Github user gaborhermann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2838#discussion_r88868762
--- Diff:
flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/pipeline/Predictor.scala
---
@@ -267,6 +401,21 @@ trait PredictOperation[Instance, Model, Testing,
Prediction] extends Serializabl
def predict(value: Testing, model: Model): Prediction
}
+/**
+ * Operation for preparing a testing [[DataSet]] for evaluation.
+ *
+ * The most commonly [[EvaluateDataSetOperation]] is used, but evaluation
of
+ * ranking recommendations need input in a different form.
+ */
+trait PrepareOperation[Instance, Testing, Prepared] extends Serializable {
--- End diff --
`PrepareOperation` is the common trait for `EvaluateDataSetOperation` and
preparing ranking evaluation.
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