svn commit: r995174 - /mahout/trunk/core/src/main/java/org/apache/mahout/classifier/sgd/CrossFoldLearner.java

[td...@apache.org]

Author: tdunning
Date: Wed Sep  8 18:02:25 2010
New Revision: 995174

URL: http://svn.apache.org/viewvc?rev=995174&view=rev
Log:
Make log-likelihood behavior better in the corners.

Modified:
    mahout/trunk/core/src/main/java/org/apache/mahout/classifier/sgd/CrossFoldLearner.java

Modified: mahout/trunk/core/src/main/java/org/apache/mahout/classifier/sgd/CrossFoldLearner.java
URL: http://svn.apache.org/viewvc/mahout/trunk/core/src/main/java/org/apache/mahout/classifier/sgd/CrossFoldLearner.java?rev=995174&r1=995173&r2=995174&view=diff
==============================================================================
--- mahout/trunk/core/src/main/java/org/apache/mahout/classifier/sgd/CrossFoldLearner.java (original)
+++ mahout/trunk/core/src/main/java/org/apache/mahout/classifier/sgd/CrossFoldLearner.java Wed Sep  8 18:02:25 2010
@@ -19,7 +19,10 @@ import java.util.List;
  * record should be passed with each training example.
  */
 public class CrossFoldLearner extends AbstractVectorClassifier implements OnlineLearner {
-  private int record;
+  // minimum score to be used for computing log likelihood
+  private static final double MIN_SCORE = 1e-50;
+
+  private int record = 0;
   private OnlineAuc auc = new OnlineAuc();
   private double logLikelihood;
   private final List<OnlineLogisticRegression> models = Lists.newArrayList();