LP diving heuristic that chooses fixings w.r.t. the fractionalities.
Definition in file heur_fracdiving.c.
#include "scip/heur_fracdiving.h"
#include "scip/heuristics.h"
#include "scip/pub_heur.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_var.h"
#include "scip/scip_heur.h"
#include "scip/scip_mem.h"
#include "scip/scip_numerics.h"
#include "scip/scip_prob.h"
#include "scip/scip_sol.h"
#include <string.h>
Go to the source code of this file.
Macros | |
#define | HEUR_NAME "fracdiving" |
#define | HEUR_DESC "LP diving heuristic that chooses fixings w.r.t. the fractionalities" |
#define | HEUR_DISPCHAR SCIP_HEURDISPCHAR_DIVING |
#define | HEUR_PRIORITY -1003000 |
#define | HEUR_FREQ 10 |
#define | HEUR_FREQOFS 3 |
#define | HEUR_MAXDEPTH -1 |
#define | HEUR_TIMING SCIP_HEURTIMING_AFTERLPPLUNGE |
#define | HEUR_USESSUBSCIP FALSE |
#define | DIVESET_DIVETYPES SCIP_DIVETYPE_INTEGRALITY | SCIP_DIVETYPE_SOS1VARIABLE |
#define | DIVESET_ISPUBLIC TRUE |
#define | DEFAULT_MINRELDEPTH 0.0 |
#define | DEFAULT_MAXRELDEPTH 1.0 |
#define | DEFAULT_MAXLPITERQUOT 0.05 |
#define | DEFAULT_MAXLPITEROFS 1000 |
#define | DEFAULT_MAXDIVEUBQUOT 0.8 |
#define | DEFAULT_MAXDIVEAVGQUOT 0.0 |
#define | DEFAULT_MAXDIVEUBQUOTNOSOL 0.1 |
#define | DEFAULT_MAXDIVEAVGQUOTNOSOL 0.0 |
#define | DEFAULT_BACKTRACK TRUE |
#define | DEFAULT_LPRESOLVEDOMCHGQUOT 0.15 |
#define | DEFAULT_LPSOLVEFREQ 0 |
#define | DEFAULT_ONLYLPBRANCHCANDS FALSE |
#define | DEFAULT_RANDSEED 89 |
#define | divesetAvailableFracdiving NULL |
Functions | |
static | SCIP_DECL_HEURCOPY (heurCopyFracdiving) |
static | assert (heur !=NULL) |
assert (strcmp(SCIPheurGetName(heur), HEUR_NAME)==0) | |
assert (scip !=NULL) | |
assert (heurdata !=NULL) | |
SCIPfreeBlockMemory (scip, &heurdata) | |
SCIPheurSetData (heur, NULL) | |
SCIPcreateSol (scip, &heurdata->sol, heur)) | |
SCIPfreeSol (scip, &heurdata->sol)) | |
assert (SCIPheurGetNDivesets(heur) > 0) | |
assert (SCIPheurGetDivesets(heur) !=NULL) | |
assert (diveset !=NULL) | |
SCIPperformGenericDivingAlgorithm (scip, diveset, heurdata->sol, heur, result, nodeinfeasible, -1L, -1, -1.0, SCIP_DIVECONTEXT_SINGLE)) | |
static | SCIP_DECL_DIVESETGETSCORE (divesetGetScoreFracdiving) |
SCIP_RETCODE | SCIPincludeHeurFracdiving (SCIP *scip) |
Variables | |
heurdata = SCIPheurGetData(heur) | |
return | SCIP_OKAY |
static SCIP_DIVESET * | diveset |
* | result = SCIP_DIDNOTRUN |
#define HEUR_NAME "fracdiving" |
Definition at line 46 of file heur_fracdiving.c.
#define HEUR_DESC "LP diving heuristic that chooses fixings w.r.t. the fractionalities" |
Definition at line 47 of file heur_fracdiving.c.
#define HEUR_DISPCHAR SCIP_HEURDISPCHAR_DIVING |
Definition at line 48 of file heur_fracdiving.c.
#define HEUR_PRIORITY -1003000 |
Definition at line 49 of file heur_fracdiving.c.
#define HEUR_FREQ 10 |
Definition at line 50 of file heur_fracdiving.c.
#define HEUR_FREQOFS 3 |
Definition at line 51 of file heur_fracdiving.c.
#define HEUR_MAXDEPTH -1 |
Definition at line 52 of file heur_fracdiving.c.
#define HEUR_TIMING SCIP_HEURTIMING_AFTERLPPLUNGE |
Definition at line 53 of file heur_fracdiving.c.
#define HEUR_USESSUBSCIP FALSE |
does the heuristic use a secondary SCIP instance?
Definition at line 54 of file heur_fracdiving.c.
#define DIVESET_DIVETYPES SCIP_DIVETYPE_INTEGRALITY | SCIP_DIVETYPE_SOS1VARIABLE |
bit mask that represents all supported dive types
Definition at line 55 of file heur_fracdiving.c.
#define DIVESET_ISPUBLIC TRUE |
is this dive set publicly available (ie., can be used by other primal heuristics?)
Definition at line 56 of file heur_fracdiving.c.
#define DEFAULT_MINRELDEPTH 0.0 |
minimal relative depth to start diving
Definition at line 63 of file heur_fracdiving.c.
#define DEFAULT_MAXRELDEPTH 1.0 |
maximal relative depth to start diving
Definition at line 64 of file heur_fracdiving.c.
#define DEFAULT_MAXLPITERQUOT 0.05 |
maximal fraction of diving LP iterations compared to node LP iterations
Definition at line 65 of file heur_fracdiving.c.
#define DEFAULT_MAXLPITEROFS 1000 |
additional number of allowed LP iterations
Definition at line 66 of file heur_fracdiving.c.
#define DEFAULT_MAXDIVEUBQUOT 0.8 |
maximal quotient (curlowerbound - lowerbound)/(cutoffbound - lowerbound) where diving is performed (0.0: no limit)
Definition at line 67 of file heur_fracdiving.c.
#define DEFAULT_MAXDIVEAVGQUOT 0.0 |
maximal quotient (curlowerbound - lowerbound)/(avglowerbound - lowerbound) where diving is performed (0.0: no limit)
Definition at line 69 of file heur_fracdiving.c.
#define DEFAULT_MAXDIVEUBQUOTNOSOL 0.1 |
maximal UBQUOT when no solution was found yet (0.0: no limit)
Definition at line 71 of file heur_fracdiving.c.
#define DEFAULT_MAXDIVEAVGQUOTNOSOL 0.0 |
maximal AVGQUOT when no solution was found yet (0.0: no limit)
Definition at line 72 of file heur_fracdiving.c.
#define DEFAULT_BACKTRACK TRUE |
use one level of backtracking if infeasibility is encountered?
Definition at line 73 of file heur_fracdiving.c.
#define DEFAULT_LPRESOLVEDOMCHGQUOT 0.15 |
percentage of immediate domain changes during probing to trigger LP resolve
Definition at line 75 of file heur_fracdiving.c.
#define DEFAULT_LPSOLVEFREQ 0 |
LP solve frequency for diving heuristics
Definition at line 76 of file heur_fracdiving.c.
#define DEFAULT_ONLYLPBRANCHCANDS FALSE |
should only LP branching candidates be considered instead of the slower but more general constraint handler diving variable selection?
Definition at line 77 of file heur_fracdiving.c.
#define DEFAULT_RANDSEED 89 |
initial random seed
Definition at line 79 of file heur_fracdiving.c.
#define divesetAvailableFracdiving NULL |
Definition at line 275 of file heur_fracdiving.c.
Referenced by SCIPincludeHeurFracdiving().
|
static |
copy method for primal heuristic plugins (called when SCIP copies plugins)
Definition at line 98 of file heur_fracdiving.c.
References assert(), HEUR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPheurGetName(), and SCIPincludeHeurFracdiving().
assert | ( | heur ! | = NULL | ) |
assert | ( | strcmp(SCIPheurGetName(heur), HEUR_NAME) | = =0 | ) |
References HEUR_NAME.
SCIPfreeBlockMemory | ( | scip | , |
& | heurdata ) |
References heurdata.
assert | ( | SCIPheurGetNDivesets(heur) | , |
0 | ) |
assert | ( | SCIPheurGetDivesets(heur) ! | = NULL | ) |
SCIPperformGenericDivingAlgorithm | ( | scip | , |
diveset | , | ||
heurdata-> | sol, | ||
heur | , | ||
result | , | ||
nodeinfeasible | , | ||
- | 1L, | ||
- | 1, | ||
-1. | 0, | ||
SCIP_DIVECONTEXT_SINGLE | ) |
References diveset, heurdata, result, SCIP_DIVECONTEXT_SINGLE, and SCIP_OKAY.
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static |
calculate score and preferred rounding direction for the candidate variable; the best candidate maximizes the score
Definition at line 197 of file heur_fracdiving.c.
References assert(), diveset, mayrounddown, mayroundup, obj, roundup, SCIP_Bool, SCIP_DIVETYPE_SOS1VARIABLE, SCIP_OKAY, SCIP_PROBINGSCORE_PENALTYRATIO, SCIP_Real, SCIPdivesetGetRandnumgen(), SCIPgetObjNorm(), SCIPisEQ(), SCIPisFeasPositive(), SCIPisPositive(), SCIPrandomGetInt(), SCIPvarGetObj(), SCIPvarIsBinary(), SCIPvarMayRoundDown(), and SCIPvarMayRoundUp().
heurdata = SCIPheurGetData(heur) |
Definition at line 121 of file heur_fracdiving.c.
return SCIP_OKAY |
Definition at line 127 of file heur_fracdiving.c.
diveset |
execution method of primal heuristic
Definition at line 176 of file heur_fracdiving.c.
* result = SCIP_DIDNOTRUN |
Definition at line 186 of file heur_fracdiving.c.