protected void testEqualityNoAxiomsKBabcAEqualsCSucceeds(InferenceProcedure infp, bool expectedToFail)
{
FOLKnowledgeBase akb = FOLKnowledgeBaseFactory.createABCEqualityKnowledgeBase(infp, false);
TermEquality query = new TermEquality(new Constant("A"), new Constant("C"));
InferenceResult answer = akb.ask(query);
Assert.IsTrue(null != answer);
if (expectedToFail)
{
Assert.IsTrue(answer.isPossiblyFalse());
Assert.IsFalse(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(0 == answer.getProofs().Size());
}
else
{
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(1 == answer.getProofs().Size());
Assert.IsTrue(0 == answer.getProofs().Get(0)
.getAnswerBindings().Size());
}
}
protected void testEqualityAndSubstitutionNoAxiomsKBabcdPDSucceeds(InferenceProcedure infp, bool expectedToFail)
{
FOLKnowledgeBase akb = FOLKnowledgeBaseFactory.createABCDEqualityAndSubstitutionKnowledgeBase(infp, false);
ICollection <Term> terms = CollectionFactory.CreateQueue <Term>();
terms.Add(new Constant("D"));
Predicate query = new Predicate("P", terms);
InferenceResult answer = akb.ask(query);
Assert.IsTrue(null != answer);
if (expectedToFail)
{
Assert.IsTrue(answer.isPossiblyFalse());
Assert.IsFalse(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(0 == answer.getProofs().Size());
}
else
{
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(1 == answer.getProofs().Size());
Assert.IsTrue(0 == answer.getProofs().Get(0)
.getAnswerBindings().Size());
}
}
protected void testFullFOLKBLovesAnimalQueryKillsJackTunaFalse(InferenceProcedure infp, bool expectedToTimeOut)
{
FOLKnowledgeBase akb = FOLKnowledgeBaseFactory.createLovesAnimalKnowledgeBase(infp);
ICollection <Term> terms = CollectionFactory.CreateQueue <Term>();
terms.Add(new Constant("Jack"));
terms.Add(new Constant("Tuna"));
Predicate query = new Predicate("Kills", terms);
InferenceResult answer = akb.ask(query);
Assert.IsTrue(null != answer);
if (expectedToTimeOut)
{
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsFalse(answer.isTrue());
Assert.IsTrue(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(0 == answer.getProofs().Size());
}
else
{
Assert.IsTrue(answer.isPossiblyFalse());
Assert.IsFalse(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(0 == answer.getProofs().Size());
}
}
protected void testFullFOLKBLovesAnimalQueryNotKillsJackTunaSucceeds(
InferenceProcedure infp, bool expectedToTimeOut)
{
FOLKnowledgeBase akb = FOLKnowledgeBaseFactory
.createLovesAnimalKnowledgeBase(infp);
List <Term> terms = new List <Term>();
terms.Add(new Constant("Jack"));
terms.Add(new Constant("Tuna"));
NotSentence query = new NotSentence(new Predicate("Kills", terms));
InferenceResult answer = akb.ask(query);
Assert.IsTrue(null != answer);
if (expectedToTimeOut)
{
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsFalse(answer.isTrue());
Assert.IsTrue(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(0 == answer.getProofs().Count);
}
else
{
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(1 == answer.getProofs().Count);
Assert.IsTrue(0 == answer.getProofs()[0]
.getAnswerBindings().Count);
}
}
/**
* Utility method for outputting InferenceResults in a formatted textual
* representation.
*
* @param ir
* an InferenceResult
* @return a String representation of the InferenceResult.
*/
public static String printInferenceResult(InferenceResult ir)
{
StringBuilder sb = new StringBuilder();
sb.Append("InferenceResult.isTrue=" + ir.isTrue());
sb.Append("\n");
sb.Append("InferenceResult.isPossiblyFalse=" + ir.isPossiblyFalse());
sb.Append("\n");
sb.Append("InferenceResult.isUnknownDueToTimeout="
+ ir.isUnknownDueToTimeout());
sb.Append("\n");
sb.Append("InferenceResult.isPartialResultDueToTimeout="
+ ir.isPartialResultDueToTimeout());
sb.Append("\n");
sb.Append("InferenceResult.#Proofs=" + ir.getProofs().Count);
sb.Append("\n");
int proofNo = 0;
List <Proof> proofs = ir.getProofs();
foreach (Proof p in proofs)
{
proofNo++;
sb.Append("InferenceResult.Proof#" + proofNo + "=\n"
+ ProofPrinter.printProof(p));
}
return(sb.ToString());
}
/**
* Utility method for outputting InferenceResults in a formatted textual
* representation.
*
* @param ir
* an InferenceResult
* @return a String representation of the InferenceResult.
*/
public static String printInferenceResult(InferenceResult ir) {
StringBuilder sb = new StringBuilder();
sb.Append("InferenceResult.isTrue=" + ir.isTrue());
sb.Append("\n");
sb.Append("InferenceResult.isPossiblyFalse=" + ir.isPossiblyFalse());
sb.Append("\n");
sb.Append("InferenceResult.isUnknownDueToTimeout="
+ ir.isUnknownDueToTimeout());
sb.Append("\n");
sb.Append("InferenceResult.isPartialResultDueToTimeout="
+ ir.isPartialResultDueToTimeout());
sb.Append("\n");
sb.Append("InferenceResult.#Proofs=" + ir.getProofs().Count);
sb.Append("\n");
int proofNo = 0;
List<Proof.Proof> proofs = ir.getProofs();
foreach (Proof.Proof p in proofs) {
proofNo++;
sb.Append("InferenceResult.Proof#" + proofNo + "=\n"
+ ProofPrinter.printProof(p));
}
return sb.ToString();
}
public String predict(Example e)
{
String prediction = "~" + e.targetValue();
if (null != currentBestHypothesis)
{
FOLExample etp = new FOLExample(folDSDomain, e, 0);
kb.clear();
kb.tell(etp.getDescription());
kb.tell(currentBestHypothesis.getHypothesis());
InferenceResult ir = kb.ask(etp.getClassification());
if (ir.isTrue())
{
if (trueGoalValue.Equals(e.targetValue()))
{
prediction = e.targetValue();
}
}
else if (ir.isPossiblyFalse() || ir.isUnknownDueToTimeout())
{
if (!trueGoalValue.Equals(e.targetValue()))
{
prediction = e.targetValue();
}
}
}
return(prediction);
}
protected void testHornClauseKBRingOfThievesQuerySkisXReturnsNancyRedBertDrew(InferenceProcedure infp)
{
FOLKnowledgeBase rotkb = FOLKnowledgeBaseFactory.createRingOfThievesKnowledgeBase(infp);
ICollection <Term> terms = CollectionFactory.CreateQueue <Term>();
terms.Add(new Variable("x"));
Predicate query = new Predicate("Skis", terms);
InferenceResult answer = rotkb.ask(query);
Assert.IsTrue(null != answer);
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
// DB can expand infinitely so is only partial.
Assert.IsTrue(answer.isPartialResultDueToTimeout());
Assert.AreEqual(4, answer.getProofs().Size());
Assert.AreEqual(1, answer.getProofs().Get(0).getAnswerBindings().Size());
Assert.AreEqual(1, answer.getProofs().Get(1).getAnswerBindings().Size());
Assert.AreEqual(1, answer.getProofs().Get(2).getAnswerBindings().Size());
Assert.AreEqual(1, answer.getProofs().Get(3).getAnswerBindings().Size());
ICollection <Constant> expected = CollectionFactory.CreateQueue <Constant>();
expected.Add(new Constant("Nancy"));
expected.Add(new Constant("Red"));
expected.Add(new Constant("Bert"));
expected.Add(new Constant("Drew"));
foreach (Proof p in answer.getProofs())
{
expected.Remove(p.getAnswerBindings().Get(new Variable("x")) as Constant);
}
Assert.AreEqual(0, expected.Size());
}
protected void testEqualityAndSubstitutionAxiomsKBabcdFFASucceeds(
InferenceProcedure infp)
{
FOLKnowledgeBase akb = FOLKnowledgeBaseFactory
.createABCDEqualityAndSubstitutionKnowledgeBase(infp, true);
List <Term> terms = new List <Term>();
terms.Add(new Constant("A"));
Function fa = new Function("F", terms);
terms = new List <Term>();
terms.Add(fa);
TermEquality query = new TermEquality(new Function("F", terms),
new Constant("A"));
InferenceResult answer = akb.ask(query);
Assert.IsTrue(null != answer);
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(1 == answer.getProofs().Count);
Assert.IsTrue(0 == answer.getProofs()[0].getAnswerBindings()
.Count);
}
public void testExhaustsSearchSpace()
{
// Taken from AIMA pg 679
FOLDomain domain = new FOLDomain();
domain.addPredicate("alternate");
domain.addPredicate("bar");
domain.addPredicate("fri_sat");
domain.addPredicate("hungry");
domain.addPredicate("patrons");
domain.addPredicate("price");
domain.addPredicate("raining");
domain.addPredicate("reservation");
domain.addPredicate("type");
domain.addPredicate("wait_estimate");
domain.addPredicate("will_wait");
domain.addConstant("Some");
domain.addConstant("Full");
domain.addConstant("French");
domain.addConstant("Thai");
domain.addConstant("Burger");
domain.addConstant("$");
domain.addConstant("_30_60");
domain.addConstant("X0");
FOLParser parser = new FOLParser(domain);
// The hypothesis
String c1 = "patrons(v,Some)";
String c2 = "patrons(v,Full) AND (hungry(v) AND type(v,French))";
String c3 = "patrons(v,Full) AND (hungry(v) AND (type(v,Thai) AND fri_sat(v)))";
String c4 = "patrons(v,Full) AND (hungry(v) AND type(v,Burger))";
String sh = "FORALL v (will_wait(v) <=> (" + c1 + " OR (" + c2
+ " OR (" + c3 + " OR (" + c4 + ")))))";
Sentence hypothesis = parser.parse(sh);
Sentence desc = parser
.parse("(((((((((alternate(X0) AND NOT(bar(X0))) AND NOT(fri_sat(X0))) AND hungry(X0)) AND patrons(X0,Full)) AND price(X0,$)) AND NOT(raining(X0))) AND NOT(reservation(X0))) AND type(X0,Thai)) AND wait_estimate(X0,_30_60))");
Sentence classification = parser.parse("will_wait(X0)");
FOLKnowledgeBase kb = new FOLKnowledgeBase(domain,
new FOLOTTERLikeTheoremProver(false));
kb.tell(hypothesis);
kb.tell(desc);
InferenceResult ir = kb.ask(classification);
Assert.IsFalse(ir.isTrue());
Assert.IsTrue(ir.isPossiblyFalse());
Assert.IsFalse(ir.isUnknownDueToTimeout());
Assert.IsFalse(ir.isPartialResultDueToTimeout());
Assert.AreEqual(0, ir.getProofs().Count);
}
protected void testDefiniteClauseKBKingsQueryRichardEvilFalse(InferenceProcedure infp)
{
FOLKnowledgeBase kkb = FOLKnowledgeBaseFactory.createKingsKnowledgeBase(infp);
ICollection <Term> terms = CollectionFactory.CreateQueue <Term>();
terms.Add(new Constant("Richard"));
Predicate query = new Predicate("Evil", terms);
InferenceResult answer = kkb.ask(query);
Assert.IsTrue(null != answer);
Assert.IsTrue(answer.isPossiblyFalse());
Assert.IsFalse(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(0 == answer.getProofs().Size());
}
protected void testDefiniteClauseKBKingsQueryEvilXReturnsJohnSucceeds(InferenceProcedure infp)
{
FOLKnowledgeBase kkb = FOLKnowledgeBaseFactory.createKingsKnowledgeBase(infp);
ICollection <Term> terms = CollectionFactory.CreateQueue <Term>();
terms.Add(new Variable("x"));
Predicate query = new Predicate("Evil", terms);
InferenceResult answer = kkb.ask(query);
Assert.IsTrue(null != answer);
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(1 == answer.getProofs().Size());
Assert.IsTrue(1 == answer.getProofs().Get(0).getAnswerBindings().Size());
Assert.AreEqual(new Constant("John"), answer.getProofs().Get(0).getAnswerBindings().Get(new Variable("x")));
}
//
// Protected Methods
//
protected void testDefiniteClauseKBKingsQueryCriminalXFalse(
InferenceProcedure infp)
{
FOLKnowledgeBase kkb = FOLKnowledgeBaseFactory
.createKingsKnowledgeBase(infp);
List <Term> terms = new List <Term>();
terms.Add(new Variable("x"));
Predicate query = new Predicate("Criminal", terms);
InferenceResult answer = kkb.ask(query);
Assert.IsTrue(null != answer);
Assert.IsTrue(answer.isPossiblyFalse());
Assert.IsFalse(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(0 == answer.getProofs().Count);
}
protected void testDefiniteClauseKBKingsQueryKingXReturnsJohnAndRichardSucceeds(
InferenceProcedure infp)
{
FOLKnowledgeBase kkb = FOLKnowledgeBaseFactory
.createKingsKnowledgeBase(infp);
List <Term> terms = new List <Term>();
terms.Add(new Variable("x"));
Predicate query = new Predicate("King", terms);
InferenceResult answer = kkb.ask(query);
Assert.IsTrue(null != answer);
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(2 == answer.getProofs().Count);
Assert.IsTrue(1 == answer.getProofs()[0].getAnswerBindings()
.Count);
Assert.IsTrue(1 == answer.getProofs()[1].getAnswerBindings()
.Count);
bool gotJohn, gotRichard;
gotJohn = gotRichard = false;
Constant cJohn = new Constant("John");
Constant cRichard = new Constant("Richard");
foreach (Proof p in answer.getProofs())
{
Dictionary <Variable, Term> ans = p.getAnswerBindings();
Assert.AreEqual(1, ans.Count);
if (cJohn.Equals(ans[new Variable("x")]))
{
gotJohn = true;
}
if (cRichard.Equals(ans[new Variable("x")]))
{
gotRichard = true;
}
}
Assert.IsTrue(gotJohn);
Assert.IsTrue(gotRichard);
}
protected void testDefiniteClauseKBKingsQueryJohnEvilSucceeds(
InferenceProcedure infp)
{
FOLKnowledgeBase kkb = FOLKnowledgeBaseFactory
.createKingsKnowledgeBase(infp);
List <Term> terms = new List <Term>();
terms.Add(new Constant("John"));
Predicate query = new Predicate("Evil", terms);
InferenceResult answer = kkb.ask(query);
Assert.IsTrue(null != answer);
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(1 == answer.getProofs().Count);
Assert.IsTrue(0 == answer.getProofs()[0].getAnswerBindings()
.Count);
}
protected void testDefiniteClauseKBWeaponsQueryCriminalXReturnsWestSucceeds(
InferenceProcedure infp)
{
FOLKnowledgeBase wkb = FOLKnowledgeBaseFactory
.createWeaponsKnowledgeBase(infp);
List <Term> terms = new List <Term>();
terms.Add(new Variable("x"));
Predicate query = new Predicate("Criminal", terms);
InferenceResult answer = wkb.ask(query);
Assert.IsTrue(null != answer);
Assert.IsFalse(answer.isPossiblyFalse());
Assert.IsTrue(answer.isTrue());
Assert.IsFalse(answer.isUnknownDueToTimeout());
Assert.IsFalse(answer.isPartialResultDueToTimeout());
Assert.IsTrue(1 == answer.getProofs().Count);
Assert.IsTrue(1 == answer.getProofs()[0].getAnswerBindings()
.Count);
Assert.AreEqual(new Constant("West"), answer.getProofs()[0]
.getAnswerBindings()[new Variable("x")]);
}
/**
* Utility method for outputting InferenceResults in a formatted textual
* representation.
*
* @param ir
* an InferenceResult
* @return a string representation of the InferenceResult.
*/
public static string printInferenceResult(InferenceResult ir)
{
IStringBuilder sb = TextFactory.CreateStringBuilder();
sb.Append("InferenceResult.isTrue=" + ir.isTrue());
sb.Append("\n");
sb.Append("InferenceResult.isPossiblyFalse=" + ir.isPossiblyFalse());
sb.Append("\n");
sb.Append("InferenceResult.isUnknownDueToTimeout=" + ir.isUnknownDueToTimeout());
sb.Append("\n");
sb.Append("InferenceResult.isPartialResultDueToTimeout=" + ir.isPartialResultDueToTimeout());
sb.Append("\n");
sb.Append("InferenceResult.#Proofs=" + ir.getProofs().Size());
sb.Append("\n");
int proofNo = 0;
foreach (Proof p in ir.getProofs())
{
proofNo++;
sb.Append("InferenceResult.Proof#" + proofNo + "=\n" + ProofPrinter.printProof(p));
}
return(sb.ToString());
}