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https://issues.apache.org/jira/browse/SPARK-24024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16443892#comment-16443892
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Teng Peng commented on SPARK-24024:
-----------------------------------
I will first reproduce the issue he has, check how does R handle this, and if
we have any other fix needed.
> 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
> Priority: Minor
>
> 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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