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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-20790) ALS with implicit feedback ignores negative values
Date Wed, 31 May 2017 12:54:04 GMT

     [ 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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