Examples with ExtensionalIndexExpressionsSet com.sri.ai.expresso.core.ExtensionalIndexExpressionsSet used on opensource projects

Example 36 with ExtensionalIndexExpressionsSet

use of com.sri.ai.expresso.core.ExtensionalIndexExpressionsSet in project aic-expresso by aic-sri-international.

the class ForAll method make.

public static Expression make(IndexExpressionsSet indexExpressions, Expression body) {
    Expression current = body;
    List<Expression> indexExpressionsList = ((ExtensionalIndexExpressionsSet) indexExpressions).getList();
    for (int i = indexExpressionsList.size() - 1; i >= 0; i--) {
        current = make(indexExpressionsList.get(i), current);
    }
    return current;
}

Example 37 with ExtensionalIndexExpressionsSet

use of com.sri.ai.expresso.core.ExtensionalIndexExpressionsSet in project aic-expresso by aic-sri-international.

the class ThereExists method make.

public static Expression make(IndexExpressionsSet indexExpressions, Expression body) {
    Expression current = body;
    List<Expression> indexExpressionsList = ((ExtensionalIndexExpressionsSet) indexExpressions).getList();
    for (int i = indexExpressionsList.size() - 1; i >= 0; i--) {
        current = make(indexExpressionsList.get(i), current);
    }
    return current;
}

Example 38 with ExtensionalIndexExpressionsSet

use of com.sri.ai.expresso.core.ExtensionalIndexExpressionsSet in project aic-expresso by aic-sri-international.

the class ContextTest method testExtendWith.

@Test
public void testExtendWith() {
    Context context;
    ExtensionalIndexExpressionsSet indexExpressions;
    ExtensionalIndexExpressionsSet expectedNewIndexExpressionsSet;
    Triple<Context, ExtensionalIndexExpressionsSet, Expression> triple;
    Map<Expression, Expression> symbolsAndTypes;
    Expression expressionInScope;
    Expression expectedNewExpressionInScope;
    context = new TrueContext();
    indexExpressions = new ExtensionalIndexExpressionsSet("X", "Integer", "Y", "X..10");
    expectedNewIndexExpressionsSet = new ExtensionalIndexExpressionsSet("X'", "Integer", "Y'", "X'..10");
    expressionInScope = parse("X = 1 and Y = 2");
    expectedNewExpressionInScope = parse("X' = 1 and Y' = 2");
    symbolsAndTypes = map(parse("X"), parse("Integer"), parse("Y"), parse("X..10"), parse("X'"), parse("Integer"), parse("Y'"), parse("X'..10"));
    context = context.extendWith(indexExpressions);
    triple = context.extendWith(indexExpressions, expressionInScope);
    println(triple);
    assertEquals(symbolsAndTypes, triple.first.getSymbolsAndTypes());
    assertEquals(expectedNewIndexExpressionsSet, triple.second);
    assertEquals(expectedNewExpressionInScope, triple.third);
}

Example 39 with ExtensionalIndexExpressionsSet

use of com.sri.ai.expresso.core.ExtensionalIndexExpressionsSet in project aic-expresso by aic-sri-international.

the class SampleMultiIndexQuantifierEliminator method computeMeasureAndDetermineIfShouldSample.

private Pair<Rational, Boolean> computeMeasureAndDetermineIfShouldSample(Expression index, Expression indexCondition, Expression additiveIdentityElement, Context context) {
    Pair<Rational, Boolean> result;
    Expression indexType = GrinderUtil.getTypeExpression(index, context);
    IndexExpressionsSet indexExpressionsSet = new ExtensionalIndexExpressionsSet(IndexExpressions.makeIndexExpression(index, indexType));
    Expression intensionalSet = IntensionalSet.intensionalMultiSet(indexExpressionsSet, index, indexCondition);
    Rational measureSetOfI = Measure.get(intensionalSet, context);
    boolean sample = true;
    if (!alwaysSample) {
        Type type = GrinderUtil.getType(index, context);
        // NOTE: We always sample from continuous domains
        if (type != null && type.isDiscrete()) {
            if (measureSetOfI.compareTo(sampleSizeN) <= 0) {
                // Domain is discrete and sample size is >= the size of the domain
                // so we don't want to sample in this instance
                sample = false;
            }
        }
    }
    result = new Pair<>(measureSetOfI, sample);
    return result;
}

Example 40 with ExtensionalIndexExpressionsSet

use of com.sri.ai.expresso.core.ExtensionalIndexExpressionsSet in project aic-expresso by aic-sri-international.

the class InversionSimplifier method applyInversion.

private static Expression applyInversion(Expression summationIndexedByFunction, Expression summationIndexFunctionName, FunctionType summationIndexFunctionType, List<Expression> originalQuantifierOrder, List<Expression> inversionQuantifierOrder, Context context) {
    Expression result;
    int indexOfSummationIndexedByFunction = inversionQuantifierOrder.indexOf(summationIndexedByFunction);
    // NOTE: only products will bubble up before the summation.
    List<Expression> productsBefore = inversionQuantifierOrder.subList(0, indexOfSummationIndexedByFunction);
    Expression lastQuantifierHead = getHead(originalQuantifierOrder.get(originalQuantifierOrder.size() - 1));
    Context innerContext = context;
    for (Expression quantifier : originalQuantifierOrder) {
        innerContext = innerContext.extendWith(getIndexExpressions(quantifier));
    }
    Context lastQuantifierHeadContext = innerContext;
    // TODO - remove temporary hack which collapses the function's argument domains
    // due to all the domain arguments being treated as constants. Instead should be using
    // set expression types on singletons.				
    // Determine which domain arguments from the summation function can be collapsed
    List<Expression> productsBeforeIndices = new ArrayList<>();
    for (Expression productBefore : productsBefore) {
        productsBeforeIndices.add(getIndexAndType(productBefore).first);
    }
    Set<Integer> domainArgsToRemove = new HashSet<>();
    Set<Integer> domainArgsHaveVar = new HashSet<>();
    new SubExpressionsDepthFirstIterator(lastQuantifierHead).forEachRemaining(e -> {
        if (e.hasFunctor(summationIndexFunctionName)) {
            for (int i = 0; i < e.numberOfArguments(); i++) {
                if (lastQuantifierHeadContext.getTheory().isVariable(e.get(0), lastQuantifierHeadContext)) {
                    domainArgsHaveVar.add(i);
                }
                if (productsBeforeIndices.contains(e.get(i)) || Util.thereExists(new SubExpressionsDepthFirstIterator(e.get(i)), es -> productsBeforeIndices.contains(es))) {
                    domainArgsToRemove.add(i);
                }
            }
        }
    });
    // Remove arg positions that were not populated by a variable.
    for (int i = 0; i < summationIndexFunctionType.getArity(); i++) {
        if (!domainArgsHaveVar.contains(i)) {
            domainArgsToRemove.add(i);
        }
    }
    List<Expression> argTypes = new ArrayList<>();
    for (int i = 0; i < summationIndexFunctionType.getArity(); i++) {
        if (!domainArgsToRemove.contains(i)) {
            argTypes.add(parse(summationIndexFunctionType.getArgumentTypes().get(i).getName()));
        }
    }
    Expression codomainType = parse(summationIndexFunctionType.getCodomain().getName());
    Expression summationIndexReducedType;
    if (argTypes.size() == 0) {
        summationIndexReducedType = codomainType;
    } else {
        summationIndexReducedType = FunctionType.make(codomainType, argTypes);
    }
    Expression summationIndex = IndexExpressions.makeIndexExpression(summationIndexFunctionName, summationIndexReducedType);
    Expression phi = lastQuantifierHead.replaceAllOccurrences(e -> {
        Expression r = e;
        if (e.hasFunctor(summationIndexFunctionName)) {
            List<Expression> argsToKeep = new ArrayList<>();
            for (int i = 0; i < e.numberOfArguments(); i++) {
                if (!domainArgsToRemove.contains(i)) {
                    argsToKeep.add(e.get(i));
                }
            }
            if (argsToKeep.size() > 0) {
                r = Expressions.apply(summationIndexFunctionName, argsToKeep);
            } else {
                r = summationIndexFunctionName;
            }
        }
        return r;
    }, lastQuantifierHeadContext);
    Expression summationHead = phi;
    for (int i = indexOfSummationIndexedByFunction + 1; i < inversionQuantifierOrder.size(); i++) {
        Expression quantifier = inversionQuantifierOrder.get(i);
        Expression quantifierIntensionalSet = IntensionalSet.intensionalMultiSet(getIndexExpressions(quantifier), summationHead, getCondition(quantifier));
        summationHead = Expressions.apply(quantifier.getFunctor(), quantifierIntensionalSet);
    }
    Expression innerSummation = IntensionalSet.intensionalMultiSet(new ExtensionalIndexExpressionsSet(summationIndex), summationHead, getCondition(summationIndexedByFunction));
    result = Expressions.apply(FunctorConstants.SUM, innerSummation);
    for (int i = productsBefore.size() - 1; i >= 0; i--) {
        Expression product = productsBefore.get(i);
        product = IntensionalSet.intensionalMultiSet(getIndexExpressions(product), result, getCondition(product));
        result = Expressions.apply(FunctorConstants.PRODUCT, product);
    }
    return result;
}