[jira] [Resolved] (SPARK-20790) ALS with implicit feedback ignores negative values

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-20790.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 2.2.0

Issue resolved by pull request 18022
[https://github.com/apache/spark/pull/18022]

> ALS with implicit feedback ignores negative values
> --------------------------------------------------
>
>                 Key: SPARK-20790
>                 URL: https://issues.apache.org/jira/browse/SPARK-20790
>             Project: Spark
>          Issue Type: Bug
>          Components: ML, MLlib
>    Affects Versions: 1.3.1, 1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 2.0.0, 2.0.1, 2.0.2, 2.1.0, 2.1.1
>            Reporter: David Eis
>             Fix For: 2.2.0
>
>
> The refactorization that was done in https://github.com/apache/spark/pull/5314/files introduced a bug, whereby for implicit feedback negative ratings just get ignored. Prior to that commit they were not ignored, but the absolute value was used as the confidence and the  preference was set to 0. The preservation of comments and absolute value indicate that this was unintentional.



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