[jira] [Created] (SPARK-29363) o.a.s.ml.regression.Regressor should be public

["Maciej Szymkiewicz (Jira)" <ji...@apache.org>]

Maciej Szymkiewicz created SPARK-29363:
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             Summary: o.a.s.ml.regression.Regressor should be public
                 Key: SPARK-29363
                 URL: https://issues.apache.org/jira/browse/SPARK-29363
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 2.4.4, 2.3.0, 3.0.0
            Reporter: Maciej Szymkiewicz


At the moment [{{o.a.s.ml.regression.Regressor}}|https://github.com/apache/spark/blob/8556710409d9f2fbaee9dbf76a2ea70218316693/mllib/src/main/scala/org/apache/spark/ml/regression/Regressor.scala#L31] is marked as {{private[spark]}}.

This however is inconsistent with the rest of the API:

* Similarly positioned {{o.a.s.ml.classification.Classifier}} [is public|https://github.com/apache/spark/blob/7955b3962ac46b89564e0613db7bea98a1478bf2/mllib/src/main/scala/org/apache/spark/ml/classification/Classifier.scala#L57-L58].
* Accompanying {{o.a.s.regression.RegressionModel}} [is public|https://github.com/apache/spark/blob/8556710409d9f2fbaee9dbf76a2ea70218316693/mllib/src/main/scala/org/apache/spark/ml/regression/Regressor.scala#L49]

Additionally it hides useful information from the end user, who might be interested in defining methods which operate specifically on {{Regressors}} (should other regressor-like {{Estimators}} extend {{Regressor}} as well? Let's say {{DecisionTreeRegressor}}).



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