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Date: Tue, 13 Nov 2012 17:30:12 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: dev@hama.apache.org
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Subject: [jira] [Commented] (HAMA-668) Fix possible number instabilities in
 LogisticRegression CF
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    [ https://issues.apache.org/jira/browse/HAMA-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496355#comment-13496355 ] 

Hudson commented on HAMA-668:
-----------------------------

Integrated in Hama trunk #51 (See [https://builds.apache.org/job/Hama%20trunk/51/])
    [HAMA-668] - added an assertion to check h to be within 0 and 1 (Revision 1408773)

     Result = FAILURE
tommaso : 
Files : 
* /hama/trunk/ml/src/main/java/org/apache/hama/ml/regression/LogisticRegressionModel.java

                
> Fix possible number instabilities in LogisticRegression CF
> ----------------------------------------------------------
>
>                 Key: HAMA-668
>                 URL: https://issues.apache.org/jira/browse/HAMA-668
>             Project: Hama
>          Issue Type: Bug
>          Components: machine learning
>            Reporter: Tommaso Teofili
>
> In calculateCostForItem the log of several calculations may run in the special cases of the logarithm:
> * If the argument is NaN or less than zero, then the result is NaN.
> * If the argument is positive infinity, then the result is positive infinity.
> * If the argument is positive zero or negative zero, then the result is negative infinity.
> We should guard them.

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