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https://issues.apache.org/jira/browse/SPARK-13646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177594#comment-15177594
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Apache Spark commented on SPARK-13646:
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User 'eliasah' has created a pull request for this issue:
https://github.com/apache/spark/pull/11491
> QuantileDiscretizer counts dataset twice in getSampledInput
> -----------------------------------------------------------
>
> Key: SPARK-13646
> URL: https://issues.apache.org/jira/browse/SPARK-13646
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 1.6.0
> Reporter: Abou Haydar Elias
> Priority: Trivial
> Labels: patch, performance
>
> getSampledInput counts the dataset twice as you see here :
> [https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/feature/QuantileDiscretizer.scala#L116]
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