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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