[DL-Learner SVN] SF.net SVN: dl-learner:[4048] trunk/components-core/src/main/java/org/ dllearner/algorithms/isle/metrics

[<and...@us...>]

Revision: 4048
          http://sourceforge.net/p/dl-learner/code/4048
Author:   andremelo
Date:     2013-09-04 09:38:06 +0000 (Wed, 04 Sep 2013)
Log Message:
-----------
Adding getNormalizedRelvance, which returns a value in [0,1]

Modified Paths:
--------------
    trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/PMIRelevanceMetric.java
    trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/RelevanceMetric.java

Modified: trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/PMIRelevanceMetric.java
===================================================================
--- trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/PMIRelevanceMetric.java	2013-09-04 09:18:50 UTC (rev 4047)
+++ trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/PMIRelevanceMetric.java	2013-09-04 09:38:06 UTC (rev 4048)
@@ -30,9 +30,25 @@
 		
 		double dPClass = nrOfDocuments == 0 ? 0 : ((double) documentsA.size() / (double) nrOfDocuments);
 		double dPClassEntity = documentsB.size() == 0 ? 0 : (double) documentsAB.size() / (double) documentsB.size();
-		double pmi = Math.log(dPClassEntity / dPClass);
+		double pmi = Math.log(dPClassEntity / dPClass);		
 		
 		return pmi;
 	}
+	
+	@Override
+	public double getNormalizedRelevance(Entity entityA, Entity entityB){
+		Set<AnnotatedDocument> documentsA = index.getDocuments(entityA);
+		Set<AnnotatedDocument> documentsB = index.getDocuments(entityB);
+		Set<AnnotatedDocument> documentsAB = Sets.intersection(documentsA, documentsB);
+		int nrOfDocuments = index.getSize();
+		
+		double dPClass = nrOfDocuments == 0 ? 0 : ((double) documentsA.size() / (double) nrOfDocuments);
+		double dPClassEntity = documentsB.size() == 0 ? 0 : (double) documentsAB.size() / (double) documentsB.size();
+		double pmi = Math.log(dPClassEntity / dPClass);		
+		
+		double normalizedPMI = (pmi/-Math.log(dPClassEntity) + 1)/2;
+		
+		return normalizedPMI;
+	}
 
 }

Modified: trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/RelevanceMetric.java
===================================================================
--- trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/RelevanceMetric.java	2013-09-04 09:18:50 UTC (rev 4047)
+++ trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/RelevanceMetric.java	2013-09-04 09:38:06 UTC (rev 4048)
@@ -30,4 +30,12 @@
 	 * @return
 	 */
 	double getRelevance(Entity entity1, Entity entity2);
+	
+	/**
+	 * Get  normalized relevance value in [0,1]	 * 
+	 * @param entity1
+	 * @param entity2
+	 * @return
+	 */
+	double getNormalizedRelevance(Entity entity1, Entity entity2);
 }
\ No newline at end of file

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