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https://issues.apache.org/jira/browse/HAMA-809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790376#comment-13790376
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Tommaso Teofili commented on HAMA-809:
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here's a draft patch
https://github.com/tteofili/hama/compare/apache:trunk...hama-809.patch
> 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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