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https://issues.apache.org/jira/browse/SPARK-19787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Pentreath resolved SPARK-19787.
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Resolution: Fixed
Fix Version/s: 2.2.0
Issue resolved by pull request 17121
[https://github.com/apache/spark/pull/17121]
> Different default regParam values in ALS
> ----------------------------------------
>
> Key: SPARK-19787
> URL: https://issues.apache.org/jira/browse/SPARK-19787
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 2.0.0, 2.0.1, 2.0.2, 2.1.0
> Reporter: Vasilis Vryniotis
> Priority: Trivial
> Fix For: 2.2.0
>
>
> In the ALS method the default values of regParam do not match within the same
> file (lines
> [224|https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala#L224]
> and
> [714|https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala#L714]).
> In one place we set it to 1.0 and in the other to 0.1.
> We can change the one of train() method to 0.1. The method is marked with
> DeveloperApi so it should not affect the users. Based on what I saw, whenever
> we use the particular method we provide all parameters, so the default does
> not matter. Only exception is the unit-tests on ALSSuite but the change does
> not break them.
> This change was discussed on a separate PR and [~mlnick]
> [suggested|https://github.com/apache/spark/pull/17059#issuecomment-283333572]
> to create a separate PR & ticket.
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