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From "Yexi Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-809) Underflow in LogisticRegressionModel
Date Wed, 09 Oct 2013 15:14:42 GMT

    [ https://issues.apache.org/jira/browse/HAMA-809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790446#comment-13790446
] 

Yexi Jiang commented on HAMA-809:
---------------------------------

[~teofili] What is the testing data?

> 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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