conflict.c File Reference

Detailed Description

methods and datastructures for conflict analysis

Author

Tobias Achterberg

Timo Berthold

Stefan Heinz

Marc Pfetsch

Michael Winkler

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 infered 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.c.

#include <assert.h>
#include <string.h>
#include "scip/def.h"
#include "scip/set.h"
#include "scip/stat.h"
#include "scip/clock.h"
#include "scip/vbc.h"
#include "scip/history.h"
#include "scip/paramset.h"
#include "scip/lp.h"
#include "scip/var.h"
#include "scip/prob.h"
#include "scip/tree.h"
#include "scip/scip.h"
#include "scip/conflict.h"
#include "scip/cons.h"
#include "scip/prop.h"
#include "scip/presolve.h"
#include "scip/debug.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "lpi/lpi.h"
#include "scip/struct_conflict.h"

Go to the source code of this file.

Macros
#define	CONFLICTSETSCORE(conflictset)
#define	NUMSTOP   9007199254740992.0

Functions
	SCIP_DECL_SORTPTRCOMP (SCIPconflicthdlrComp)
	SCIP_DECL_SORTPTRCOMP (SCIPconflicthdlrCompName)
static	SCIP_DECL_PARAMCHGD (paramChgdConflicthdlrPriority)
SCIP_RETCODE	SCIPconflicthdlrCopyInclude (SCIP_CONFLICTHDLR *conflicthdlr, SCIP_SET *set)
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_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)
static SCIP_RETCODE	lpbdchgsCreate (SCIP_LPBDCHGS **lpbdchgs, SCIP_SET *set, int ncols)
static void	lpbdchgsReset (SCIP_LPBDCHGS *lpbdchgs)
static void	lpbdchgsFree (SCIP_LPBDCHGS **lpbdchgs, SCIP_SET *set)
static SCIP_RETCODE	conflictEnsureTmpbdchginfosMem (SCIP_CONFLICT *conflict, SCIP_SET *set, int num)
static 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 void	conflictsetClear (SCIP_CONFLICTSET *conflictset)
static SCIP_RETCODE	conflictsetCreate (SCIP_CONFLICTSET **conflictset, BMS_BLKMEM *blkmem)
static SCIP_RETCODE	conflictsetCopy (SCIP_CONFLICTSET **targetconflictset, BMS_BLKMEM *blkmem, SCIP_CONFLICTSET *sourceconflictset, int nadditionalelems)
static void	conflictsetFree (SCIP_CONFLICTSET **conflictset, BMS_BLKMEM *blkmem)
static SCIP_RETCODE	conflictsetEnsureBdchginfosMem (SCIP_CONFLICTSET *conflictset, BMS_BLKMEM *blkmem, SCIP_SET *set, int num)
static SCIP_Real	conflictsetCalcScore (SCIP_CONFLICTSET *conflictset)
static SCIP_Bool	bdchginfoIsInvalid (SCIP_CONFLICT *conflict, SCIP_BDCHGINFO *bdchginfo)
static SCIP_RETCODE	conflictsetAddBound (SCIP_CONFLICTSET *conflictset, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_BDCHGINFO *bdchginfo, SCIP_Real relaxedbd)
static SCIP_RETCODE	conflictsetAddBounds (SCIP_CONFLICT *conflict, SCIP_CONFLICTSET *conflictset, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_BDCHGINFO **bdchginfos, int nbdchginfos)
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_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 int	conflictCalcMaxsize (SCIP_SET *set, SCIP_PROB *prob)
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_Bool	checkRedundancy (SCIP_SET *set, SCIP_CONFLICTSET *conflictset)
static SCIP_RETCODE	detectImpliedBounds (SCIP_SET *set, SCIP_PROB *prob, SCIP_CONFLICTSET *conflictset, int *nbdchgs, int *nredvars, SCIP_Bool *redundant)
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_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_CONFLICTSET *conflictset, int insertdepth, SCIP_Bool *success)
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_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue)
int	SCIPconflictGetNConflicts (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNAppliedConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNAppliedLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNGlobalChgBds (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNAppliedGlobalConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNAppliedGlobalLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNLocalChgBds (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNAppliedLocalConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNAppliedLocalLiterals (SCIP_CONFLICT *conflict)
static SCIP_Bool	bdchginfoIsResolvable (SCIP_BDCHGINFO *bdchginfo)
static	SCIP_DECL_SORTPTRCOMP (conflictBdchginfoComp)
SCIP_Bool	SCIPconflictApplicable (SCIP_SET *set)
SCIP_RETCODE	SCIPconflictCreate (SCIP_CONFLICT **conflict, BMS_BLKMEM *blkmem, SCIP_SET *set)
SCIP_RETCODE	SCIPconflictFree (SCIP_CONFLICT **conflict, BMS_BLKMEM *blkmem)
static void	conflictClear (SCIP_CONFLICT *conflict)
SCIP_RETCODE	SCIPconflictInit (SCIP_CONFLICT *conflict, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *prob)
static SCIP_Bool	conflictMarkBoundCheckPresence (SCIP_CONFLICT *conflict, SCIP_BDCHGINFO *bdchginfo, SCIP_Real relaxedbd)
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)
static SCIP_RETCODE	convertToActiveVar (SCIP_VAR **var, SCIP_SET *set, SCIP_BOUNDTYPE *boundtype, SCIP_Real *bound)
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	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)
SCIP_Real	SCIPconflictGetVarLb (SCIP_CONFLICT *conflict, SCIP_VAR *var)
SCIP_Real	SCIPconflictGetVarUb (SCIP_CONFLICT *conflict, SCIP_VAR *var)
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 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 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)
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)
SCIP_Real	SCIPconflictGetGlobalApplTime (SCIP_CONFLICT *conflict)
SCIP_Real	SCIPconflictGetPropTime (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPropCalls (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPropSuccess (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPropConflictConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPropConflictLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPropReconvergenceConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPropReconvergenceLiterals (SCIP_CONFLICT *conflict)
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 SCIP_RETCODE	addBdchg (SCIP_SET *set, SCIP_VAR *var, SCIP_Real newlb, SCIP_Real newub, SCIP_LPBDCHGS *oldlpbdchgs, SCIP_LPBDCHGS *relaxedlpbdchgs)
static SCIP_RETCODE	ensureCandsSize (SCIP_SET *set, SCIP_VAR ***cands, SCIP_Real **candscores, SCIP_Real **newbounds, SCIP_Real **proofactdeltas, int *candssize, int num)
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 void	skipRedundantBdchginfos (SCIP_VAR *var, int *lbchginfopos, int *ubchginfopos)
static SCIP_RETCODE	undoBdchgsProof (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)
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)
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)
static SCIP_RETCODE	conflictAnalyzeRemainingBdchgs (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)
static SCIP_RETCODE	conflictAnalyzeLP (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *transprob, SCIP_PROB *origprob, SCIP_TREE *tree, SCIP_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_Bool diving, int *iterations, int *nconss, int *nliterals, int *nreconvconss, int *nreconvliterals, SCIP_Bool marklpunsolved)
static SCIP_RETCODE	conflictAnalyzeInfeasibleLP (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *transprob, SCIP_PROB *origprob, SCIP_TREE *tree, SCIP_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_Bool *success)
static SCIP_RETCODE	conflictAnalyzeBoundexceedingLP (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *transprob, SCIP_PROB *origprob, SCIP_TREE *tree, SCIP_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_Bool *success)
SCIP_RETCODE	SCIPconflictAnalyzeLP (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *transprob, SCIP_PROB *origprob, SCIP_TREE *tree, SCIP_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_Bool *success)
SCIP_Real	SCIPconflictGetInfeasibleLPTime (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNInfeasibleLPCalls (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNInfeasibleLPSuccess (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNInfeasibleLPConflictConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNInfeasibleLPConflictLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNInfeasibleLPReconvergenceConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNInfeasibleLPReconvergenceLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNInfeasibleLPIterations (SCIP_CONFLICT *conflict)
SCIP_Real	SCIPconflictGetBoundexceedingLPTime (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNBoundexceedingLPCalls (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNBoundexceedingLPSuccess (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNBoundexceedingLPConflictConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNBoundexceedingLPConflictLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNBoundexceedingLPReconvergenceConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNBoundexceedingLPReconvergenceLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNBoundexceedingLPIterations (SCIP_CONFLICT *conflict)
SCIP_RETCODE	SCIPconflictAnalyzeStrongbranch (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *transprob, SCIP_PROB *origprob, SCIP_TREE *tree, SCIP_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_COL *col, SCIP_Bool *downconflict, SCIP_Bool *upconflict)
SCIP_Real	SCIPconflictGetStrongbranchTime (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNStrongbranchCalls (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNStrongbranchSuccess (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNStrongbranchConflictConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNStrongbranchConflictLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNStrongbranchReconvergenceConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNStrongbranchReconvergenceLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNStrongbranchIterations (SCIP_CONFLICT *conflict)
SCIP_RETCODE	SCIPconflictAnalyzePseudo (SCIP_CONFLICT *conflict, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *transprob, SCIP_PROB *origprob, SCIP_TREE *tree, SCIP_LP *lp, SCIP_BRANCHCAND *branchcand, SCIP_EVENTQUEUE *eventqueue, SCIP_Bool *success)
SCIP_Real	SCIPconflictGetPseudoTime (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPseudoCalls (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPseudoSuccess (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPseudoConflictConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPseudoConflictLiterals (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPseudoReconvergenceConss (SCIP_CONFLICT *conflict)
SCIP_Longint	SCIPconflictGetNPseudoReconvergenceLiterals (SCIP_CONFLICT *conflict)
void	SCIPconflictEnableOrDisableClocks (SCIP_CONFLICT *conflict, SCIP_Bool enable)

Macro Definition Documentation

#define CONFLICTSETSCORE

(

conflictset

)

Value:

(-(conflictset)->nbdchginfos - 100*(conflictset)->repropdepth \
      - 1000*(conflictset)->validdepth)

Definition at line 143 of file conflict.c.

Referenced by conflictsetCalcScore().

#define NUMSTOP   9007199254740992.0

Definition at line 4950 of file conflict.c.

Referenced by undoBdchgsDualfarkas().

Function Documentation

SCIP_DECL_SORTPTRCOMP

(

SCIPconflicthdlrComp

)

compares two conflict handlers w. r. to their priority

Definition at line 333 of file conflict.c.

SCIP_DECL_SORTPTRCOMP

(

SCIPconflicthdlrCompName

)

comparison method for sorting conflict handler w.r.t. to their name

Definition at line 339 of file conflict.c.

References SCIPconflicthdlrGetName().

static SCIP_DECL_PARAMCHGD ( paramChgdConflicthdlrPriority  )

static

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

Definition at line 346 of file conflict.c.

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

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 360 of file conflict.c.

References NULL, SCIP_Set::scip, SCIP_CALL, SCIP_OKAY, SCIPconflicthdlrGetName(), and SCIPdebugMessage.

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 379 of file conflict.c.

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

Referenced by SCIPincludeConflicthdlr(), and SCIPincludeConflicthdlrBasic().

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 432 of file conflict.c.

References BMSfreeMemory, BMSfreeMemoryArray, NULL, SCIP_Set::scip, SCIP_CALL, SCIP_OKAY, and SCIPclockFree().

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 459 of file conflict.c.

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

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 496 of file conflict.c.

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

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 527 of file conflict.c.

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

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 551 of file conflict.c.

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

SCIP_RETCODE SCIPconflicthdlrExec	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_SET *	set,
		SCIP_NODE *	node,
		SCIP_NODE *	validnode,
		SCIP_BDCHGINFO **	bdchginfos,
		SCIP_Real *	relaxedbds,
		int	nbdchginfos,
		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
resolved	was the conflict set already used to create a constraint?
result	pointer to store the result of the callback method

Definition at line 575 of file conflict.c.

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

Referenced by conflictAddConflictCons().

SCIP_CONFLICTHDLRDATA* SCIPconflicthdlrGetData

(

SCIP_CONFLICTHDLR *

conflicthdlr

)

gets user data of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 619 of file conflict.c.

References SCIP_Conflicthdlr::conflicthdlrdata, and NULL.

Referenced by SCIP_DECL_CONFLICTEXEC(), and SCIP_DECL_CONFLICTFREE().

void SCIPconflicthdlrSetData	(	SCIP_CONFLICTHDLR *	conflicthdlr,
		SCIP_CONFLICTHDLRDATA *	conflicthdlrdata
	)

sets user data of conflict handler; user has to free old data in advance!

Parameters

conflicthdlr	conflict handler
conflicthdlrdata	new conflict handler user data

Definition at line 629 of file conflict.c.

References SCIP_Conflicthdlr::conflicthdlrdata, and NULL.

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

set copy method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 640 of file conflict.c.

References NULL.

Referenced by SCIPsetConflicthdlrCopy().

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

set destructor of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 651 of file conflict.c.

References NULL.

Referenced by SCIPsetConflicthdlrFree().

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

set initialization method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 662 of file conflict.c.

References NULL.

Referenced by SCIPsetConflicthdlrInit().

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

set deinitialization method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 673 of file conflict.c.

References NULL.

Referenced by SCIPsetConflicthdlrExit().

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

set solving process initialization method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 684 of file conflict.c.

References NULL.

Referenced by SCIPsetConflicthdlrInitsol().

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

set solving process deinitialization method of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 695 of file conflict.c.

References NULL.

Referenced by SCIPsetConflicthdlrExitsol().

const char* SCIPconflicthdlrGetName

(

SCIP_CONFLICTHDLR *

conflicthdlr

)

gets name of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 706 of file conflict.c.

References SCIP_Conflicthdlr::name, and NULL.

Referenced by conflictAddConflictCons(), SCIP_DECL_CONFLICTEXEC(), SCIP_DECL_CONFLICTFREE(), SCIP_DECL_DIALOGEXEC(), SCIP_DECL_SORTPTRCOMP(), SCIPconflicthdlrCopyInclude(), SCIPincludeDialogDefaultFix(), and SCIPincludeDialogDefaultSet().

const char* SCIPconflicthdlrGetDesc

(

SCIP_CONFLICTHDLR *

conflicthdlr

)

gets description of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 716 of file conflict.c.

References SCIP_Conflicthdlr::desc, and NULL.

Referenced by SCIP_DECL_DIALOGEXEC(), SCIPincludeDialogDefaultFix(), and SCIPincludeDialogDefaultSet().

int SCIPconflicthdlrGetPriority

(

SCIP_CONFLICTHDLR *

conflicthdlr

)

gets priority of conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 726 of file conflict.c.

References NULL, and SCIP_Conflicthdlr::priority.

Referenced by conflictAddConflictCons(), and SCIP_DECL_DIALOGEXEC().

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 736 of file conflict.c.

References SCIP_Set::conflicthdlrssorted, FALSE, NULL, and SCIP_Conflicthdlr::priority.

Referenced by SCIPsetConflicthdlrPriority().

SCIP_Bool SCIPconflicthdlrIsInitialized

(

SCIP_CONFLICTHDLR *

conflicthdlr

)

is conflict handler initialized?

Parameters

conflicthdlr

conflict handler

Definition at line 750 of file conflict.c.

References SCIP_Conflicthdlr::initialized, and NULL.

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 760 of file conflict.c.

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

SCIP_Real SCIPconflicthdlrGetSetupTime

(

SCIP_CONFLICTHDLR *

conflicthdlr

)

gets time in seconds used in this conflict handler for setting up for next stages

Parameters

conflicthdlr

conflict handler

Definition at line 772 of file conflict.c.

References NULL, SCIPclockGetTime(), and SCIP_Conflicthdlr::setuptime.

SCIP_Real SCIPconflicthdlrGetTime

(

SCIP_CONFLICTHDLR *

conflicthdlr

)

gets time in seconds used in this conflict handler

Parameters

conflicthdlr

conflict handler

Definition at line 782 of file conflict.c.

References SCIP_Conflicthdlr::conflicttime, NULL, and SCIPclockGetTime().

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 798 of file conflict.c.

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

Referenced by conflictAnalyzeLP().

static void lpbdchgsReset ( SCIP_LPBDCHGS *  lpbdchgs )

static

reset conflict LP bound change data structure

Parameters

lpbdchgs

conflict LP bound change data structure

Definition at line 820 of file conflict.c.

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

Referenced by conflictAnalyzeLP().

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 832 of file conflict.c.

References SCIPsetFreeBuffer, and SCIPsetFreeBufferArray.

Referenced by conflictAnalyzeLP().

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 852 of file conflict.c.

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

Referenced by conflictCreateTmpBdchginfo().

static 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

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 876 of file conflict.c.

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

Referenced by conflictAnalyzeRemainingBdchgs(), and conflictCreateReconvergenceConss().

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 900 of file conflict.c.

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

Referenced by SCIPconflictFlushConss().

static void conflictsetClear ( SCIP_CONFLICTSET *  conflictset )

static

clears the given conflict set

Parameters

conflictset

conflict set

Definition at line 916 of file conflict.c.

References SCIP_ConflictSet::conflictdepth, SCIP_ConflictSet::insertdepth, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::repropagate, SCIP_ConflictSet::repropdepth, TRUE, and SCIP_ConflictSet::validdepth.

Referenced by conflictClear(), and conflictsetCreate().

static SCIP_RETCODE conflictsetCreate ( SCIP_CONFLICTSET **  conflictset, BMS_BLKMEM *  blkmem  )

static

creates an empty conflict set

Parameters

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

Definition at line 932 of file conflict.c.

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

Referenced by SCIPconflictCreate().

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 952 of file conflict.c.

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

Referenced by conflictAddConflictset().

static void conflictsetFree ( SCIP_CONFLICTSET **  conflictset, BMS_BLKMEM *  blkmem  )

static

frees a conflict set

Parameters

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

Definition at line 986 of file conflict.c.

References BMSfreeBlockMemory, BMSfreeBlockMemoryArrayNull, and NULL.

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

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

static

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 1002 of file conflict.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().

static SCIP_Real conflictsetCalcScore ( SCIP_CONFLICTSET *  conflictset )

static

updates the score of the conflict set

Parameters

conflictset

conflict set

Definition at line 1029 of file conflict.c.

References CONFLICTSETSCORE, NULL, and SCIP_Real.

Referenced by conflictInsertConflictset().

static SCIP_Bool bdchginfoIsInvalid ( SCIP_CONFLICT *  conflict, SCIP_BDCHGINFO *  bdchginfo  )

static

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 1072 of file conflict.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().

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 1115 of file conflict.c.

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

Referenced by conflictAddConflictBound(), and 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 1185 of file conflict.c.

References bdchginfoIsInvalid(), SCIP_ConflictSet::bdchginfos, conflictsetAddBound(), conflictsetEnsureBdchginfosMem(), FALSE, 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(), SCIPdebugMessage, SCIPsortIntPtrReal(), SCIPvarGetIndex(), SCIPvarGetName(), SCIP_ConflictSet::sortvals, and TRUE.

Referenced by conflictAddConflictset().

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 1351 of file conflict.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().

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 1395 of file conflict.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().

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 1442 of file conflict.c.

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

Referenced by conflictInsertConflictset().

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 1504 of file conflict.c.

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

Referenced by 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 1529 of file conflict.c.

References SCIP_Set::conf_allowlocal, SCIP_Set::conf_repropagate, conflictEnsureConflictsetsMem(), conflictsetCalcConflictDepth(), conflictsetCalcScore(), conflictsetFree(), conflictsetIsRedundant(), SCIP_Conflict::conflictsets, SCIP_Conflict::conflictsetscores, MIN, SCIP_Conflict::nconflictsets, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebug, and SCIPdebugMessage.

Referenced by conflictAddConflictset().

static int conflictCalcMaxsize ( SCIP_SET *  set, SCIP_PROB *  prob  )

static

calculates the maximal size of conflict sets to be used

Parameters

set	global SCIP settings
prob	problem data

Definition at line 1624 of file conflict.c.

References SCIP_Set::conf_maxvarsfac, SCIP_Set::conf_minmaxvars, MAX, SCIP_Prob::ncontvars, NULL, and SCIP_Prob::nvars.

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

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 1642 of file conflict.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(), conflictAnalyzeRemainingBdchgs(), and 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 1673 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, SCIP_Set::conf_conflictweight, 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().

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 1727 of file conflict.c.

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

Referenced by detectImpliedBounds().

static SCIP_RETCODE detectImpliedBounds ( SCIP_SET *  set, SCIP_PROB *  prob, 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
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 gloabl reduction on a conflict set variable, which makes this conflict redundant

Definition at line 1792 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, checkRedundancy(), SCIP_Set::conf_fullshortenconflict, SCIP_Set::conf_maxvarsdetectimpliedbounds, FALSE, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_Set::scip, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPboundtypeOpposite(), SCIPdebugMessage, SCIPdebugPrintf, SCIPprobGetName(), SCIPprobGetNVars(), SCIPprobIsTransformed(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPsetIsEQ(), SCIPsetIsFeasEQ(), SCIPsetIsFeasGT(), SCIPsetIsFeasLT(), SCIPsetIsGE(), SCIPsetIsIntegral(), SCIPsetIsLE(), SCIPsetIsZero(), SCIPshrinkDisjunctiveVarSet(), SCIPsortLongPtrRealRealBool(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetNBinImpls(), SCIPvarGetNCliques(), SCIPvarGetNVlbs(), SCIPvarGetNVubs(), SCIPvarGetProbindex(), SCIPvarGetUbGlobal(), SCIPvarIsBinary(), SCIPvarIsIntegral(), SCIP_ConflictSet::sortvals, and TRUE.

Referenced by 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_LP *  lp, SCIP_BRANCHCAND *  branchcand, SCIP_EVENTQUEUE *  eventqueue, 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
lp	current LP data
branchcand	branching candidate storage
eventqueue	event queue
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 2064 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, SCIP_BdChgInfo::boundtype, SCIP_ConflictSet::conflictdepth, SCIP_Set::conflicthdlrs, detectImpliedBounds(), SCIP_Conflict::dIBclock, SCIP_Lp::diving, FALSE, SCIP_ConflictSet::nbdchginfos, SCIP_Set::nconflicthdlrs, NULL, SCIP_Tree::path, SCIP_ConflictSet::relaxedbds, SCIP_Tree::root, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_CONSADDED, SCIP_OKAY, SCIP_Real, SCIPboundtypeOpposite(), SCIPclockStart(), SCIPclockStop(), SCIPconflicthdlrExec(), SCIPconflicthdlrGetName(), SCIPconflicthdlrGetPriority(), SCIPdebug, SCIPdebugCheckConflict, SCIPdebugMessage, SCIPnodeAddBoundchg(), SCIPsetIsIntegral(), SCIPsetSortConflicthdlrs(), SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), SCIPvarGetName(), SCIPvarIsIntegral(), SCIP_Lp::strongbranching, TRUE, updateStatistics(), SCIP_ConflictSet::validdepth, and SCIP_BdChgInfo::var.

Referenced by 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_LP *	lp,
		SCIP_BRANCHCAND *	branchcand,
		SCIP_EVENTQUEUE *	eventqueue
	)

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
lp	current LP data
branchcand	branching candidate storage
eventqueue	event queue

Definition at line 2200 of file conflict.c.

References SCIP_Set::conf_keepreprop, SCIP_Set::conf_maxconss, SCIP_Set::conf_repropagate, conflictAddConflictCons(), conflictCalcMaxsize(), SCIP_ConflictSet::conflictdepth, conflictFreeTmpBdchginfos(), conflictsetFree(), 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, SCIPdebug, SCIPdebugMessage, SCIPnodeCutoff(), SCIPnodePropagateAgain(), SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), SCIPvbcFoundConflict(), SCIP_ConflictSet::validdepth, and SCIP_Stat::vbc.

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

int SCIPconflictGetNConflicts

(

SCIP_CONFLICT *

conflict

)

returns the current number of conflict sets in the conflict set storage

Parameters

conflict

conflict analysis data

Definition at line 2376 of file conflict.c.

References SCIP_Conflict::nconflictsets, and NULL.

Referenced by propAndSolve(), SCIPgetNConflictConssFoundNode(), SCIPgetVarStrongbranchWithPropagation(), and solveNode().

SCIP_Longint SCIPconflictGetNAppliedConss

(

SCIP_CONFLICT *

conflict

)

returns the total number of conflict constraints that were added to the problem

Parameters

conflict

conflict analysis data

Definition at line 2386 of file conflict.c.

References SCIP_Conflict::nappliedglbconss, SCIP_Conflict::nappliedlocconss, and NULL.

Referenced by SCIPgetNConflictConssApplied().

SCIP_Longint SCIPconflictGetNAppliedLiterals

(

SCIP_CONFLICT *

conflict

)

returns the total number of literals in conflict constraints that were added to the problem

Parameters

conflict

conflict analysis data

Definition at line 2396 of file conflict.c.

References SCIP_Conflict::nappliedglbliterals, SCIP_Conflict::nappliedlocliterals, and NULL.

SCIP_Longint SCIPconflictGetNGlobalChgBds

(

SCIP_CONFLICT *

conflict

)

returns the total number of global bound changes applied by the conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 2406 of file conflict.c.

References SCIP_Conflict::nglbchgbds, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNAppliedGlobalConss

(

SCIP_CONFLICT *

conflict

)

returns the total number of conflict constraints that were added globally to the problem

Parameters

conflict

conflict analysis data

Definition at line 2416 of file conflict.c.

References SCIP_Conflict::nappliedglbconss, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNAppliedGlobalLiterals

(

SCIP_CONFLICT *

conflict

)

returns the total number of literals in conflict constraints that were added globally to the problem

Parameters

conflict

conflict analysis data

Definition at line 2426 of file conflict.c.

References SCIP_Conflict::nappliedglbliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNLocalChgBds

(

SCIP_CONFLICT *

conflict

)

returns the total number of local bound changes applied by the conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 2436 of file conflict.c.

References SCIP_Conflict::nlocchgbds, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNAppliedLocalConss

(

SCIP_CONFLICT *

conflict

)

returns the total number of conflict constraints that were added locally to the problem

Parameters

conflict

conflict analysis data

Definition at line 2446 of file conflict.c.

References SCIP_Conflict::nappliedlocconss, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNAppliedLocalLiterals

(

SCIP_CONFLICT *

conflict

)

returns the total number of literals in conflict constraints that were added locally to the problem

Parameters

conflict

conflict analysis data

Definition at line 2456 of file conflict.c.

References SCIP_Conflict::nappliedlocliterals, and NULL.

Referenced by printConflictStatistics().

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 2474 of file conflict.c.

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

Referenced by addCand(), and conflictCreateReconvergenceConss().

static SCIP_DECL_SORTPTRCOMP ( conflictBdchginfoComp  )

static

compares two conflict set entries, such that bound changes infered later are ordered prior to ones that were infered earlier

Definition at line 2490 of file conflict.c.

References NULL, SCIPbdchgidxIsEarlierNonNull(), SCIPbdchginfoGetIdx(), and SCIPbdchginfoIsRedundant().

SCIP_Bool SCIPconflictApplicable

(

SCIP_SET *

set

)

return TRUE if conflict analysis is applicable; In case the function return FALSE there is no need to initialize the conflict analysis since it will not be applied

Parameters

set	global SCIP settings

Definition at line 2511 of file conflict.c.

References SCIP_Set::conf_enable, SCIP_Set::conf_useprop, FALSE, SCIP_Set::nconflicthdlrs, and TRUE.

Referenced by SCIPconflictAnalyze(), and SCIPisConflictAnalysisApplicable().

SCIP_RETCODE SCIPconflictCreate	(	SCIP_CONFLICT **	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set
	)

creates conflict analysis data for propagation conflicts

Parameters

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

Definition at line 2527 of file conflict.c.

References BMSallocMemory, conflictsetCreate(), SCIP_Set::mem_arraygrowfac, SCIP_Set::mem_arraygrowinit, NULL, SCIP_ALLOC, SCIP_CALL, SCIP_CLOCKTYPE_DEFAULT, SCIP_OKAY, SCIPclockCreate(), SCIPconflictEnableOrDisableClocks(), SCIPpqueueCreate(), and SCIP_Set::time_statistictiming.

Referenced by SCIPtransformProb().

SCIP_RETCODE SCIPconflictFree	(	SCIP_CONFLICT **	conflict,
		BMS_BLKMEM *	blkmem
	)

frees conflict analysis data for propagation conflicts

Parameters

conflict	pointer to conflict analysis data
blkmem	block memory of transformed problem

Definition at line 2604 of file conflict.c.

References BMSfreeMemory, BMSfreeMemoryArrayNull, conflictsetFree(), NULL, SCIP_OKAY, SCIPclockFree(), and SCIPpqueueFree().

Referenced by freeTransform().

static void conflictClear ( SCIP_CONFLICT *  conflict )

static

clears the conflict queue and the current conflict set

Parameters

conflict

conflict analysis data

Definition at line 2637 of file conflict.c.

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

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

SCIP_RETCODE SCIPconflictInit	(	SCIP_CONFLICT *	conflict,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	prob
	)

initializes the propagation conflict analysis by clearing the conflict candidate queue

Parameters

conflict	conflict analysis data
set	global SCIP settings
stat	problem statistics
prob	problem data

Definition at line 2649 of file conflict.c.

References SCIP_Set::conf_scorefac, conflictClear(), SCIP_Conflict::count, SCIP_Stat::glbhistory, SCIP_Stat::glbhistorycrun, SCIP_Stat::lastconflictnode, SCIP_Stat::nnodes, NULL, SCIP_Prob::nvars, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIPhistoryScaleVSIDS(), SCIPvarScaleVSIDS(), SCIP_Prob::vars, and SCIP_Stat::vsidsweight.

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

static SCIP_Bool conflictMarkBoundCheckPresence ( SCIP_CONFLICT *  conflict, 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
bdchginfo	bound change to add to the conflict set
relaxedbd	relaxed bound

Definition at line 2708 of file conflict.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(), SCIPdebugMessage, SCIPerrorMessage, SCIPvarGetName(), and TRUE.

Referenced by conflictAddConflictBound(), and conflictQueueBound().

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 2796 of file conflict.c.

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

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

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 2839 of file conflict.c.

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

Referenced by conflictQueueBound().

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

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

Definition at line 2859 of file conflict.c.

References SCIP_Conflict::bdchgqueue, SCIP_Set::conf_preferbinary, conflictMarkBoundCheckPresence(), SCIP_Conflict::forcedbdchgqueue, isBoundchgUseless(), NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPpqueueInsert(), SCIPsetIsGE(), SCIPsetIsLE(), and SCIPvarIsBinary().

Referenced by conflictAddBound(), and conflictCreateReconvergenceConss().

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 2905 of file conflict.c.

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

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

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 2940 of file conflict.c.

References SCIP_Set::conf_conflictgraphweight, conflictQueueBound(), incVSIDS(), NULL, 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(), SCIPdebugMessage, SCIPpropGetName(), SCIPsetIsGE(), SCIPsetIsGT(), SCIPsetIsLE(), SCIPsetIsLT(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetType(), and SCIPvarIsActive().

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

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 2996 of file conflict.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().

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 3057 of file conflict.c.

References SCIP_BdChgInfo::bdchgidx, SCIP_Set::conf_ignorerelaxedbd, 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(), SCIPdebugMessage, SCIPsetIsGE(), SCIPsetIsGT(), SCIPsetIsLE(), SCIPsetIsLT(), SCIPvarAdjustLb(), SCIPvarAdjustUb(), SCIPvarGetBdchgInfo(), SCIPvarGetBdchgInfoLb(), SCIPvarGetBdchgInfoUb(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), and SCIPvarIsActive().

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

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 3221 of file conflict.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, SCIPdebugMessage, SCIPerrorMessage, SCIPvarGetLbAtIndex(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetUbAtIndex(), SCIPvarIsActive(), and TRUE.

Referenced by SCIPisConflictVarUsed().

SCIP_Real SCIPconflictGetVarLb	(	SCIP_CONFLICT *	conflict,
		SCIP_VAR *	var
	)

returns the conflict lower bound if the variable is present in the current conflict set; otherwise the global lower bound

Parameters

conflict	conflict analysis data
var	problem variable

Definition at line 3281 of file conflict.c.

References SCIP_Var::conflictlb, SCIP_Var::conflictlbcount, SCIP_Var::conflictrelaxedlb, SCIP_Conflict::count, EPSGE, and SCIPvarGetLbGlobal().

Referenced by SCIPgetConflictVarLb().

SCIP_Real SCIPconflictGetVarUb	(	SCIP_CONFLICT *	conflict,
		SCIP_VAR *	var
	)

returns the conflict upper bound if the variable is present in the current conflict set; otherwise the global upper bound

Parameters

conflict	conflict analysis data
var	problem variable

Definition at line 3298 of file conflict.c.

References SCIP_Var::conflictrelaxedub, SCIP_Var::conflictub, SCIP_Var::conflictubcount, SCIP_Conflict::count, EPSLE, and SCIPvarGetUbGlobal().

Referenced by SCIPgetConflictVarUb().

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 3314 of file conflict.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().

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 3358 of file conflict.c.

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

Referenced by conflictAnalyze(), and conflictCreateReconvergenceConss().

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 3412 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, SCIP_Set::conf_allowlocal, SCIP_Set::conf_settlelocal, conflictInsertConflictset(), SCIP_Conflict::conflictset, conflictsetAddBounds(), conflictsetCalcInsertDepth(), conflictsetCopy(), conflictsetFree(), 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, SCIPdebugCheckConflict, SCIPdebugMessage, SCIPpqueueElems(), SCIPpqueueNElems(), SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), TRUE, and SCIP_ConflictSet::validdepth.

Referenced by conflictAnalyze(), and conflictCreateReconvergenceConss().

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 3511 of file conflict.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_NEGATED, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetChgtype(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetIdx(), SCIPbdchginfoGetInferBoundtype(), SCIPbdchginfoGetInferCons(), SCIPbdchginfoGetInferInfo(), SCIPbdchginfoGetInferProp(), SCIPbdchginfoGetInferVar(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetPos(), SCIPbdchginfoGetRelaxedBound(), SCIPbdchginfoGetVar(), SCIPbdchginfoIsRedundant(), SCIPconsGetName(), SCIPconsGetValidDepth(), SCIPconsIsGlobal(), SCIPconsResolvePropagation(), SCIPdebugMessage, SCIPdebugPrintf, SCIPerrorMessage, SCIPpqueueElems(), SCIPpqueueNElems(), SCIPpropGetName(), SCIPpropResolvePropagation(), SCIPvarGetBdAtIndex(), SCIPvarGetName(), SCIPvarGetProbvarSum(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarIsActive(), and TRUE.

Referenced by conflictAnalyze(), and 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 3719 of file conflict.c.

References bdchginfoIsResolvable(), SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, SCIP_Set::conf_allowlocal, conflictAddConflictBound(), conflictAddConflictset(), conflictClear(), conflictCreateTmpBdchginfo(), conflictFirstCand(), conflictQueueBound(), conflictRemoveCand(), conflictResolveBound(), SCIP_Conflict::conflictset, 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, SCIPdebugMessage, SCIPpqueueNElems(), SCIPsetIsIntegral(), SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), SCIPvarGetName(), SCIPvarIsActive(), and SCIPvarIsIntegral().

Referenced by conflictAnalyze().

static 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

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 3947 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, SCIP_DomChgBound::boundchgs, SCIP_Set::conf_allowlocal, SCIP_Set::conf_fuiplevels, SCIP_Set::conf_interconss, SCIP_Set::conf_reconvlevels, conflictAddConflictBound(), conflictAddConflictset(), conflictClear(), conflictCreateReconvergenceConss(), conflictFirstCand(), conflictRemoveCand(), conflictResolveBound(), SCIP_Conflict::conflictset, 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, SCIPdebugMessage, SCIPpqueueNElems(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPtreeGetCurrentDepth(), SCIPtreeGetFocusDepth(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetUbGlobal(), SCIPvarIsActive(), and TRUE.

Referenced by conflictAnalyzeRemainingBdchgs(), and 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 4227 of file conflict.c.

References 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(), SCIPconflictApplicable(), SCIPdebugMessage, SCIPpqueueNElems(), SCIPtreeGetCurrentDepth(), and TRUE.

Referenced by SCIPanalyzeConflict(), and SCIPanalyzeConflictCons().

SCIP_Real SCIPconflictGetGlobalApplTime

(

SCIP_CONFLICT *

conflict

)

gets time in seconds used for preprocessing global conflict constraint before appliance

Parameters

conflict

conflict analysis data

Definition at line 4286 of file conflict.c.

References SCIP_Conflict::dIBclock, NULL, and SCIPclockGetTime().

Referenced by printConflictStatistics().

SCIP_Real SCIPconflictGetPropTime

(

SCIP_CONFLICT *

conflict

)

gets time in seconds used for analyzing propagation conflicts

Parameters

conflict

conflict analysis data

Definition at line 4296 of file conflict.c.

References NULL, SCIP_Conflict::propanalyzetime, and SCIPclockGetTime().

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNPropCalls

(

SCIP_CONFLICT *

conflict

)

gets number of calls to propagation conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 4306 of file conflict.c.

References SCIP_Conflict::npropcalls, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNPropSuccess

(

SCIP_CONFLICT *

conflict

)

gets number of calls to propagation conflict analysis that yield at least one conflict constraint

Parameters

conflict

conflict analysis data

Definition at line 4316 of file conflict.c.

References SCIP_Conflict::npropsuccess, and NULL.

Referenced by printConflictStatistics(), and SCIPsolveCIP().

SCIP_Longint SCIPconflictGetNPropConflictConss

(

SCIP_CONFLICT *

conflict

)

gets number of conflict constraints detected in propagation conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 4326 of file conflict.c.

References SCIP_Conflict::npropconfconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNPropConflictLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in conflict constraints created in propagation conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 4336 of file conflict.c.

References SCIP_Conflict::npropconfliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNPropReconvergenceConss

(

SCIP_CONFLICT *

conflict

)

gets number of reconvergence constraints detected in propagation conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 4346 of file conflict.c.

References SCIP_Conflict::npropreconvconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNPropReconvergenceLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in reconvergence constraints created in propagation conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 4356 of file conflict.c.

References SCIP_Conflict::npropreconvliterals, and NULL.

Referenced by printConflictStatistics().

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 4374 of file conflict.c.

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

Referenced by 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 4413 of file conflict.c.

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

Referenced by conflictAnalyzeLP().

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

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, or NULL
relaxedlpbdchgs	relaxed LP bound changes used for reset the LP bound change, or NULL

Definition at line 4482 of file conflict.c.

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

Referenced by undoBdchgsProof().

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 4554 of file conflict.c.

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

Referenced by 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 4591 of file conflict.c.

References SCIP_BdChgInfo::bdchgidx, bdchginfoIsResolvable(), SCIP_Set::conf_depthscorefac, SCIP_BdChgIdx::depth, ensureCandsSize(), FALSE, SCIP_Var::lbchginfos, MAX, SCIP_BdChgInfo::newbound, SCIP_Var::nlbchginfos, SCIP_Var::nubchginfos, NULL, SCIP_BdChgInfo::oldbound, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPsetIsGT(), SCIPsetIsZero(), SCIPvarGetLbLocal(), SCIPvarGetLbLP(), SCIPvarGetName(), SCIPvarGetUbLocal(), SCIPvarGetUbLP(), SCIPvarIsBinary(), and SCIP_Var::ubchginfos.

Referenced by undoBdchgsProof().

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 4727 of file conflict.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 undoBdchgsProof().

static SCIP_RETCODE undoBdchgsProof ( 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  )

static

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

Definition at line 4759 of file conflict.c.

References addBdchg(), addCand(), FALSE, NULL, SCIP_Prob::nvars, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPsetAllocBufferArray, 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().

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  )

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

Definition at line 4954 of file conflict.c.

References BMSclearMemoryArray, SCIP_Row::cols, SCIP_Row::constant, SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, SCIP_Row::len, SCIP_Row::lhs, SCIP_Row::local, SCIP_Lp::lpirows, SCIP_Lp::nlpirows, NULL, NUMSTOP, SCIP_Prob::nvars, REALABS, SCIP_Row::rhs, SCIP_CALL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPcolGetLPPos(), SCIPcolGetVar(), SCIPdebugMessage, SCIPlpGetLPI(), SCIPlpGetNRows(), SCIPlpGetRows(), SCIPlpiGetDualfarkas(), SCIPlpiGetSides(), SCIPlpiHasDualRay(), SCIProwGetName(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPsetIsFeasGT(), SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPsetIsRelEQ(), SCIPsetIsZero(), SCIPvarGetCol(), SCIPvarGetLbLP(), SCIPvarGetName(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIPvarGetUbLP(), SCIP_Lp::solved, TRUE, undoBdchgsProof(), SCIP_Row::vals, and SCIP_Prob::vars.

Referenced by conflictAnalyzeLP().

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  )

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

Definition at line 5162 of file conflict.c.

References BMSclearMemoryArray, SCIP_Row::cols, SCIP_Lp::cols, SCIP_Row::constant, SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, SCIP_Row::len, SCIP_Row::lhs, SCIP_Row::local, SCIP_Lp::lpicols, SCIP_Lp::lpirows, SCIP_Lp::nlpirows, NULL, SCIP_Prob::nvars, SCIP_Row::rhs, SCIP_CALL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIPcolCalcRedcost(), SCIPcolGetLPPos(), SCIPcolGetVar(), SCIPdebugMessage, SCIPlpGetLPI(), SCIPlpGetNCols(), SCIPlpGetNRows(), SCIPlpGetRows(), SCIPlpiGetObjval(), SCIPlpiGetSol(), SCIProwGetName(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPsetIsDualfeasNegative(), SCIPsetIsDualfeasPositive(), SCIPsetIsFeasGT(), SCIPsetIsGT(), SCIPsetIsInfinity(), SCIPsetIsLT(), SCIPsetIsZero(), SCIPsetSumepsilon(), SCIPvarGetCol(), SCIPvarGetName(), SCIPvarGetObj(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIP_Lp::solved, TRUE, undoBdchgsProof(), SCIP_Row::vals, and SCIP_Prob::vars.

Referenced by conflictAnalyzeLP().

static SCIP_RETCODE conflictAnalyzeRemainingBdchgs ( 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  )

static

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 5408 of file conflict.c.

References SCIP_Set::conf_conflictgraphweight, conflictAddBound(), conflictAddConflictBound(), conflictAnalyze(), conflictCalcMaxsize(), conflictCreateTmpBdchginfo(), FALSE, incVSIDS(), SCIP_Var::lbchginfos, SCIP_Var::nlbchginfos, SCIP_Var::nubchginfos, NULL, SCIP_Prob::nvars, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoIsRedundant(), SCIPconflictInit(), SCIPdebugMessage, SCIPvarGetLbLocal(), SCIPvarGetLbLP(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarGetUbLocal(), SCIPvarGetUbLP(), SCIP_Var::ubchginfos, and SCIP_Prob::vars.

Referenced by conflictAnalyzeLP(), and SCIPconflictAnalyzePseudo().

static SCIP_RETCODE conflictAnalyzeLP ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_PROB *  transprob, SCIP_PROB *  origprob, SCIP_TREE *  tree, SCIP_LP *  lp, SCIP_BRANCHCAND *  branchcand, SCIP_EVENTQUEUE *  eventqueue, SCIP_Bool  diving, int *  iterations, int *  nconss, int *  nliterals, int *  nreconvconss, int *  nreconvliterals, SCIP_Bool  marklpunsolved  )

static

actually performs analysis of infeasible LP

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
transprob	transformed problem
origprob	original problem
tree	branch and bound tree
lp	LP data
branchcand	branching candidate storage
eventqueue	event queue
diving	are we in strong branching or diving mode?
iterations	pointer to store the total number of LP iterations used
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
marklpunsolved	whether LP should be marked unsolved after analysis (needed for strong branching)

Definition at line 5536 of file conflict.c.

References addSideRemoval(), SCIP_LPBdChgs::bdchginds, SCIP_LPBdChgs::bdchglbs, SCIP_LPBdChgs::bdchgubs, SCIP_Set::conf_lpiterations, SCIP_Set::conf_maxlploops, conflictAnalyzeRemainingBdchgs(), SCIP_Stat::conflictlptime, SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::flushed, lpbdchgsCreate(), lpbdchgsFree(), lpbdchgsReset(), SCIP_Lp::lpiitlim, SCIP_Lp::lpiuobjlim, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, SCIP_LPBdChgs::nbdchgs, SCIP_Stat::nconflictlpiterations, SCIP_Stat::nconflictlps, SCIP_Conflict::nconflictsets, SCIP_Var::nlbchginfos, SCIP_Var::nubchginfos, NULL, SCIP_Prob::nvars, SCIP_Lp::primalfeasible, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_LPERROR, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_UOBJLIM, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIPclockStart(), SCIPclockStop(), SCIPconflictFlushConss(), SCIPdebugMessage, SCIPlpDivingObjChanged(), SCIPlpGetLPI(), SCIPlpGetNCols(), SCIPlpGetNRows(), SCIPlpGetRows(), SCIPlpiChgBounds(), SCIPlpiChgSides(), SCIPlpiGetIterations(), SCIPlpiGetObjval(), SCIPlpiGetRealpar(), SCIPlpiInfinity(), SCIPlpiIsDualFeasible(), SCIPlpiIsObjlimExc(), SCIPlpiIsOptimal(), SCIPlpiIsPrimalInfeasible(), SCIPlpiSetIntpar(), SCIPlpiSetRealpar(), SCIPlpiSolveDual(), SCIPprobAllColsInLP(), SCIProwGetLhs(), SCIProwGetLPPos(), SCIProwGetName(), SCIProwGetRhs(), SCIProwIsLocal(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPsetIsEQ(), SCIPsetIsGT(), SCIPsetIsLT(), SCIPtreeGetCurrentDepth(), SCIPvarGetLbLocal(), SCIPvarGetLbLP(), SCIPvarGetUbLocal(), SCIPvarGetUbLP(), SCIP_Lp::solved, TRUE, undoBdchgsDualfarkas(), undoBdchgsDualsol(), and SCIP_Prob::vars.

Referenced by conflictAnalyzeBoundexceedingLP(), conflictAnalyzeInfeasibleLP(), and SCIPconflictAnalyzeStrongbranch().

static SCIP_RETCODE conflictAnalyzeInfeasibleLP ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_PROB *  transprob, SCIP_PROB *  origprob, SCIP_TREE *  tree, SCIP_LP *  lp, SCIP_BRANCHCAND *  branchcand, SCIP_EVENTQUEUE *  eventqueue, SCIP_Bool *  success  )

static

analyzes an infeasible LP to find out the bound changes on variables that were responsible for the infeasibility; on success, calls standard conflict analysis with the responsible variables as starting conflict set, thus creating a conflict constraint out of the resulting conflict set; updates statistics for infeasible LP conflict analysis

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
transprob	transformed problem
origprob	original problem
tree	branch and bound tree
lp	LP data
branchcand	branching candidate storage
eventqueue	event queue
success	pointer to store whether a conflict constraint was created, or NULL

Definition at line 6002 of file conflict.c.

References SCIP_Set::conf_enable, SCIP_Set::conf_useinflp, conflictAnalyzeLP(), FALSE, SCIP_Conflict::inflpanalyzetime, SCIP_Set::nconflicthdlrs, SCIP_Conflict::ninflpcalls, SCIP_Conflict::ninflpconfconss, SCIP_Conflict::ninflpconfliterals, SCIP_Conflict::ninflpiterations, SCIP_Conflict::ninflpreconvconss, SCIP_Conflict::ninflpreconvliterals, SCIP_Conflict::ninflpsuccess, NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPdebugMessage, SCIPlpDiving(), SCIPlpDivingObjChanged(), SCIPlpGetSolstat(), SCIPprobAllColsInLP(), SCIPtreeGetCurrentDepth(), and TRUE.

Referenced by SCIPconflictAnalyzeLP().

static SCIP_RETCODE conflictAnalyzeBoundexceedingLP ( SCIP_CONFLICT *  conflict, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_PROB *  transprob, SCIP_PROB *  origprob, SCIP_TREE *  tree, SCIP_LP *  lp, SCIP_BRANCHCAND *  branchcand, SCIP_EVENTQUEUE *  eventqueue, SCIP_Bool *  success  )

static

analyzes a bound exceeding LP to find out the bound changes on variables that were responsible for exceeding the primal bound; on success, calls standard conflict analysis with the responsible variables as starting conflict set, thus creating a conflict constraint out of the resulting conflict set; updates statistics for bound exceeding LP conflict analysis

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
transprob	transformed problem
origprob	original problem
tree	branch and bound tree
lp	LP data
branchcand	branching candidate storage
eventqueue	event queue
success	pointer to store whether a conflict constraint was created, or NULL

Definition at line 6069 of file conflict.c.

References SCIP_Conflict::boundlpanalyzetime, SCIP_Set::conf_enable, SCIP_Set::conf_useboundlp, conflictAnalyzeLP(), FALSE, SCIP_Conflict::nboundlpcalls, SCIP_Conflict::nboundlpconfconss, SCIP_Conflict::nboundlpconfliterals, SCIP_Conflict::nboundlpiterations, SCIP_Conflict::nboundlpreconvconss, SCIP_Conflict::nboundlpreconvliterals, SCIP_Conflict::nboundlpsuccess, SCIP_Set::nconflicthdlrs, NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPdebugMessage, SCIPlpDiving(), SCIPlpDivingObjChanged(), SCIPlpGetSolstat(), SCIPprobAllColsInLP(), SCIPtreeGetCurrentDepth(), and TRUE.

Referenced by SCIPconflictAnalyzeLP().

SCIP_RETCODE SCIPconflictAnalyzeLP	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	transprob,
		SCIP_PROB *	origprob,
		SCIP_TREE *	tree,
		SCIP_LP *	lp,
		SCIP_BRANCHCAND *	branchcand,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_Bool *	success
	)

analyzes an infeasible or bound exceeding LP to find out the bound changes on variables that were responsible for the infeasibility or for exceeding the primal bound; on success, calls standard conflict analysis with the responsible variables as starting conflict set, thus creating a conflict constraint out of the resulting conflict set; updates statistics for infeasible or bound exceeding LP conflict analysis; may only be called if SCIPprobAllColsInLP()

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
transprob	transformed problem
origprob	original problem
tree	branch and bound tree
lp	LP data
branchcand	branching candidate storage
eventqueue	event queue
success	pointer to store whether a conflict constraint was created, or NULL

Definition at line 6137 of file conflict.c.

References SCIP_RowSolVals::activity, SCIP_Row::activity, SCIP_ColSolVals::basisstatus, SCIP_RowSolVals::basisstatus, SCIP_Col::basisstatus, SCIP_Row::basisstatus, SCIP_Lp::cols, conflictAnalyzeBoundexceedingLP(), conflictAnalyzeInfeasibleLP(), SCIP_Row::dualfarkas, SCIP_LpSolVals::dualfeasible, SCIP_Lp::dualfeasible, SCIP_RowSolVals::dualsol, SCIP_Row::dualsol, FALSE, SCIP_Lp::flushed, SCIP_Set::lp_disablecutoff, SCIP_LpSolVals::lpissolved, SCIP_LpSolVals::lpobjval, SCIP_Lp::lpobjval, SCIP_LpSolVals::lpsolstat, SCIP_Lp::lpsolstat, SCIP_Lp::ncols, SCIP_Lp::nrows, NULL, SCIP_LpSolVals::primalfeasible, SCIP_Lp::primalfeasible, SCIP_ColSolVals::primsol, SCIP_Col::primsol, SCIP_ColSolVals::redcost, SCIP_Col::redcost, SCIP_Lp::rows, SCIP_CALL, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIPlpGetLPI(), SCIPlpGetSolstat(), SCIPlpiIsPrimalInfeasible(), SCIPlpiWasSolved(), SCIPprobAllColsInLP(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIP_LpSolVals::solisbasic, SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by priceAndCutLoop(), SCIPsolveDiveLP(), and solveProbingLP().

SCIP_Real SCIPconflictGetInfeasibleLPTime

(

SCIP_CONFLICT *

conflict

)

gets time in seconds used for analyzing infeasible LP conflicts

Parameters

conflict

conflict analysis data

Definition at line 6271 of file conflict.c.

References SCIP_Conflict::inflpanalyzetime, NULL, and SCIPclockGetTime().

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNInfeasibleLPCalls

(

SCIP_CONFLICT *

conflict

)

gets number of calls to infeasible LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6281 of file conflict.c.

References SCIP_Conflict::ninflpcalls, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNInfeasibleLPSuccess

(

SCIP_CONFLICT *

conflict

)

gets number of calls to infeasible LP conflict analysis that yield at least one conflict constraint

Parameters

conflict

conflict analysis data

Definition at line 6291 of file conflict.c.

References SCIP_Conflict::ninflpsuccess, and NULL.

Referenced by printConflictStatistics(), and SCIPsolveCIP().

SCIP_Longint SCIPconflictGetNInfeasibleLPConflictConss

(

SCIP_CONFLICT *

conflict

)

gets number of conflict constraints detected in infeasible LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6301 of file conflict.c.

References SCIP_Conflict::ninflpconfconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNInfeasibleLPConflictLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in conflict constraints created in infeasible LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6311 of file conflict.c.

References SCIP_Conflict::ninflpconfliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNInfeasibleLPReconvergenceConss

(

SCIP_CONFLICT *

conflict

)

gets number of reconvergence constraints detected in infeasible LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6321 of file conflict.c.

References SCIP_Conflict::ninflpreconvconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNInfeasibleLPReconvergenceLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in reconvergence constraints created in infeasible LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6331 of file conflict.c.

References SCIP_Conflict::ninflpreconvliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNInfeasibleLPIterations

(

SCIP_CONFLICT *

conflict

)

gets number of LP iterations in infeasible LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6341 of file conflict.c.

References SCIP_Conflict::ninflpiterations, and NULL.

Referenced by printConflictStatistics().

SCIP_Real SCIPconflictGetBoundexceedingLPTime

(

SCIP_CONFLICT *

conflict

)

gets time in seconds used for analyzing bound exceeding LP conflicts

Parameters

conflict

conflict analysis data

Definition at line 6351 of file conflict.c.

References SCIP_Conflict::boundlpanalyzetime, NULL, and SCIPclockGetTime().

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNBoundexceedingLPCalls

(

SCIP_CONFLICT *

conflict

)

gets number of calls to bound exceeding LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6361 of file conflict.c.

References SCIP_Conflict::nboundlpcalls, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNBoundexceedingLPSuccess

(

SCIP_CONFLICT *

conflict

)

gets number of calls to bound exceeding LP conflict analysis that yield at least one conflict constraint

Parameters

conflict

conflict analysis data

Definition at line 6371 of file conflict.c.

References SCIP_Conflict::nboundlpsuccess, and NULL.

Referenced by printConflictStatistics(), and SCIPsolveCIP().

SCIP_Longint SCIPconflictGetNBoundexceedingLPConflictConss

(

SCIP_CONFLICT *

conflict

)

gets number of conflict constraints detected in bound exceeding LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6381 of file conflict.c.

References SCIP_Conflict::nboundlpconfconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNBoundexceedingLPConflictLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in conflict constraints created in bound exceeding LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6391 of file conflict.c.

References SCIP_Conflict::nboundlpconfliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNBoundexceedingLPReconvergenceConss

(

SCIP_CONFLICT *

conflict

)

gets number of reconvergence constraints detected in bound exceeding LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6401 of file conflict.c.

References SCIP_Conflict::nboundlpreconvconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNBoundexceedingLPReconvergenceLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in reconvergence constraints created in bound exceeding LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6411 of file conflict.c.

References SCIP_Conflict::nboundlpreconvliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNBoundexceedingLPIterations

(

SCIP_CONFLICT *

conflict

)

gets number of LP iterations in bound exceeding LP conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6421 of file conflict.c.

References SCIP_Conflict::nboundlpiterations, and NULL.

Referenced by printConflictStatistics().

SCIP_RETCODE SCIPconflictAnalyzeStrongbranch	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	transprob,
		SCIP_PROB *	origprob,
		SCIP_TREE *	tree,
		SCIP_LP *	lp,
		SCIP_BRANCHCAND *	branchcand,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_COL *	col,
		SCIP_Bool *	downconflict,
		SCIP_Bool *	upconflict
	)

analyses infeasible strong branching sub problems for conflicts

Parameters

conflict	conflict analysis data
blkmem	block memory buffers
set	global SCIP settings
stat	dynamic problem statistics
transprob	transformed problem
origprob	original problem
tree	branch and bound tree
lp	LP data
branchcand	branching candidate storage
eventqueue	event queue
col	LP column with at least one infeasible strong branching subproblem
downconflict	pointer to store whether a conflict constraint was created for an infeasible downwards branch, or NULL
upconflict	pointer to store whether a conflict constraint was created for an infeasible upwards branch, or NULL

Definition at line 6438 of file conflict.c.

References SCIP_Set::conf_enable, SCIP_Set::conf_usesb, conflictAnalyzeLP(), SCIP_Stat::conflictlptime, SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, SCIP_Col::lb, SCIP_Lp::lpi, SCIP_Col::lpipos, SCIP_Set::nconflicthdlrs, SCIP_Stat::nconflictlpiterations, SCIP_Stat::nconflictlps, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, SCIP_Conflict::nsbcalls, SCIP_Conflict::nsbconfconss, SCIP_Conflict::nsbconfliterals, SCIP_Conflict::nsbiterations, SCIP_Conflict::nsbreconvconss, SCIP_Conflict::nsbreconvliterals, SCIP_Conflict::nsbsuccess, NULL, SCIP_Col::primsol, SCIP_Conflict::sbanalyzetime, SCIP_Col::sbdown, SCIP_Col::sbdownvalid, SCIP_Col::sbup, SCIP_Col::sbupvalid, SCIP_Bool, SCIP_CALL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPclockStart(), SCIPclockStop(), SCIPcolGetVar(), SCIPdebugMessage, SCIPlpiChgBounds(), SCIPlpiEndStrongbranch(), SCIPlpiGetBase(), SCIPlpiGetIterations(), SCIPlpiSetBase(), SCIPlpiSolveDual(), SCIPlpiStartStrongbranch(), SCIPprobAllColsInLP(), SCIPsetAllocBufferArray, SCIPsetFeasCeil(), SCIPsetFeasFloor(), SCIPsetFreeBufferArray, SCIPsetIsGE(), SCIPtreeGetCurrentDepth(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetUbLocal(), SCIP_Lp::solved, TRUE, and SCIP_Col::ub.

Referenced by analyzeStrongbranch().

SCIP_Real SCIPconflictGetStrongbranchTime

(

SCIP_CONFLICT *

conflict

)

gets time in seconds used for analyzing infeasible strong branching conflicts

Parameters

conflict

conflict analysis data

Definition at line 6667 of file conflict.c.

References NULL, SCIP_Conflict::sbanalyzetime, and SCIPclockGetTime().

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNStrongbranchCalls

(

SCIP_CONFLICT *

conflict

)

gets number of calls to infeasible strong branching conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6677 of file conflict.c.

References SCIP_Conflict::nsbcalls, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNStrongbranchSuccess

(

SCIP_CONFLICT *

conflict

)

gets number of calls to infeasible strong branching conflict analysis that yield at least one conflict constraint

Parameters

conflict

conflict analysis data

Definition at line 6687 of file conflict.c.

References SCIP_Conflict::nsbsuccess, and NULL.

Referenced by printConflictStatistics(), and SCIPsolveCIP().

SCIP_Longint SCIPconflictGetNStrongbranchConflictConss

(

SCIP_CONFLICT *

conflict

)

gets number of conflict constraints detected in infeasible strong branching conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6697 of file conflict.c.

References SCIP_Conflict::nsbconfconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNStrongbranchConflictLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in conflict constraints created in infeasible strong branching conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6707 of file conflict.c.

References SCIP_Conflict::nsbconfliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNStrongbranchReconvergenceConss

(

SCIP_CONFLICT *

conflict

)

gets number of reconvergence constraints detected in infeasible strong branching conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6717 of file conflict.c.

References SCIP_Conflict::nsbreconvconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNStrongbranchReconvergenceLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in reconvergence constraints created in infeasible strong branching conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6727 of file conflict.c.

References SCIP_Conflict::nsbreconvliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNStrongbranchIterations

(

SCIP_CONFLICT *

conflict

)

gets number of LP iterations in infeasible strong branching conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6737 of file conflict.c.

References SCIP_Conflict::nsbiterations, and NULL.

Referenced by printConflictStatistics().

SCIP_RETCODE SCIPconflictAnalyzePseudo	(	SCIP_CONFLICT *	conflict,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	transprob,
		SCIP_PROB *	origprob,
		SCIP_TREE *	tree,
		SCIP_LP *	lp,
		SCIP_BRANCHCAND *	branchcand,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_Bool *	success
	)

analyzes a pseudo solution with objective value exceeding the current cutoff to find out the bound changes on variables that were responsible for the objective value degradation; on success, calls standard conflict analysis with the responsible variables as starting conflict set, thus creating a conflict constraint out of the resulting conflict set; updates statistics for pseudo solution conflict analysis

Parameters

conflict	conflict analysis data
blkmem	block memory of transformed problem
set	global SCIP settings
stat	problem statistics
transprob	transformed problem
origprob	original problem
tree	branch and bound tree
lp	LP data
branchcand	branching candidate storage
eventqueue	event queue
success	pointer to store whether a conflict constraint was created, or NULL

Definition at line 6759 of file conflict.c.

References SCIP_Set::conf_enable, SCIP_Set::conf_usepseudo, conflictAnalyzeRemainingBdchgs(), SCIP_Lp::cutoffbound, FALSE, SCIP_Set::nconflicthdlrs, SCIP_Conflict::nconflictsets, SCIP_Var::nlbchginfos, SCIP_Conflict::npseudocalls, SCIP_Conflict::npseudoconfconss, SCIP_Conflict::npseudoconfliterals, SCIP_Conflict::npseudoreconvconss, SCIP_Conflict::npseudoreconvliterals, SCIP_Conflict::npseudosuccess, SCIP_Var::nubchginfos, NULL, SCIP_Prob::nvars, SCIP_Conflict::pseudoanalyzetime, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPclockStart(), SCIPclockStop(), SCIPconflictFlushConss(), SCIPdebugMessage, SCIPlpGetPseudoObjval(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPsetIsFeasEQ(), SCIPsetIsFeasGT(), SCIPsetIsInfinity(), SCIPsetSumepsilon(), SCIPtreeGetCurrentDepth(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetUbLocal(), undoBdchgsProof(), and SCIP_Prob::vars.

Referenced by applyBounding().

SCIP_Real SCIPconflictGetPseudoTime

(

SCIP_CONFLICT *

conflict

)

gets time in seconds used for analyzing pseudo solution conflicts

Parameters

conflict

conflict analysis data

Definition at line 6899 of file conflict.c.

References NULL, SCIP_Conflict::pseudoanalyzetime, and SCIPclockGetTime().

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNPseudoCalls

(

SCIP_CONFLICT *

conflict

)

gets number of calls to pseudo solution conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6909 of file conflict.c.

References SCIP_Conflict::npseudocalls, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNPseudoSuccess

(

SCIP_CONFLICT *

conflict

)

gets number of calls to pseudo solution conflict analysis that yield at least one conflict constraint

Parameters

conflict

conflict analysis data

Definition at line 6919 of file conflict.c.

References SCIP_Conflict::npseudosuccess, and NULL.

Referenced by printConflictStatistics(), and SCIPsolveCIP().

SCIP_Longint SCIPconflictGetNPseudoConflictConss

(

SCIP_CONFLICT *

conflict

)

gets number of conflict constraints detected in pseudo solution conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6929 of file conflict.c.

References SCIP_Conflict::npseudoconfconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNPseudoConflictLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in conflict constraints created in pseudo solution conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6939 of file conflict.c.

References SCIP_Conflict::npseudoconfliterals, and NULL.

Referenced by printConflictStatistics().

SCIP_Longint SCIPconflictGetNPseudoReconvergenceConss

(

SCIP_CONFLICT *

conflict

)

gets number of reconvergence constraints detected in pseudo solution conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6949 of file conflict.c.

References SCIP_Conflict::npseudoreconvconss, and NULL.

Referenced by printConflictStatistics(), and SCIPgetNConflictConssFound().

SCIP_Longint SCIPconflictGetNPseudoReconvergenceLiterals

(

SCIP_CONFLICT *

conflict

)

gets total number of literals in reconvergence constraints created in pseudo solution conflict analysis

Parameters

conflict

conflict analysis data

Definition at line 6959 of file conflict.c.

References SCIP_Conflict::npseudoreconvliterals, and NULL.

Referenced by printConflictStatistics().

void SCIPconflictEnableOrDisableClocks	(	SCIP_CONFLICT *	conflict,
		SCIP_Bool	enable
	)

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

Parameters

conflict	the conflict analysis data for which all clocks should be enabled or disabled
enable	should the clocks of the conflict analysis data be enabled?

Definition at line 6969 of file conflict.c.

References SCIP_Conflict::boundlpanalyzetime, SCIP_Conflict::dIBclock, SCIP_Conflict::inflpanalyzetime, NULL, SCIP_Conflict::propanalyzetime, SCIP_Conflict::pseudoanalyzetime, SCIP_Conflict::sbanalyzetime, and SCIPclockEnableOrDisable().

Referenced by SCIPconflictCreate(), and SCIPenableOrDisableStatisticTiming().