Daniel Li created SPARK-20485:
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             Summary: Split ALS.scala into multiple files
                 Key: SPARK-20485
                 URL: https://issues.apache.org/jira/browse/SPARK-20485
             Project: Spark
          Issue Type: Improvement
          Components: ML, MLlib
    Affects Versions: 2.1.0
            Reporter: Daniel Li
            Priority: Trivial


The file {{/mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala}} 
currently contains four top-level classes that span 1,500+ lines.  To make the 
file easier to navigate, and to bring it in line with the [Scala style 
guide|http://docs.scala-lang.org/style/files.html], I propose we split it into 
four files holding their respective classes: {{ALS.scala}}, 
{{ALSParams.scala}}, {{ALSModel.scala}}, and {{ALSModelParams.scala}}.



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