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From "Tommaso Teofili (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAMA-668) Fix possible number instabilities in LogisticRegression CF
Date Fri, 09 Nov 2012 10:28:12 GMT
Tommaso Teofili created HAMA-668:
------------------------------------

             Summary: 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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