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https://issues.apache.org/jira/browse/SPARK-20484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-20484.
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Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 17793
[https://github.com/apache/spark/pull/17793]
> Add documentation to ALS code
> -----------------------------
>
> Key: SPARK-20484
> URL: https://issues.apache.org/jira/browse/SPARK-20484
> Project: Spark
> Issue Type: Improvement
> Components: ML, MLlib
> Affects Versions: 2.1.0
> Reporter: Daniel Li
> Priority: Trivial
> Fix For: 2.3.0
>
>
> The documentation (both Scaladocs and inline comments) for the ALS code (in
> package {{org.apache.spark.ml.recommendation}}) can be clarified where needed
> and expanded where incomplete. This is especially important for parts of the
> code that are written imperatively for performance, as these parts don't
> benefit from the intuitive self-documentation of Scala's higher-level
> language abstractions. Specifically, I'd like to add documentation fully
> explaining the key functionality of the in-block and out-block objects, their
> purpose, how they relate to the overall ALS algorithm, and how they are
> calculated in such a way that new maintainers can ramp up much more quickly.
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