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From "Tommaso Teofili (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-809) Underflow in LogisticRegressionModel
Date Thu, 10 Oct 2013 06:12:41 GMT

    [ https://issues.apache.org/jira/browse/HAMA-809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13791229#comment-13791229
] 

Tommaso Teofili commented on HAMA-809:
--------------------------------------

no problem, current patch already solves much of the problems (apart from fixing log)

> Underflow in LogisticRegressionModel
> ------------------------------------
>
>                 Key: HAMA-809
>                 URL: https://issues.apache.org/jira/browse/HAMA-809
>             Project: Hama
>          Issue Type: Bug
>          Components: machine learning
>            Reporter: Tommaso Teofili
>            Assignee: Tommaso Teofili
>
> There's an underflow bug in _LogisticRegressionModel_ when calculating the hypothesis
output due to _double_ limitations.
> Therefore we should leverage _BigDecimal_s 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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