[jira] [Commented] (SPARK-16499) Improve applyInPlace function for matrix in ANN code

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-16499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15372969#comment-15372969 ] 

Apache Spark commented on SPARK-16499:
--------------------------------------

User 'WeichenXu123' has created a pull request for this issue:
https://github.com/apache/spark/pull/14156

> Improve applyInPlace function for matrix in ANN code
> ----------------------------------------------------
>
>                 Key: SPARK-16499
>                 URL: https://issues.apache.org/jira/browse/SPARK-16499
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML, MLlib
>            Reporter: Weichen Xu
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> The ApplyInPlace function in ANN code:
> `
> def apply(x: BDM[Double], y: BDM[Double], func: Double => Double): Unit
> `
> is implemented using simple while loop.
> It should be replaced with breeze BDM matrix operating function, so that it
> can take advantage of breeze lib's optimization.



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