Examples with AtomStore at.ac.tuwien.kr.alpha.core.common.AtomStore used on opensource projects

Example 11 with AtomStore

use of at.ac.tuwien.kr.alpha.core.common.AtomStore in project Alpha by alpha-asp.

the class AlphaImpl method prepareSolverFor.

/**
 * Prepares a solver (and accompanying grounder) instance pre-loaded with the given program. Use this if the
 * solver is needed after reading answer sets (e.g. for obtaining statistics).
 *
 * @param program the program to solve.
 * @param filter  a (java util) predicate that filters (asp-)predicates which should be contained in the answer
 *                set stream from the solver.
 * @return a solver (and accompanying grounder) instance pre-loaded with the given program.
 */
private Solver prepareSolverFor(CompiledProgram program, java.util.function.Predicate<Predicate> filter) {
    String grounderName = config.getGrounderName();
    boolean doDebugChecks = config.isDebugInternalChecks();
    GrounderHeuristicsConfiguration grounderHeuristicConfiguration = GrounderHeuristicsConfiguration.getInstance(config.getGrounderToleranceConstraints(), config.getGrounderToleranceRules());
    grounderHeuristicConfiguration.setAccumulatorEnabled(config.isGrounderAccumulatorEnabled());
    AtomStore atomStore = new AtomStoreImpl();
    Grounder grounder = GrounderFactory.getInstance(grounderName, program, atomStore, filter, grounderHeuristicConfiguration, doDebugChecks);
    return SolverFactory.getInstance(config, atomStore, grounder);
}

Example 12 with AtomStore

use of at.ac.tuwien.kr.alpha.core.common.AtomStore in project Alpha by alpha-asp.

the class TestUtils method buildSolverFromSystemConfig.

private static Solver buildSolverFromSystemConfig(ASPCore2Program prog, SystemConfig cfg) {
    AtomStore atomStore = new AtomStoreImpl();
    NormalProgram normalProg = new NormalizeProgramTransformation(cfg.getAggregateRewritingConfig()).apply(prog);
    InternalProgram preprocessed = cfg.isEvaluateStratifiedPart() ? new StratifiedEvaluation().apply(AnalyzedProgram.analyzeNormalProgram(normalProg)) : InternalProgram.fromNormalProgram(normalProg);
    return SolverFactory.getInstance(cfg, atomStore, GrounderFactory.getInstance(cfg.getGrounderName(), preprocessed, atomStore, cfg.isDebugInternalChecks()));
}

Example 13 with AtomStore

use of at.ac.tuwien.kr.alpha.core.common.AtomStore in project Alpha by alpha-asp.

the class NoGoodGeneratorTest method collectNeg_ContainsOnlyPositiveLiterals.

/**
 * Calls {@link NoGoodGenerator#collectNegLiterals(InternalRule, Substitution)}, which puts the atom occurring
 * negatively in a rule into the atom store. It is then checked whether the atom in the atom store is positive.
 */
@Test
public void collectNeg_ContainsOnlyPositiveLiterals() {
    ASPCore2Program input = PARSER.parse("p(a,b). " + "q(a,b) :- not nq(a,b). " + "nq(a,b) :- not q(a,b).");
    NormalProgram normal = NORMALIZE_TRANSFORM.apply(input);
    CompiledProgram program = InternalProgram.fromNormalProgram(normal);
    CompiledRule rule = program.getRules().get(1);
    AtomStore atomStore = new AtomStoreImpl();
    Grounder grounder = GrounderFactory.getInstance("naive", program, atomStore, true);
    NoGoodGenerator noGoodGenerator = ((NaiveGrounder) grounder).noGoodGenerator;
    Substitution substitution = new BasicSubstitution();
    substitution.put(X, A);
    substitution.put(Y, B);
    List<Integer> collectedNeg = noGoodGenerator.collectNegLiterals(rule, substitution);
    assertEquals(1, collectedNeg.size());
    String negAtomString = atomStore.atomToString(Literals.atomOf(collectedNeg.get(0)));
    assertEquals("q(a, b)", negAtomString);
}

Example 14 with AtomStore

use of at.ac.tuwien.kr.alpha.core.common.AtomStore in project Alpha by alpha-asp.

the class SolverTests method dummyGrounder.

@RegressionTest
public void dummyGrounder(RegressionTestConfig cfg) {
    AtomStore atomStore = new AtomStoreImpl();
    assertEquals(DummyGrounder.EXPECTED, buildSolverForRegressionTest(atomStore, new DummyGrounder(atomStore), cfg).collectSet());
}

Example 15 with AtomStore

use of at.ac.tuwien.kr.alpha.core.common.AtomStore in project Alpha by alpha-asp.

the class LiteralInstantiationStrategyTest method defaultLazyGroundingSubstituteNonGroundLiteralWithTrueInstance.

/**
 * Uses {@link DefaultLazyGroundingInstantiationStrategy} to find the ground
 * instance "q(a, b)" for the partially ground positive literal "q(a, X)".
 *
 * In this case, the instantiation strategy has an assignment where q(a, b) is
 * assigned ThriceTruth.TRUE, so we expect the assignment status (i.e.
 * assignment status of the found ground instance) passed back with the
 * substitution to be TRUE. Furthermore, we expect the stale atom set to stay
 * empty.
 */
@Test
public void defaultLazyGroundingSubstituteNonGroundLiteralWithTrueInstance() {
    Predicate q = Predicates.getPredicate("q", 2);
    BasicAtom nonGroundAtom = Atoms.newBasicAtom(q, Terms.newSymbolicConstant("a"), Terms.newVariable("X"));
    WorkingMemory workingMemory = new WorkingMemory();
    workingMemory.initialize(q);
    workingMemory.addInstance(Atoms.newBasicAtom(q, Terms.newSymbolicConstant("a"), Terms.newSymbolicConstant("b")), true);
    AtomStore atomStore = new AtomStoreImpl();
    WritableAssignment assignment = new TrailAssignment(atomStore);
    BasicAtom groundAtom = Atoms.newBasicAtom(q, Terms.newSymbolicConstant("a"), Terms.newSymbolicConstant("b"));
    atomStore.putIfAbsent(groundAtom);
    assignment.growForMaxAtomId();
    assignment.assign(atomStore.get(groundAtom), ThriceTruth.TRUE);
    LinkedHashSet<Atom> staleSet = new LinkedHashSet<>();
    DefaultLazyGroundingInstantiationStrategy strategy = new DefaultLazyGroundingInstantiationStrategy(workingMemory, atomStore, Collections.emptyMap(), false);
    strategy.setStaleWorkingMemoryEntries(staleSet);
    strategy.setCurrentAssignment(assignment);
    List<ImmutablePair<Substitution, AssignmentStatus>> result = strategy.getAcceptedSubstitutions(Literals.fromAtom(nonGroundAtom, true), new BasicSubstitution());
    assertEquals(1, result.size());
    ImmutablePair<Substitution, AssignmentStatus> substitutionInfo = result.get(0);
    Substitution substitution = substitutionInfo.left;
    AssignmentStatus assignmentStatus = substitutionInfo.right;
    assertEquals(AssignmentStatus.TRUE, assignmentStatus);
    assertTrue(substitution.isVariableSet(Terms.newVariable("X")));
    assertEquals(Terms.newSymbolicConstant("b"), substitution.eval(Terms.newVariable("X")));
    assertTrue(staleSet.isEmpty());
}