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https://issues.apache.org/jira/browse/SPARK-4355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14261611#comment-14261611
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Apache Spark commented on SPARK-4355:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/3850
> OnlineSummarizer doesn't merge mean correctly
> ---------------------------------------------
>
> Key: SPARK-4355
> URL: https://issues.apache.org/jira/browse/SPARK-4355
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 1.0.2, 1.1.1, 1.2.0
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
> Labels: backport-needed
> Fix For: 1.1.1, 1.2.0
>
>
> It happens when the mean on one side is zero. I will send an PR with some
> code clean-up.
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