Github user hhbyyh commented on a diff in the pull request:
https://github.com/apache/spark/pull/19588#discussion_r148442070
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/VectorIndexer.scala ---
@@ -311,22 +342,39 @@ class VectorIndexerModel private[ml] (
// TODO: Check more carefully about whether this whole class will be
included in a closure.
/** Per-vector transform function */
- private val transformFunc: Vector => Vector = {
+ private lazy val transformFunc: Vector => Vector = {
--- End diff --
how about just move it into 'transform'
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