Add log for average AUC

src/main/java/be/cylab/java/wowa/training/Example.java

@@ -78,11 +78,14 @@ public final class Example {
                 data_file,
                 expected_file,
                 10,
-                10);
+                2);
 
+        double average_auc = 0;
         for (Map.Entry val : solutions.entrySet()) {
             System.out.println(val);
+            average_auc = average_auc + (double) val.getValue();
         }
+        logger.log(Level.INFO, "Average AUC : " + average_auc / 10);
 
     }