SCIP
Solving Constraint Integer Programs
Detailed Description
fullstrong branching on fractional and multi-aggregated variables
This branching rule uses all fractional binary and integer variables as candidates, as well as fractional multiaggregated binary and integer variables. Although not directly contained in the presolved problem anymore, the multi-aggregation provides an affine linear sum of integer variables, on which branching can be performed.
For more details, see G.Gamrath, A.Melchiori, T.Berthold, A.M.Gleixner, D.Salvagnin: Branching on Multi-aggregated Variables (http://dx.doi.org/10.1007/978-3-319-18008-3_10)
Definition in file branch_multaggr.c.
#include "blockmemshell/memory.h"#include "scip/branch_fullstrong.h"#include "scip/branch_multaggr.h"#include "scip/cons_linear.h"#include "scip/pub_branch.h"#include "scip/pub_cons.h"#include "scip/pub_message.h"#include "scip/pub_tree.h"#include "scip/pub_var.h"#include "scip/scip_branch.h"#include "scip/scip_cons.h"#include "scip/scip_general.h"#include "scip/scip_lp.h"#include "scip/scip_mem.h"#include "scip/scip_message.h"#include "scip/scip_numerics.h"#include "scip/scip_param.h"#include "scip/scip_prob.h"#include "scip/scip_probing.h"#include "scip/scip_solvingstats.h"#include "scip/scip_tree.h"#include "scip/set.h"#include "scip/struct_scip.h"#include "scip/var.h"#include <string.h>Go to the source code of this file.
Macros | |
| #define | BRANCHRULE_NAME "multaggr" |
| #define | BRANCHRULE_DESC "fullstrong branching on fractional and multi-aggregated variables" |
| #define | BRANCHRULE_PRIORITY 0 |
| #define | BRANCHRULE_MAXDEPTH -1 |
| #define | BRANCHRULE_MAXBOUNDDIST 1.0 |
| #define | DEFAULT_REEVALAGE 0LL |
| #define | DEFAULT_MAXPROPROUNDS 0 |
| #define | DEFAULT_PROBINGBOUNDS TRUE |
Functions | |
| static SCIP_RETCODE | selectVarMultAggrBranching (SCIP *scip, SCIP_VAR **bestcand, SCIP_Real *bestscore, SCIP_Real *bestsol, SCIP_Real *bestdown, SCIP_Real *bestup, SCIP_Bool *bestdownvalid, SCIP_Bool *bestupvalid, SCIP_Real *provedbound, SCIP_Real *estimatedown, SCIP_Real *estimateup, SCIP_RESULT *result) |
| static | SCIP_DECL_BRANCHCOPY (branchCopyMultAggr) |
| static | SCIP_DECL_BRANCHFREE (branchFreeMultAggr) |
| static | SCIP_DECL_BRANCHINIT (branchInitMultAggr) |
| static | SCIP_DECL_BRANCHEXIT (branchExitMultAggr) |
| static | SCIP_DECL_BRANCHEXECLP (branchExeclpMultAggr) |
| SCIP_RETCODE | SCIPincludeBranchruleMultAggr (SCIP *scip) |
Macro Definition Documentation
◆ BRANCHRULE_NAME
| #define BRANCHRULE_NAME "multaggr" |
Definition at line 57 of file branch_multaggr.c.
Referenced by SCIPincludeBranchruleMultAggr(), and selectVarMultAggrBranching().
◆ BRANCHRULE_DESC
| #define BRANCHRULE_DESC "fullstrong branching on fractional and multi-aggregated variables" |
Definition at line 58 of file branch_multaggr.c.
Referenced by SCIPincludeBranchruleMultAggr().
◆ BRANCHRULE_PRIORITY
| #define BRANCHRULE_PRIORITY 0 |
Definition at line 59 of file branch_multaggr.c.
Referenced by SCIPincludeBranchruleMultAggr().
◆ BRANCHRULE_MAXDEPTH
| #define BRANCHRULE_MAXDEPTH -1 |
Definition at line 60 of file branch_multaggr.c.
Referenced by SCIPincludeBranchruleMultAggr().
◆ BRANCHRULE_MAXBOUNDDIST
| #define BRANCHRULE_MAXBOUNDDIST 1.0 |
Definition at line 61 of file branch_multaggr.c.
Referenced by SCIPincludeBranchruleMultAggr().
◆ DEFAULT_REEVALAGE
| #define DEFAULT_REEVALAGE 0LL |
number of intermediate LPs solved to trigger reevaluation of strong branching value for a variable that was already evaluated at the current node
Definition at line 64 of file branch_multaggr.c.
Referenced by SCIPincludeBranchruleMultAggr().
◆ DEFAULT_MAXPROPROUNDS
| #define DEFAULT_MAXPROPROUNDS 0 |
maximum number of propagation rounds to be performed during multaggr branching before solving the LP (-1: no limit, -2: parameter settings)
Definition at line 67 of file branch_multaggr.c.
Referenced by SCIPincludeBranchruleMultAggr().
◆ DEFAULT_PROBINGBOUNDS
| #define DEFAULT_PROBINGBOUNDS TRUE |
should valid bounds be identified in a probing-like fashion during multi-aggr branching (only with propagation)?
Definition at line 70 of file branch_multaggr.c.
Referenced by SCIPincludeBranchruleMultAggr().
Function Documentation
◆ selectVarMultAggrBranching()
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static |
- Parameters
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scip original SCIP data structure bestcand the best candidate variable selected by strong branching bestscore score of the best branching candidate bestsol solution value of the best branching candidate bestdown objective value of the down node when branching on bestcand bestup objective value of the up node when branching on bestcand bestdownvalid is bestdown a valid dual bound for the down branch? bestupvalid is bestup a valid dual bound for the up branch? provedbound proved dual bound for the current subtree estimatedown pointer to store the down child nodes estimate estimateup pointer to store the up child nodes estimate result pointer to store results of branching
Definition at line 158 of file branch_multaggr.c.
References BRANCHRULE_NAME, FALSE, MAX, MIN, NULL, SCIP_Bool, SCIP_CALL, SCIP_CONSADDED, SCIP_CUTOFF, SCIP_DECL_BRANCHCOPY(), SCIP_DIDNOTRUN, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_ITERLIMIT, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_TIMELIMIT, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_MAXTREEDEPTH, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIP_VARTYPE_BINARY, SCIP_VARTYPE_INTEGER, SCIPaddConsNode(), SCIPallColsInLP(), SCIPallocBufferArray, SCIPbacktrackProbing(), SCIPbranchruleGetData(), SCIPconsGetName(), SCIPcreateConsLinear(), SCIPdebugMsg, SCIPendProbing(), SCIPfeasCeil(), SCIPfeasFloor(), SCIPfindBranchrule(), SCIPfreeBufferArray, SCIPgetBranchScore(), SCIPgetCurrentNode(), SCIPgetCutoffbound(), SCIPgetDepth(), SCIPgetFixedVars(), SCIPgetLPBranchCands(), SCIPgetLPObjval(), SCIPgetLPSolstat(), SCIPgetNFixedVars(), SCIPinfinity(), SCIPinfoMessage(), SCIPisExactSolve(), SCIPisFeasIntegral(), SCIPisGE(), SCIPnewProbingNode(), SCIPnodeGetLowerbound(), SCIPprintCons(), SCIPreleaseCons(), SCIPsetFeasCeil(), SCIPsetFeasFloor(), SCIPsolveProbingLP(), SCIPstartProbing(), SCIPstatistic, SCIPvarGetLPSol(), SCIPvarGetMultaggrConstant(), SCIPvarGetMultaggrNVars(), SCIPvarGetMultaggrScalars(), SCIPvarGetMultaggrVars(), SCIPvarGetName(), SCIPvarGetPseudocost(), SCIPvarGetStatus(), SCIPvarGetType(), Scip::set, Scip::stat, and TRUE.
◆ SCIP_DECL_BRANCHCOPY()
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static |
copy method for branchrule plugins (called when SCIP copies plugins)
Definition at line 565 of file branch_multaggr.c.
Referenced by selectVarMultAggrBranching().
◆ SCIP_DECL_BRANCHFREE()
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static |
destructor of branching rule to free user data (called when SCIP is exiting)
Definition at line 579 of file branch_multaggr.c.
◆ SCIP_DECL_BRANCHINIT()
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static |
initialization method of branching rule (called after problem was transformed)
Definition at line 599 of file branch_multaggr.c.
◆ SCIP_DECL_BRANCHEXIT()
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static |
deinitialization method of branching rule (called before transformed problem is freed)
Definition at line 636 of file branch_multaggr.c.
◆ SCIP_DECL_BRANCHEXECLP()
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static |
branching execution method for fractional LP solutions
Definition at line 737 of file branch_multaggr.c.