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

["David Eis (JIRA)" <ji...@apache.org>]

David Eis created SPARK-20790:
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             Summary: 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: 2.1.1, 2.1.0, 2.0.2, 2.0.1, 2.0.0, 1.6.3, 1.6.2, 1.6.1, 1.6.0, 1.5.2, 1.5.1, 1.5.0, 1.4.1, 1.4.0, 1.3.1
            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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