nprobnodes, Heur_Stats::nruns, Heur_Stats::nrunsbestsol, Heur_Stats::nsolsfound, NULL, and Diving_Heur::stats.
Referenced by SCIP_DECL_HEUREXEC().
◆ updateHeurStatsLNS()
|
static |
update the statistics of LNS heuristic based on the heuristic run
- Parameters
-
runstats run statistics neighborhood the selected neighborhood or NULL if diving was used subscipstatus status of the sub-SCIP solve or NULL if diving was used
Definition at line 1194 of file heur_scheduler.c.
References DEFAULT_BESTSOLWEIGHT, getHistIndex(), Heur_Stats::nbestsolsfound, Heur_Stats::nruns, Heur_Stats::nrunsbestsol, Heur_Stats::nsolsfound, NULL, Nh::stats, Heur_Stats::statushist, and Heur_Stats::usednodes.
Referenced by SCIP_DECL_HEUREXEC().
◆ SCIP_DECL_SORTINDCOMP()
|
static |
sort callback for variable pointers using the ALNS variable prioritization
the variable prioritization works hierarchically as follows. A variable a has the higher priority over b iff
- variable distances should be used and a has a smaller distance than b
- variable reduced costs should be used and a has a smaller score than b
- variable pseudo costs should be used and a has a smaller score than b
- based on previously assigned random scores
- Note
- : distances are context-based. For fixing more variables, distances are initialized from the already fixed variables. For unfixing variables, distances are initialized starting from the unfixed variables
Definition at line 1237 of file heur_scheduler.c.
References VarPrio::distances, NULL, VarPrio::pscostscores, VarPrio::randscores, VarPrio::redcostscores, VarPrio::usedistances, VarPrio::usepscost, and VarPrio::useredcost.
◆ getVariableRedcostScore()
|
static |
Compute the reduced cost score for this variable in the reference solution
- Parameters
-
scip SCIP data structure var the variable for which the score should be computed refsolval solution value in reference solution uselocalredcost should local reduced costs be used for generic (un)fixing?
Definition at line 1306 of file heur_scheduler.c.
References MAX, NULL, REALABS, SCIP_LPSOLSTAT_OPTIMAL, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPgetLPSolstat(), SCIPgetVarRedcost(), SCIPhasCurrentNodeLP(), SCIPinfinity(), SCIPisDualfeasNegative(), SCIPisDualfeasPositive(), SCIPisDualfeasZero(), SCIPisFeasIntegral(), SCIPisFeasNegative(), SCIPisFeasPositive(), SCIPisInfinity(), SCIPvarGetBestRootRedcost(), SCIPvarGetBestRootSol(), SCIPvarGetLPSol(), and SCIPvarGetStatus().
Referenced by LNSFixMoreVariables(), and LNSUnfixVariables().
◆ getVariablePscostScore()
|
static |
get the pseudo cost score of this variable with respect to the reference solution
- Parameters
-
scip SCIP data structure var the variable for which the score should be computed refsolval solution value in reference solution uselocallpsol should local LP solution be used?
Definition at line 1359 of file heur_scheduler.c.
References NULL, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPgetVarPseudocostVal(), SCIPisEQ(), SCIPvarGetLPSol(), SCIPvarGetRootSol(), and SCIPvarGetStatus().
Referenced by LNSFixMoreVariables(), and LNSUnfixVariables().
◆ tryAdd2variableBuffer()
|
static |
add variable and solution value to buffer data structure for variable fixings. The method checks if the value still lies within the variable bounds. The value stays unfixed otherwise.
- Parameters
-
scip SCIP data structure var (source) SCIP variable that should be added to the buffer val fixing value for this variable varbuf variable buffer to store variables that should be fixed valbuf value buffer to store fixing values nfixings pointer to number of fixed buffer variables, will be increased by 1 integer is this an integer variable?
Definition at line 1388 of file heur_scheduler.c.
References SCIPfloor(), SCIPgetNVars(), SCIPisFeasIntegral(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), and SCIPvarIsIntegral().
Referenced by DECL_VARFIXINGS(), fixMatchingSolutionValues(), and LNSFixMoreVariables().
◆ LNSFixMoreVariables()
|
static |
fix additional variables found in feasible reference solution if the ones that the neighborhood found were not enough
use not always the best solution for the values, but a reference solution provided by the neighborhood itself
- Note
- it may happen that the target fixing rate is not completely reached. This is the case if intermediate, dual reductions render the solution values of the reference solution infeasible for the current, global variable bounds.
- Parameters
-
scip SCIP data structure heurdata heuristic data of the Scheduler neighborhood refsol feasible reference solution for more variable fixings varbuf buffer array to store variables to fix valbuf buffer array to store fixing values nfixings pointer to store the number of fixings ntargetfixings number of required target fixings success pointer to store whether the target fixings have been successfully reached
Definition at line 1426 of file heur_scheduler.c.
References b, BMSclearMemoryArray, VarPrio::distances, FALSE, getVariablePscostScore(), getVariableRedcostScore(), MIN, NULL, VarPrio::pscostscores, VarPrio::randscores, VarPrio::redcostscores, VarPrio::scip, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPbanditGetRandnumgen(), SCIPfreeBufferArray, SCIPgetSolVals(), SCIPgetVarsData(), SCIPrandomGetReal(), SCIPselectInd(), SCIPvarGetLbGlobal(), SCIPvarGetProbindex(), SCIPvarGetUbGlobal(), SCIPvariablegraphBreadthFirst(), TRUE, tryAdd2variableBuffer(), VarPrio::usedistances, VarPrio::usepscost, and VarPrio::useredcost.
Referenced by neighborhoodFixVariables().
◆ createBandit()
|
static |
create the bandit algorithm for the heuristic depending on the user parameter
- Parameters
-
scip SCIP data structure heurdata heuristic data structure priorities call priorities for active neighborhoods initseed initial random seed
Definition at line 1592 of file heur_scheduler.c.
References FALSE, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPcreateBanditEpsgreedy(), SCIPcreateBanditExp3(), SCIPcreateBanditExp3IX(), SCIPcreateBanditUcb(), and SCIPerrorMessage.
Referenced by reinitBandit(), and SCIP_DECL_HEURINITSOL().
◆ SCIP_DECL_HEURCOPY()
|
static |
copy method for primal heuristic plugins (called when SCIP copies plugins)
Definition at line 1638 of file heur_scheduler.c.
References HEUR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPheurGetName(), and SCIPincludeHeurScheduler().
◆ neighborhoodGetRefsol()
|
static |
query neighborhood for a reference solution for further fixings
- Parameters
-
scip SCIP data structure neighborhood neighborhood data structure solptr solution pointer
Definition at line 1652 of file heur_scheduler.c.
References NULL, SCIP_CALL, SCIP_DIDNOTFIND, and SCIP_OKAY.
Referenced by neighborhoodFixVariables().
◆ LNSUnfixVariables()
|
static |
unfix some of the variables because there are too many fixed
a variable is ideally unfixed if it is close to other unfixed variables and fixing it has a high reduced cost impact
- Parameters
-
scip SCIP data structure heurdata heuristic data of neighborhood varbuf buffer array to store variables to fix valbuf buffer array to store fixing values nfixings pointer to store the number of fixings ntargetfixings number of required target fixings success pointer to store whether the target fixings have been successfully reached
Definition at line 1683 of file heur_scheduler.c.
References BMSclearMemoryArray, VarPrio::distances, FALSE, getVariablePscostScore(), getVariableRedcostScore(), NULL, VarPrio::pscostscores, VarPrio::randscores, VarPrio::redcostscores, VarPrio::scip, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPbanditGetRandnumgen(), SCIPduplicateBufferArray, SCIPfreeBufferArray, SCIPgetNBinVars(), SCIPgetNIntVars(), SCIPgetNVars(), SCIPgetVars(), SCIPrandomGetReal(), SCIPselectDownInd(), SCIPvarGetProbindex(), SCIPvariablegraphBreadthFirst(), TRUE, VarPrio::usedistances, VarPrio::usepscost, and VarPrio::useredcost.
Referenced by neighborhoodFixVariables().
◆ neighborhoodFixVariables()
|
static |
call variable fixing callback for this neighborhood and orchestrate additional variable fixings, if necessary
- Parameters
-
scip SCIP data structure heurdata heuristic data of the scheduler neighborhood neighborhood neighborhood data structure varbuf buffer array to keep variables that should be fixed valbuf buffer array to keep fixing values nfixings pointer to store the number of variable fixings result pointer to store the result of the fixing operation
Definition at line 1830 of file heur_scheduler.c.
References FALSE, Nh::fixingrate, LNSFixMoreVariables(), LNSUnfixVariables(), MAX, MIN, neighborhoodGetRefsol(), NULL, SCIP_Bool, SCIP_CALL, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIPdebugMsg, SCIPgetNBinVars(), SCIPgetNIntVars(), and NH_FixingRate::targetfixingrate.
Referenced by executeLNSHeuristic().
◆ neighborhoodChangeSubscip()
|
static |
change the sub-SCIP by restricting variable domains, changing objective coefficients, or adding constraints
- Parameters
-
sourcescip source SCIP data structure targetscip target SCIP data structure neighborhood neighborhood targetvars array of target SCIP variables aligned with source SCIP variables ndomchgs pointer to store the number of variable domain changes nchgobjs pointer to store the number of changed objective coefficients naddedconss pointer to store the number of added constraints success pointer to store whether the sub-SCIP has been successfully modified
Definition at line 1927 of file heur_scheduler.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, and TRUE.
Referenced by executeLNSHeuristic().
◆ setLimits()
|
static |
set sub-SCIP solving limits
- Parameters
-
subscip SCIP data structure solvelimits pointer to solving limits data structure
Definition at line 1967 of file heur_scheduler.c.
References SolveLimits::memorylimit, SolveLimits::nodelimit, NULL, SCIP_CALL, SCIP_OKAY, SCIPsetLongintParam(), SCIPsetRealParam(), SolveLimits::stallnodes, and SolveLimits::timelimit.
Referenced by setupSubScip().
◆ determineLimits()
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static |
determine limits for a sub-SCIP
- Parameters
-
scip SCIP data structure heur this heuristic selection index of selected neighborhood solvelimits pointer to solving limits data structure runagain can we solve another sub-SCIP with these limits
Definition at line 1987 of file heur_scheduler.c.
References FALSE, SolveLimits::memorylimit, SolveLimits::nodelimit, NULL, SCIP_Bool, SCIP_CALL, SCIP_Longint, SCIP_OKAY, SCIPdebugMsg, SCIPgetBoolParam(), SCIPgetMemExternEstim(), SCIPgetMemUsed(), SCIPgetRealParam(), SCIPheurGetData(), SCIPisInfinity(), SolveLimits::stallnodes, and SolveLimits::timelimit.
Referenced by executeLNSHeuristic().
◆ getReward()
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static |
Calculate reward based on the selected reward measure
- Parameters
-
scip SCIP data structure heurdata heuristic data of the scheduler neighborhood selection index of selected heuristic runstats run statistics subscipstatus status of the sub-SCIP if LNS was used
Definition at line 2034 of file heur_scheduler.c.
References Heur_Stats::divingdepth, MIN, Heur_Stats::nbestsolsfound, Heur_Stats::nconflicts, Heur_Stats::newupperbound, Heur_Stats::oldupperbound, SCIP_Real, SCIP_STATUS_TIMELIMIT, SCIPgetLowerbound(), SCIPisEQ(), SCIPisInfinity(), and Heur_Stats::usednodes.
Referenced by SCIP_DECL_HEUREXEC().
◆ setupSubScip()
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static |
set up the sub-SCIP parameters, objective cutoff, and solution limits
- Parameters
-
scip SCIP data structure subscip sub-SCIP data structure subvars array of sub-SCIP variables in the order of the main SCIP solvelimits pointer to solving limits data structure heur this heuristic objchgd did the objective change between the source and the target SCIP?
Definition at line 2112 of file heur_scheduler.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIP_PARAMSETTING_FAST, SCIP_PARAMSETTING_OFF, SCIP_Real, SCIPaddCoefLinear(), SCIPaddCons(), SCIPcreateConsLinear(), SCIPfindBranchrule(), SCIPfindNodesel(), SCIPgetNVars(), SCIPgetUpperbound(), SCIPgetVars(), SCIPheurGetData(), SCIPheurGetNCalls(), SCIPinfinity(), SCIPisFeasZero(), SCIPisInfinity(), SCIPisParamFixed(), SCIPreleaseCons(), SCIPsetBoolParam(), SCIPsetCharParam(), SCIPsetIntParam(), SCIPsetObjlimit(), SCIPsetPresolving(), SCIPsetSeparating(), SCIPsetSubscipsOff(), SCIPsumepsilon(), SCIPvarGetObj(), setLimits(), and TRUE.
Referenced by executeLNSHeuristic().
◆ initSolveFreq()
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static |
initialize solving frequency
- Parameters
-
solvefreqdata diving heuristic solving freq data
Definition at line 2236 of file heur_scheduler.c.
References SolveFreq::currentsolvefreq, SolveFreq::increment, MAXSOLVEFREQ, SolveFreq::maxsolvefreq, MINSOLVEFREQ, SolveFreq::minsolvefreq, NULL, and SOLVEFREQ_STARTINC.
Referenced by includeDivingHeurs().
◆ updateSolveFreqIncrement()
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static |
update increment for solving frequency
- Parameters
-
solvefreqdata diving heuristic solving freq data
Definition at line 2253 of file heur_scheduler.c.
References SolveFreq::increment, LRATEMIN, MAX, and SOLVEFREQ_DECAY.
Referenced by updateSolveFreq().
◆ increaseSolveFreq()
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static |
increase solving frequency
decrease also the rate by which the solving frequency is adjusted
- Parameters
-
solvefreqdata diving heuristic solving freq data
Definition at line 2266 of file heur_scheduler.c.
References SolveFreq::currentsolvefreq, SolveFreq::increment, SolveFreq::maxsolvefreq, and MIN.
Referenced by updateSolveFreq().
◆ decreaseSolveFreq()
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static |
decrease solving frequency
decrease also the rate by which the solving frequency is adjusted
- Parameters
-
solvefreqdata diving heuristic solving freq data
Definition at line 2279 of file heur_scheduler.c.
References SolveFreq::currentsolvefreq, SolveFreq::increment, MAX, and SolveFreq::minsolvefreq.
Referenced by updateSolveFreq().
◆ updateSolveFreq()
|
static |
update solve frequency for diving heuristics
- Parameters
-
divingheur diving heuristic stats run statistics for this run
Definition at line 2289 of file heur_scheduler.c.
References decreaseSolveFreq(), increaseSolveFreq(), Diving_Heur::nodelimit, Heur_Stats::nprobnodes, Heur_Stats::nsolsfound, Diving_Heur::solvefreqdata, and updateSolveFreqIncrement().
Referenced by SCIP_DECL_HEUREXEC().
◆ includeDivingHeurs()
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static |
find publicly available divesets and store them
- Parameters
-
scip SCIP data structure heur the heuristic heurdata heuristic data
Definition at line 2305 of file heur_scheduler.c.
References Diving_Heur::diveset, DIVINGHEURS_INITIALSIZE, Heur_Stats::execclock, h, heurStatsReset(), initSolveFreq(), Diving_Heur::nodelimit, NULL, Diving_Heur::priority, Diving_Heur::rootnodepriority, SCIP_CALL, SCIP_OKAY, SCIPallocBlockMemory, SCIPallocBlockMemoryArray, SCIPcreateClock(), SCIPdebugMsg, SCIPdivesetGetName(), SCIPdivesetIsPublic(), SCIPgetHeurs(), SCIPgetNHeurs(), SCIPheurGetDivesets(), SCIPheurGetNDivesets(), SCIPheurGetPriority(), SCIPreallocBlockMemoryArray, Heur_Stats::setupclock, Diving_Heur::solvefreqdata, Diving_Heur::stats, and TRUE.
Referenced by initRest().
◆ selectHeuristic()
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static |
select a heuristic depending on the selected bandit algorithm
- Parameters
-
scip SCIP data structure heurdata heuristic data of the scheduler heuristic selection pointer to store the selected heuristic index
Definition at line 2378 of file heur_scheduler.c.
References NULL, SCIP_CALL, SCIP_OKAY, and SCIPbanditSelect().
Referenced by SCIP_DECL_HEUREXEC().
◆ updateSelectionStrategy()
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static |
update selection strategy with observed reward for future draws
- Parameters
-
scip SCIP data structure heurdata heuristic data of the scheduler heuristic reward measured reward selection the heuristic index that was chosen
Definition at line 2414 of file heur_scheduler.c.
References NULL, SCIP_CALL, SCIP_OKAY, SCIPbanditUpdate(), and SCIPdebugMsg.
Referenced by SCIP_DECL_HEUREXEC().
◆ executeDivingHeuristic()
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static |
execute diving heuristic
- Parameters
-
scip SCIP data structure heur scheduler heuristic selection the heuristic index that was chosen runstats statistics of the call to selection result pointer to store the result of the heuristic call
Definition at line 2438 of file heur_scheduler.c.
References SolveFreq::currentsolvefreq, Diving_Heur::diveset, Heur_Stats::execclock, FALSE, MAX, Heur_Stats::nbacktracks, Heur_Stats::nbestsolsfound, Heur_Stats::nconflicts, Heur_Stats::newupperbound, Diving_Heur::nodelimit, Heur_Stats::nprobnodes, Heur_Stats::nsolsfound, NULL, Heur_Stats::oldupperbound, SCIP_CALL, SCIP_DIVECONTEXT_SCHEDULER, SCIP_OKAY, SCIPdebugMsg, SCIPdivesetGetName(), SCIPdivesetGetNBacktracks(), SCIPdivesetGetNConflicts(), SCIPdivesetGetNProbingNodes(), SCIPdivesetGetNSols(), SCIPgetBestSol(), SCIPgetNBestSolsFound(), SCIPgetNSols(), SCIPgetUpperbound(), SCIPheurGetData(), SCIPperformGenericDivingAlgorithm(), SCIPsolIsOriginal(), SCIPstartClock(), SCIPstopClock(), SCIP_Diveset::sol, and Diving_Heur::solvefreqdata.
Referenced by executeHeuristic().
◆ executeLNSHeuristic()
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static |
execute LNS heuristic
- Parameters
-
scip SCIP data structure heur scheduler heuristic selection the heuristic index that was chosen runstats statistics of the call to selection subscipstatus pointer to store status of the sub-SCIP solve result pointer to store the result of the heuristic call
Definition at line 2510 of file heur_scheduler.c.
References determineLimits(), EVENTHDLR_DESC, EVENTHDLR_NAME, FALSE, Nh::name, Heur_Stats::nbestsolsfound, neighborhoodChangeSubscip(), neighborhoodFixVariables(), NH_Stats::nfixings, Heur_Stats::nfixings, SolveLimits::nodelimit, NH_Stats::nruns, Heur_Stats::nsolsfound, NULL, Heur_Stats::oldupperbound, resetCurrentNeighborhood(), SCIP_Bool, SCIP_CALL, SCIP_CALL_ABORT, SCIP_DELAYED, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_EVENTTYPE_SCHEDULER, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_STATUS_UNKNOWN, SCIP_SUCCESS, SCIPABORT, SCIPallocBufferArray, SCIPblkmem(), SCIPcatchEvent(), SCIPcopyLargeNeighborhoodSearch(), SCIPcreate(), SCIPdebugMsg, SCIPfree(), SCIPfreeBufferArray, SCIPgetStatus(), SCIPgetUpperbound(), SCIPgetVarsData(), SCIPhashmapCreate(), SCIPhashmapFree(), SCIPhashmapGetImage(), SCIPheurGetData(), SCIPincludeEventhdlrBasic(), SCIPpresolve(), SCIPprintStatistics(), SCIPsnprintf(), SCIPsolve(), SCIPstartClock(), SCIPstopClock(), SCIPtransformProb(), SCIPwarningMessage(), NH_Stats::setupclock, setupSubScip(), Nh::stats, TRUE, updateRunStats(), and Heur_Stats::usednodes.
Referenced by executeHeuristic().
◆ executeHeuristic()
|
static |
execute selected heuristic
- Parameters
-
scip SCIP data structure heur scheduler heuristic selection the heuristic index that was chosen runstats statistics of call to selection subscipstatus pointer to store status of the sub-SCIP solve or NULL if diving was used result pointer to store the result of the heuristic call
Definition at line 2701 of file heur_scheduler.c.
References executeDivingHeuristic(), executeLNSHeuristic(), NULL, SCIP_CALL, SCIP_OKAY, and SCIPheurGetData().
Referenced by SCIP_DECL_HEUREXEC().
◆ reinitBandit()
|
static |
reinitialize bandit algorithm since the number of actions has changed
- Parameters
-
scip SCIP data structure heurdata heuristic data nactions new number of actions
Definition at line 2733 of file heur_scheduler.c.
References createBandit(), NULL, resetTargetNodeLimit(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPfreeBandit(), SCIPfreeBufferArray, and SCIPgetNVars().
Referenced by initRest().
◆ initRest()
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static |
initializes everything that was missing because diving heuristics were not proccessed by SCIP yet. In particular, the function adds diving heuristics to heurdata, heurdata->maxdivingnodelimit, heurdata->maxlnsnodelimit and heurdata->sortedindices if heurdata->defaultroot is set to TRUE
- Parameters
-
scip SCIP data structure heur scheduler heuristic
Definition at line 2775 of file heur_scheduler.c.
References includeDivingHeurs(), reinitBandit(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBlockMemoryArray, SCIPallocBufferArray, SCIPfreeBufferArray, SCIPheurGetData(), and SCIPsortRealInt().
Referenced by SCIP_DECL_HEUREXEC().
◆ SCIP_DECL_HEUREXEC()
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static |
execution method of primal heuristic
Definition at line 2834 of file heur_scheduler.c.
References executeHeuristic(), FALSE, getReward(), HEUR_NAME, initRest(), initRunStats(), Heur_Stats::nbestsolsfound, NULL, SCIP_Bool, SCIP_CALL, SCIP_DELAYED, SCIP_DIDNOTRUN, SCIP_Longint, SCIP_LONGINT_FORMAT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIP_STATUS_UNKNOWN, SCIPallocBuffer, SCIPdebugMsg, SCIPfreeBuffer, SCIPgetBestSol(), SCIPgetCutoffbound(), SCIPgetDepth(), SCIPgetLPObjval(), SCIPgetLPSolstat(), SCIPgetNNodes(), SCIPgetNSols(), SCIPhasCurrentNodeLP(), SCIPheurGetData(), SCIPheurGetName(), SCIPheurGetNCalls(), SCIPisGE(), SCIPisLPSolBasic(), SCIPsolGetNodenum(), selectHeuristic(), TRUE, updateFixingRate(), updateHeurStatsDiving(), updateHeurStatsLNS(), updateSelectionStrategy(), and updateSolveFreq().
◆ DECL_VARFIXINGS() [1/5]
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static |
callback to collect variable fixings of RENS
Definition at line 2985 of file heur_scheduler.c.
References Nh::fixingrate, MIN, NULL, SCIP_CALL, SCIP_DELAYED, SCIP_DIDNOTRUN, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIPallocBufferArray, SCIPfrac(), SCIPfreeBufferArray, SCIPgetLPSolstat(), SCIPgetVarsData(), SCIPhasCurrentNodeLP(), SCIPisFeasIntegral(), SCIPround(), SCIPsortDownRealInt(), SCIPvarGetLPSol(), SCIPvarIsBinary(), SCIPvarIsIntegral(), NH_FixingRate::targetfixingrate, TRUE, and tryAdd2variableBuffer().
◆ DECL_CHANGESUBSCIP() [1/6]
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static |
callback for RENS subproblem changes
Definition at line 3061 of file heur_scheduler.c.
References NULL, SCIP_CALL, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIPchgVarLbGlobal(), SCIPchgVarUbGlobal(), SCIPfloor(), SCIPgetLPSolstat(), SCIPgetSolVal(), SCIPgetVarsData(), SCIPhasCurrentNodeLP(), SCIPisFeasIntegral(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), and TRUE.
◆ fixMatchingSolutionValues()
|
static |
collect fixings by matching solution values in a collection of solutions for all binary and integer variables, or for a custom set of variables
- Parameters
-
scip SCIP data structure sols array of 2 or more solutions. It is okay for the array to contain one element equal to NULL to represent the current LP solution nsols number of solutions in the array vars variable array for which solution values must agree nvars number of variables, or -1 for all binary and integer variables varbuf buffer storage for variable fixings valbuf buffer storage for fixing values nfixings pointer to store the number of fixings
Definition at line 3107 of file heur_scheduler.c.
References NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPgetNBinVars(), SCIPgetSolVal(), SCIPgetVarsData(), SCIPisEQ(), SCIPvarIsBinary(), SCIPvarIsIntegral(), TRUE, and tryAdd2variableBuffer().
Referenced by DECL_VARFIXINGS().
◆ DECL_VARFIXINGS() [2/5]
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static |
callback to collect variable fixings of RINS
Definition at line 3173 of file heur_scheduler.c.
References fixMatchingSolutionValues(), NULL, SCIP_CALL, SCIP_DELAYED, SCIP_DIDNOTRUN, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_SOLORIGIN_ORIGINAL, SCIP_SUCCESS, SCIPgetBestSol(), SCIPgetLPSolstat(), SCIPgetVarsData(), SCIPhasCurrentNodeLP(), and SCIPsolGetOrigin().
◆ DECL_NHINIT() [1/2]
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static |
initialization callback for crossover when a new problem is read
Definition at line 3221 of file heur_scheduler.c.
References Nh::crossover, CROSSOVERSEED, Nh::data, NULL, data_crossover::rng, SCIP_CALL, SCIP_OKAY, SCIPcreateRandom(), SCIPfreeRandom(), SCIPgetNVars(), data_crossover::selsol, and TRUE.
◆ DECL_NHEXIT() [1/2]
|
static |
deinitialization callback for crossover when exiting a problem
Definition at line 3240 of file heur_scheduler.c.
References Nh::crossover, Nh::data, NULL, data_crossover::rng, SCIP_OKAY, and SCIPfreeRandom().
◆ DECL_NHFREE() [1/3]
|
static |
deinitialization callback for crossover before SCIP is freed
Definition at line 3255 of file heur_scheduler.c.
References Nh::crossover, Nh::data, NULL, SCIP_OKAY, and SCIPfreeBlockMemory.
◆ DECL_VARFIXINGS() [3/5]
|
static |
callback to collect variable fixings of crossover
Definition at line 3265 of file heur_scheduler.c.
References Nh::crossover, Nh::data, fixMatchingSolutionValues(), data_crossover::nsols, NULL, data_crossover::rng, SCIP_CALL, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_SUCCESS, SCIPallocBufferArray, SCIPfreeBufferArray, SCIPgetNBinVars(), SCIPgetNIntVars(), SCIPgetNSols(), SCIPgetSols(), SCIPrandomGetInt(), and data_crossover::selsol.
◆ DECL_NHREFSOL() [1/2]
|
static |
callback for crossover reference solution
Definition at line 3346 of file heur_scheduler.c.
References Nh::crossover, Nh::data, NULL, SCIP_DIDNOTFIND, SCIP_OKAY, SCIP_SUCCESS, and data_crossover::selsol.
◆ DECL_NHINIT() [2/2]
|
static |
initialization callback for mutation when a new problem is read
Definition at line 3367 of file heur_scheduler.c.
References Nh::data, Nh::mutation, MUTATIONSEED, NULL, data_mutation::rng, SCIP_CALL, SCIP_OKAY, SCIPallocBlockMemory, SCIPcreateRandom(), SCIPgetNVars(), and TRUE.
◆ DECL_NHEXIT() [2/2]
|
static |
deinitialization callback for mutation when exiting a problem
Definition at line 3385 of file heur_scheduler.c.
References Nh::data, Nh::mutation, NULL, data_mutation::rng, SCIP_OKAY, SCIPfreeBlockMemory, and SCIPfreeRandom().
◆ DECL_VARFIXINGS() [4/5]
|
static |
callback to collect variable fixings of mutation
Definition at line 3402 of file heur_scheduler.c.
References Nh::data, Nh::fixingrate, Nh::mutation, NULL, data_mutation::rng, SCIP_CALL, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIPduplicateBufferArray, SCIPfreeBufferArray, SCIPgetBestSol(), SCIPgetSolVal(), SCIPgetVarsData(), SCIPrandomGetInt(), SCIPswapPointers(), NH_FixingRate::targetfixingrate, TRUE, and tryAdd2variableBuffer().
◆ addLocalBranchingConstraint()
|
static |
add local branching constraint
- Parameters
-
sourcescip source SCIP data structure targetscip target SCIP data structure subvars array of sub SCIP variables in same order as source SCIP variables distance right hand side of the local branching constraint success pointer to store of a local branching constraint has been successfully added naddedconss pointer to increase the number of added constraints
Definition at line 3480 of file heur_scheduler.c.
References FALSE, MAX, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddCons(), SCIPallocBufferArray, SCIPcreateConsBasicLinear(), SCIPfreeBufferArray, SCIPgetBestSol(), SCIPgetNBinVars(), SCIPgetSolVal(), SCIPgetVars(), SCIPinfinity(), SCIPisEQ(), SCIPreleaseCons(), and TRUE.
Referenced by DECL_CHANGESUBSCIP().
◆ DECL_CHANGESUBSCIP() [2/6]
|
static |
callback for local branching subproblem changes
Definition at line 3546 of file heur_scheduler.c.
References addLocalBranchingConstraint(), SCIP_CALL, SCIP_OKAY, and SCIPgetNBinVars().
◆ DECL_CHANGESUBSCIP() [3/6]
|
static |
callback for proximity subproblem changes
Definition at line 3556 of file heur_scheduler.c.
References NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPchgVarObj(), SCIPgetBestSol(), SCIPgetSolVal(), SCIPgetVarsData(), and TRUE.
◆ DECL_CHANGESUBSCIP() [4/6]
|
static |
callback for zeroobjective subproblem changes
Definition at line 3608 of file heur_scheduler.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPchgVarObj(), SCIPconshdlrGetNActiveConss(), SCIPfindConshdlr(), SCIPgetNObjVars(), SCIPgetVarsData(), and TRUE.
◆ computeIntegerVariableBoundsDins()
|
static |
compute tightened bounds for integer variables depending on how much the LP and the incumbent solution values differ
- Parameters
-
scip SCIP data structure of the original problem var the variable for which bounds should be computed lbptr pointer to store the lower bound in the DINS sub-SCIP ubptr pointer to store the upper bound in the DINS sub-SCIP
Definition at line 3648 of file heur_scheduler.c.
References MAX, MIN, REALABS, SCIP_Real, SCIP_VARTYPE_INTEGER, SCIPfeasCeil(), SCIPfeasFloor(), SCIPgetBestSol(), SCIPgetSolVal(), SCIPisFeasEQ(), SCIPvarGetLbGlobal(), SCIPvarGetLPSol(), SCIPvarGetType(), and SCIPvarGetUbGlobal().
Referenced by DECL_CHANGESUBSCIP(), and DECL_VARFIXINGS().
◆ DECL_VARFIXINGS() [5/5]
|
static |
callback to collect variable fixings of DINS
Definition at line 3722 of file heur_scheduler.c.
References BMScopyMemoryArray, computeIntegerVariableBoundsDins(), Nh::data, Nh::dins, fixMatchingSolutionValues(), MIN, data_dins::npoolsols, NULL, SCIP_CALL, SCIP_DELAYED, SCIP_DIDNOTRUN, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIPallocBufferArray, SCIPcreateSol(), SCIPfreeBufferArray, SCIPfreeSol(), SCIPgetLPSolstat(), SCIPgetNSols(), SCIPgetSols(), SCIPgetVarsData(), SCIPisFeasIntegral(), SCIPsetSolVal(), SCIPvarGetRootSol(), TRUE, and tryAdd2variableBuffer().
◆ DECL_CHANGESUBSCIP() [5/6]
|
static |
callback for DINS subproblem changes
Definition at line 3803 of file heur_scheduler.c.
References addLocalBranchingConstraint(), computeIntegerVariableBoundsDins(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPchgVarLbGlobal(), SCIPchgVarUbGlobal(), SCIPgetNBinVars(), SCIPgetVarsData(), and TRUE.
◆ DECL_NHFREE() [2/3]
|
static |
deinitialization callback for DINS before SCIP is freed
Definition at line 3839 of file heur_scheduler.c.
References Nh::data, Nh::dins, NULL, SCIP_OKAY, and SCIPfreeBlockMemory.
◆ DECL_NHFREE() [3/3]
|
static |
deinitialization callback for trustregion before SCIP is freed
Definition at line 3850 of file heur_scheduler.c.
References Nh::data, NULL, SCIP_OKAY, SCIPfreeBlockMemory, and Nh::trustregion.
◆ DECL_CHANGESUBSCIP() [6/6]
|
static |
add trust region neighborhood constraint and auxiliary objective variable
Definition at line 3861 of file heur_scheduler.c.
References Nh::data, SCIP_CALL, SCIP_OKAY, SCIPaddTrustregionNeighborhoodConstraint(), Nh::trustregion, and data_trustregion::violpenalty.
◆ DECL_NHREFSOL() [2/2]
|
static |
callback that returns the incumbent solution as a reference point
Definition at line 3880 of file heur_scheduler.c.
References NULL, SCIP_DIDNOTFIND, SCIP_OKAY, SCIP_SUCCESS, and SCIPgetBestSol().
◆ DECL_NHDEACTIVATE() [1/3]
|
static |
callback function that deactivates a neighborhood on problems with no discrete variables
Definition at line 3900 of file heur_scheduler.c.
References NULL, SCIP_OKAY, SCIPgetNBinVars(), and SCIPgetNIntVars().
◆ DECL_NHDEACTIVATE() [2/3]
|
static |
callback function that deactivates a neighborhood on problems with no binary variables
Definition at line 3913 of file heur_scheduler.c.
References NULL, SCIP_OKAY, and SCIPgetNBinVars().
◆ DECL_NHDEACTIVATE() [3/3]
|
static |
callback function that deactivates a neighborhood on problems with no objective variables
Definition at line 3926 of file heur_scheduler.c.
References NULL, SCIP_OKAY, and SCIPgetNObjVars().
◆ includeNeighborhoods()
|
static |
include all neighborhoods
- Parameters
-
scip SCIP data structure heurdata heuristic data of the scheduler heuristic
Definition at line 3940 of file heur_scheduler.c.
References Nh::crossover, Nh::data, DEFAULT_ACTIVE_CROSSOVER, DEFAULT_ACTIVE_DINS, DEFAULT_ACTIVE_LOCALBRANCHING, DEFAULT_ACTIVE_MUTATION, DEFAULT_ACTIVE_PROXIMITY, DEFAULT_ACTIVE_RENS, DEFAULT_ACTIVE_RINS, DEFAULT_ACTIVE_TRUSTREGION, DEFAULT_ACTIVE_ZEROOBJECTIVE, DEFAULT_MAXFIXINGRATE_CROSSOVER, DEFAULT_MAXFIXINGRATE_DINS, DEFAULT_MAXFIXINGRATE_LOCALBRANCHING, DEFAULT_MAXFIXINGRATE_MUTATION, DEFAULT_MAXFIXINGRATE_PROXIMITY, DEFAULT_MAXFIXINGRATE_RENS, DEFAULT_MAXFIXINGRATE_RINS, DEFAULT_MAXFIXINGRATE_TRUSTREGION, DEFAULT_MAXFIXINGRATE_ZEROOBJECTIVE, DEFAULT_MINFIXINGRATE_CROSSOVER, DEFAULT_MINFIXINGRATE_DINS, DEFAULT_MINFIXINGRATE_LOCALBRANCHING, DEFAULT_MINFIXINGRATE_MUTATION, DEFAULT_MINFIXINGRATE_PROXIMITY, DEFAULT_MINFIXINGRATE_RENS, DEFAULT_MINFIXINGRATE_RINS, DEFAULT_MINFIXINGRATE_TRUSTREGION, DEFAULT_MINFIXINGRATE_ZEROOBJECTIVE, DEFAULT_NPOOLSOLS_DINS, DEFAULT_NSOLS_CROSSOVER, DEFAULT_PRIORITY_CROSSOVER, DEFAULT_PRIORITY_DINS, DEFAULT_PRIORITY_LOCALBRANCHING, DEFAULT_PRIORITY_MUTATION, DEFAULT_PRIORITY_PROXIMITY, DEFAULT_PRIORITY_RENS, DEFAULT_PRIORITY_RINS, DEFAULT_PRIORITY_TRUSTREGION, DEFAULT_PRIORITY_ZEROOBJECTIVE, DEFAULT_VIOLPENALTY_TRUSTREGION, Nh::dins, FALSE, HEUR_NAME, data_dins::npoolsols, data_crossover::nsols, NULL, data_crossover::rng, schedulerIncludeNeighborhood(), SCIP_CALL, SCIP_OKAY, SCIP_REAL_MAX, SCIPaddIntParam(), SCIPaddRealParam(), SCIPallocBlockMemory, TRUE, Nh::trustregion, and data_trustregion::violpenalty.
Referenced by SCIPincludeHeurScheduler().
◆ SCIP_DECL_HEURINIT()
|
static |
initialization method of primal heuristic (called after problem was transformed)
Definition at line 4031 of file heur_scheduler.c.
References FALSE, Nh::fixingrate, heurStatsReset(), neighborhoodInit(), NULL, resetFixingRate(), SCIP_CALL, SCIP_OKAY, SCIPcreateSol(), SCIPfreeBlockMemoryArray, SCIPheurGetData(), and Nh::stats.
◆ SCIP_DECL_HEURINITSOL()
|
static |
solving process initialization method of primal heuristic (called when branch and bound process is about to begin)
Definition at line 4075 of file heur_scheduler.c.
References Nh::active, createBandit(), NULL, resetCurrentNeighborhood(), resetTargetNodeLimit(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPbanditGetNActions(), SCIPfreeBandit(), SCIPfreeBufferArray, SCIPgetNVars(), SCIPheurGetData(), SCIPresetBandit(), SCIPsortRealInt(), and SCIPswapPointers().
◆ SCIP_DECL_HEUREXIT()
|
static |
deinitialization method of primal heuristic (called before transformed problem is freed)
Definition at line 4195 of file heur_scheduler.c.
References neighborhoodExit(), NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeSol(), and SCIPheurGetData().
◆ SCIP_DECL_HEURFREE()
|
static |
destructor of primal heuristic to free user data (called when SCIP is exiting)
Definition at line 4222 of file heur_scheduler.c.
References NNEIGHBORHOODS, NULL, schedulerFreeDivingHeur(), schedulerFreeNeighborhood(), SCIP_CALL, SCIP_OKAY, SCIPfreeBandit(), SCIPfreeBlockMemory, SCIPfreeBlockMemoryArray, and SCIPheurGetData().
◆ SCIP_DECL_TABLEOUTPUT()
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output method of statistics table to output file stream 'file'
Definition at line 4270 of file heur_scheduler.c.
References HEUR_NAME, NULL, printDivingHeurStatistics(), printNeighborhoodStatistics(), SCIP_OKAY, SCIPfindHeur(), and SCIPheurGetData().