Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/16699#discussion_r124212354
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/Instance.scala
---
@@ -27,3 +27,28 @@ import org.apache.spark.ml.linalg.Vector
* @param features The vector of features for this data point.
*/
private[ml] case class Instance(label: Double, weight: Double, features:
Vector)
+
+/**
+ * Case class that represents an instance of data point with
+ * label, weight, offset and features.
--- End diff --
Add doc ```This is mainly used in GeneralizedLinearRegression currently```.
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