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From "Tommaso Teofili (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HAMA-809) Underflow in LogisticRegressionModel
Date Thu, 28 Nov 2013 06:29:36 GMT

     [ https://issues.apache.org/jira/browse/HAMA-809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tommaso Teofili resolved HAMA-809.
----------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 0.7.0)
                   0.6.3

> Underflow in LogisticRegressionModel
> ------------------------------------
>
>                 Key: HAMA-809
>                 URL: https://issues.apache.org/jira/browse/HAMA-809
>             Project: Hama
>          Issue Type: Bug
>          Components: machine learning
>    Affects Versions: 0.6.1, 0.6.2
>            Reporter: Tommaso Teofili
>            Assignee: Tommaso Teofili
>             Fix For: 0.6.3
>
>
> There's an underflow bug in _LogisticRegressionModel_ when calculating the hypothesis
output due to _double_ limitations.
> Therefore we should leverage _BigDecimals_ for such operations as they allow for more
precise calculation.
> Also the log algorithm in LRM is wrong and needs to be fixed.



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