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https://issues.apache.org/jira/browse/SPARK-4875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley closed SPARK-4875.
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Resolution: Duplicate
> Separate Transformer, Estimator params
> --------------------------------------
>
> Key: SPARK-4875
> URL: https://issues.apache.org/jira/browse/SPARK-4875
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 1.2.0
> Reporter: Joseph K. Bradley
> Priority: Minor
>
> Currently, in spark.ml, an Estimator and its Model (Transformer) both use the
> same set of parameters. (E.g., LogisticRegression) The problem is that some
> Estimator parameters are not relevant for Transformers, so it is non-sensical
> to include them in the Transformers.
> Proposal: When a parameter is only relevant to the Estimator, only include it
> in the Estimator. In these cases, if there is a separate parameter trait
> (e.g., LogisticRegressionParams), that trait should be separated into a model
> params trait and an estimator params trait which inherits from the model
> params:
> {code}
> trait LogisticRegressionModelParams
> trait LogisticRegressionParams extends LogisticRegressionModelParams
> {code}
> In cases where the 2 classes use the same set of parameters, then they may
> share the same params trait.
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