[DL-Learner SVN] SF.net SVN: dl-learner:[4049] trunk/components-core/src/main/java/org/ dllearner/algorithms/isle/metrics/PMIRelevanceMetric.java

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

Revision: 4049
          http://sourceforge.net/p/dl-learner/code/4049
Author:   andremelo
Date:     2013-09-04 09:41:35 +0000 (Wed, 04 Sep 2013)
Log Message:
-----------
Correcting normalization expression

Modified Paths:
--------------
    trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/PMIRelevanceMetric.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 09:38:06 UTC (rev 4048)
+++ trunk/components-core/src/main/java/org/dllearner/algorithms/isle/metrics/PMIRelevanceMetric.java	2013-09-04 09:41:35 UTC (rev 4049)
@@ -46,7 +46,8 @@
 		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;
+		double pAB = (double) documentsAB.size() / (double) nrOfDocuments;
+		double normalizedPMI = (pmi/-Math.log(pAB) + 1)/2;
 		
 		return normalizedPMI;
 	}

This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.