conflict_graphanalysis.c File Reference

Detailed Description

methods and datastructures for conflict analysis

Author

Tobias Achterberg

Timo Berthold

Stefan Heinz

Marc Pfetsch

Michael Winkler

Jakob Witzig

This file implements a conflict analysis method like the one used in modern SAT solvers like zchaff. The algorithm works as follows:

Given is a set of bound changes that are not allowed being applied simultaneously, because they render the current node infeasible (e.g. because a single constraint is infeasible in the these bounds, or because the LP relaxation is infeasible). The goal is to deduce a clause on variables – a conflict clause – representing the "reason" for this conflict, i.e., the branching decisions or the deductions (applied e.g. in domain propagation) that lead to the conflict. This clause can then be added to the constraint set to help cutting off similar parts of the branch and bound tree, that would lead to the same conflict. A conflict clause can also be generated, if the conflict was detected by a locally valid constraint. In this case, the resulting conflict clause is also locally valid in the same depth as the conflict detecting constraint. If all involved variables are binary, a linear (set covering) constraint can be generated, otherwise a bound disjunction constraint is generated. Details are given in

Tobias Achterberg, Conflict Analysis in Mixed Integer Programming
Discrete Optimization, 4, 4-20 (2007)

See also How to use conflict analysis. Here is an outline of the algorithm:

1. Put all the given bound changes to a priority queue, which is ordered, such that the bound change that was applied last due to branching or deduction is at the top of the queue. The variables in the queue are always active problem variables. Because binary variables are preferred over general integer variables, integer variables are put on the priority queue prior to the binary variables. Create an empty conflict set.
2. Remove the top bound change b from the priority queue.
3. Perform the following case distinction:
   1. If the remaining queue is non-empty, and bound change b' (the one that is now on the top of the queue) was applied at the same depth level as b, and if b was a deduction with known inference reason, and if the inference constraint's valid depth is smaller or equal to the conflict detecting constraint's valid depth:
      • Resolve bound change b by asking the constraint that inferred the bound change to put all the bound changes on the priority queue, that lead to the deduction of b. Note that these bound changes have at most the same inference depth level as b, and were deduced earlier than b.
   2. Otherwise, the bound change b was a branching decision or a deduction with missing inference reason, or the inference constraint's validity is more local than the one of the conflict detecting constraint.
      • If a the bound changed corresponds to a binary variable, add it or its negation to the conflict set, depending on which of them is currently fixed to FALSE (i.e., the conflict set consists of literals that cannot be FALSE altogether at the same time).
      • Otherwise put the bound change into the conflict set. Note that if the bound change was a branching, all deduced bound changes remaining in the priority queue have smaller inference depth level than b, since deductions are always applied after the branching decisions. However, there is the possibility, that b was a deduction, where the inference reason was not given or the inference constraint was too local. With this lack of information, we must treat the deduced bound change like a branching, and there may exist other deduced bound changes of the same inference depth level in the priority queue.
4. If priority queue is non-empty, goto step 2.
5. The conflict set represents the conflict clause saying that at least one of the conflict variables must take a different value. The conflict set is then passed to the conflict handlers, that may create a corresponding constraint (e.g. a logicor constraint or bound disjunction constraint) out of these conflict variables and add it to the problem.

If all deduced bound changes come with (global) inference information, depending on the conflict analyzing strategy, the resulting conflict set has the following property:

• 1-FirstUIP: In the depth level where the conflict was found, at most one variable assigned at that level is member of the conflict set. This conflict variable is the first unique implication point of its depth level (FUIP).
• All-FirstUIP: For each depth level, at most one variable assigned at that level is member of the conflict set. This conflict variable is the first unique implication point of its depth level (FUIP).

The user has to do the following to get the conflict analysis running in its current implementation:

• A constraint handler or propagator supporting the conflict analysis must implement the CONSRESPROP/PROPRESPROP call, that processes a bound change inference b and puts all the reason bounds leading to the application of b with calls to SCIPaddConflictBound() on the conflict queue (algorithm step 3.(a)).
• If the current bounds lead to a deduction of a bound change (e.g. in domain propagation), a constraint handler should call SCIPinferVarLbCons() or SCIPinferVarUbCons(), thus providing the constraint that inferred the bound change. A propagator should call SCIPinferVarLbProp() or SCIPinferVarUbProp() instead, thus providing a pointer to itself.
• If (in the current bounds) an infeasibility is detected, the constraint handler or propagator should
  1. call SCIPinitConflictAnalysis() to initialize the conflict queue,
  2. call SCIPaddConflictBound() for each bound that lead to the conflict,
  3. call SCIPanalyzeConflictCons() or SCIPanalyzeConflict() to analyze the conflict and add an appropriate conflict constraint.

Definition in file conflict_graphanalysis.c.

#include "lpi/lpi.h"
#include "scip/conflict_graphanalysis.h"
#include "scip/conflict_dualproofanalysis.h"
#include "scip/clock.h"
#include "scip/conflict.h"
#include "scip/cons.h"
#include "scip/cons_linear.h"
#include "scip/cuts.h"
#include "scip/history.h"
#include "scip/lp.h"
#include "scip/presolve.h"
#include "scip/prob.h"
#include "scip/prop.h"
#include "scip/pub_conflict.h"
#include "scip/pub_cons.h"
#include "scip/pub_lp.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_misc_sort.h"
#include "scip/pub_paramset.h"
#include "scip/pub_prop.h"
#include "scip/pub_tree.h"
#include "scip/pub_var.h"
#include "scip/scip_conflict.h"
#include "scip/scip_cons.h"
#include "scip/scip_mem.h"
#include "scip/scip_sol.h"
#include "scip/scip_var.h"
#include "scip/scip_message.h"
#include "scip/set.h"
#include "scip/sol.h"
#include "scip/struct_conflict.h"
#include "scip/struct_lp.h"
#include "scip/struct_prob.h"
#include "scip/struct_set.h"
#include "scip/struct_stat.h"
#include "scip/struct_tree.h"
#include "scip/struct_var.h"
#include "scip/tree.h"
#include "scip/var.h"
#include "scip/visual.h"
#include <string.h>
#include <strings.h>

Go to the source code of this file.

Functions
static SCIP_RETCODE	conflictsetEnsureBdchginfosMem (SCIP_CONFLICTSET *conflictset, BMS_BLKMEM *blkmem, SCIP_SET *set, int num)
static SCIP_RETCODE	conflictsetAddBound (SCIP_CONFLICTSET *conflictset, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_BDCHGINFO *bdchginfo, SCIP_Real relaxedbd)
static void	conflictsetCalcConflictDepth (SCIP_CONFLICTSET *conflictset)
static SCIP_RETCODE	conflictsetCalcInsertDepth (SCIP_CONFLICTSET *conflictset, SCIP_SET *set, SCIP_TREE *tree)
static SCIP_Bool	conflictsetIsRedundant (SCIP_CONFLICTSET *conflictset1, SCIP_CONFLICTSET *conflictset2)
static SCIP_Bool	checkRedundancy (SCIP_SET *set, SCIP_CONFLICTSET *conflictset)
static SCIP_RETCODE	detectImpliedBounds (SCIP_SET *set, SCIP_PROB *prob, SCIP_STAT *stat, SCIP_TREE *tree, SCIP_EVENTFILTER *eventfilter, BMS_BLKMEM *blkmem, SCIP_PROB *origprob, SCIP_REOPT *reopt, SCIP_LP *lp, SCIP_CONFLICTSET *conflictset, int *nbdchgs, int *nredvars, SCIP_Bool *redundant)
static void	conflictsetClear (SCIP_CONFLICTSET *conflictset)
SCIP_RETCODE	SCIPconflictsetCreate (SCIP_CONFLICTSET **conflictset, BMS_BLKMEM *blkmem)
static SCIP_RETCODE	conflictsetCopy (SCIP_CONFLICTSET **targetconflictset, BMS_BLKMEM *blkmem, SCIP_CONFLICTSET *sourceconflictset, int nadditionalelems)
void	SCIPconflictsetFree (SCIP_CONFLICTSET **conflictset, BMS_BLKMEM *blkmem)
static SCIP_Real	conflictsetCalcScore (SCIP_CONFLICTSET *conflictset, SCIP_SET *set)
	SCIP_DECL_SORTPTRCOMP (SCIPconflicthdlrComp)
	SCIP_DECL_SORTPTRCOMP (SCIPconflicthdlrCompName)
static	SCIP_DECL_PARAMCHGD (paramChgdConflicthdlrPriority)
SCIP_RETCODE	SCIPconflicthdlrCopyInclude (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_SET *set)
static SCIP_RETCODE	doConflicthdlrCreate (SCIP_CONFLICTHDLR **conflicthdlr, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, BMS_BLKMEM *blkmem, const char *name, const char *desc, int priority, SCIP_DECL_CONFLICTCOPY((*conflictcopy)), SCIP_DECL_CONFLICTFREE((*conflictfree)), SCIP_DECL_CONFLICTINIT((*conflictinit)), SCIP_DECL_CONFLICTEXIT((*conflictexit)), SCIP_DECL_CONFLICTINITSOL((*conflictinitsol)), SCIP_DECL_CONFLICTEXITSOL((*conflictexitsol)), SCIP_DECL_CONFLICTEXEC((*conflictexec)), SCIP_CONFLICTHDLRDATA *conflicthdlrdata)
SCIP_RETCODE	SCIPconflicthdlrCreate (SCIP_CONFLICTHDLR **conflicthdlr, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, BMS_BLKMEM *blkmem, const char *name, const char *desc, int priority, SCIP_DECL_CONFLICTCOPY((*conflictcopy)), SCIP_DECL_CONFLICTFREE((*conflictfree)), SCIP_DECL_CONFLICTINIT((*conflictinit)), SCIP_DECL_CONFLICTEXIT((*conflictexit)), SCIP_DECL_CONFLICTINITSOL((*conflictinitsol)), SCIP_DECL_CONFLICTEXITSOL((*conflictexitsol)), SCIP_DECL_CONFLICTEXEC((*conflictexec)), SCIP_CONFLICTHDLRDATA *conflicthdlrdata)
SCIP_RETCODE	SCIPconflicthdlrFree (SCIP_CONFLICTHDLR **conflicthdlr, SCIP_SET *set)
SCIP_RETCODE	SCIPconflicthdlrInit (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_SET *set)
SCIP_RETCODE	SCIPconflicthdlrExit (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_SET *set)
SCIP_RETCODE	SCIPconflicthdlrInitsol (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_SET *set)
SCIP_RETCODE	SCIPconflicthdlrExitsol (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_SET *set)
SCIP_RETCODE	SCIPconflicthdlrExec (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_SET *set, SCIP_NODE *node, SCIP_NODE *validnode, SCIP_BDCHGINFO **bdchginfos, SCIP_Real *relaxedbds, int nbdchginfos, SCIP_CONFTYPE conftype, SCIP_Bool usescutoffbound, SCIP_Bool resolved, SCIP_RESULT *result)
SCIP_CONFLICTHDLRDATA *	SCIPconflicthdlrGetData (SCIP_CONFLICTHDLR *conflicthdlr)
void	SCIPconflicthdlrSetData (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_CONFLICTHDLRDATA *conflicthdlrdata)
void	SCIPconflicthdlrSetCopy (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_DECL_CONFLICTCOPY((*conflictcopy)))
void	SCIPconflicthdlrSetFree (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_DECL_CONFLICTFREE((*conflictfree)))
void	SCIPconflicthdlrSetInit (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_DECL_CONFLICTINIT((*conflictinit)))
void	SCIPconflicthdlrSetExit (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_DECL_CONFLICTEXIT((*conflictexit)))
void	SCIPconflicthdlrSetInitsol (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_DECL_CONFLICTINITSOL((*conflictinitsol)))
void	SCIPconflicthdlrSetExitsol (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_DECL_CONFLICTEXITSOL((*conflictexitsol)))
const char *	SCIPconflicthdlrGetName (SCIP_CONFLICTHDLR *conflicthdlr)
const char *	SCIPconflicthdlrGetDesc (SCIP_CONFLICTHDLR *conflicthdlr)
int	SCIPconflicthdlrGetPriority (SCIP_CONFLICTHDLR *conflicthdlr)
void	SCIPconflicthdlrSetPriority (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_SET *set, int priority)
SCIP_Bool	SCIPconflicthdlrIsInitialized (SCIP_CONFLICTHDLR *conflicthdlr)
void	SCIPconflicthdlrEnableOrDisableClocks (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_Bool enable)
SCIP_Real	SCIPconflicthdlrGetSetupTime (SCIP_CONFLICTHDLR *conflicthdlr)
SCIP_Real	SCIPconflicthdlrGetTime (SCIP_CONFLICTHDLR *conflicthdlr)
SCIP_Bool	SCIPconflictGraphApplicable (SCIP_SET *set)
static SCIP_RETCODE	conflictEnsureTmpbdchginfosMem (SCIP_CONFLICT *conflict, SCIP_SET *set, int num)
SCIP_RETCODE	conflictCreateTmpBdchginfo (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_VAR *var, SCIP_BOUNDTYPE boundtype, SCIP_Real oldbound, SCIP_Real newbound, SCIP_BDCHGINFO **bdchginfo)
static void	conflictFreeTmpBdchginfos (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem)
static SCIP_RETCODE	incVSIDS (SCIP_VAR *var, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_BOUNDTYPE boundtype, SCIP_Real value, SCIP_Real weight)
static SCIP_RETCODE	updateStatistics (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_CONFLICTSET *conflictset, int insertdepth)
static SCIP_RETCODE	conflictAddConflictCons (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *transprob, SCIP_PROB *origprob, SCIP_TREE *tree, SCIP_REOPT *reopt, SCIP_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, SCIP_CLIQUETABLE *cliquetable, SCIP_CONFLICTSET *conflictset, int insertdepth, SCIP_Bool *success)
int	conflictCalcMaxsize (SCIP_SET *set, SCIP_PROB *prob)
SCIP_RETCODE	SCIPconflictFlushConss (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *transprob, SCIP_PROB *origprob, SCIP_TREE *tree, SCIP_REOPT *reopt, SCIP_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, SCIP_CLIQUETABLE *cliquetable)
static SCIP_RETCODE	conflictEnsureConflictsetsMem (SCIP_CONFLICT *conflict, SCIP_SET *set, int num)
static SCIP_RETCODE	conflictInsertConflictset (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_CONFLICTSET **conflictset)
static SCIP_Bool	conflictMarkBoundCheckPresence (SCIP_CONFLICT *conflict, SCIP_SET *set, SCIP_BDCHGINFO *bdchginfo, SCIP_Real relaxedbd)
static SCIP_Bool	betterBoundInResolutionQueue (SCIP_CONFLICT *conflict, SCIP_SET *set, SCIP_BDCHGINFO *bdchginfo)
static SCIP_RETCODE	conflictAddConflictBound (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_BDCHGINFO *bdchginfo, SCIP_Real relaxedbd)
static SCIP_Bool	isBoundchgUseless (SCIP_SET *set, SCIP_BDCHGINFO *bdchginfo)
static SCIP_RETCODE	conflictQueueBound (SCIP_CONFLICT *conflict, SCIP_SET *set, SCIP_BDCHGINFO *bdchginfo, SCIP_Real relaxedbd, SCIP_Bool *success)
static SCIP_RETCODE	conflictAddBound (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_VAR *var, SCIP_BOUNDTYPE boundtype, SCIP_BDCHGINFO *bdchginfo, SCIP_Real relaxedbd)
SCIP_RETCODE	SCIPconflictAnalyzeRemainingBdchgs (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_TREE *tree, SCIP_Bool diving, int *lbchginfoposs, int *ubchginfoposs, int *nconss, int *nliterals, int *nreconvconss, int *nreconvliterals)
SCIP_Bool	bdchginfoIsInvalid (SCIP_CONFLICT *conflict, SCIP_BDCHGINFO *bdchginfo)
static SCIP_RETCODE	conflictsetAddBounds (SCIP_CONFLICT *conflict, SCIP_CONFLICTSET *conflictset, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_BDCHGINFO **bdchginfos, int nbdchginfos)
static SCIP_BDCHGINFO *	conflictRemoveCand (SCIP_CONFLICT *conflict)
static SCIP_BDCHGINFO *	conflictFirstCand (SCIP_CONFLICT *conflict)
static SCIP_RETCODE	conflictAddConflictset (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_TREE *tree, int validdepth, SCIP_Bool diving, SCIP_Bool repropagate, SCIP_Bool *success, int *nliterals)
static SCIP_RETCODE	conflictResolveBound (SCIP_CONFLICT *conflict, SCIP_SET *set, SCIP_BDCHGINFO *bdchginfo, SCIP_Real relaxedbd, int validdepth, SCIP_Bool *resolved)
static void	conflictClear (SCIP_CONFLICT *conflict)
static void	conflictClearResolution (SCIP_CONFLICT *conflict, SCIP_SET *set, SCIP_PROB *prob)
SCIP_RETCODE	SCIPconflictInit (SCIP_CONFLICT *conflict, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_CONFTYPE conftype, SCIP_Bool usescutoffbound)
static SCIP_RETCODE	convertToActiveVar (SCIP_VAR **var, SCIP_SET *set, SCIP_BOUNDTYPE *boundtype, SCIP_Real *bound)
static SCIP_Bool	bdchginfoIsResolvable (SCIP_BDCHGINFO *bdchginfo)
static SCIP_RETCODE	conflictCreateReconvergenceConss (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_TREE *tree, SCIP_Bool diving, int validdepth, SCIP_BDCHGINFO *firstuip, int *nreconvconss, int *nreconvliterals)
SCIP_RETCODE	conflictAnalyze (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_TREE *tree, SCIP_Bool diving, int validdepth, SCIP_Bool mustresolve, int *nconss, int *nliterals, int *nreconvconss, int *nreconvliterals)
static SCIP_Real	calcBdchgScore (SCIP_Real prooflhs, SCIP_Real proofact, SCIP_Real proofactdelta, SCIP_Real proofcoef, int depth, int currentdepth, SCIP_VAR *var, SCIP_SET *set)
static SCIP_RETCODE	ensureCandsSize (SCIP_SET *set, SCIP_VAR ***cands, SCIP_Real **candscores, SCIP_Real **newbounds, SCIP_Real **proofactdeltas, int *candssize, int num)
static void	skipRedundantBdchginfos (SCIP_VAR *var, int *lbchginfopos, int *ubchginfopos)
SCIP_RETCODE	SCIPconflictAddBound (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_VAR *var, SCIP_BOUNDTYPE boundtype, SCIP_BDCHGIDX *bdchgidx)
SCIP_RETCODE	SCIPconflictAddRelaxedBound (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_VAR *var, SCIP_BOUNDTYPE boundtype, SCIP_BDCHGIDX *bdchgidx, SCIP_Real relaxedbd)
SCIP_RETCODE	SCIPconflictIsVarUsed (SCIP_CONFLICT *conflict, SCIP_VAR *var, SCIP_SET *set, SCIP_BOUNDTYPE boundtype, SCIP_BDCHGIDX *bdchgidx, SCIP_Bool *used)
static SCIP_RETCODE	addBdchg (SCIP_SET *set, SCIP_VAR *var, SCIP_Real newlb, SCIP_Real newub, SCIP_LPBDCHGS *oldlpbdchgs, SCIP_LPBDCHGS *relaxedlpbdchgs, SCIP_LPI *lpi)
static SCIP_RETCODE	addCand (SCIP_SET *set, int currentdepth, SCIP_VAR *var, int lbchginfopos, int ubchginfopos, SCIP_Real proofcoef, SCIP_Real prooflhs, SCIP_Real proofact, SCIP_VAR ***cands, SCIP_Real **candscores, SCIP_Real **newbounds, SCIP_Real **proofactdeltas, int *candssize, int *ncands, int firstcand)
SCIP_RETCODE	SCIPundoBdchgsProof (SCIP_SET *set, SCIP_PROB *prob, int currentdepth, SCIP_Real *proofcoefs, SCIP_Real prooflhs, SCIP_Real *proofact, SCIP_Real *curvarlbs, SCIP_Real *curvarubs, int *lbchginfoposs, int *ubchginfoposs, SCIP_LPBDCHGS *oldlpbdchgs, SCIP_LPBDCHGS *relaxedlpbdchgs, SCIP_Bool *resolve, SCIP_LPI *lpi)
static SCIP_RETCODE	undoBdchgsDualfarkas (SCIP_SET *set, SCIP_PROB *prob, SCIP_LP *lp, int currentdepth, SCIP_Real *curvarlbs, SCIP_Real *curvarubs, int *lbchginfoposs, int *ubchginfoposs, SCIP_LPBDCHGS *oldlpbdchgs, SCIP_LPBDCHGS *relaxedlpbdchgs, SCIP_Bool *valid, SCIP_Bool *resolve, SCIP_Real *farkascoefs, SCIP_Real farkaslhs, SCIP_Real *farkasactivity)
static SCIP_RETCODE	lpbdchgsCreate (SCIP_LPBDCHGS **lpbdchgs, SCIP_SET *set, int ncols)
static SCIP_RETCODE	ensureSidechgsSize (SCIP_SET *set, int **sidechginds, SCIP_Real **sidechgoldlhss, SCIP_Real **sidechgoldrhss, SCIP_Real **sidechgnewlhss, SCIP_Real **sidechgnewrhss, int *sidechgssize, int num)
static SCIP_RETCODE	addSideRemoval (SCIP_SET *set, SCIP_ROW *row, SCIP_Real lpiinfinity, int **sidechginds, SCIP_Real **sidechgoldlhss, SCIP_Real **sidechgoldrhss, SCIP_Real **sidechgnewlhss, SCIP_Real **sidechgnewrhss, int *sidechgssize, int *nsidechgs)
static void	lpbdchgsReset (SCIP_LPBDCHGS *lpbdchgs, int ncols)
static void	lpbdchgsFree (SCIP_LPBDCHGS **lpbdchgs, SCIP_SET *set)
static SCIP_RETCODE	undoBdchgsDualsol (SCIP_SET *set, SCIP_PROB *prob, SCIP_LP *lp, int currentdepth, SCIP_Real *curvarlbs, SCIP_Real *curvarubs, int *lbchginfoposs, int *ubchginfoposs, SCIP_LPBDCHGS *oldlpbdchgs, SCIP_LPBDCHGS *relaxedlpbdchgs, SCIP_Bool *valid, SCIP_Bool *resolve, SCIP_Real *dualcoefs, SCIP_Real duallhs, SCIP_Real *dualactivity)
SCIP_RETCODE	SCIPrunBoundHeuristic (SCIP_CONFLICT *conflict, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *origprob, SCIP_PROB *transprob, SCIP_TREE *tree, SCIP_REOPT *reopt, SCIP_LP *lp, SCIP_LPI *lpi, SCIP_EVENTFILTER *eventfilter, BMS_BLKMEM *blkmem, SCIP_Real *proofcoefs, SCIP_Real *prooflhs, SCIP_Real *proofactivity, SCIP_Real *curvarlbs, SCIP_Real *curvarubs, int *lbchginfoposs, int *ubchginfoposs, int *iterations, SCIP_Bool marklpunsolved, SCIP_Bool *dualproofsuccess, SCIP_Bool *valid)
SCIP_RETCODE	SCIPconflictAnalyze (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_TREE *tree, int validdepth, SCIP_Bool *success)

Function Documentation

conflictsetEnsureBdchginfosMem()

static SCIP_RETCODE conflictsetEnsureBdchginfosMem ( SCIP_CONFLICTSET *  conflictset, BMS_BLKMEM *  blkmem, SCIP_SET *  set, int  num  )

static

Conflict sets resizes the arrays of the conflict set to be able to store at least num bound change entries

Parameters

conflictset	conflict set
blkmem	block memory of transformed problem
set	global SCIP settings
num	minimal number of slots in arrays

Definition at line 378 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, SCIP_ConflictSet::bdchginfossize, BMSreallocBlockMemoryArray, NULL, SCIP_ConflictSet::relaxedbds, SCIP_ALLOC, SCIP_OKAY, SCIPsetCalcMemGrowSize(), and SCIP_ConflictSet::sortvals.

Referenced by conflictsetAddBound(), and conflictsetAddBounds().

conflictsetAddBound()

static SCIP_RETCODE conflictsetAddBound ( SCIP_CONFLICTSET *  conflictset, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_BDCHGINFO *  bdchginfo, SCIP_Real  relaxedbd  )

static

adds a bound change to a conflict set

Parameters

conflictset	conflict set
blkmem	block memory of transformed problem
set	global SCIP settings
bdchginfo	bound change to add to the conflict set
relaxedbd	relaxed bound

Definition at line 405 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, conflictsetEnsureBdchginfosMem(), SCIP_ConflictSet::hasrelaxonlyvar, MAX, MIN, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsTighter(), SCIPsortedvecDelPosIntPtrReal(), SCIPsortedvecInsertIntPtrReal(), SCIPvarGetIndex(), SCIPvarIsRelaxationOnly(), SCIP_ConflictSet::sortvals, and TRUE.

Referenced by conflictAddConflictBound(), and conflictsetAddBounds().

conflictsetCalcConflictDepth()

static void conflictsetCalcConflictDepth ( SCIP_CONFLICTSET *  conflictset )

static

calculates the conflict and the repropagation depths of the conflict set

Parameters

conflictset

conflict set

Definition at line 478 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, SCIP_ConflictSet::conflictdepth, SCIP_ConflictSet::insertdepth, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::repropdepth, SCIPbdchginfoGetDepth(), and SCIP_ConflictSet::validdepth.

Referenced by conflictInsertConflictset().

conflictsetCalcInsertDepth()

static SCIP_RETCODE conflictsetCalcInsertDepth ( SCIP_CONFLICTSET *  conflictset, SCIP_SET *  set, SCIP_TREE *  tree  )

static

identifies the depth, at which the conflict set should be added:

• if the branching rule operates on variables only, and if all branching variables up to a certain depth level are member of the conflict, the conflict constraint can only be violated in the subtree of the node at that depth, because in all other nodes, at least one of these branching variables violates its conflicting bound, such that the conflict constraint is feasible
• if there is at least one branching variable in a node, we assume, that this branching was performed on variables, and that the siblings of this node are disjunct w.r.t. the branching variables' fixings
• we have to add the conflict set at least in the valid depth of the initial conflict set, so we start searching at the first branching after this depth level, i.e. validdepth+1

Parameters

conflictset	conflict set
set	global SCIP settings
tree	branch and bound tree

Definition at line 522 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, BMSclearMemoryArray, SCIP_ConflictSet::insertdepth, MIN, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_Tree::pathlen, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPbdchginfoGetDepth(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPtreeGetCurrentDepth(), TRUE, and SCIP_ConflictSet::validdepth.

Referenced by conflictAddConflictset().

conflictsetIsRedundant()

static SCIP_Bool conflictsetIsRedundant ( SCIP_CONFLICTSET *  conflictset1, SCIP_CONFLICTSET *  conflictset2  )

static

checks whether the first conflict set is redundant to the second one

Parameters

conflictset1	first conflict conflict set
conflictset2	second conflict conflict set

Definition at line 569 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, FALSE, SCIP_ConflictSet::nbdchginfos, NULL, SCIPbdchginfoIsTighter(), SCIP_ConflictSet::sortvals, and SCIP_ConflictSet::validdepth.

Referenced by conflictInsertConflictset().

checkRedundancy()

static SCIP_Bool checkRedundancy ( SCIP_SET *  set, SCIP_CONFLICTSET *  conflictset  )

static

check conflict set for redundancy, other conflicts in the same conflict analysis could have led to global reductions an made this conflict set redundant

Parameters

set	global SCIP settings
conflictset	conflict set

Definition at line 633 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, bound, FALSE, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPsetIsFeasGE(), SCIPsetIsFeasLE(), SCIPsetIsGE(), SCIPsetIsIntegral(), SCIPsetIsLE(), SCIPvarGetLbGlobal(), SCIPvarGetProbindex(), SCIPvarGetUbGlobal(), SCIPvarIsIntegral(), and TRUE.

Referenced by detectImpliedBounds().

detectImpliedBounds()

static SCIP_RETCODE detectImpliedBounds ( SCIP_SET *  set, SCIP_PROB *  prob, SCIP_STAT *  stat, SCIP_TREE *  tree, SCIP_EVENTFILTER *  eventfilter, BMS_BLKMEM *  blkmem, SCIP_PROB *  origprob, SCIP_REOPT *  reopt, SCIP_LP *  lp, SCIP_CONFLICTSET *  conflictset, int *  nbdchgs, int *  nredvars, SCIP_Bool *  redundant  )

static

find global fixings which can be derived from the new conflict set

Parameters

set	global SCIP settings
prob	transformed problem after presolve
stat	dynamic SCIP statistics
tree	tree data
eventfilter	global event filter
blkmem	block memory
origprob	original problem
reopt	reoptimization data
lp	LP data
conflictset	conflict set to add to the tree
nbdchgs	number of global deducted bound changes due to the conflict set
nredvars	number of redundant and removed variables from conflict set
redundant	did we found a global reduction on a conflict set variable, which makes this conflict redundant

Definition at line 698 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, BMSclearMemoryArray, bound, checkRedundancy(), FALSE, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPboundtypeOpposite(), SCIPnodeCutoff(), SCIPprobGetName(), SCIPprobIsTransformed(), SCIPsetAllocBufferArray, SCIPsetAllocCleanBufferArray, SCIPsetDebugMsg, SCIPsetDebugMsgPrint, SCIPsetFreeBufferArray, SCIPsetFreeCleanBufferArray, SCIPsetIsEQ(), SCIPsetIsFeasEQ(), SCIPsetIsFeasGT(), SCIPsetIsFeasLT(), SCIPsetIsGE(), SCIPsetIsIntegral(), SCIPsetIsLE(), SCIPsetIsZero(), SCIPshrinkDisjunctiveVarSet(), SCIPsortLongPtrRealRealBool(), SCIPtreeGetRootNode(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetNCliques(), SCIPvarGetNVlbs(), SCIPvarGetNVubs(), SCIPvarGetProbindex(), SCIPvarGetUbGlobal(), SCIPvarIsBinary(), SCIPvarIsIntegral(), SCIP_ConflictSet::sortvals, and TRUE.

Referenced by conflictAddConflictCons().

conflictsetClear()

static void conflictsetClear ( SCIP_CONFLICTSET *  conflictset )

static

clears the given conflict set

Parameters

conflictset

conflict set

Definition at line 972 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::conflictdepth, SCIP_ConflictSet::conflicttype, FALSE, SCIP_ConflictSet::hasrelaxonlyvar, SCIP_ConflictSet::insertdepth, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::repropagate, SCIP_ConflictSet::repropdepth, SCIP_CONFTYPE_UNKNOWN, TRUE, SCIP_ConflictSet::usescutoffbound, and SCIP_ConflictSet::validdepth.

Referenced by conflictClear(), and SCIPconflictsetCreate().

SCIPconflictsetCreate()

SCIP_RETCODE SCIPconflictsetCreate	(	SCIP_CONFLICTSET **	conflictset,
		BMS_BLKMEM *	blkmem
	)

creates an empty conflict set

Parameters

conflictset	pointer to store the conflict set
blkmem	block memory of transformed problem

Definition at line 990 of file conflict_graphanalysis.c.

References BMSallocBlockMemory, conflictsetClear(), NULL, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPconflictCreate().

conflictsetCopy()

static SCIP_RETCODE conflictsetCopy ( SCIP_CONFLICTSET **  targetconflictset, BMS_BLKMEM *  blkmem, SCIP_CONFLICTSET *  sourceconflictset, int  nadditionalelems  )

static

creates a copy of the given conflict set, allocating an additional amount of memory

Parameters

targetconflictset	pointer to store the conflict set
blkmem	block memory of transformed problem
sourceconflictset	source conflict set
nadditionalelems	number of additional elements to allocate memory for

Definition at line 1010 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, BMSallocBlockMemory, BMSallocBlockMemoryArray, BMScopyMemoryArray, SCIP_ConflictSet::conflictdepth, SCIP_ConflictSet::conflicttype, SCIP_ConflictSet::hasrelaxonlyvar, SCIP_ConflictSet::insertdepth, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_ConflictSet::repropdepth, SCIP_ALLOC, SCIP_OKAY, SCIP_ConflictSet::sortvals, SCIP_ConflictSet::usescutoffbound, and SCIP_ConflictSet::validdepth.

Referenced by conflictAddConflictset().

SCIPconflictsetFree()

void SCIPconflictsetFree	(	SCIP_CONFLICTSET **	conflictset,
		BMS_BLKMEM *	blkmem
	)

frees a conflict set

Parameters

conflictset	pointer to the conflict set
blkmem	block memory of transformed problem

Definition at line 1046 of file conflict_graphanalysis.c.

References BMSfreeBlockMemory, BMSfreeBlockMemoryArrayNull, and NULL.

Referenced by conflictAddConflictset(), conflictInsertConflictset(), SCIPconflictFlushConss(), and SCIPconflictFree().

conflictsetCalcScore()

static SCIP_Real conflictsetCalcScore ( SCIP_CONFLICTSET *  conflictset, SCIP_SET *  set  )

static

calculates the score of the conflict set

the score is weighted sum of number of bound changes, repropagation depth, and valid depth

Parameters

conflictset	conflict set
set	global SCIP settings

Definition at line 1065 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::repropdepth, and SCIP_ConflictSet::validdepth.

Referenced by conflictInsertConflictset().

SCIP_DECL_PARAMCHGD()

static SCIP_DECL_PARAMCHGD ( paramChgdConflicthdlrPriority  )

static

method to call, when the priority of a conflict handler was changed

Definition at line 1096 of file conflict_graphanalysis.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPparamGetData(), SCIPparamGetInt(), and SCIPsetConflicthdlrPriority().

SCIPconflicthdlrCopyInclude()

SCIP_RETCODE SCIPconflicthdlrCopyInclude	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_SET *	set
	)

copies the given conflict handler to a new scip

Parameters

conflicthdlr	conflict handler
set	SCIP_SET of SCIP to copy to

Definition at line 1110 of file conflict_graphanalysis.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPconflicthdlrGetName(), and SCIPsetDebugMsg.

Referenced by SCIPsetCopyPlugins().

doConflicthdlrCreate()

static SCIP_RETCODE doConflicthdlrCreate ( SCIP_CONFLICTHDLR **  conflicthdlr, SCIP_SET *  set, SCIP_MESSAGEHDLR *  messagehdlr, BMS_BLKMEM *  blkmem, const char *  name, const char *  desc, int  priority, SCIP_DECL_CONFLICTCOPY((*conflictcopy))  , SCIP_DECL_CONFLICTFREE((*conflictfree))  , SCIP_DECL_CONFLICTINIT((*conflictinit))  , SCIP_DECL_CONFLICTEXIT((*conflictexit))  , SCIP_DECL_CONFLICTINITSOL((*conflictinitsol))  , SCIP_DECL_CONFLICTEXITSOL((*conflictexitsol))  , SCIP_DECL_CONFLICTEXEC((*conflictexec))  , SCIP_CONFLICTHDLRDATA *  conflicthdlrdata  )

static

internal method for creating a conflict handler

Parameters

conflicthdlr	pointer to conflict handler data structure
set	global SCIP settings
messagehdlr	message handler
blkmem	block memory for parameter settings
name	name of conflict handler
desc	description of conflict handler
priority	priority of the conflict handler
conflicthdlrdata	conflict handler data

Definition at line 1130 of file conflict_graphanalysis.c.

References BMSallocMemory, BMSclearMemory, BMSduplicateMemoryArray, FALSE, NULL, paramname, SCIP_ALLOC, SCIP_CALL, SCIP_CLOCKTYPE_DEFAULT, SCIP_MAXSTRLEN, SCIP_OKAY, SCIPclockCreate(), SCIPsetAddIntParam(), SCIPsnprintf(), and TRUE.

Referenced by SCIPconflicthdlrCreate().

SCIPconflicthdlrCreate()

SCIP_RETCODE SCIPconflicthdlrCreate	(	SCIP_CONFLICTHDLR **	conflicthdlr,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		BMS_BLKMEM *	blkmem,
		const char *	name,
		const char *	desc,
		int	priority,
		SCIP_DECL_CONFLICTCOPY((*conflictcopy))	,
		SCIP_DECL_CONFLICTFREE((*conflictfree))	,
		SCIP_DECL_CONFLICTINIT((*conflictinit))	,
		SCIP_DECL_CONFLICTEXIT((*conflictexit))	,
		SCIP_DECL_CONFLICTINITSOL((*conflictinitsol))	,
		SCIP_DECL_CONFLICTEXITSOL((*conflictexitsol))	,
		SCIP_DECL_CONFLICTEXEC((*conflictexec))	,
		SCIP_CONFLICTHDLRDATA *	conflicthdlrdata
	)

creates a conflict handler

Parameters

conflicthdlr	pointer to conflict handler data structure
set	global SCIP settings
messagehdlr	message handler
blkmem	block memory for parameter settings
name	name of conflict handler
desc	description of conflict handler
priority	priority of the conflict handler
conflicthdlrdata	conflict handler data

Definition at line 1184 of file conflict_graphanalysis.c.

References doConflicthdlrCreate(), NULL, SCIP_CALL_FINALLY, SCIP_OKAY, and SCIPconflicthdlrFree().

Referenced by SCIPincludeConflicthdlr(), and SCIPincludeConflicthdlrBasic().

SCIPconflicthdlrFree()

SCIP_RETCODE SCIPconflicthdlrFree	(	SCIP_CONFLICTHDLR **	conflicthdlr,
		SCIP_SET *	set
	)

calls destructor and frees memory of conflict handler

Parameters

conflicthdlr	pointer to conflict handler data structure
set	global SCIP settings

Definition at line 1215 of file conflict_graphanalysis.c.

References BMSfreeMemory, BMSfreeMemoryArrayNull, NULL, SCIP_CALL, SCIP_OKAY, and SCIPclockFree().

Referenced by SCIPconflicthdlrCreate().

SCIPconflicthdlrInit()

SCIP_RETCODE SCIPconflicthdlrInit	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_SET *	set
	)

calls initialization method of conflict handler

Parameters

conflicthdlr	conflict handler
set	global SCIP settings

Definition at line 1243 of file conflict_graphanalysis.c.

References SCIP_Conflicthdlr::conflicttime, SCIP_Conflicthdlr::initialized, SCIP_Conflicthdlr::name, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockReset(), SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, SCIP_Conflicthdlr::setuptime, and TRUE.

SCIPconflicthdlrExit()

SCIP_RETCODE SCIPconflicthdlrExit	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_SET *	set
	)

calls exit method of conflict handler

Parameters

conflicthdlr	conflict handler
set	global SCIP settings

Definition at line 1280 of file conflict_graphanalysis.c.

References FALSE, SCIP_Conflicthdlr::initialized, SCIP_Conflicthdlr::name, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, and SCIP_Conflicthdlr::setuptime.

SCIPconflicthdlrInitsol()

SCIP_RETCODE SCIPconflicthdlrInitsol	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_SET *	set
	)

informs conflict handler that the branch and bound process is being started

Parameters

conflicthdlr	conflict handler
set	global SCIP settings

Definition at line 1311 of file conflict_graphanalysis.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Conflicthdlr::setuptime.

SCIPconflicthdlrExitsol()

SCIP_RETCODE SCIPconflicthdlrExitsol	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_SET *	set
	)

informs conflict handler that the branch and bound process data is being freed

Parameters

conflicthdlr	conflict handler
set	global SCIP settings

Definition at line 1335 of file conflict_graphanalysis.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Conflicthdlr::setuptime.

SCIPconflicthdlrExec()

SCIP_RETCODE SCIPconflicthdlrExec	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_SET *	set,
		SCIP_NODE *	node,
		SCIP_NODE *	validnode,
		SCIP_BDCHGINFO **	bdchginfos,
		SCIP_Real *	relaxedbds,
		int	nbdchginfos,
		SCIP_CONFTYPE	conftype,
		SCIP_Bool	usescutoffbound,
		SCIP_Bool	resolved,
		SCIP_RESULT *	result
	)

calls execution method of conflict handler

Parameters

conflicthdlr	conflict handler
set	global SCIP settings
node	node to add conflict constraint to
validnode	node at which the constraint is valid
bdchginfos	bound change resembling the conflict set
relaxedbds	array with relaxed bounds which are efficient to create a valid conflict
nbdchginfos	number of bound changes in the conflict set
conftype	type of the conflict
usescutoffbound	depends the conflict on the cutoff bound?
resolved	was the conflict set already used to create a constraint?
result	pointer to store the result of the callback method

Definition at line 1359 of file conflict_graphanalysis.c.

References SCIP_Conflicthdlr::conflicttime, SCIP_Conflicthdlr::name, NULL, SCIP_CALL, SCIP_CONSADDED, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_INVALIDRESULT, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, and SCIPnodeGetDepth().

Referenced by conflictAddConflictCons().

SCIPconflicthdlrSetCopy()

void SCIPconflicthdlrSetCopy	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_DECL_CONFLICTCOPY((*conflictcopy))
	)

set copy method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 1427 of file conflict_graphanalysis.c.

References NULL.

Referenced by SCIPsetConflicthdlrCopy().

SCIPconflicthdlrSetFree()

void SCIPconflicthdlrSetFree	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_DECL_CONFLICTFREE((*conflictfree))
	)

set destructor of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 1438 of file conflict_graphanalysis.c.

References NULL.

Referenced by SCIPsetConflicthdlrFree().

SCIPconflicthdlrSetInit()

void SCIPconflicthdlrSetInit	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_DECL_CONFLICTINIT((*conflictinit))
	)

set initialization method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 1450 of file conflict_graphanalysis.c.

References NULL.

Referenced by SCIPsetConflicthdlrInit().

SCIPconflicthdlrSetExit()

void SCIPconflicthdlrSetExit	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_DECL_CONFLICTEXIT((*conflictexit))
	)

set deinitialization method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 1461 of file conflict_graphanalysis.c.

References NULL.

Referenced by SCIPsetConflicthdlrExit().

SCIPconflicthdlrSetInitsol()

void SCIPconflicthdlrSetInitsol	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_DECL_CONFLICTINITSOL((*conflictinitsol))
	)

set solving process initialization method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 1472 of file conflict_graphanalysis.c.

References NULL.

Referenced by SCIPsetConflicthdlrInitsol().

SCIPconflicthdlrSetExitsol()

void SCIPconflicthdlrSetExitsol	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_DECL_CONFLICTEXITSOL((*conflictexitsol))
	)

set solving process deinitialization method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 1483 of file conflict_graphanalysis.c.

References NULL.

Referenced by SCIPsetConflicthdlrExitsol().

SCIPconflicthdlrSetPriority()

void SCIPconflicthdlrSetPriority	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_SET *	set,
		int	priority
	)

sets priority of conflict handler

Parameters

conflicthdlr	conflict handler
set	global SCIP settings
priority	new priority of the conflict handler

Definition at line 1524 of file conflict_graphanalysis.c.

References FALSE, NULL, and SCIP_Conflicthdlr::priority.

Referenced by SCIPsetConflicthdlrPriority().

SCIPconflicthdlrEnableOrDisableClocks()

void SCIPconflicthdlrEnableOrDisableClocks	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_Bool	enable
	)

enables or disables all clocks of conflicthdlr, depending on the value of the flag

Parameters

conflicthdlr	the conflict handler for which all clocks should be enabled or disabled
enable	should the clocks of the conflict handler be enabled?

Definition at line 1548 of file conflict_graphanalysis.c.

References SCIP_Conflicthdlr::conflicttime, NULL, SCIPclockEnableOrDisable(), and SCIP_Conflicthdlr::setuptime.

SCIPconflictGraphApplicable()

SCIP_Bool SCIPconflictGraphApplicable

(

SCIP_SET *

set

)

return TRUE if conflict graph analysis is applicable

Parameters

set	global SCIP settings

Definition at line 1580 of file conflict_graphanalysis.c.

References FALSE, and TRUE.

Referenced by SCIPconflictAnalyze(), and SCIPconflictAnalyzeRemainingBdchgs().

conflictEnsureTmpbdchginfosMem()

static SCIP_RETCODE conflictEnsureTmpbdchginfosMem ( SCIP_CONFLICT *  conflict, SCIP_SET *  set, int  num  )

static

resizes the array of the temporary bound change informations to be able to store at least num bound change entries

Parameters

conflict	conflict analysis data
set	global SCIP settings
num	minimal number of slots in arrays

Definition at line 1597 of file conflict_graphanalysis.c.

References BMSreallocMemoryArray, NULL, SCIP_ALLOC, SCIP_OKAY, SCIPsetCalcMemGrowSize(), SCIP_Conflict::tmpbdchginfos, and SCIP_Conflict::tmpbdchginfossize.

Referenced by conflictCreateTmpBdchginfo().

conflictCreateTmpBdchginfo()

SCIP_RETCODE conflictCreateTmpBdchginfo	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_VAR *	var,
		SCIP_BOUNDTYPE	boundtype,
		SCIP_Real	oldbound,
		SCIP_Real	newbound,
		SCIP_BDCHGINFO **	bdchginfo
	)

creates a temporary bound change information object that is destroyed after the conflict sets are flushed

Parameters

conflict	conflict analysis data
blkmem	block memory
set	global SCIP settings
var	active variable that changed the bounds
boundtype	type of bound for var: lower or upper bound
oldbound	old value for bound
newbound	new value for bound
bdchginfo	pointer to store bound change information

Definition at line 1620 of file conflict_graphanalysis.c.

References conflictEnsureTmpbdchginfosMem(), SCIP_Conflict::ntmpbdchginfos, NULL, SCIP_CALL, SCIP_OKAY, SCIPbdchginfoCreate(), and SCIP_Conflict::tmpbdchginfos.

Referenced by conflictCreateReconvergenceConss(), and SCIPconflictAnalyzeRemainingBdchgs().

conflictFreeTmpBdchginfos()

static void conflictFreeTmpBdchginfos ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem  )

static

frees all temporarily created bound change information data

Parameters

conflict	conflict analysis data
blkmem	block memory

Definition at line 1644 of file conflict_graphanalysis.c.

References SCIP_Conflict::ntmpbdchginfos, NULL, SCIPbdchginfoFree(), and SCIP_Conflict::tmpbdchginfos.

Referenced by SCIPconflictFlushConss().

incVSIDS()

static SCIP_RETCODE incVSIDS ( SCIP_VAR *  var, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_BOUNDTYPE  boundtype, SCIP_Real  value, SCIP_Real  weight  )

static

increases the conflict score of the variable in the given direction

Parameters

var	problem variable
blkmem	block memory
set	global SCIP settings
stat	dynamic problem statistics
boundtype	type of bound for which the score should be increased
value	value of the bound
weight	weight of this VSIDS updates

Definition at line 1660 of file conflict_graphanalysis.c.

References SCIP_Stat::glbhistory, SCIP_Stat::glbhistorycrun, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, SCIP_CALL, SCIP_OKAY, SCIPhistoryIncVSIDS(), SCIPsetIsZero(), SCIPvarIncVSIDS(), and SCIP_Stat::vsidsweight.

Referenced by conflictAddBound(), SCIPconflictAnalyzeRemainingBdchgs(), and updateStatistics().

updateStatistics()

static SCIP_RETCODE updateStatistics ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_CONFLICTSET *  conflictset, int  insertdepth  )

static

update conflict statistics

Parameters

conflict	conflict analysis data
blkmem	block memory
set	global SCIP settings
stat	dynamic problem statistics
conflictset	conflict set to add to the tree
insertdepth	depth level at which the conflict set should be added

Definition at line 1691 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, bound, SCIP_Stat::glbhistory, SCIP_Stat::glbhistorycrun, incVSIDS(), SCIP_Conflict::nappliedglbconss, SCIP_Conflict::nappliedglbliterals, SCIP_Conflict::nappliedlocconss, SCIP_Conflict::nappliedlocliterals, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_BOUNDTYPE_LOWER, SCIP_BRANCHDIR_DOWNWARDS, SCIP_BRANCHDIR_UPWARDS, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPhistoryIncNActiveConflicts(), SCIPvarIncNActiveConflicts(), and SCIP_BdChgInfo::var.

Referenced by conflictAddConflictCons().

conflictAddConflictCons()

static SCIP_RETCODE conflictAddConflictCons ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_PROB *  transprob, SCIP_PROB *  origprob, SCIP_TREE *  tree, SCIP_REOPT *  reopt, SCIP_LP *  lp, SCIP_BRANCHCAND *  branchcand, SCIP_EVENTQUEUE *  eventqueue, SCIP_EVENTFILTER *  eventfilter, SCIP_CLIQUETABLE *  cliquetable, SCIP_CONFLICTSET *  conflictset, int  insertdepth, SCIP_Bool *  success  )

static

adds the given conflict set as conflict constraint to the problem

Parameters

conflict	conflict analysis data
blkmem	block memory
set	global SCIP settings
stat	dynamic problem statistics
transprob	transformed problem after presolve
origprob	original problem
tree	branch and bound tree
reopt	reoptimization data structure
lp	current LP data
branchcand	branching candidate storage
eventqueue	event queue
eventfilter	global event filter
cliquetable	clique table data structure
conflictset	conflict set to add to the tree
insertdepth	depth level at which the conflict set should be added
success	pointer to store whether the addition was successful

Definition at line 1742 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, bound, SCIP_BdChgInfo::boundtype, SCIP_ConflictSet::conflictdepth, conflictsetPrint(), SCIP_ConflictSet::conflicttype, detectImpliedBounds(), SCIP_Conflict::dIBclock, SCIP_Lp::diving, FALSE, h, SCIP_ConflictSet::hasrelaxonlyvar, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_Tree::path, SCIP_ConflictSet::relaxedbds, SCIP_Tree::root, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_CONFTYPE_UNKNOWN, SCIP_CONSADDED, SCIP_OKAY, SCIP_Real, SCIPboundtypeOpposite(), SCIPclockStart(), SCIPclockStop(), SCIPconflicthdlrExec(), SCIPconflicthdlrGetName(), SCIPconflicthdlrGetPriority(), SCIPdebugCheckConflict, SCIPnodeAddBoundchg(), SCIPsetDebugMsg, SCIPsetIsIntegral(), SCIPsetSortConflicthdlrs(), SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), SCIPvarGetName(), SCIPvarIsIntegral(), SCIP_Lp::strongbranching, TRUE, updateStatistics(), SCIP_ConflictSet::usescutoffbound, SCIP_ConflictSet::validdepth, and SCIP_BdChgInfo::var.

Referenced by SCIPconflictFlushConss().

conflictCalcMaxsize()

int conflictCalcMaxsize	(	SCIP_SET *	set,
		SCIP_PROB *	prob
	)

calculates the maximal size of conflict sets to be used

Parameters

set	global SCIP settings
prob	problem data

Definition at line 1896 of file conflict_graphanalysis.c.

References MAX, SCIP_Prob::ncontvars, NULL, and SCIP_Prob::nvars.

Referenced by SCIPconflictAnalyze(), SCIPconflictAnalyzeRemainingBdchgs(), and SCIPconflictFlushConss().

SCIPconflictFlushConss()

SCIP_RETCODE SCIPconflictFlushConss	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	transprob,
		SCIP_PROB *	origprob,
		SCIP_TREE *	tree,
		SCIP_REOPT *	reopt,
		SCIP_LP *	lp,
		SCIP_BRANCHCAND *	branchcand,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter,
		SCIP_CLIQUETABLE *	cliquetable
	)

adds the collected conflict constraints to the corresponding nodes; the best set->conf_maxconss conflict constraints are added to the node of their validdepth; additionally (if not yet added, and if repropagation is activated), the conflict constraint that triggers the earliest repropagation is added to the node of its validdepth

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	dynamic problem statistics
transprob	transformed problem
origprob	original problem
tree	branch and bound tree
reopt	reoptimization data structure
lp	current LP data
branchcand	branching candidate storage
eventqueue	event queue
eventfilter	global event filter
cliquetable	clique table data structure

Definition at line 1916 of file conflict_graphanalysis.c.

References conflictAddConflictCons(), conflictCalcMaxsize(), SCIP_ConflictSet::conflictdepth, conflictFreeTmpBdchginfos(), conflictsetPrint(), SCIP_Conflict::conflictsets, SCIP_Node::depth, SCIP_ConflictSet::insertdepth, SCIP_ConflictSet::nbdchginfos, SCIP_Conflict::nconflictsets, NULL, SCIP_Tree::path, SCIP_Tree::pathlen, SCIP_ConflictSet::repropagate, SCIP_ConflictSet::repropdepth, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPconflictsetFree(), SCIPdebug, SCIPdebugPrintf, SCIPnodeCutoff(), SCIPnodePropagateAgain(), SCIPsetDebugMsg, SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), SCIPvisualFoundConflict(), SCIP_ConflictSet::validdepth, and SCIP_Stat::visual.

Referenced by conflictAnalyzeLP(), SCIPconflictAnalyzePseudo(), SCIPpropagateDomains(), and solveNode().

conflictEnsureConflictsetsMem()

static SCIP_RETCODE conflictEnsureConflictsetsMem ( SCIP_CONFLICT *  conflict, SCIP_SET *  set, int  num  )

static

resizes conflictsets array to be able to store at least num entries

Parameters

conflict	conflict analysis data
set	global SCIP settings
num	minimal number of slots in array

Definition at line 2127 of file conflict_graphanalysis.c.

References BMSreallocMemoryArray, SCIP_Conflict::conflictsets, SCIP_Conflict::conflictsetscores, SCIP_Conflict::conflictsetssize, NULL, SCIP_ALLOC, SCIP_OKAY, and SCIPsetCalcMemGrowSize().

Referenced by conflictInsertConflictset().

conflictInsertConflictset()

static SCIP_RETCODE conflictInsertConflictset ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_CONFLICTSET **  conflictset  )

static

inserts conflict set into sorted conflictsets array and deletes the conflict set pointer

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
conflictset	pointer to conflict set to insert

Definition at line 2152 of file conflict_graphanalysis.c.

References conflictEnsureConflictsetsMem(), conflictsetCalcConflictDepth(), conflictsetCalcScore(), conflictsetIsRedundant(), conflictsetPrint(), SCIP_Conflict::conflictsets, SCIP_Conflict::conflictsetscores, MIN, SCIP_Conflict::nconflictsets, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPconflictsetFree(), SCIPdebug, and SCIPsetDebugMsg.

Referenced by conflictAddConflictset().

conflictMarkBoundCheckPresence()

static SCIP_Bool conflictMarkBoundCheckPresence ( SCIP_CONFLICT *  conflict, SCIP_SET *  set, SCIP_BDCHGINFO *  bdchginfo, SCIP_Real  relaxedbd  )

static

marks bound to be present in the current conflict and returns whether a bound which is at least as tight was already member of the current conflict (i.e., the given bound change does not need to be added)

Parameters

conflict	conflict analysis data
set	global SCIP settings
bdchginfo	bound change to add to the conflict set
relaxedbd	relaxed bound

Definition at line 2248 of file conflict_graphanalysis.c.

References SCIP_Var::conflictlb, SCIP_Var::conflictlbcount, SCIP_Var::conflictrelaxedlb, SCIP_Var::conflictrelaxedub, SCIP_Var::conflictub, SCIP_Var::conflictubcount, SCIP_Conflict::count, FALSE, MAX, MIN, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_Real, SCIPABORT, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPerrorMessage, SCIPsetDebugMsg, SCIPvarGetName(), and TRUE.

Referenced by conflictAddConflictBound(), and conflictQueueBound().

betterBoundInResolutionQueue()

static SCIP_Bool betterBoundInResolutionQueue ( SCIP_CONFLICT *  conflict, SCIP_SET *  set, SCIP_BDCHGINFO *  bdchginfo  )

static

marks bound to be present in the current conflict and returns whether a bound which is at least as tight was already member of the current conflict (i.e., the given bound change does not need to be added)

Parameters

conflict	conflict analysis data
set	global SCIP settings
bdchginfo	bound change to add to the conflict set

Definition at line 2338 of file conflict_graphanalysis.c.

References SCIP_Conflict::conflictvarslbs, SCIP_Conflict::conflictvarsubs, FALSE, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_Real, SCIPABORT, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPerrorMessage, SCIPsetDebugMsg, SCIPvarGetName(), SCIPvarGetProbindex(), and TRUE.

Referenced by conflictQueueBound().

conflictAddConflictBound()

static SCIP_RETCODE conflictAddConflictBound ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_BDCHGINFO *  bdchginfo, SCIP_Real  relaxedbd  )

static

puts bound change into the current conflict set

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
bdchginfo	bound change to add to the conflict set
relaxedbd	relaxed bound

Definition at line 2387 of file conflict_graphanalysis.c.

References conflictMarkBoundCheckPresence(), SCIP_Conflict::conflictset, conflictsetAddBound(), NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPsetDebugMsg, SCIPsetIsGE(), SCIPsetIsLE(), and SCIPvarGetName().

Referenced by conflictAnalyze(), conflictCreateReconvergenceConss(), and SCIPconflictAnalyzeRemainingBdchgs().

isBoundchgUseless()

static SCIP_Bool isBoundchgUseless ( SCIP_SET *  set, SCIP_BDCHGINFO *  bdchginfo  )

static

returns whether the negation of the given bound change would lead to a globally valid literal

Parameters

set	global SCIP settings
bdchginfo	bound change information

Definition at line 2430 of file conflict_graphanalysis.c.

References bound, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPsetIsFeasGE(), SCIPsetIsFeasLE(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), and SCIPvarIsIntegral().

Referenced by conflictQueueBound().

conflictQueueBound()

static SCIP_RETCODE conflictQueueBound ( SCIP_CONFLICT *  conflict, SCIP_SET *  set, SCIP_BDCHGINFO *  bdchginfo, SCIP_Real  relaxedbd, SCIP_Bool *  success  )

static

adds given bound change information to the conflict candidate queue

Parameters

conflict	conflict analysis data
set	global SCIP settings
bdchginfo	bound change information
relaxedbd	relaxed bound
success	was the bound change successfully added to the queue?

Definition at line 2450 of file conflict_graphanalysis.c.

References SCIP_Conflict::bdchgonlyconfqueue, SCIP_Conflict::bdchgonlyresqueue, SCIP_Conflict::bdchgqueue, betterBoundInResolutionQueue(), conflictMarkBoundCheckPresence(), FALSE, SCIP_Conflict::forcedbdchgqueue, isBoundchgUseless(), NULL, SCIP_Conflict::resbdchgqueue, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPpqueueInsert(), SCIPsetIsGE(), SCIPsetIsLE(), SCIPvarIsBinary(), and TRUE.

Referenced by conflictAddBound(), and conflictCreateReconvergenceConss().

conflictAddBound()

static SCIP_RETCODE conflictAddBound ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_VAR *  var, SCIP_BOUNDTYPE  boundtype, SCIP_BDCHGINFO *  bdchginfo, SCIP_Real  relaxedbd  )

static

adds variable's bound to conflict candidate queue

Parameters

conflict	conflict analysis data
blkmem	block memory
set	global SCIP settings
stat	dynamic problem statistics
var	problem variable
boundtype	type of bound that was changed: lower or upper bound
bdchginfo	bound change info, or NULL
relaxedbd	relaxed bound

Definition at line 2514 of file conflict_graphanalysis.c.

References conflictQueueBound(), incVSIDS(), NULL, SCIP_Bool, SCIP_BOUNDCHGTYPE_BRANCHING, SCIP_BOUNDCHGTYPE_CONSINFER, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_OKAY, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetChgtype(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetInferCons(), SCIPbdchginfoGetInferInfo(), SCIPbdchginfoGetInferProp(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetOldbound(), SCIPbdchginfoGetPos(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPconsGetName(), SCIPpropGetName(), SCIPsetDebugMsg, SCIPsetIsGE(), SCIPsetIsGT(), SCIPsetIsLE(), SCIPsetIsLT(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetType(), and SCIPvarIsActive().

Referenced by SCIPconflictAddBound(), SCIPconflictAddRelaxedBound(), and SCIPconflictAnalyzeRemainingBdchgs().

SCIPconflictAnalyzeRemainingBdchgs()

SCIP_RETCODE SCIPconflictAnalyzeRemainingBdchgs	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	prob,
		SCIP_TREE *	tree,
		SCIP_Bool	diving,
		int *	lbchginfoposs,
		int *	ubchginfoposs,
		int *	nconss,
		int *	nliterals,
		int *	nreconvconss,
		int *	nreconvliterals
	)

applies conflict analysis starting with given bound changes, that could not be undone during previous infeasibility analysis

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
prob	problem data
tree	branch and bound tree
diving	are we in strong branching or diving mode?
lbchginfoposs	positions of currently active lower bound change information in variables' arrays
ubchginfoposs	positions of currently active upper bound change information in variables' arrays
nconss	pointer to store the number of generated conflict constraints
nliterals	pointer to store the number of literals in generated conflict constraints
nreconvconss	pointer to store the number of generated reconvergence constraints
nreconvliterals	pointer to store the number of literals generated reconvergence constraints

Definition at line 2575 of file conflict_graphanalysis.c.

References conflictAddBound(), conflictAddConflictBound(), conflictAnalyze(), conflictCalcMaxsize(), conflictCreateTmpBdchginfo(), SCIP_Conflict::conflictset, SCIP_ConflictSet::conflicttype, FALSE, incVSIDS(), SCIP_Var::lbchginfos, SCIP_Var::nlbchginfos, SCIP_Var::nubchginfos, NULL, SCIP_Prob::nvars, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoIsRedundant(), SCIPconflictGraphApplicable(), SCIPconflictInit(), SCIPsetDebugMsg, SCIPvarGetLbLocal(), SCIPvarGetLbLP(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarGetUbLocal(), SCIPvarGetUbLP(), SCIP_Var::ubchginfos, SCIP_ConflictSet::usescutoffbound, and SCIP_Prob::vars.

Referenced by conflictAnalyzeLP(), and SCIPconflictAnalyzePseudo().

bdchginfoIsInvalid()

SCIP_Bool bdchginfoIsInvalid	(	SCIP_CONFLICT *	conflict,
		SCIP_BDCHGINFO *	bdchginfo
	)

check if the bound change info (which is the potential next candidate which is queued) is valid for the current conflict analysis; a bound change info can get invalid if after this one was added to the queue, a weaker bound change was added to the queue (due the bound widening idea) which immediately makes this bound change redundant; due to the priority we did not removed that bound change info since that cost O(log(n)); hence we have to skip/ignore it now

The following situations can occur before for example the bound change info (x >= 3) is potentially popped from the queue.

Postcondition: the reason why (x >= 3) was queued is that at this time point no lower bound of x was involved yet in the current conflict or the lower bound which was involved until then was stronger, e.g., (x >= 2).

1) during the time until (x >= 3) gets potentially popped no weaker lower bound was added to the queue, in that case the conflictlbcount is valid and conflictlb is 3; that is (var->conflictlbcount == conflict->count && var->conflictlb == 3)

2) a weaker bound change info gets queued (e.g., x >= 4); this bound change is popped before (x >= 3) since it has higher priority (which is the time stamp of the bound change info and (x >= 4) has to be done after (x >= 3) during propagation or branching)

a) if (x >= 4) is popped and added to the conflict set the conflictlbcount is still valid and conflictlb is at most 4; that is (var->conflictlbcount == conflict->count && var->conflictlb >= 4); it follows that any bound change info which is stronger than (x >= 4) gets ignored (for example x >= 2)

b) if (x >= 4) is popped and resolved without introducing a new lower bound on x until (x >= 3) is a potentially candidate the conflictlbcount indicates that bound change is currently not present; that is (var->conflictlbcount != conflict->count)

c) if (x >= 4) is popped and resolved and a new lower bound on x (e.g., x >= 2) is introduced until (x >= 3) is pooped, the conflictlbcount indicates that bound change is currently present; that is (var->conflictlbcount == conflict->count); however the (x >= 3) only has be explained if conflictlb matches that one; that is (var->conflictlb == bdchginfo->newbound); otherwise it redundant/invalid.

Parameters

conflict	conflict analysis data
bdchginfo	bound change information

Definition at line 2749 of file conflict_graphanalysis.c.

References SCIP_Var::conflictlb, SCIP_Var::conflictlbcount, SCIP_Var::conflictub, SCIP_Var::conflictubcount, SCIP_Conflict::count, FALSE, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPvarIsBinary(), and TRUE.

Referenced by conflictFirstCand(), conflictRemoveCand(), conflictResolveBound(), and conflictsetAddBounds().

conflictsetAddBounds()

static SCIP_RETCODE conflictsetAddBounds ( SCIP_CONFLICT *  conflict, SCIP_CONFLICTSET *  conflictset, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_BDCHGINFO **  bdchginfos, int  nbdchginfos  )

static

adds given bound changes to a conflict set

Parameters

conflict	conflict analysis data
conflictset	conflict set
blkmem	block memory of transformed problem
set	global SCIP settings
bdchginfos	bound changes to add to the conflict set
nbdchginfos	number of bound changes to add

Definition at line 2792 of file conflict_graphanalysis.c.

References bdchginfoIsInvalid(), SCIP_ConflictSet::bdchginfos, conflictsetAddBound(), conflictsetEnsureBdchginfosMem(), FALSE, SCIP_ConflictSet::hasrelaxonlyvar, MAX, MIN, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetRelaxedBound(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsTighter(), SCIPsetDebugMsg, SCIPsortIntPtrReal(), SCIPvarGetIndex(), SCIPvarGetName(), SCIPvarIsRelaxationOnly(), SCIP_ConflictSet::sortvals, and TRUE.

Referenced by conflictAddConflictset().

conflictRemoveCand()

static SCIP_BDCHGINFO * conflictRemoveCand ( SCIP_CONFLICT *  conflict )

static

removes and returns next conflict analysis candidate from the candidate queue

Parameters

conflict

conflict analysis data

Definition at line 2961 of file conflict_graphanalysis.c.

References bdchginfoIsInvalid(), SCIP_Conflict::bdchgqueue, SCIP_Var::conflictlbcount, SCIP_Var::conflictrelaxedlb, SCIP_Var::conflictrelaxedub, SCIP_Var::conflictubcount, SCIP_Conflict::forcedbdchgqueue, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_REAL_MAX, SCIP_REAL_MIN, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPpqueueNElems(), and SCIPpqueueRemove().

Referenced by conflictAnalyze(), and conflictCreateReconvergenceConss().

conflictFirstCand()

static SCIP_BDCHGINFO * conflictFirstCand ( SCIP_CONFLICT *  conflict )

static

returns next conflict analysis candidate from the candidate queue without removing it

Parameters

conflict

conflict analysis data

Definition at line 3005 of file conflict_graphanalysis.c.

References bdchginfoIsInvalid(), SCIP_Conflict::bdchgqueue, conflictFirstCand(), SCIP_Conflict::forcedbdchgqueue, NULL, SCIP_BOUNDTYPE_LOWER, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPdebugMessage, SCIPpqueueFirst(), SCIPpqueueNElems(), SCIPpqueueRemove(), and SCIPvarGetName().

Referenced by conflictAnalyze(), conflictCreateReconvergenceConss(), and conflictFirstCand().

conflictAddConflictset()

static SCIP_RETCODE conflictAddConflictset ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_TREE *  tree, int  validdepth, SCIP_Bool  diving, SCIP_Bool  repropagate, SCIP_Bool *  success, int *  nliterals  )

static

adds the current conflict set (extended by all remaining bound changes in the queue) to the pool of conflict sets

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	dynamic problem statistics
tree	branch and bound tree
validdepth	minimal depth level at which the conflict set is valid
diving	are we in strong branching or diving mode?
repropagate	should the constraint trigger a repropagation?
success	pointer to store whether the conflict set is valid
nliterals	pointer to store the number of literals in the generated conflictset

Definition at line 3059 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, conflictInsertConflictset(), SCIP_Conflict::conflictset, conflictsetAddBounds(), conflictsetCalcInsertDepth(), conflictsetCopy(), FALSE, SCIP_Conflict::forcedbdchgqueue, SCIP_ConflictSet::insertdepth, MAX, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_Tree::path, SCIP_Tree::pathlen, SCIP_ConflictSet::relaxedbds, SCIP_ConflictSet::repropagate, SCIP_CALL, SCIP_OKAY, SCIPconflictsetFree(), SCIPdebugCheckConflict, SCIPpqueueElems(), SCIPpqueueNElems(), SCIPsetDebugMsg, SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), TRUE, and SCIP_ConflictSet::validdepth.

Referenced by conflictAnalyze(), and conflictCreateReconvergenceConss().

conflictResolveBound()

static SCIP_RETCODE conflictResolveBound ( SCIP_CONFLICT *  conflict, SCIP_SET *  set, SCIP_BDCHGINFO *  bdchginfo, SCIP_Real  relaxedbd, int  validdepth, SCIP_Bool *  resolved  )

static

tries to resolve given bound change

• resolutions on local constraints are only applied, if the constraint is valid at the current minimal valid depth level, because this depth level is the topmost level to add the conflict constraint to anyways

Note

it is sufficient to explain the relaxed bound change

Parameters

conflict	conflict analysis data
set	global SCIP settings
bdchginfo	bound change to resolve
relaxedbd	the relaxed bound
validdepth	minimal depth level at which the conflict is valid
resolved	pointer to store whether the bound change was resolved

Definition at line 3158 of file conflict_graphanalysis.c.

References bdchginfoIsInvalid(), SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, SCIP_Conflict::conflictset, FALSE, SCIP_Conflict::forcedbdchgqueue, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_BOUNDCHGTYPE_BRANCHING, SCIP_BOUNDCHGTYPE_CONSINFER, SCIP_BOUNDCHGTYPE_PROPINFER, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIP_VARSTATUS_AGGREGATED, SCIP_VARSTATUS_MULTAGGR, SCIP_VARSTATUS_NEGATED, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetChgtype(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetIdx(), SCIPbdchginfoGetInferBoundtype(), SCIPbdchginfoGetInferCons(), SCIPbdchginfoGetInferInfo(), SCIPbdchginfoGetInferProp(), SCIPbdchginfoGetInferVar(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetPos(), SCIPbdchginfoGetRelaxedBound(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPconsGetName(), SCIPconsGetValidDepth(), SCIPconsIsGlobal(), SCIPconsResolvePropagation(), SCIPerrorMessage, SCIPgetVarBdAtIndex(), SCIPpqueueElems(), SCIPpqueueNElems(), SCIPpropGetName(), SCIPpropResolvePropagation(), SCIPsetDebugMsg, SCIPsetDebugMsgPrint, SCIPvarGetMultaggrNVars(), SCIPvarGetName(), SCIPvarGetProbvarSum(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarIsActive(), and TRUE.

Referenced by conflictAnalyze(), and conflictCreateReconvergenceConss().

conflictClear()

static void conflictClear ( SCIP_CONFLICT *  conflict )

static

clears the conflict queue and the current conflict set

Parameters

conflict

conflict analysis data

Definition at line 3368 of file conflict_graphanalysis.c.

References SCIP_Conflict::bdchgqueue, SCIP_Conflict::conflictset, conflictsetClear(), SCIP_Conflict::forcedbdchgqueue, NULL, and SCIPpqueueClear().

Referenced by conflictAnalyze(), conflictCreateReconvergenceConss(), and SCIPconflictInit().

conflictClearResolution()

static void conflictClearResolution ( SCIP_CONFLICT *  conflict, SCIP_SET *  set, SCIP_PROB *  prob  )

static

clears the resolution conflict analysis queues and the bounds leading to conflict

Parameters

conflict	conflict analysis data
set	global SCIP settings
prob	problem data

Definition at line 3382 of file conflict_graphanalysis.c.

References BMSreallocMemoryArray, SCIP_Conflict::conflictprobnvars, SCIP_Conflict::conflictvarslbs, SCIP_Conflict::conflictvarsubs, NULL, SCIP_Conflict::resbdchgqueue, SCIP_REAL_MAX, SCIP_REAL_MIN, SCIPpqueueClear(), and SCIPprobGetNVars().

Referenced by SCIPconflictInit().

SCIPconflictInit()

SCIP_RETCODE SCIPconflictInit	(	SCIP_CONFLICT *	conflict,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	prob,
		SCIP_CONFTYPE	conftype,
		SCIP_Bool	usescutoffbound
	)

initializes propagation and resolution conflict analysis by clearing the conflict candidate queues

Parameters

conflict	conflict analysis data
set	global SCIP settings
stat	problem statistics
prob	problem data
conftype	type of the conflict
usescutoffbound	depends the conflict on a cutoff bound?

Definition at line 3420 of file conflict_graphanalysis.c.

References conflictClear(), conflictClearResolution(), SCIP_Conflict::conflictrow, SCIP_Conflict::conflictset, SCIP_ConflictSet::conflicttype, SCIP_ConflictRow::conflicttype, SCIP_Conflict::count, SCIP_Stat::glbhistory, SCIP_Stat::glbhistorycrun, SCIP_Stat::lastconflictnode, SCIP_Stat::nnodes, NULL, SCIP_Prob::nvars, SCIP_CALL, SCIP_CONFTYPE_BNDEXCEEDING, SCIP_CONFTYPE_INFEASLP, SCIP_CONFTYPE_PROPAGATION, SCIP_OKAY, SCIPhistoryScaleVSIDS(), SCIPsetDebugMsg, SCIPvarScaleVSIDS(), SCIP_ConflictSet::usescutoffbound, SCIP_Prob::vars, and SCIP_Stat::vsidsweight.

Referenced by conflictCreateReconvergenceConss(), SCIPconflictAnalyzeRemainingBdchgs(), and SCIPinitConflictAnalysis().

convertToActiveVar()

static SCIP_RETCODE convertToActiveVar ( SCIP_VAR **  var, SCIP_SET *  set, SCIP_BOUNDTYPE *  boundtype, SCIP_Real *  bound  )

static

convert variable and bound change to active variable

Parameters

var	pointer to variable
set	global SCIP settings
boundtype	pointer to type of bound that was changed: lower or upper bound
bound	pointer to bound to convert, or NULL

Definition at line 3491 of file conflict_graphanalysis.c.

References bound, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_FIXED, SCIPboundtypeOpposite(), SCIPvarGetProbvarSum(), and SCIPvarGetStatus().

Referenced by SCIPconflictAddBound(), SCIPconflictAddRelaxedBound(), and SCIPconflictIsVarUsed().

bdchginfoIsResolvable()

static SCIP_Bool bdchginfoIsResolvable ( SCIP_BDCHGINFO *  bdchginfo )

static

returns whether bound change has a valid reason that can be resolved in conflict analysis

Parameters

bdchginfo

bound change information

Definition at line 3526 of file conflict_graphanalysis.c.

References NULL, SCIP_BOUNDCHGTYPE_CONSINFER, SCIP_BOUNDCHGTYPE_PROPINFER, SCIPbdchginfoGetChgtype(), SCIPbdchginfoGetInferProp(), and SCIPbdchginfoIsRedundant().

Referenced by addCand(), and conflictCreateReconvergenceConss().

conflictCreateReconvergenceConss()

static SCIP_RETCODE conflictCreateReconvergenceConss ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_PROB *  prob, SCIP_TREE *  tree, SCIP_Bool  diving, int  validdepth, SCIP_BDCHGINFO *  firstuip, int *  nreconvconss, int *  nreconvliterals  )

static

if only one conflicting bound change of the last depth level was used, and if this can be resolved, creates GRASP-like reconvergence conflict constraints in the conflict graph up to the branching variable of this depth level

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
prob	problem data
tree	branch and bound tree
diving	are we in strong branching or diving mode?
validdepth	minimal depth level at which the initial conflict set is valid
firstuip	first UIP of conflict graph
nreconvconss	pointer to store the number of generated reconvergence constraints
nreconvliterals	pointer to store the number of literals generated reconvergence constraints

Definition at line 3544 of file conflict_graphanalysis.c.

References bdchginfoIsResolvable(), SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, conflictAddConflictBound(), conflictAddConflictset(), conflictClear(), conflictCreateTmpBdchginfo(), conflictFirstCand(), conflictQueueBound(), conflictRemoveCand(), conflictResolveBound(), SCIP_Conflict::conflictset, SCIP_ConflictSet::conflicttype, FALSE, SCIP_Conflict::forcedbdchgqueue, MIN, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_Tree::path, SCIP_Tree::pathlen, SCIP_ConflictSet::relaxedbds, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_REAL_MAX, SCIP_REAL_MIN, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetPos(), SCIPbdchginfoGetRelaxedBound(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPboundtypeOpposite(), SCIPconflictInit(), SCIPdebugCheckConflictFrontier, SCIPpqueueNElems(), SCIPsetDebugMsg, SCIPsetIsIntegral(), SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), SCIPvarGetName(), SCIPvarIsActive(), SCIPvarIsIntegral(), and SCIP_ConflictSet::usescutoffbound.

Referenced by conflictAnalyze().

conflictAnalyze()

SCIP_RETCODE conflictAnalyze	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	prob,
		SCIP_TREE *	tree,
		SCIP_Bool	diving,
		int	validdepth,
		SCIP_Bool	mustresolve,
		int *	nconss,
		int *	nliterals,
		int *	nreconvconss,
		int *	nreconvliterals
	)

analyzes conflicting bound changes that were added with calls to SCIPconflictAddBound() and SCIPconflictAddRelaxedBound(), and on success, calls the conflict handlers to create a conflict constraint out of the resulting conflict set; afterwards the conflict queue and the conflict set is cleared

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
prob	problem data
tree	branch and bound tree
diving	are we in strong branching or diving mode?
validdepth	minimal depth level at which the initial conflict set is valid
mustresolve	should the conflict set only be used, if a resolution was applied?
nconss	pointer to store the number of generated conflict constraints
nliterals	pointer to store the number of literals in generated conflict constraints
nreconvconss	pointer to store the number of generated reconvergence constraints
nreconvliterals	pointer to store the number of literals generated reconvergence constraints

Definition at line 3780 of file conflict_graphanalysis.c.

References SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, SCIP_DomChgBound::boundchgs, conflictAddConflictBound(), conflictAddConflictset(), conflictClear(), conflictCreateReconvergenceConss(), conflictFirstCand(), conflictRemoveCand(), conflictResolveBound(), SCIP_Conflict::conflictset, SCIP_ConflictSet::conflicttype, SCIP_Node::domchg, SCIP_DomChg::domchgbound, FALSE, SCIP_Conflict::forcedbdchgqueue, MIN, SCIP_ConflictSet::nbdchginfos, SCIP_DomChgBound::nboundchgs, NULL, SCIP_Tree::path, SCIP_Tree::pathlen, SCIP_ConflictSet::relaxedbds, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetPos(), SCIPbdchginfoGetRelaxedBound(), SCIPbdchginfoGetVar(), SCIPbdchginfoHasInferenceReason(), SCIPbdchginfoIsRedundant(), SCIPdebugCheckConflictFrontier, SCIPpqueueNElems(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetUbGlobal(), SCIPvarIsActive(), and TRUE.

Referenced by SCIPconflictAnalyze(), and SCIPconflictAnalyzeRemainingBdchgs().

calcBdchgScore()

static SCIP_Real calcBdchgScore ( SCIP_Real  prooflhs, SCIP_Real  proofact, SCIP_Real  proofactdelta, SCIP_Real  proofcoef, int  depth, int  currentdepth, SCIP_VAR *  var, SCIP_SET *  set  )

static

calculates the score of a bound change within a conflict

Parameters

prooflhs	lhs of proof constraint
proofact	activity of the proof constraint
proofactdelta	activity change
proofcoef	coefficient in proof constraint
depth	bound change depth
currentdepth	current depth
var	variable corresponding to bound change
set	global SCIP settings

Definition at line 4065 of file conflict_graphanalysis.c.

References MAX, NULL, SCIP_LOCKTYPE_MODEL, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPcolGetNNonz(), SCIPvarGetCol(), SCIPvarGetNLocksDownType(), SCIPvarGetNLocksUpType(), and SCIPvarGetStatus().

Referenced by addCand().

ensureCandsSize()

static SCIP_RETCODE ensureCandsSize ( SCIP_SET *  set, SCIP_VAR ***  cands, SCIP_Real **  candscores, SCIP_Real **  newbounds, SCIP_Real **  proofactdeltas, int *  candssize, int  num  )

static

ensures, that candidate array can store at least num entries

Parameters

set	global SCIP settings
cands	pointer to candidate array
candscores	pointer to candidate score array
newbounds	pointer to candidate new bounds array
proofactdeltas	pointer to candidate proof delta array
candssize	pointer to size of array
num	minimal number of candidates to store in array

Definition at line 4110 of file conflict_graphanalysis.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPsetCalcMemGrowSize(), and SCIPsetReallocBufferArray.

Referenced by addCand().

skipRedundantBdchginfos()

static void skipRedundantBdchginfos ( SCIP_VAR *  var, int *  lbchginfopos, int *  ubchginfopos  )

static

after changing the global bound of a variable, the bdchginfos that are now redundant are replaced with oldbound = newbound = global bound; if the current bdchginfo is of such kind, the bound is equal to the global bound and we can ignore it by installing a -1 as the corresponding bound change info position

Parameters

var	problem variable
lbchginfopos	pointer to lower bound change information position
ubchginfopos	pointer to upper bound change information position

Definition at line 4144 of file conflict_graphanalysis.c.

References SCIP_Var::lbchginfos, SCIP_BdChgInfo::newbound, SCIP_Var::nlbchginfos, SCIP_Var::nubchginfos, NULL, SCIP_BdChgInfo::oldbound, SCIP_BdChgInfo::redundant, SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), and SCIP_Var::ubchginfos.

Referenced by SCIPundoBdchgsProof().

SCIPconflictAddBound()

SCIP_RETCODE SCIPconflictAddBound	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_VAR *	var,
		SCIP_BOUNDTYPE	boundtype,
		SCIP_BDCHGIDX *	bdchgidx
	)

adds variable's bound to conflict candidate queue

Parameters

conflict	conflict analysis data
blkmem	block memory
set	global SCIP settings
stat	dynamic problem statistics
var	problem variable
boundtype	type of bound that was changed: lower or upper bound
bdchgidx	bound change index (time stamp of bound change), or NULL for current time

Definition at line 4175 of file conflict_graphanalysis.c.

References conflictAddBound(), convertToActiveVar(), FALSE, NULL, scalars, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_FIXED, SCIP_VARSTATUS_MULTAGGR, SCIPbdchgidxIsEarlier(), SCIPbdchginfoGetIdx(), SCIPbdchginfoGetNewbound(), SCIPboundtypeOpposite(), SCIPconflictAddBound(), SCIPvarGetBdchgInfo(), SCIPvarGetMultaggrNVars(), SCIPvarGetMultaggrScalars(), SCIPvarGetMultaggrVars(), SCIPvarGetStatus(), and SCIPvarIsActive().

Referenced by SCIPaddConflictBd(), SCIPaddConflictBinvar(), SCIPaddConflictLb(), SCIPaddConflictUb(), SCIPconflictAddBound(), and SCIPconflictAddRelaxedBound().

SCIPconflictAddRelaxedBound()

SCIP_RETCODE SCIPconflictAddRelaxedBound	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_VAR *	var,
		SCIP_BOUNDTYPE	boundtype,
		SCIP_BDCHGIDX *	bdchgidx,
		SCIP_Real	relaxedbd
	)

adds variable's bound to conflict candidate queue

Parameters

conflict	conflict analysis data
blkmem	block memory
set	global SCIP settings
stat	dynamic problem statistics
var	problem variable
boundtype	type of bound that was changed: lower or upper bound
bdchgidx	bound change index (time stamp of bound change), or NULL for current time
relaxedbd	the relaxed bound

Definition at line 4236 of file conflict_graphanalysis.c.

References SCIP_BdChgInfo::bdchgidx, conflictAddBound(), convertToActiveVar(), FALSE, MAX, MIN, NULL, SCIP_BdChgInfo::pos, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_FIXED, SCIP_VARSTATUS_MULTAGGR, SCIPbdchgidxGetPos(), SCIPbdchgidxIsEarlier(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetIdx(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetOldbound(), SCIPbdchginfoGetPos(), SCIPbdchginfoIsRedundant(), SCIPconflictAddBound(), SCIPsetDebugMsg, SCIPsetIsGE(), SCIPsetIsGT(), SCIPsetIsLE(), SCIPsetIsLT(), SCIPvarAdjustLb(), SCIPvarAdjustUb(), SCIPvarGetBdchgInfo(), SCIPvarGetBdchgInfoLb(), SCIPvarGetBdchgInfoUb(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), and SCIPvarIsActive().

Referenced by SCIPaddConflictRelaxedBd(), SCIPaddConflictRelaxedLb(), and SCIPaddConflictRelaxedUb().

SCIPconflictIsVarUsed()

SCIP_RETCODE SCIPconflictIsVarUsed	(	SCIP_CONFLICT *	conflict,
		SCIP_VAR *	var,
		SCIP_SET *	set,
		SCIP_BOUNDTYPE	boundtype,
		SCIP_BDCHGIDX *	bdchgidx,
		SCIP_Bool *	used
	)

checks if the given variable is already part of the current conflict set or queued for resolving with the same or even stronger bound

Parameters

conflict	conflict analysis data
var	problem variable
set	global SCIP settings
boundtype	type of bound for which the score should be increased
bdchgidx	bound change index (time stamp of bound change), or NULL for current time
used	pointer to store if the variable is already used

Definition at line 4400 of file conflict_graphanalysis.c.

References SCIP_Var::conflictlb, SCIP_Var::conflictlbcount, SCIP_Var::conflictub, SCIP_Var::conflictubcount, convertToActiveVar(), SCIP_Conflict::count, FALSE, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_FIXED, SCIP_VARSTATUS_MULTAGGR, SCIPABORT, SCIPerrorMessage, SCIPgetVarLbAtIndex(), SCIPgetVarUbAtIndex(), SCIPsetDebugMsg, SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarIsActive(), and TRUE.

Referenced by SCIPisConflictVarUsed().

addBdchg()

static SCIP_RETCODE addBdchg ( SCIP_SET *  set, SCIP_VAR *  var, SCIP_Real  newlb, SCIP_Real  newub, SCIP_LPBDCHGS *  oldlpbdchgs, SCIP_LPBDCHGS *  relaxedlpbdchgs, SCIP_LPI *  lpi  )

static

inserts variable's new bounds into bound change arrays

Parameters

set	global SCIP settings
var	variable to change the LP bounds for
newlb	new lower bound
newub	new upper bound
oldlpbdchgs	old LP bound changes used for reset the LP bound change
relaxedlpbdchgs	relaxed LP bound changes used for reset the LP bound change
lpi	pointer to LPi to access infinity of LP solver; necessary to set correct value

Definition at line 4459 of file conflict_graphanalysis.c.

References SCIP_LPBdChgs::bdchgcolinds, SCIP_LPBdChgs::bdchginds, SCIP_LPBdChgs::bdchglbs, SCIP_LPBdChgs::bdchgubs, SCIP_LPBdChgs::nbdchgs, NULL, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIPcolGetLPPos(), SCIPlpiInfinity(), SCIPlpiIsInfinity(), SCIPsetIsEQ(), SCIPsetIsInfinity(), SCIPvarGetCol(), SCIPvarGetLbLP(), SCIPvarGetStatus(), SCIPvarGetUbLP(), TRUE, and SCIP_LPBdChgs::usedcols.

Referenced by SCIPundoBdchgsProof().

addCand()

static SCIP_RETCODE addCand ( SCIP_SET *  set, int  currentdepth, SCIP_VAR *  var, int  lbchginfopos, int  ubchginfopos, SCIP_Real  proofcoef, SCIP_Real  prooflhs, SCIP_Real  proofact, SCIP_VAR ***  cands, SCIP_Real **  candscores, SCIP_Real **  newbounds, SCIP_Real **  proofactdeltas, int *  candssize, int *  ncands, int  firstcand  )

static

adds variable to candidate list, if the current best bound corresponding to the proof coefficient is local; returns the array position in the candidate list, where the new candidate was inserted, or -1 if the variable can relaxed to global bounds immediately without increasing the proof's activity; the candidates are sorted with respect to the following two criteria:

• prefer bound changes that have been applied deeper in the tree, to get a more global conflict
• prefer variables with small Farkas coefficient to get rid of as many bound changes as possible

Parameters

set	global SCIP settings
currentdepth	current depth in the tree
var	variable to add to candidate array
lbchginfopos	positions of currently active lower bound change information in variable's array
ubchginfopos	positions of currently active upper bound change information in variable's array
proofcoef	coefficient of variable in infeasibility/bound proof
prooflhs	left hand side of infeasibility/bound proof
proofact	activity of infeasibility/bound proof row
cands	pointer to candidate array for undoing bound changes
candscores	pointer to candidate score array for undoing bound changes
newbounds	pointer to candidate new bounds array for undoing bound changes
proofactdeltas	pointer to proof activity increase array for undoing bound changes
candssize	pointer to size of cands arrays
ncands	pointer to count number of candidates in bound change list
firstcand	position of first unprocessed bound change candidate

Definition at line 4546 of file conflict_graphanalysis.c.

References SCIP_BdChgInfo::bdchgidx, bdchginfoIsResolvable(), calcBdchgScore(), SCIP_BdChgIdx::depth, ensureCandsSize(), FALSE, SCIP_Var::lbchginfos, SCIP_BdChgInfo::newbound, SCIP_Var::nlbchginfos, SCIP_Var::nubchginfos, NULL, SCIP_BdChgInfo::oldbound, QUAD, QUAD_TO_DBL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPquadprecProdQD, SCIPquadprecSumDD, SCIPsetDebugMsg, SCIPsetIsGT(), SCIPsetIsZero(), SCIPvarGetLbLocal(), SCIPvarGetLbLP(), SCIPvarGetName(), SCIPvarGetUbLocal(), SCIPvarGetUbLP(), SCIPvarIsBinary(), and SCIP_Var::ubchginfos.

Referenced by SCIPundoBdchgsProof().

SCIPundoBdchgsProof()

SCIP_RETCODE SCIPundoBdchgsProof	(	SCIP_SET *	set,
		SCIP_PROB *	prob,
		int	currentdepth,
		SCIP_Real *	proofcoefs,
		SCIP_Real	prooflhs,
		SCIP_Real *	proofact,
		SCIP_Real *	curvarlbs,
		SCIP_Real *	curvarubs,
		int *	lbchginfoposs,
		int *	ubchginfoposs,
		SCIP_LPBDCHGS *	oldlpbdchgs,
		SCIP_LPBDCHGS *	relaxedlpbdchgs,
		SCIP_Bool *	resolve,
		SCIP_LPI *	lpi
	)

undoes bound changes on variables, still leaving the given infeasibility proof valid

Parameters

set	global SCIP settings
prob	problem data
currentdepth	current depth in the tree
proofcoefs	coefficients in infeasibility proof
prooflhs	left hand side of proof
proofact	current activity of proof
curvarlbs	current lower bounds of active problem variables
curvarubs	current upper bounds of active problem variables
lbchginfoposs	positions of currently active lower bound change information in variables' arrays
ubchginfoposs	positions of currently active upper bound change information in variables' arrays
oldlpbdchgs	old LP bound changes used for reset the LP bound change, or NULL
relaxedlpbdchgs	relaxed LP bound changes used for reset the LP bound change, or NULL
resolve	pointer to store whether the changed LP should be resolved again, or NULL
lpi	pointer to LPi to access infinity of LP solver; necessary to set correct values

Definition at line 4678 of file conflict_graphanalysis.c.

References addBdchg(), addCand(), FALSE, NULL, SCIP_Prob::nvars, QUAD, QUAD_TO_DBL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPquadprecProdQD, SCIPquadprecSumDD, SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsEQ(), SCIPsetIsFeasGT(), SCIPsetIsGT(), SCIPsetIsLT(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPsetIsZero(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetProbindex(), SCIPvarGetUbGlobal(), SCIPvarIsInLP(), skipRedundantBdchginfos(), TRUE, and SCIP_Prob::vars.

Referenced by SCIPconflictAnalyzePseudo(), undoBdchgsDualfarkas(), and undoBdchgsDualsol().

undoBdchgsDualfarkas()

static SCIP_RETCODE undoBdchgsDualfarkas ( SCIP_SET *  set, SCIP_PROB *  prob, SCIP_LP *  lp, int  currentdepth, SCIP_Real *  curvarlbs, SCIP_Real *  curvarubs, int *  lbchginfoposs, int *  ubchginfoposs, SCIP_LPBDCHGS *  oldlpbdchgs, SCIP_LPBDCHGS *  relaxedlpbdchgs, SCIP_Bool *  valid, SCIP_Bool *  resolve, SCIP_Real *  farkascoefs, SCIP_Real  farkaslhs, SCIP_Real *  farkasactivity  )

static

analyzes an infeasible LP and undoes additional bound changes while staying infeasible

Parameters

set	global SCIP settings
prob	problem data
lp	LP data
currentdepth	current depth in the tree
curvarlbs	current lower bounds of active problem variables
curvarubs	current upper bounds of active problem variables
lbchginfoposs	positions of currently active lower bound change information in variables' arrays
ubchginfoposs	positions of currently active upper bound change information in variables' arrays
oldlpbdchgs	old LP bound changes used for reset the LP bound change, or NULL
relaxedlpbdchgs	relaxed LP bound changes used for reset the LP bound change, or NULL
valid	pointer to store whether the unfixings are valid
resolve	pointer to store whether the changed LP should be resolved again
farkascoefs	coefficients in the proof constraint
farkaslhs	lhs of the proof constraint
farkasactivity	maximal activity of the proof constraint

Definition at line 4890 of file conflict_graphanalysis.c.

References SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpGetLPI(), SCIPsetDebugMsg, SCIPsetIsFeasGT(), SCIPundoBdchgsProof(), SCIP_Lp::solved, and TRUE.

Referenced by SCIPrunBoundHeuristic().

lpbdchgsCreate()

static SCIP_RETCODE lpbdchgsCreate ( SCIP_LPBDCHGS **  lpbdchgs, SCIP_SET *  set, int  ncols  )

static

create conflict LP bound change data structure

Parameters

lpbdchgs	pointer to store the conflict LP bound change data structure
set	global SCIP settings
ncols	number of columns

Definition at line 4951 of file conflict_graphanalysis.c.

References BMSclearMemoryArray, SCIP_CALL, SCIP_OKAY, SCIPsetAllocBuffer, and SCIPsetAllocBufferArray.

Referenced by SCIPrunBoundHeuristic().

ensureSidechgsSize()

static SCIP_RETCODE ensureSidechgsSize ( SCIP_SET *  set, int **  sidechginds, SCIP_Real **  sidechgoldlhss, SCIP_Real **  sidechgoldrhss, SCIP_Real **  sidechgnewlhss, SCIP_Real **  sidechgnewrhss, int *  sidechgssize, int  num  )

static

ensures, that side change arrays can store at least num entries

Parameters

set	global SCIP settings
sidechginds	pointer to side change index array
sidechgoldlhss	pointer to side change old left hand sides array
sidechgoldrhss	pointer to side change old right hand sides array
sidechgnewlhss	pointer to side change new left hand sides array
sidechgnewrhss	pointer to side change new right hand sides array
sidechgssize	pointer to size of side change arrays
num	minimal number of entries to be able to store in side change arrays

Definition at line 4978 of file conflict_graphanalysis.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPsetCalcMemGrowSize(), and SCIPsetReallocBufferArray.

Referenced by addSideRemoval().

addSideRemoval()

static SCIP_RETCODE addSideRemoval ( SCIP_SET *  set, SCIP_ROW *  row, SCIP_Real  lpiinfinity, int **  sidechginds, SCIP_Real **  sidechgoldlhss, SCIP_Real **  sidechgoldrhss, SCIP_Real **  sidechgnewlhss, SCIP_Real **  sidechgnewrhss, int *  sidechgssize, int *  nsidechgs  )

static

adds removal of row's side to side change arrays; finite sides are only replaced by near infinite sides, such that the row's sense in the LP solver is not changed

Parameters

set	global SCIP settings
row	LP row to change the sides for
lpiinfinity	value treated as infinity in LP solver
sidechginds	pointer to side change index array
sidechgoldlhss	pointer to side change old left hand sides array
sidechgoldrhss	pointer to side change old right hand sides array
sidechgnewlhss	pointer to side change new left hand sides array
sidechgnewrhss	pointer to side change new right hand sides array
sidechgssize	pointer to size of side change arrays
nsidechgs	pointer to number of used slots in side change arrays

Definition at line 5017 of file conflict_graphanalysis.c.

References ensureSidechgsSize(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIProwGetConstant(), SCIProwGetLhs(), SCIProwGetLPPos(), SCIProwGetRhs(), and SCIPsetIsInfinity().

Referenced by SCIPrunBoundHeuristic().

lpbdchgsReset()

static void lpbdchgsReset ( SCIP_LPBDCHGS *  lpbdchgs, int  ncols  )

static

reset conflict LP bound change data structure

Parameters

lpbdchgs	conflict LP bound change data structure
ncols	number of columns

Definition at line 5091 of file conflict_graphanalysis.c.

References BMSclearMemoryArray, SCIP_LPBdChgs::nbdchgs, NULL, and SCIP_LPBdChgs::usedcols.

Referenced by SCIPrunBoundHeuristic().

lpbdchgsFree()

static void lpbdchgsFree ( SCIP_LPBDCHGS **  lpbdchgs, SCIP_SET *  set  )

static

free conflict LP bound change data structure

Parameters

lpbdchgs	pointer to store the conflict LP bound change data structure
set	global SCIP settings

Definition at line 5104 of file conflict_graphanalysis.c.

References SCIPsetFreeBuffer, and SCIPsetFreeBufferArray.

Referenced by SCIPrunBoundHeuristic().

undoBdchgsDualsol()

static SCIP_RETCODE undoBdchgsDualsol ( SCIP_SET *  set, SCIP_PROB *  prob, SCIP_LP *  lp, int  currentdepth, SCIP_Real *  curvarlbs, SCIP_Real *  curvarubs, int *  lbchginfoposs, int *  ubchginfoposs, SCIP_LPBDCHGS *  oldlpbdchgs, SCIP_LPBDCHGS *  relaxedlpbdchgs, SCIP_Bool *  valid, SCIP_Bool *  resolve, SCIP_Real *  dualcoefs, SCIP_Real  duallhs, SCIP_Real *  dualactivity  )

static

analyzes an LP exceeding the objective limit and undoes additional bound changes while staying beyond the objective limit

Parameters

set	global SCIP settings
prob	problem data
lp	LP data
currentdepth	current depth in the tree
curvarlbs	current lower bounds of active problem variables
curvarubs	current upper bounds of active problem variables
lbchginfoposs	positions of currently active lower bound change information in variables' arrays
ubchginfoposs	positions of currently active upper bound change information in variables' arrays
oldlpbdchgs	old LP bound changes used for reset the LP bound change, or NULL
relaxedlpbdchgs	relaxed LP bound changes used for reset the LP bound change, or NULL
valid	pointer to store whether the unfixings are valid
resolve	pointer to store whether the changed LP should be resolved again
dualcoefs	coefficients in the proof constraint
duallhs	lhs of the proof constraint
dualactivity	maximal activity of the proof constraint

Definition at line 5122 of file conflict_graphanalysis.c.

References SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpGetLPI(), SCIPsetDebugMsg, SCIPsetIsFeasGT(), SCIPundoBdchgsProof(), SCIP_Lp::solved, and TRUE.

Referenced by SCIPrunBoundHeuristic().

SCIPrunBoundHeuristic()

SCIP_RETCODE SCIPrunBoundHeuristic	(	SCIP_CONFLICT *	conflict,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	origprob,
		SCIP_PROB *	transprob,
		SCIP_TREE *	tree,
		SCIP_REOPT *	reopt,
		SCIP_LP *	lp,
		SCIP_LPI *	lpi,
		SCIP_EVENTFILTER *	eventfilter,
		BMS_BLKMEM *	blkmem,
		SCIP_Real *	proofcoefs,
		SCIP_Real *	prooflhs,
		SCIP_Real *	proofactivity,
		SCIP_Real *	curvarlbs,
		SCIP_Real *	curvarubs,
		int *	lbchginfoposs,
		int *	ubchginfoposs,
		int *	iterations,
		SCIP_Bool	marklpunsolved,
		SCIP_Bool *	dualproofsuccess,
		SCIP_Bool *	valid
	)

try to find a subset of changed bounds leading to an infeasible LP

1. call undoBdchgsDualfarkas() or undoBdchgsDualsol() -> update lb/ubchginfoposs arrays -> store additional changes in bdchg and curvarlbs/ubs arrays -> apply additional changes to the LPI
2. (optional) if additional bound changes were undone: -> resolve LP -> goto 1.
3. redo all bound changes in the LPI to restore the LPI to its original state
4. analyze conflict -> put remaining changed bounds (see lb/ubchginfoposs arrays) into starting conflict set

Parameters

conflict	conflict data
set	global SCIP settings
stat	problem statistics
origprob	original problem
transprob	transformed problem
tree	branch and bound tree
reopt	reoptimization data
lp	LP data
lpi	LPI data
eventfilter	global event filter
blkmem	block memory
proofcoefs	coefficients in the proof constraint
prooflhs	lhs of the proof constraint
proofactivity	maximal activity of the proof constraint
curvarlbs	current lower bounds of active problem variables
curvarubs	current upper bounds of active problem variables
lbchginfoposs	positions of currently active lower bound change information in variables' arrays
ubchginfoposs	positions of currently active upper bound change information in variables' arrays
iterations	pointer to store the total number of LP iterations used
marklpunsolved	whether LP should be marked unsolved after analysis (needed for strong branching)
dualproofsuccess	pointer to store success result of dual proof analysis
valid	pointer to store whether the result is still a valid proof

Definition at line 5188 of file conflict_graphanalysis.c.

References addSideRemoval(), SCIP_LPBdChgs::bdchginds, SCIP_LPBdChgs::bdchglbs, SCIP_LPBdChgs::bdchgubs, BMSclearMemoryArray, SCIP_Stat::conflictlptime, SCIP_Conflict::conflictset, SCIP_ConflictSet::conflicttype, SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, lpbdchgsCreate(), lpbdchgsFree(), lpbdchgsReset(), SCIP_Lp::lpiitlim, SCIP_Lp::lpiobjlim, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, SCIP_LPBdChgs::nbdchgs, SCIP_Stat::nconflictlpiterations, SCIP_Stat::nconflictlps, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, r, SCIP_Bool, SCIP_CALL, SCIP_CONFTYPE_INFEASLP, SCIP_INVALID, SCIP_LONGINT_FORMAT, SCIP_LPERROR, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_OBJLIM, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIPaggrRowCreate(), SCIPaggrRowFree(), SCIPaggrRowGetInds(), SCIPaggrRowGetNNz(), SCIPaggrRowGetProbvarValue(), SCIPaggrRowGetRhs(), SCIPclockStart(), SCIPclockStop(), SCIPconflictAnalyzeDualProof(), SCIPgetDualProof(), SCIPgetFarkasProof(), SCIPlpDivingObjChanged(), SCIPlpGetNCols(), SCIPlpGetNRows(), SCIPlpGetRows(), SCIPlpiChgBounds(), SCIPlpiChgSides(), SCIPlpiGetIterations(), SCIPlpiGetObjval(), SCIPlpiInfinity(), SCIPlpiIsDualFeasible(), SCIPlpiIsObjlimExc(), SCIPlpiIsPrimalInfeasible(), SCIPlpiSetIntpar(), SCIPlpiSetRealpar(), SCIPlpiSolveDual(), SCIPprobAllColsInLP(), SCIPprobGetNVars(), SCIPprobGetVars(), SCIProwGetLhs(), SCIProwGetLPPos(), SCIProwGetName(), SCIProwGetRhs(), SCIProwIsLocal(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPtreeGetCurrentDepth(), SCIPtreeGetEffectiveRootDepth(), SCIPvarGetProbindex(), SCIP_Lp::solved, undoBdchgsDualfarkas(), undoBdchgsDualsol(), and SCIP_ConflictSet::usescutoffbound.

Referenced by conflictAnalyzeLP().

SCIPconflictAnalyze()

SCIP_RETCODE SCIPconflictAnalyze	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	prob,
		SCIP_TREE *	tree,
		int	validdepth,
		SCIP_Bool *	success
	)

analyzes conflicting bound changes that were added with calls to SCIPconflictAddBound(), and on success, calls the conflict handlers to create a conflict constraint out of the resulting conflict set; updates statistics for propagation conflict analysis

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
prob	problem data
tree	branch and bound tree
validdepth	minimal depth level at which the initial conflict set is valid
success	pointer to store whether a conflict constraint was created, or NULL

Definition at line 5571 of file conflict_graphanalysis.c.

References SCIP_Conflict::bdchgonlyconfqueue, SCIP_Conflict::bdchgqueue, conflictAnalyze(), conflictCalcMaxsize(), SCIP_Conflict::conflictset, FALSE, SCIP_Conflict::forcedbdchgqueue, SCIP_ConflictSet::nbdchginfos, SCIP_Conflict::npropcalls, SCIP_Conflict::npropconfconss, SCIP_Conflict::npropconfliterals, SCIP_Conflict::npropreconvconss, SCIP_Conflict::npropreconvliterals, SCIP_Conflict::npropsuccess, NULL, SCIP_Conflict::propanalyzetime, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPconflictGraphApplicable(), SCIPpqueueNElems(), SCIPsetDebugMsg, SCIPtreeGetCurrentDepth(), and TRUE.

Referenced by SCIPanalyzeConflict(), and SCIPanalyzeConflictCons().