Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/12050#discussion_r58801668
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/tree/impl/GradientBoostedTrees.scala
---
@@ -142,6 +158,97 @@ private[ml] object GradientBoostedTrees extends
Logging {
}
/**
+ * Add prediction from a new boosting iteration to an existing
prediction.
+ *
+ * @param features Vector of features representing a single data point.
+ * @param prediction The existing prediction.
+ * @param tree New Decision Tree model.
+ * @param weight Learning rate.
+ * @return Updated prediction.
+ */
+ def updatePrediction(
+ features: Vector,
+ prediction: Double,
+ tree: DecisionTreeRegressionModel,
+ weight: Double): Double = {
+ prediction + tree.rootNode.predictImpl(features).prediction * weight
--- End diff --
Right, you can leave it for now. I agree it should be made public. We can
discuss on [https://issues.apache.org/jira/browse/SPARK-10413]
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