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/*
* This file is part of the OWL API.
*
* The contents of this file are subject to the LGPL License, Version 3.0.
*
* Copyright (C) 2011, Clark & Parsia, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
*
* Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
* in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
*
* Copyright 2011, Clark & Parsia, LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.clarkparsia.owlapi.explanation;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.semanticweb.owlapi.model.AddAxiom;
import org.semanticweb.owlapi.model.OWLAnnotationAxiom;
import org.semanticweb.owlapi.model.OWLAxiom;
import org.semanticweb.owlapi.model.OWLAxiomVisitor;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLDataProperty;
import org.semanticweb.owlapi.model.OWLDeclarationAxiom;
import org.semanticweb.owlapi.model.OWLEntity;
import org.semanticweb.owlapi.model.OWLException;
import org.semanticweb.owlapi.model.OWLIndividual;
import org.semanticweb.owlapi.model.OWLObjectProperty;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyChange;
import org.semanticweb.owlapi.model.OWLOntologyManager;
import org.semanticweb.owlapi.model.OWLRuntimeException;
import org.semanticweb.owlapi.model.OWLSubClassOfAxiom;
import org.semanticweb.owlapi.reasoner.OWLReasoner;
import org.semanticweb.owlapi.reasoner.OWLReasonerFactory;
import org.semanticweb.owlapi.util.OWLAxiomVisitorAdapter;
import com.clarkparsia.owlapi.explanation.util.OntologyUtils;
/**
* A black box explanation
*
*/
public class BlackBoxExplanation extends SingleExplanationGeneratorImpl implements SingleExplanationGenerator {
private static final Logger log = Logger.getLogger(BlackBoxExplanation.class.getName());
private OWLOntology debuggingOntology;
protected final Set debuggingAxioms;
private final Set objectsExpandedWithDefiningAxioms;
private final Set objectsExpandedWithReferencingAxioms;
private final Set expandedWithDefiningAxioms;
private final Set expandedWithReferencingAxioms;
private final Map expandedAxiomMap;
/**
* default expansion limit
*/
public static final int DEFAULT_INITIAL_EXPANSION_LIMIT = 50;
private int initialExpansionLimit = DEFAULT_INITIAL_EXPANSION_LIMIT;
private int expansionLimit = initialExpansionLimit;
private double expansionFactor = 1.25;
private static final int DEFAULT_FAST_PRUNING_WINDOW_SIZE = 10;
private int fastPruningWindowSize = 0;
private boolean performRepeatedFastPruning = false;
private final OWLOntologyManager owlOntologyManager;
/**
* @param ontology the ontology
* @param reasonerFactory the reasoner factory
* @param reasoner the reasoner
*/
public BlackBoxExplanation(OWLOntology ontology, OWLReasonerFactory reasonerFactory, OWLReasoner reasoner) {
super(ontology, reasonerFactory, reasoner);
owlOntologyManager = ontology.getOWLOntologyManager();
debuggingAxioms = new LinkedHashSet();
objectsExpandedWithDefiningAxioms = new HashSet();
objectsExpandedWithReferencingAxioms = new HashSet();
expandedWithDefiningAxioms = new HashSet();
expandedWithReferencingAxioms = new HashSet();
expandedAxiomMap = new HashMap();
}
// XXX once the interface changes, uncomment this
//@Override
@SuppressWarnings("javadoc")
public void dispose() {
reset();
getReasoner().dispose();
}
private void reset() {
if (debuggingOntology != null) {
owlOntologyManager.removeOntology(debuggingOntology);
debuggingOntology = null;
}
debuggingAxioms.clear();
objectsExpandedWithDefiningAxioms.clear();
objectsExpandedWithReferencingAxioms.clear();
expandedWithDefiningAxioms.clear();
expandedWithReferencingAxioms.clear();
expandedAxiomMap.clear();
expansionLimit = initialExpansionLimit;
}
@Override
public Set getExplanation(OWLClassExpression unsatClass) {
if (!getDefinitionTracker().isDefined(unsatClass)) {
return Collections.emptySet();
}
try {
satTestCount++;
if (isFirstExplanation()) {
if (getReasoner().isSatisfiable(unsatClass)) {
return Collections.emptySet();
}
}
reset();
expandUntilUnsatisfiable(unsatClass);
pruneUntilMinimal(unsatClass);
removeDeclarations();
return new HashSet(debuggingAxioms);
}
catch (OWLException e) {
throw new OWLRuntimeException(e);
}
}
// /////////////////////////////////////////////////////////////////////////////////////////
//
// Expansion
//
// /////////////////////////////////////////////////////////////////////////////////////////
private int expandAxioms() {
/*
* We expand the axiom set using axioms that define entities that are
* already referenced in the existing set of axioms. If this fails to
* expand the axiom set we expand using axioms that reference the
* entities in the axioms that have already been expanded.
*/
// Keep track of the number of axioms that have been added
int axiomsAdded = 0;
int remainingSpace = expansionLimit;
for (OWLAxiom ax : new ArrayList(debuggingAxioms)) {
if (expandedWithDefiningAxioms.contains(ax)) {
// Skip if already done
continue;
}
// Collect the entities that have been used in the axiom
for (OWLEntity curObj : ax.getSignature()) {
if (!objectsExpandedWithDefiningAxioms.contains(curObj)) {
int added = expandWithDefiningAxioms(curObj, remainingSpace);
axiomsAdded += added;
remainingSpace = remainingSpace - added;
if (remainingSpace == 0) {
expansionLimit *= expansionFactor;
return axiomsAdded;
}
// Flag that we have completely expanded all defining axioms
// for this particular entity
objectsExpandedWithDefiningAxioms.add(curObj);
}
}
// Flag that we've completely expanded this particular axiom
expandedWithDefiningAxioms.add(ax);
}
if (axiomsAdded > 0) {
return axiomsAdded;
}
// No axioms added at this point. Start adding axioms that reference
// entities contained in the current set of debugging axioms
for (OWLAxiom ax : new ArrayList(debuggingAxioms)) {
if (expandedWithReferencingAxioms.contains(ax)) {
// Skip - already done this one
continue;
}
// Keep track of the number of axioms that have been added
for (OWLEntity curObj : ax.getSignature()) {
if (!objectsExpandedWithReferencingAxioms.contains(curObj)) {
int added = expandWithReferencingAxioms(curObj, expansionLimit);
axiomsAdded += added;
remainingSpace -= added;
if (remainingSpace == 0) {
expansionLimit *= expansionFactor;
return axiomsAdded;
}
objectsExpandedWithReferencingAxioms.add(curObj);
}
}
expandedWithReferencingAxioms.add(ax);
}
return axiomsAdded;
}
/**
* Creates a set of axioms to expands the debugging axiom set by adding the
* defining axioms for the specified entity.
*/
private int expandWithDefiningAxioms(OWLEntity obj, int limit) {
Set expansionAxioms = new HashSet();
for (OWLOntology ont : getOntology().getImportsClosure()) {
boolean referenceFound = false;
if (obj instanceof OWLClass) {
referenceFound = expansionAxioms.addAll(ont.getAxioms((OWLClass) obj));
}
else if (obj instanceof OWLObjectProperty) {
referenceFound = expansionAxioms.addAll(ont.getAxioms((OWLObjectProperty) obj));
}
else if (obj instanceof OWLDataProperty) {
referenceFound = expansionAxioms.addAll(ont.getAxioms((OWLDataProperty) obj));
}
else if (obj instanceof OWLIndividual) {
referenceFound = expansionAxioms.addAll(ont.getAxioms((OWLIndividual) obj));
}
if (!referenceFound) {
expansionAxioms.add(owlOntologyManager.getOWLDataFactory().getOWLDeclarationAxiom(obj));
}
}
expansionAxioms.removeAll(debuggingAxioms);
return addMax(expansionAxioms, debuggingAxioms, limit);
}
/**
* Expands the axiom set by adding the referencing axioms for the specified
* entity.
*/
private int expandWithReferencingAxioms(OWLEntity obj, int limit) {
Set expansionAxioms = new HashSet();
// First expand by getting the defining axioms - if this doesn't
// return any axioms, then get the axioms that reference the entity
for (OWLOntology ont : getOntology().getImportsClosure()) {
expansionAxioms.addAll(ont.getReferencingAxioms(obj));
}
expansionAxioms.removeAll(debuggingAxioms);
return addMax(expansionAxioms, debuggingAxioms, limit);
}
/**
* A utility method. Adds axioms from one set to another set upto a
* specified limit. Annotation axioms are stripped out
*
* @param source The source set. Objects from this set will be added to the
* destination set
* @param dest The destination set. Objects will be added to this set
* @param limit The maximum number of objects to be added.
* @return The number of objects that were actually added.
*/
private static int addMax(Set source, Set dest, int limit) {
int count = 0;
for (N obj : source) {
if (count == limit) {
break;
}
if (!(obj instanceof OWLAnnotationAxiom)) {
if (dest.add(obj)) {
count++;
}
}
}
return count;
}
// /////////////////////////////////////////////////////////////////////////////////////////
//
// Contraction/Pruning - Fast pruning is performed and then slow pruning is
// performed.
//
// /////////////////////////////////////////////////////////////////////////////////////////
private void performFastPruning(OWLClassExpression unsatClass) throws OWLException {
Set axiomWindow = new HashSet();
Object[] axioms = debuggingAxioms.toArray();
if (log.isLoggable(Level.FINE)) {
log.info("Fast pruning: ");
}
if (log.isLoggable(Level.FINE)) {
log.fine(" - Window size: " + fastPruningWindowSize);
}
int windowCount = debuggingAxioms.size() / fastPruningWindowSize;
for (int currentWindow = 0; currentWindow < windowCount; currentWindow++) {
axiomWindow.clear();
int startIndex = currentWindow * fastPruningWindowSize;
int endIndex = startIndex + fastPruningWindowSize;
for (int axiomIndex = startIndex; axiomIndex < endIndex; axiomIndex++) {
OWLAxiom currentAxiom = (OWLAxiom) axioms[axiomIndex];
axiomWindow.add(currentAxiom);
debuggingAxioms.remove(currentAxiom);
}
if (isSatisfiable(unsatClass)) {
debuggingAxioms.addAll(axiomWindow);
}
}
// Add any left over axioms
axiomWindow.clear();
int remainingAxiomsCount = debuggingAxioms.size() % fastPruningWindowSize;
if (remainingAxiomsCount > 0) {
int fragmentIndex = windowCount * fastPruningWindowSize;
while (fragmentIndex < axioms.length) {
OWLAxiom curAxiom = (OWLAxiom) axioms[fragmentIndex];
axiomWindow.add(curAxiom);
debuggingAxioms.remove(curAxiom);
fragmentIndex++;
}
if (isSatisfiable(unsatClass)) {
debuggingAxioms.addAll(axiomWindow);
}
}
if (log.isLoggable(Level.FINE)) {
log.fine(" - End of fast pruning");
}
}
private void performSlowPruning(OWLClassExpression unsatClass) throws OWLException {
// Simply remove axioms one at a time. If the class
// being debugged turns satisfiable then we know we have
// an SOS axiom.
List axiomsCopy = new ArrayList(debuggingAxioms);
for (OWLAxiom ax : axiomsCopy) {
debuggingAxioms.remove(ax);
if (isSatisfiable(unsatClass)) {
// Affects satisfiability, so add back in
debuggingAxioms.add(ax);
}
}
}
// //////////////////////////////////////////////////////////////////////////////////////////
//
// Creation of debugging ontology and satisfiability testing
//
// /////////////////////////////////////////////////////////////////////////////////////////
private int satTestCount = 0;
/**
* Tests the satisfiability of the test class. The ontology is recreated
* before the test is performed.
*/
private boolean isSatisfiable(OWLClassExpression unsatClass) throws OWLException {
createDebuggingOntology();
OWLReasoner reasoner = getReasonerFactory().createNonBufferingReasoner(debuggingOntology);
if (OntologyUtils.containsUnreferencedEntity(debuggingOntology, unsatClass)) {
reasoner.dispose();
return true;
}
satTestCount++;
boolean sat = reasoner.isSatisfiable(unsatClass);
reasoner.dispose();
return sat;
}
private void createDebuggingOntology() throws OWLException {
if (debuggingOntology != null) {
owlOntologyManager.removeOntology(debuggingOntology);
}
debuggingOntology = owlOntologyManager.createOntology();
List changes = new ArrayList();
for (OWLAxiom ax : debuggingAxioms) {
changes.add(new AddAxiom(debuggingOntology, ax));
}
owlOntologyManager.applyChanges(changes);
}
private void resetSatisfiabilityTestCounter() {
satTestCount = 0;
}
private void expandUntilUnsatisfiable(OWLClassExpression unsatClass) throws OWLException {
// Perform the initial expansion - this will cause
// the debugging axioms set to be expanded to the
// defining axioms for the class being debugged
resetSatisfiabilityTestCounter();
if (!unsatClass.isAnonymous()) {
expandWithDefiningAxioms((OWLClass) unsatClass, expansionLimit);
}
else {
OWLClass owlThing = owlOntologyManager.getOWLDataFactory().getOWLThing();
OWLSubClassOfAxiom axiom = owlOntologyManager.getOWLDataFactory().getOWLSubClassOfAxiom(unsatClass, owlThing);
debuggingAxioms.add(axiom);
expandAxioms();
debuggingAxioms.remove(axiom);
}
if (log.isLoggable(Level.FINE)) {
log.fine("Initial axiom count: " + debuggingAxioms.size());
}
int totalAdded = 0;
int expansionCount = 0;
while (isSatisfiable(unsatClass)) {
if (log.isLoggable(Level.FINE)) {
log.fine("Expanding axioms (expansion " + expansionCount + ")");
}
expansionCount++;
int numberAdded = expandAxioms();
totalAdded += numberAdded;
if (log.isLoggable(Level.FINE)) {
log.fine(" ... expanded by " + numberAdded);
}
if (numberAdded == 0) {
if (log.isLoggable(Level.FINE)) {
log.fine("ERROR! Cannot find SOS axioms!");
}
debuggingAxioms.clear();
return;
}
}
if (log.isLoggable(Level.FINE)) {
log.fine("Total number of axioms added: " + totalAdded);
}
}
protected void pruneUntilMinimal(OWLClassExpression unsatClass) throws OWLException {
if (log.isLoggable(Level.FINE)) {
log.fine("FOUND CLASH! Pruning " + debuggingAxioms.size() + " axioms...");
}
resetSatisfiabilityTestCounter();
if (log.isLoggable(Level.FINE)) {
log.fine("Fast pruning...");
}
// fastPruningWindowSize = 0;
if (performRepeatedFastPruning) {
// Base the initial fast pruning window size on the number of axioms
fastPruningWindowSize = debuggingAxioms.size() / 6;
if (fastPruningWindowSize < DEFAULT_FAST_PRUNING_WINDOW_SIZE) {
fastPruningWindowSize = DEFAULT_FAST_PRUNING_WINDOW_SIZE;
}
if (log.isLoggable(Level.FINE)) {
log.fine(" Initial fast pruning window size: " + fastPruningWindowSize);
}
int fastPruningCounter = 0;
while (fastPruningWindowSize != 1) {
if (log.isLoggable(Level.FINE)) {
log.fine(" Round: " + fastPruningCounter + " (axioms to prune: " + debuggingAxioms.size() + ")");
}
fastPruningCounter++;
performFastPruning(unsatClass);
fastPruningWindowSize = fastPruningWindowSize / 3;
if (fastPruningWindowSize < 1) {
fastPruningWindowSize = 1;
}
}
if (log.isLoggable(Level.FINE)) {
log.fine("... end of fast pruning. Axioms remaining: " + debuggingAxioms.size());
log.fine("Performed " + satTestCount + " satisfiability tests during fast pruning");
}
}
else {
fastPruningWindowSize = DEFAULT_FAST_PRUNING_WINDOW_SIZE;
performFastPruning(unsatClass);
if (log.isLoggable(Level.FINE)) {
log.info("... end of fast pruning. Axioms remaining: " + debuggingAxioms.size());
log.info("Performed " + satTestCount + " satisfiability tests during fast pruning");
}
}
int totalSatTests = satTestCount;
resetSatisfiabilityTestCounter();
if (log.isLoggable(Level.FINE)) {
log.fine("Slow pruning...");
}
performSlowPruning(unsatClass);
if (log.isLoggable(Level.FINE)) {
log.fine("... end of slow pruning");
log.fine("Performed " + satTestCount + " satisfiability tests during slow pruning");
}
totalSatTests += satTestCount;
if (log.isLoggable(Level.FINE)) {
log.fine("Total number of satisfiability tests performed: " + totalSatTests);
}
}
private void removeDeclarations() {
OWLAxiomVisitor declarationRemover = new OWLAxiomVisitorAdapter() {
@Override
public void visit(OWLDeclarationAxiom axiom) {
debuggingAxioms.remove(axiom);
}
};
for (OWLAxiom axiom : debuggingAxioms.toArray(new OWLAxiom[debuggingAxioms.size()])) {
axiom.accept(declarationRemover);
}
}
@Override
public String toString() {
return "BlackBox";
}
}
