Github user jkbradley commented on a diff in the pull request: https://github.com/apache/spark/pull/7538#discussion_r36361305 --- Diff: mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala --- @@ -408,6 +451,119 @@ private[classification] class MultiClassSummarizer extends Serializable { } /** + * Abstraction for multinomial Logistic Regression Training results. + */ +sealed trait LogisticRegressionTrainingSummary extends Serializable { + + /** objective function (scaled loss + regularization) at each iteration. */ + val objectiveHistory: Array[Double] + + /** Number of training iterations until termination */ + val totalIterations: Int = objectiveHistory.length + +} + +/** + * Abstraction for Logistic Regression Results for a given model. + */ +sealed trait LogisticRegressionSummary extends Serializable { --- End diff -- This trait can have defs for predictions, probabilityCol, labelCol.
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