Detailed Description
relaxation based column selection primal heuristic
Definition in file heur_relaxcolsel.c.
Go to the source code of this file.
Data Structures | |
struct | SCIP_HeurData |
Macros | |
#define | HEUR_NAME "relaxcolsel" |
#define | HEUR_DESC "column selection heuristic that tries to round a master LP solution in promising directions" |
#define | HEUR_DISPCHAR 'x' |
#define | HEUR_PRIORITY -100 |
#define | HEUR_FREQ 1 |
#define | HEUR_FREQOFS 0 |
#define | HEUR_MAXDEPTH -1 |
#define | HEUR_TIMING SCIP_HEURTIMING_AFTERLPNODE |
#define | HEUR_USESSUBSCIP FALSE |
#define | DEFAULT_MINCOLUMNS 200 |
#define | heurCopyRelaxcolsel NULL |
#define | heurInitsolRelaxcolsel NULL |
#define | heurExitsolRelaxcolsel NULL |
Functions | |
static SCIP_RETCODE | initializeStartsol (SCIP *scip, SCIP_SOL *mastersol, SCIP_SOL *origsol, int *blocknr, int *mastercands, SCIP_Real *candfracs, int *nmastercands, SCIP_Bool *success) |
static SCIP_RETCODE | searchZeroMastervar (SCIP *scip, int block, SCIP_VAR **zeromastervar) |
static SCIP_RETCODE | getZeroMastervar (SCIP *scip, SCIP_HEURDATA *heurdata, int block, SCIP_VAR **zeromastervar) |
static | SCIP_DECL_HEURFREE (heurFreeRelaxcolsel) |
static | SCIP_DECL_HEURINIT (heurInitRelaxcolsel) |
static | SCIP_DECL_HEUREXIT (heurExitRelaxcolsel) |
static | SCIP_DECL_HEUREXEC (heurExecRelaxcolsel) |
SCIP_RETCODE | SCIPincludeHeurRelaxcolsel (SCIP *scip) |
Macro Definition Documentation
◆ HEUR_NAME
#define HEUR_NAME "relaxcolsel" |
Definition at line 42 of file heur_relaxcolsel.c.
◆ HEUR_DESC
#define HEUR_DESC "column selection heuristic that tries to round a master LP solution in promising directions" |
Definition at line 43 of file heur_relaxcolsel.c.
◆ HEUR_DISPCHAR
#define HEUR_DISPCHAR 'x' |
Definition at line 44 of file heur_relaxcolsel.c.
◆ HEUR_PRIORITY
#define HEUR_PRIORITY -100 |
Definition at line 45 of file heur_relaxcolsel.c.
◆ HEUR_FREQ
#define HEUR_FREQ 1 |
Definition at line 46 of file heur_relaxcolsel.c.
◆ HEUR_FREQOFS
#define HEUR_FREQOFS 0 |
Definition at line 47 of file heur_relaxcolsel.c.
◆ HEUR_MAXDEPTH
#define HEUR_MAXDEPTH -1 |
Definition at line 48 of file heur_relaxcolsel.c.
◆ HEUR_TIMING
#define HEUR_TIMING SCIP_HEURTIMING_AFTERLPNODE |
Definition at line 49 of file heur_relaxcolsel.c.
◆ HEUR_USESSUBSCIP
#define HEUR_USESSUBSCIP FALSE |
Definition at line 50 of file heur_relaxcolsel.c.
◆ DEFAULT_MINCOLUMNS
#define DEFAULT_MINCOLUMNS 200 |
minimum number of columns to regard in the master problem
Definition at line 52 of file heur_relaxcolsel.c.
◆ heurCopyRelaxcolsel
#define heurCopyRelaxcolsel NULL |
copy method for primal heuristic plugins (called when SCIP copies plugins)
Definition at line 450 of file heur_relaxcolsel.c.
◆ heurInitsolRelaxcolsel
#define heurInitsolRelaxcolsel NULL |
solving process initialization method of primal heuristic (called when branch and bound process is about to begin)
Definition at line 534 of file heur_relaxcolsel.c.
◆ heurExitsolRelaxcolsel
#define heurExitsolRelaxcolsel NULL |
solving process deinitialization method of primal heuristic (called before branch and bound process data is freed)
Definition at line 538 of file heur_relaxcolsel.c.
Function Documentation
◆ initializeStartsol()
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static |
initialize working solution as the rounded down master LP solution (and its original counterpart) and the master variable candidates for rounding up
Definition at line 86 of file heur_relaxcolsel.c.
References GCGgetNPricingprobs(), GCGlinkingVarGetPricingVars(), GCGmasterGetOrigprob(), GCGmasterVarGetNOrigvars(), GCGmasterVarGetOrigvals(), GCGmasterVarGetOrigvars(), GCGmasterVarIsArtificial(), GCGmasterVarIsRay(), GCGoriginalVarGetMastervars(), GCGoriginalVarGetPricingVar(), GCGoriginalVarIsLinking(), GCGpricingVarGetNOrigvars(), GCGpricingVarGetOrigvars(), GCGvarGetBlock(), GCGvarIsMaster(), GCGvarIsOriginal(), and GCGvarIsPricing().
Referenced by SCIP_DECL_HEUREXEC().
◆ searchZeroMastervar()
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static |
for a given block, search if there is a master variable corresponding to the zero solution;
Definition at line 373 of file heur_relaxcolsel.c.
References GCGmasterVarGetNOrigvars(), GCGmasterVarGetOrigvals(), and GCGvarGetBlock().
Referenced by getZeroMastervar().
◆ getZeroMastervar()
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static |
for a given block, return the master variable corresponding to the zero solution, or NULL is there is no such variable available
Definition at line 425 of file heur_relaxcolsel.c.
References searchZeroMastervar().
Referenced by SCIP_DECL_HEUREXEC().
◆ SCIP_DECL_HEURFREE()
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static |
destructor of primal heuristic to free user data (called when SCIP is exiting)
Definition at line 454 of file heur_relaxcolsel.c.
◆ SCIP_DECL_HEURINIT()
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static |
initialization method of primal heuristic (called after problem was transformed)
Definition at line 475 of file heur_relaxcolsel.c.
References GCGgetNPricingprobs(), and GCGmasterGetOrigprob().
◆ SCIP_DECL_HEUREXIT()
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static |
deinitialization method of primal heuristic (called before transformed problem is freed)
Definition at line 515 of file heur_relaxcolsel.c.
◆ SCIP_DECL_HEUREXEC()
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static |
execution method of primal heuristic
Definition at line 543 of file heur_relaxcolsel.c.
References GCGgetNIdenticalBlocks(), GCGgetNPricingprobs(), GCGlinkingVarGetPricingVars(), GCGmasterGetOrigprob(), GCGmasterVarGetNOrigvars(), GCGmasterVarGetOrigvals(), GCGmasterVarGetOrigvars(), GCGoriginalVarGetMastervars(), GCGoriginalVarGetPricingVar(), GCGoriginalVarIsLinking(), GCGpricingVarGetNOrigvars(), GCGpricingVarGetOrigvars(), GCGvarGetBlock(), GCGvarIsOriginal(), GCGvarIsPricing(), getZeroMastervar(), and initializeStartsol().
◆ SCIPincludeHeurRelaxcolsel()
SCIP_RETCODE SCIPincludeHeurRelaxcolsel | ( | SCIP * | scip | ) |
creates the relaxation based column selection primal heuristic and includes it in SCIP
- Parameters
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scip SCIP data structure
Definition at line 970 of file heur_relaxcolsel.c.
References DEFAULT_MINCOLUMNS, HEUR_DESC, HEUR_DISPCHAR, HEUR_FREQ, HEUR_FREQOFS, HEUR_MAXDEPTH, HEUR_NAME, HEUR_PRIORITY, HEUR_TIMING, HEUR_USESSUBSCIP, heurCopyRelaxcolsel, heurExitsolRelaxcolsel, and heurInitsolRelaxcolsel.
Referenced by GCGincludeMasterPlugins().