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:

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.
Remove the top bound change b from the priority queue.
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.
If priority queue is non-empty, goto step 2.
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)

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)

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 4935 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_CALL, SCIP_OKAY, SCIPconflicthdlrGetName(), and SCIPdebugMessage.

Referenced by SCIPsetCopyPlugins().

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_CALL, SCIP_OKAY, and SCIPclockFree().

Referenced by SCIPsetFree().

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

Referenced by SCIPsetInitPlugins().

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_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, and SCIP_Conflicthdlr::setuptime.

Referenced by SCIPsetExitPlugins().

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_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Conflicthdlr::setuptime.

Referenced by SCIPsetInitsolPlugins().

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_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Conflicthdlr::setuptime.

Referenced by SCIPsetExitsolPlugins().

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

Referenced by conflictAddConflictCons().

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(), SCIPincludeDialogDefaultSet(), and SCIPsetFindConflicthdlr().

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 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.

Referenced by SCIPsetIncludeConflicthdlr().

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 761 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 771 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 787 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 809 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 821 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 841 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 865 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 889 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 905 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 921 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 941 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 975 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 991 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 1018 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 1061 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 1104 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 1174 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 1340 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 1384 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 1431 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 1493 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 1518 of file conflict.c.

References 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 1613 of file conflict.c.

References 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 1631 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 1662 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, 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 1716 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 1781 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, checkRedundancy(), FALSE, SCIP_ConflictSet::nbdchginfos, NULL, SCIP_ConflictSet::relaxedbds, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIPbdchginfoGetBoundtype(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetVar(), SCIPboundtypeOpposite(), 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 2053 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, SCIP_BdChgInfo::boundtype, SCIP_ConflictSet::conflictdepth, detectImpliedBounds(), SCIP_Conflict::dIBclock, SCIP_Lp::diving, FALSE, SCIP_ConflictSet::nbdchginfos, 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 2189 of file conflict.c.

References 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 2365 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 2375 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 2385 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 2395 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 2405 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 2415 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 2425 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 2435 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 2445 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 2463 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 2479 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 2500 of file conflict.c.

References FALSE, 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 2516 of file conflict.c.

References BMSallocMemory, conflictsetCreate(), NULL, SCIP_ALLOC, SCIP_CALL, SCIP_CLOCKTYPE_DEFAULT, SCIP_OKAY, SCIPclockCreate(), and SCIPpqueueCreate().

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 2589 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 2622 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 2634 of file conflict.c.

References 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 2693 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 2781 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 2824 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 2844 of file conflict.c.

References SCIP_Conflict::bdchgqueue, 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 2890 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 2925 of file conflict.c.

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 2981 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 3042 of file conflict.c.

References SCIP_BdChgInfo::bdchgidx, conflictAddBound(), convertToActiveVar(), FALSE, MAX, MIN, NULL, SCIP_BdChgInfo::pos, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_FIXED, SCIP_VARSTATUS_MULTAGGR, SCIPbdchgidxGetPos(), SCIPbdchgidxIsEarlier(), SCIPbdchginfoGetDepth(), SCIPbdchginfoGetIdx(), SCIPbdchginfoGetNewbound(), SCIPbdchginfoGetOldbound(), SCIPbdchginfoGetPos(), SCIPbdchginfoIsRedundant(), SCIPconflictAddBound(), 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 3206 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 3266 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 3283 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 3299 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 3343 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 3397 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, 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 3496 of file conflict.c.

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 3704 of file conflict.c.

References bdchginfoIsResolvable(), SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, 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 3932 of file conflict.c.

References SCIP_ConflictSet::bdchginfos, SCIP_Conflict::bdchgqueue, SCIP_DomChgBound::boundchgs, 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 4212 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 4271 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 4281 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 4291 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 4301 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 4311 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 4321 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 4331 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 4341 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 4359 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 4398 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 4467 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 4539 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 4576 of file conflict.c.

References SCIP_BdChgInfo::bdchgidx, bdchginfoIsResolvable(), 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 4712 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 4744 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 4939 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 5147 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, SCIPsetIsFeasGT(), SCIPsetIsFeasNegative(), SCIPsetIsFeasPositive(), 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 5393 of file conflict.c.

References 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 5521 of file conflict.c.

References addSideRemoval(), SCIP_LPBdChgs::bdchginds, SCIP_LPBdChgs::bdchglbs, SCIP_LPBdChgs::bdchgubs, 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 5987 of file conflict.c.

References conflictAnalyzeLP(), FALSE, SCIP_Conflict::inflpanalyzetime, 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 6054 of file conflict.c.

References SCIP_Conflict::boundlpanalyzetime, conflictAnalyzeLP(), FALSE, SCIP_Conflict::nboundlpcalls, SCIP_Conflict::nboundlpconfconss, SCIP_Conflict::nboundlpconfliterals, SCIP_Conflict::nboundlpiterations, SCIP_Conflict::nboundlpreconvconss, SCIP_Conflict::nboundlpreconvliterals, SCIP_Conflict::nboundlpsuccess, 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 6122 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_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 6256 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 6266 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 6276 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 6286 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 6296 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 6306 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 6316 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 6326 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 6336 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 6346 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 6356 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 6366 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 6376 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 6386 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 6396 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 6406 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 6423 of file conflict.c.

References conflictAnalyzeLP(), SCIP_Stat::conflictlptime, SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, SCIP_Col::lb, SCIP_Lp::lpi, SCIP_Col::lpipos, 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 6652 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 6662 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 6672 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 6682 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 6692 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 6702 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 6712 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 6722 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