Examples with Type com.sri.ai.expresso.api.Type used on opensource projects

Example 41 with Type

use of com.sri.ai.expresso.api.Type in project aic-expresso by aic-sri-international.

the class BPTest method generateProbability.

private static Expression generateProbability(Context context, int i, Expression... listOfVariables) {
    if (listOfVariables.length == 0) {
        return null;
    }
    // randomNumberGenerator();
    Expression result = makeSymbol(0);
    Expression variable = listOfVariables[i];
    // listOfVariables.remove(0);
    Type type = context.getTypeOfRegisteredSymbol(variable);
    Iterator<Expression> iteratorToValuesInType = type.iterator();
    if (listOfVariables.length == i + 1) {
        for (Expression value : in(iteratorToValuesInType)) {
            Expression varEqualsValue = apply(EQUAL, variable, value);
            Expression randProbability = randomNumberGenerator();
            result = apply(IF_THEN_ELSE, varEqualsValue, randProbability, result);
        }
    } else {
        for (Expression value : in(iteratorToValuesInType)) {
            Expression varEqualsValue = apply(EQUAL, variable, value);
            Expression randProbability = generateProbability(context, i + 1, listOfVariables);
            result = apply(IF_THEN_ELSE, varEqualsValue, randProbability, result);
        }
    }
    return result;
}

Example 42 with Type

use of com.sri.ai.expresso.api.Type in project aic-expresso by aic-sri-international.

the class Context method extendWith.

/**
 * Extends context with index expressions, taking into account that new contextual variables may collide with existing ones.
 * In this case, it renames the incoming variables to unique identifiers and replaces them in the types of remaining
 * index expressions. It also renames these indices if they occur in a given expression --
 * this is useful because the client code (invoking this method)
 * often knows that these renamed indices may occur in a known set of expressions that need to be updated accordingly.
 * Returns the new context, the index expressions and expression in scope after the renaming.
 * @param indexExpressions
 * @param expressionInScope
 * @return the new context and the index expressions and expression in scope after the renaming
 */
default Triple<Context, ExtensionalIndexExpressionsSet, Expression> extendWith(ExtensionalIndexExpressionsSet indexExpressions, Expression expressionInScope) {
    Triple<Context, ExtensionalIndexExpressionsSet, Expression> result;
    if (thereExists(getIndices(indexExpressions), index -> this.containsSymbol(index))) {
        // OPTIMIZATION: only kick in this entire procedure when extending with symbol in the context (previous ones could have been dealt with normally).
        // the objects to be returned in the triple:
        Context newContext = this;
        ArrayList<Expression> newIndexExpressionsList = new ArrayList<>(indexExpressions.getList());
        Expression newExpressionInScope = expressionInScope;
        // Collects all existing symbols to be able to create unique symbols
        Set<Expression> alreadyDefined = Util.set();
        alreadyDefined.addAll(this.getSymbols());
        alreadyDefined.addAll(Expressions.freeSymbols(new DefaultTuple(newIndexExpressionsList), this));
        alreadyDefined.addAll(Expressions.freeSymbols(expressionInScope, this));
        Predicate<Expression> isAlreadyDefined = e -> alreadyDefined.contains(e);
        for (int i = 0; i != newIndexExpressionsList.size(); i++) {
            Expression indexExpression = newIndexExpressionsList.get(i);
            Symbol index = (Symbol) indexExpression.get(0);
            Expression type = indexExpression.get(1);
            PairOf<Expression> newIndexAndNewExpressionInScope = Expressions.standardizeApart(index, isAlreadyDefined, newExpressionInScope);
            Expression newIndex = newIndexAndNewExpressionInScope.first;
            newExpressionInScope = newIndexAndNewExpressionInScope.second;
            // type should not contain the index
            Expression newIndexExpression = apply(IN, newIndex, type);
            newIndexExpressionsList.set(i, newIndexExpression);
            alreadyDefined.add(newIndex);
            for (int j = i + 1; j != newIndexExpressionsList.size(); j++) {
                Expression anotherIndexExpression = newIndexExpressionsList.get(j);
                Expression anotherIndex = anotherIndexExpression.get(0);
                Expression anotherType = anotherIndexExpression.get(1);
                Expression newAnotherType = anotherType.replaceSymbol(index, newIndex, this);
                // anotherIndex is a symbols and does not contain index
                Expression newAnotherIndexExpression = apply(IN, anotherIndex, newAnotherType);
                newIndexExpressionsList.set(j, newAnotherIndexExpression);
            }
        }
        ExtensionalIndexExpressionsSet newIndexExpressions = new ExtensionalIndexExpressionsSet(newIndexExpressionsList);
        newContext = newContext.extendWith(newIndexExpressions);
        result = triple(newContext, newIndexExpressions, newExpressionInScope);
    } else {
        // no collision; usual extension and the expressions do not change.
        result = triple(extendWith(indexExpressions), indexExpressions, expressionInScope);
    }
    return result;
}

Example 43 with Type

use of com.sri.ai.expresso.api.Type in project aic-expresso by aic-sri-international.

the class Theory method makeSingleVariableConstraint.

/**
 * Make a new single-variable constraint for this theory.
 * Default implementation checks suitability of type and invokes {@link #makeSingleVariableConstraint(Expression, Context)}.
 * @param variable
 * @param context
 * @return the constraint, or null if there is no theory for the variable.
 */
default SingleVariableConstraint makeSingleVariableConstraint(Expression variable, Context context) {
    Type variableType = context.getTypeOfRegisteredSymbol(variable);
    myAssert(context.getTheory().isSuitableFor(variableType), () -> this + " does not know how to make constraints for variable " + variable + " of type " + variableType);
    SingleVariableConstraint result = makeSingleVariableConstraintAfterBookkeeping(variable, context);
    return result;
}

Example 44 with Type

use of com.sri.ai.expresso.api.Type in project aic-expresso by aic-sri-international.

the class Compilation method compile.

/**
 * Compiles an expression to a normalized (decision-tree-like) expression.
 * @param inputExpression
 * @param mapFromVariableNameToTypeName
 * @param mapFromCategoricalTypeNameToSizeString
 * @param additionalTypes
 * @param solverListener if not null, invoked on solver used for compilation, before and after compilation starts; returned solver on 'before' invocation is used (it may be the same one used as argument, of course).
 * @return
 */
public static Expression compile(Expression inputExpression, Theory theory, Map<String, String> mapFromVariableNameToTypeName, Map<String, String> mapFromUniquelyNamedConstantToTypeName, Map<String, String> mapFromCategoricalTypeNameToSizeString, Collection<Type> additionalTypes, Function<MultiQuantifierEliminator, MultiQuantifierEliminator> solverListener) {
    // the group actually does not matter, because we are not going to have any indices.
    AssociativeCommutativeGroup group = new Max();
    // The solver for the parameters above.
    MultiQuantifierEliminator solver = new DefaultMultiQuantifierEliminator();
    if (solverListener != null) {
        solver = solverListener.apply(solver);
    }
    // We use the Prolog convention of small-letter initials for constants, but we need an exception for the random variables.
    Predicate<Expression> isPrologConstant = new PrologConstantPredicate();
    Predicate<Expression> isUniquelyNamedConstantPredicate = e -> isPrologConstant.apply(e) && !mapFromVariableNameToTypeName.containsKey(e);
    Map<String, String> mapFromSymbolNameToTypeName = new LinkedHashMap<>(mapFromVariableNameToTypeName);
    mapFromSymbolNameToTypeName.putAll(mapFromUniquelyNamedConstantToTypeName);
    // Solve the problem.
    // no indices; we want to keep all variables
    List<Expression> indices = Util.list();
    Expression result = solver.solve(group, inputExpression, indices, mapFromSymbolNameToTypeName, mapFromCategoricalTypeNameToSizeString, additionalTypes, isUniquelyNamedConstantPredicate, theory);
    if (solverListener != null) {
        solverListener.apply(null);
    }
    return result;
}

Example 45 with Type

use of com.sri.ai.expresso.api.Type in project aic-expresso by aic-sri-international.

the class Measure method get.

public static Rational get(Expression intensionalSetExpression, Context context) {
    Rational result;
    if (Sets.isIntensionalSet(intensionalSetExpression)) {
        IntensionalSet intensionalSet = (IntensionalSet) intensionalSetExpression;
        IndexExpressionsSet indexExpressionsSet = intensionalSet.getIndexExpressions();
        List<Expression> indices = IndexExpressions.getIndices(indexExpressionsSet);
        if (indices.size() == 1) {
            Expression evaluatedResult;
            Expression intensionalSetIndex = indices.get(0);
            Expression intensionalSetHead = intensionalSet.getHead();
            if (!intensionalSetHead.equals(intensionalSetIndex)) {
                throw new UnsupportedOperationException("Index and Head must be the same to calculate the meaure of an Intensional : " + intensionalSet);
            }
            Expression intensionalSetCondition = intensionalSet.getCondition();
            Context intensionalSetContext = context.extendWith(indexExpressionsSet);
            Type indexType = GrinderUtil.getTypeOfExpression(intensionalSetIndex, intensionalSetContext);
            if (intensionalSetCondition.equals(false)) {
                // short circuit known empty sets up front.
                evaluatedResult = Expressions.ZERO;
            } else if (indexType instanceof RealExpressoType || indexType instanceof RealInterval) {
                // NOTE : For Reals can always assume the condition is of this type.
                SingleVariableLinearRealArithmeticConstraint svConstraint = (SingleVariableLinearRealArithmeticConstraint) intensionalSetCondition;
                MeasureOfSingleVariableLinearRealArithmeticConstraintStepSolver realSolver = new MeasureOfSingleVariableLinearRealArithmeticConstraintStepSolver(svConstraint);
                evaluatedResult = realSolver.solve(intensionalSetContext);
            } else if (indexType instanceof FunctionType) {
                if (!intensionalSetCondition.equals(true)) {
                    throw new UnsupportedOperationException("Measure of intensional set with a function type domain currently do not support conditions: " + intensionalSet);
                }
                // measure(co-domain)^measure(domain)
                FunctionType indexFunctionType = (FunctionType) indexType;
                Expression condomainIntensionalSet = constructComponentIntensionalSet(indexFunctionType.getCodomain(), intensionalSet, ZERO, intensionalSetContext);
                Rational codomainMeasure = get(condomainIntensionalSet, intensionalSetContext);
                Rational domainMeasure = Rational.ONE;
                for (Type argDomainType : indexFunctionType.getArgumentTypes()) {
                    Expression argDomainIntensionalSet = constructComponentIntensionalSet(argDomainType, intensionalSet, ZERO, intensionalSetContext);
                    Rational argMeasure = get(argDomainIntensionalSet, intensionalSetContext);
                    domainMeasure = domainMeasure.multiply(argMeasure);
                }
                evaluatedResult = Expressions.makeSymbol(codomainMeasure.pow(domainMeasure.intValueExact()));
            } else if (indexType instanceof TupleType) {
                if (!intensionalSetCondition.equals(true)) {
                    throw new UnsupportedOperationException("Measure of intensional set with a tuple type domain currently do not support conditions: " + intensionalSet);
                }
                // (element_1, ..., element_n) = measure(element_1) * ... * measure(element_n)
                TupleType indexTupleType = (TupleType) indexType;
                Rational elementMeasuresProduct = Rational.ONE;
                for (Type elementType : indexTupleType.getElementTypes()) {
                    Expression elementDomainIntensionalSet = constructComponentIntensionalSet(elementType, intensionalSet, ZERO, intensionalSetContext);
                    Rational elementMeasure = get(elementDomainIntensionalSet, intensionalSetContext);
                    elementMeasuresProduct = elementMeasuresProduct.multiply(elementMeasure);
                }
                evaluatedResult = Expressions.makeSymbol(elementMeasuresProduct);
            } else {
                Expression countingFormula = new DefaultCountingFormula(indexExpressionsSet, intensionalSet.getCondition());
                evaluatedResult = context.getTheory().evaluate(countingFormula, context);
            }
            if (Expressions.isNumber(evaluatedResult)) {
                result = evaluatedResult.rationalValue();
            } else {
                throw new UnsupportedOperationException("Unable to compute a finite measure for: " + intensionalSet + ", got : " + evaluatedResult);
            }
        } else {
            throw new UnsupportedOperationException("Currently only support the measure of single indexed intensional sets: " + intensionalSet);
        }
    } else {
        throw new IllegalArgumentException("Not an intensional set: " + intensionalSetExpression);
    }
    return result;
}