org.sat4j.pb.core
Class PBSolver

java.lang.Object
  org.sat4j.minisat.core.Solver<PBDataStructureFactory>
      org.sat4j.pb.core.PBSolver

All Implemented Interfaces:

Serializable, ICDCL<PBDataStructureFactory>, Learner, UnitPropagationListener, IPBCDCLSolver<PBDataStructureFactory>, IPBSolver, IProblem, ISolver, ISolverService

Direct Known Subclasses:

PBSolverCP, PBSolverResolution

public abstract class PBSolver
extends Solver<PBDataStructureFactory>
implements IPBCDCLSolver<PBDataStructureFactory>

See Also:

Serialized Form

Field Summary

LearnedConstraintsDeletionStrategy	objectiveFunctionBased
protected PBSolverStats	stats

Fields inherited from class org.sat4j.minisat.core.Solver

constrs, dsfactory, EXPENSIVE_SIMPLIFICATION, EXPENSIVE_SIMPLIFICATION_WLONLY, glucose, learnedConstraintsDeletionStrategy, learnts, memory_based, NO_SIMPLIFICATION, out, rootLevel, SIMPLE_SIMPLIFICATION, slistener, trail, trailLim, undertimeout, voc

Constructor Summary

PBSolver(LearningStrategy<PBDataStructureFactory> learner, PBDataStructureFactory dsf, IOrder order, RestartStrategy restarter)

PBSolver(LearningStrategy<PBDataStructureFactory> learner, PBDataStructureFactory dsf, SearchParams params, IOrder order, RestartStrategy restarter)

Method Summary

IConstr	addAtLeast(IVecInt literals, IVec<BigInteger> coeffs, BigInteger degree) Create a pseudo-boolean constraint of the type "at least".
IConstr	addAtLeast(IVecInt literals, IVecInt coeffs, int degree) Create a pseudo-boolean constraint of the type "at least".
IConstr	addAtMost(IVecInt literals, IVec<BigInteger> coeffs, BigInteger degree) Create a pseudo boolean constraint of the type "at most".
IConstr	addAtMost(IVecInt literals, IVecInt coeffs, int degree) Create a pseudo boolean constraint of the type "at most".
IConstr	addExactly(IVecInt literals, IVec<BigInteger> coeffs, BigInteger weight) Create a pseudo-boolean constraint of the type "subset sum".
IConstr	addExactly(IVecInt literals, IVecInt coeffs, int weight) Create a pseudo-boolean constraint of the type "subset sum".
IConstr	addPseudoBoolean(IVecInt literals, IVec<BigInteger> coeffs, boolean moreThan, BigInteger degree) Create a Pseudo-Boolean constraint of the type "at least n or at most n of those literals must be satisfied"
void	claBumpActivity(Constr arg0)
ObjectiveFunction	getObjectiveFunction() Retrieve the objective function from the solver.
void	setObjectiveFunction(ObjectiveFunction obj) Provide an objective function to the solver.

Methods inherited from class org.sat4j.minisat.core.Solver

addAllClauses, addAtLeast, addAtMost, addBlockingClause, addClause, addClause, addConstr, addExactly, analyze, analyzeAtRootLevel, analyzeFinalConflictInTermsOfAssumptions, assume, backtrack, cancelUntil, claBumpActivity, clearLearntClauses, currentDecisionLevel, decayActivities, decisionLevel, dimacs2internal, enqueue, enqueue, expireTimeout, findModel, findModel, fixedSize, getDSFactory, getIthConstr, getLearnedConstraints, getLiteralsPropagatedAt, getLogger, getLogPrefix, getOrder, getOutLearnt, getRestartStrategy, getSearchListener, getSimplifier, getStat, getStats, getTimeout, getTimeoutMs, getVariableHeuristics, getVocabulary, initStats, isDBSimplificationAllowed, isNeedToReduceDB, isSatisfiable, isSatisfiable, isSatisfiable, isSatisfiable, isSolverKeptHot, isVerbose, learn, model, model, modelWithInternalVariables, nAssigns, nConstraints, newVar, newVar, nextFreeVarId, nVars, primeImplicant, primeImplicant, printInfos, printLearntClausesInfos, printStat, printStat, propagate, realNumberOfVariables, reduceDB, registerLiteral, removeConstr, removeSubsumedConstr, reset, setDataStructureFactory, setDBSimplificationAllowed, setExpectedNumberOfClauses, setKeepSolverHot, setLearnedConstraintsDeletionStrategy, setLearnedConstraintsDeletionStrategy, setLearnedConstraintsDeletionStrategy, setLearner, setLogger, setLogPrefix, setNeedToReduceDB, setOrder, setRestartStrategy, setSearchListener, setSearchParams, setSimplifier, setSimplifier, setTimeout, setTimeoutMs, setTimeoutOnConflicts, setVerbose, simplifyDB, sortOnActivity, stop, suggestNextLiteralToBranchOn, toString, toString, truthValue, undoOne, unsatExplanation, unset, varBumpActivity

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.sat4j.minisat.core.ICDCL

getLogger, getOrder, getRestartStrategy, getSimplifier, setDataStructureFactory, setLearnedConstraintsDeletionStrategy, setLearnedConstraintsDeletionStrategy, setLearnedConstraintsDeletionStrategy, setLearner, setLogger, setNeedToReduceDB, setOrder, setRestartStrategy, setSearchParams, setSimplifier, setSimplifier

Methods inherited from interface org.sat4j.specs.ISolver

addAllClauses, addAtLeast, addAtMost, addBlockingClause, addClause, addExactly, clearLearntClauses, expireTimeout, getLogPrefix, getSearchListener, getStat, getTimeout, getTimeoutMs, isDBSimplificationAllowed, isSolverKeptHot, isVerbose, modelWithInternalVariables, newVar, nextFreeVarId, printStat, printStat, realNumberOfVariables, registerLiteral, removeConstr, removeSubsumedConstr, reset, setDBSimplificationAllowed, setExpectedNumberOfClauses, setKeepSolverHot, setLogPrefix, setSearchListener, setTimeout, setTimeoutMs, setTimeoutOnConflicts, setVerbose, toString, unsatExplanation

Methods inherited from interface org.sat4j.specs.IProblem

findModel, findModel, isSatisfiable, isSatisfiable, isSatisfiable, isSatisfiable, model, model, nConstraints, newVar, nVars, primeImplicant, primeImplicant, printInfos

Methods inherited from interface org.sat4j.minisat.core.UnitPropagationListener

enqueue, enqueue, unset

Methods inherited from interface org.sat4j.minisat.core.VarActivityListener

varBumpActivity

Methods inherited from interface org.sat4j.minisat.core.Learner

learn

Field Detail

stats

protected PBSolverStats stats

objectiveFunctionBased

public final LearnedConstraintsDeletionStrategy objectiveFunctionBased

Since:

2.1

Constructor Detail

PBSolver

public PBSolver(LearningStrategy<PBDataStructureFactory> learner,
                PBDataStructureFactory dsf,
                IOrder order,
                RestartStrategy restarter)

PBSolver

public PBSolver(LearningStrategy<PBDataStructureFactory> learner,
                PBDataStructureFactory dsf,
                SearchParams params,
                IOrder order,
                RestartStrategy restarter)

Method Detail

addPseudoBoolean

public IConstr addPseudoBoolean(IVecInt literals,
                                IVec<BigInteger> coeffs,
                                boolean moreThan,
                                BigInteger degree)
                         throws ContradictionException

Description copied from interface: IPBSolver

Create a Pseudo-Boolean constraint of the type "at least n or at most n of those literals must be satisfied"

Specified by:

addPseudoBoolean in interface IPBSolver

Parameters:

literals - a set of literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

coeffs - the coefficients of the literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

moreThan - true if it is a constraint >= degree, false if it is a constraint <= degree

degree - the degree of the cardinality constraint

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the vector of literals is empty or if the constraint is falsified after unit propagation

See Also:

ISolver.removeConstr(IConstr)

setObjectiveFunction

public void setObjectiveFunction(ObjectiveFunction obj)

Description copied from interface: IPBSolver

Provide an objective function to the solver.

Specified by:

setObjectiveFunction in interface IPBSolver

Parameters:

obj - the objective function

getObjectiveFunction

public ObjectiveFunction getObjectiveFunction()

Description copied from interface: IPBSolver

Retrieve the objective function from the solver.

Specified by:

getObjectiveFunction in interface IPBSolver

Returns:

the objective function

addAtMost

public IConstr addAtMost(IVecInt literals,
                         IVecInt coeffs,
                         int degree)
                  throws ContradictionException

Description copied from interface: IPBSolver

Create a pseudo boolean constraint of the type "at most".

Specified by:

addAtMost in interface IPBSolver

Parameters:

literals - a set of literals The vector can be reused since the solver is not supposed to keep a reference to that vector.

coeffs - the coefficients of the literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

degree - the degree of the pseudo-boolean constraint

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the constraint is found trivially unsat.

See Also:

ISolver.removeConstr(IConstr)

addAtMost

public IConstr addAtMost(IVecInt literals,
                         IVec<BigInteger> coeffs,
                         BigInteger degree)
                  throws ContradictionException

Description copied from interface: IPBSolver

Create a pseudo boolean constraint of the type "at most".

Specified by:

addAtMost in interface IPBSolver

Parameters:

literals - a set of literals The vector can be reused since the solver is not supposed to keep a reference to that vector.

coeffs - the coefficients of the literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

degree - the degree of the pseudo-boolean constraint

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the constraint is found trivially unsat.

See Also:

ISolver.removeConstr(IConstr)

addAtLeast

public IConstr addAtLeast(IVecInt literals,
                          IVecInt coeffs,
                          int degree)
                   throws ContradictionException

Description copied from interface: IPBSolver

Create a pseudo-boolean constraint of the type "at least".

Specified by:

addAtLeast in interface IPBSolver

Parameters:

literals - a set of literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

coeffs - the coefficients of the literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

degree - the degree of the pseudo-boolean constraint

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the constraint is found trivially unsat.

See Also:

ISolver.removeConstr(IConstr)

addAtLeast

public IConstr addAtLeast(IVecInt literals,
                          IVec<BigInteger> coeffs,
                          BigInteger degree)
                   throws ContradictionException

Description copied from interface: IPBSolver

Create a pseudo-boolean constraint of the type "at least".

Specified by:

addAtLeast in interface IPBSolver

Parameters:

literals - a set of literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

coeffs - the coefficients of the literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

degree - the degree of the pseudo-boolean constraint

Returns:

a reference to the constraint added in the solver, to use in removeConstr().

Throws:

ContradictionException - iff the constraint is found trivially unsat.

See Also:

ISolver.removeConstr(IConstr)

addExactly

public IConstr addExactly(IVecInt literals,
                          IVecInt coeffs,
                          int weight)
                   throws ContradictionException

Description copied from interface: IPBSolver

Create a pseudo-boolean constraint of the type "subset sum".

Specified by:

addExactly in interface IPBSolver

Parameters:

literals - a set of literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

coeffs - the coefficients of the literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

weight - the number of literals that must be satisfied

Returns:

a reference to the constraint added to the solver. It might return an object representing a group of constraints.

Throws:

ContradictionException - iff the constraint is trivially unsatisfiable.

addExactly

public IConstr addExactly(IVecInt literals,
                          IVec<BigInteger> coeffs,
                          BigInteger weight)
                   throws ContradictionException

Description copied from interface: IPBSolver

Create a pseudo-boolean constraint of the type "subset sum".

Specified by:

addExactly in interface IPBSolver

Parameters:

literals - a set of literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

coeffs - the coefficients of the literals. The vector can be reused since the solver is not supposed to keep a reference to that vector.

weight - the number of literals that must be satisfied

Returns:

a reference to the constraint added to the solver. It might return an object representing a group of constraints.

Throws:

ContradictionException - iff the constraint is trivially unsatisfiable.

claBumpActivity

public void claBumpActivity(Constr arg0)