[jira] [Resolved] (SPARK-20423) fix MLOR coeffs centering when reg == 0

["DB Tsai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

DB Tsai resolved SPARK-20423.
-----------------------------
       Resolution: Fixed
    Fix Version/s: 2.2.0
                   3.0.0

Issue resolved by pull request 17706
[https://github.com/apache/spark/pull/17706]

> fix MLOR coeffs centering when reg == 0
> ---------------------------------------
>
>                 Key: SPARK-20423
>                 URL: https://issues.apache.org/jira/browse/SPARK-20423
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 2.0.0, 2.1.0
>            Reporter: Weichen Xu
>            Priority: Minor
>             Fix For: 3.0.0, 2.2.0
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> When reg == 0, MLOR has multiple solutions and we need to centralize the coeffs to get identical result.
> BUT current implementation centralize the coefficientMatrix by the global coeffs means.
> In fact the coefficientMatrix should be centralized on each feature index itself.



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