Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9524#discussion_r61666349
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/regression/GBTRegressor.scala ---
@@ -209,6 +210,14 @@ final class GBTRegressionModel private[ml](
@Since("1.4.0")
override def treeWeights: Array[Double] = _treeWeights
+ // We use two vals with options rather than lazy vals since we want the
codeGen to be
+ // eagerly evaluated.
+ val (treePredictors, codeGenPredictors) = if (useCodeGen) {
--- End diff --
are these public apis?
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