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Posted to dev@mahout.apache.org by "Trevor Grant (JIRA)" <ji...@apache.org> on 2017/02/04 05:33:52 UTC

[jira] [Assigned] (MAHOUT-1935) Inefficient use of XtX calculation in Ordinary Least Squares

     [ https://issues.apache.org/jira/browse/MAHOUT-1935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Trevor Grant reassigned MAHOUT-1935:
------------------------------------

    Assignee: Trevor Grant

> Inefficient use of XtX calculation in Ordinary Least Squares
> ------------------------------------------------------------
>
>                 Key: MAHOUT-1935
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1935
>             Project: Mahout
>          Issue Type: Improvement
>    Affects Versions: 0.13.0
>            Reporter: Trevor Grant
>            Assignee: Trevor Grant
>            Priority: Minor
>              Labels: beginner
>             Fix For: 0.13.0
>
>
> In line 59 of OrdinaryLeastSquaresModel we calculate and collect XtX, but then don't bother to use it (so it is in essence calculated twice).
> ~https://github.com/apache/zeppelin/blob/master/spark/src/main/java/org/apache/zeppelin/spark/SparkInterpreter.java~
> Not sure how that link got in there. It is unrelated.



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