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https://issues.apache.org/jira/browse/SPARK-4596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14224160#comment-14224160
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Apache Spark commented on SPARK-4596:
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User 'dbtsai' has created a pull request for this issue:
https://github.com/apache/spark/pull/3446
> Refactorize Normalizer to make code cleaner
> -------------------------------------------
>
> Key: SPARK-4596
> URL: https://issues.apache.org/jira/browse/SPARK-4596
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: DB Tsai
>
> In this refactoring, the performance is slightly increased by removing the
> overhead from breeze vector. The bottleneck is still in breeze norm which is
> implemented by activeIterator. This inefficiency of breeze norm will be
> addressed in next PR. At least, this PR makes the code more consistent in the
> codebase.
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