[DL-Learner SVN] SF.net SVN: dl-learner:[3432] trunk/components-core/src/main/java/org/ dllearner

[<lor...@us...>]

Revision: 3432
          http://dl-learner.svn.sourceforge.net/dl-learner/?rev=3432&view=rev
Author:   lorenz_b
Date:     2011-11-23 14:24:16 +0000 (Wed, 23 Nov 2011)
Log Message:
-----------
Added option to use the class popularity in the score.
Added method to get the number of instances for a given class.

Modified Paths:
--------------
    trunk/components-core/src/main/java/org/dllearner/algorithms/DisjointClassesLearner.java
    trunk/components-core/src/main/java/org/dllearner/reasoning/SPARQLReasoner.java

Modified: trunk/components-core/src/main/java/org/dllearner/algorithms/DisjointClassesLearner.java
===================================================================
--- trunk/components-core/src/main/java/org/dllearner/algorithms/DisjointClassesLearner.java	2011-11-23 13:16:44 UTC (rev 3431)
+++ trunk/components-core/src/main/java/org/dllearner/algorithms/DisjointClassesLearner.java	2011-11-23 14:24:16 UTC (rev 3432)
@@ -75,6 +75,7 @@
 	
 	private boolean useWordNetDistance = false;
 	private boolean suggestMostGeneralClasses = true;
+	private boolean useClassPopularity = true;
 	
 	public DisjointClassesLearner(SparqlEndpointKS ks){
 		this.ks = ks;
@@ -239,7 +240,14 @@
 			SortedSet<Description> mostGeneralClasses = reasoner.getClassHierarchy().getMostGeneralClasses();
 		}
 		for(NamedClass cls : completeDisjointclasses){
-			evalDesc = new EvaluatedDescription(cls, new AxiomScore(1));
+			if(useClassPopularity){
+				double[] confidenceInterval = Heuristics.getConfidenceInterval95Wald(reasoner.getIndividualsCount(cls), 0);
+				double accuracy = (confidenceInterval[0] + confidenceInterval[1]) / 2;
+				evalDesc = new EvaluatedDescription(cls, new AxiomScore(1- accuracy));
+			} else {
+				evalDesc = new EvaluatedDescription(cls, new AxiomScore(1));
+			}
+			
 			evalDescs.add(evalDesc);
 		}
 		
@@ -268,7 +276,7 @@
 	public static void main(String[] args) throws Exception{
 		DisjointClassesLearner l = new DisjointClassesLearner(new SparqlEndpointKS(new SparqlEndpoint(new URL("http://dbpedia.aksw.org:8902/sparql"),
 				Collections.singletonList("http://dbpedia.org"), Collections.<String>emptyList())));
-		l.setClassToDescribe(new NamedClass("http://dbpedia.org/ontology/AdministrativeRegion"));
+		l.setClassToDescribe(new NamedClass("http://dbpedia.org/ontology/SoccerClub"));
 		l.init();
 		l.getReasoner().prepareSubsumptionHierarchy();
 //		System.out.println(l.getReasoner().getClassHierarchy().getSubClasses(new NamedClass("http://dbpedia.org/ontology/Athlete"), false));System.exit(0);

Modified: trunk/components-core/src/main/java/org/dllearner/reasoning/SPARQLReasoner.java
===================================================================
--- trunk/components-core/src/main/java/org/dllearner/reasoning/SPARQLReasoner.java	2011-11-23 13:16:44 UTC (rev 3431)
+++ trunk/components-core/src/main/java/org/dllearner/reasoning/SPARQLReasoner.java	2011-11-23 14:24:16 UTC (rev 3432)
@@ -568,6 +568,17 @@
 		} 
 		return null;
 	}
+	
+	public int getIndividualsCount(NamedClass nc){
+		String query = String.format("SELECT COUNT(?s) WHERE {" +
+				"?s a ?type." +
+				"}", 
+				nc.getURI());
+		ResultSet rs = executeSelectQuery(query);
+		int cnt = rs.next().get(rs.getResultVars().get(0)).asLiteral().getInt();
+		return cnt;
+		
+	}
 
 	@Override
 	public DataRange getRange(DatatypeProperty datatypeProperty) {

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