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https://issues.apache.org/jira/browse/SPARK-4717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14232783#comment-14232783
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Apache Spark commented on SPARK-4717:
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User 'dbtsai' has created a pull request for this issue:
https://github.com/apache/spark/pull/3577
> Optimize BLAS library to avoid de-reference multiple times in loop
> ------------------------------------------------------------------
>
> Key: SPARK-4717
> URL: https://issues.apache.org/jira/browse/SPARK-4717
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: DB Tsai
>
> Have a local reference to `values` and `indices` array in the `Vector` object
> so JVM can locate the value with one operation call. See `SPARK-4581` for
> similar optimization, and the bytecode analysis.
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