[jira] [Resolved] (SPARK-24024) Fix deviance calculations in GLM to handle corner cases

["DB Tsai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-24024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

DB Tsai resolved SPARK-24024.
-----------------------------
       Resolution: Fixed
    Fix Version/s: 2.4.0

> Fix deviance calculations in GLM to handle corner cases
> -------------------------------------------------------
>
>                 Key: SPARK-24024
>                 URL: https://issues.apache.org/jira/browse/SPARK-24024
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 2.3.0
>            Reporter: Teng Peng
>            Assignee: Teng Peng
>            Priority: Minor
>             Fix For: 2.4.0
>
>
> It is reported by Spark users that the deviance calculations does not handle a corner case. Thus, the correct model summary cannot be obtained. The user has confirmed the the issue is in
> override def deviance(y: Double, mu: Double, weight: Double): Double = {
>  2.0 * weight * (y * math.log(y / mu) - (y - mu))
>  }
> when y = 0.
>  
> The user also mentioned there are many other places he believe we should check the same thing.



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