Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9524#discussion_r45669679
--- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/Split.scala ---
@@ -85,7 +85,7 @@ final class CategoricalSplit private[ml] (
/**
* If true, then "categories" is the set of categories for splitting to
the left, and vice versa.
*/
- private val isLeft: Boolean = _leftCategories.length <= numCategories / 2
+ private[ml] val isLeft: Boolean = _leftCategories.length <=
numCategories / 2
/** Set of categories determining the splitting rule, along with
[[isLeft]]. */
private val categories: Set[Double] = {
--- End diff --
For this, I will use BitSet with Int.
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