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https://issues.apache.org/jira/browse/SPARK-12230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15056360#comment-15056360
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Apache Spark commented on SPARK-12230:
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User 'iyounus' has created a pull request for this issue:
https://github.com/apache/spark/pull/10274
> WeightedLeastSquares.fit() should handle division by zero properly if
> standard deviation of target variable is zero.
> --------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-12230
> URL: https://issues.apache.org/jira/browse/SPARK-12230
> Project: Spark
> Issue Type: Bug
> Components: ML
> Reporter: Imran Younus
> Priority: Trivial
>
> This is a TODO in WeightedLeastSquares.fit() method. If the standard
> deviation of the target variablel is zero, then the regression is
> meaningless. I think the fit() method should inform the user and exit nicely.
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