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Posted to dev@hama.apache.org by "Tommaso Teofili (JIRA)" <ji...@apache.org> on 2013/10/09 16:12:41 UTC

[jira] [Created] (HAMA-809) Underflow in LogisticRegressionModel

Tommaso Teofili created HAMA-809:
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             Summary: 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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