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https://issues.apache.org/jira/browse/SPARK-17692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15606178#comment-15606178
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Joseph K. Bradley commented on SPARK-17692:
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[SPARK-17870] changes the output of ChiSqSelector. It is a bug fix, so it is
an acceptable change of behavior.
> Document ML/MLlib behavior changes in Spark 2.1
> -----------------------------------------------
>
> Key: SPARK-17692
> URL: https://issues.apache.org/jira/browse/SPARK-17692
> Project: Spark
> Issue Type: Documentation
> Components: ML, MLlib
> Reporter: Yanbo Liang
> Assignee: Yanbo Liang
> Labels: 2.1.0
>
> This JIRA records behavior changes of ML/MLlib between 2.0 and 2.1, so we can
> note those changes (if any) in the user guide's Migration Guide section. If
> you found one, please comment below and link the corresponding JIRA here.
> * SPARK-17389: Reduce KMeans default k-means|| init steps to 2 from 5.
> * SPARK-17870: ChiSquareSelector use pValue rather than raw statistic for
> SelectKBest features.
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