Tommaso Teofili created HAMA-668:
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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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