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https://issues.apache.org/jira/browse/SPARK-9224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14635496#comment-14635496
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Apache Spark commented on SPARK-9224:
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User 'feynmanliang' has created a pull request for this issue:
https://github.com/apache/spark/pull/7454
> OnlineLDAOptimizer Performance Improvements
> -------------------------------------------
>
> Key: SPARK-9224
> URL: https://issues.apache.org/jira/browse/SPARK-9224
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Reporter: Feynman Liang
> Priority: Critical
>
> OnlineLDAOptimizer's current implementation can be improved by using in-place
> updating (instead of reassignment to vars), reducing number of
> transpositions, and an outer product (instead of looping) to collect stats.
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