branch_vanillafullstrong.h File Reference

Detailed Description

vanilla full strong LP branching rule

Author

Tobias Achterberg

Maxime Gasse

The vanilla full strong branching rule is a purged implementation of full strong branching, for academic purposes. It implements full strong branching with the following specific features:

• no cutoff or domain reduction: only branching.
• idempotent (optional): leave SCIP, as much as possible, in the same state before / after the strong branching calls. Basically, do not update any statistic.
• donotbranch (optional): do no perform branching. So that the brancher can be called as an oracle only (on which variable would you branch ? But do not branch please).
• scoreall (optional): continue scoring variables, even if infeasibility is detected along the way.
• collectscores (optional): store the candidate scores from the last call, which can then be retrieved by calling SCIPgetVanillafullstrongData().
• integralcands (optional): get candidates from SCIPgetPseudoBranchCands() instead of SCIPgetLPBranchCands(), i.e., consider all non-fixed variables as branching candidates, not only fractional ones.

Definition in file branch_vanillafullstrong.h.

#include "scip/def.h"
#include "scip/type_result.h"
#include "scip/type_retcode.h"
#include "scip/type_scip.h"
#include "scip/type_var.h"

Go to the source code of this file.

Functions
SCIP_RETCODE	SCIPincludeBranchruleVanillafullstrong (SCIP *scip)
SCIP_RETCODE	SCIPgetVanillafullstrongData (SCIP *scip, SCIP_VAR ***cands, SCIP_Real **candscores, int *ncands, int *npriocands, int *bestcand)

Function Documentation

SCIPgetVanillafullstrongData()

SCIP_RETCODE SCIPgetVanillafullstrongData	(	SCIP *	scip,
		SCIP_VAR ***	cands,
		SCIP_Real **	candscores,
		int *	ncands,
		int *	npriocands,
		int *	bestcand
	)

recovers candidate variables and their scores from last vanilla full strong branching call

Parameters

scip	SCIP data structure
cands	pointer to store candidate variables; or NULL
candscores	pointer to store candidate scores; or NULL
ncands	pointer to store number of candidates; or NULL
npriocands	pointer to store number of priority candidates; or NULL
bestcand	pointer to store best branching candidate; or NULL

Definition at line 561 of file branch_vanillafullstrong.c.

References BRANCHRULE_NAME, NULL, SCIP_OKAY, SCIPbranchruleGetData(), and SCIPfindBranchrule().