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https://issues.apache.org/jira/browse/SPARK-20790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16014704#comment-16014704
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Sean Owen commented on SPARK-20790:
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This needs more detail. Where is the logic problem, what's a reproduction, etc?
> 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
>
> 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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