Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15277#discussion_r80915095
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/feature/ChiSqSelector.scala ---
@@ -57,22 +69,21 @@ class ChiSqSelectorModel @Since("1.3.0") (
* Preserves the order of filtered features the same as their indices
are stored.
* Might be moved to Vector as .slice
* @param features vector
- * @param filterIndices indices of features to filter
+ * @param filterIndices indices of features to filter, must be ordered
asc
*/
private def compress(features: Vector, filterIndices: Array[Int]):
Vector = {
- val orderedIndices = filterIndices.sorted
--- End diff --
I think there's a better solution still -- accept any input, sort it and
store the sorted array. I do want to avoid this unnecessary assertion about the
input but yeah this can be optimized. I should have pushed on that in the
initial review since it was my intent, and yeah it matters actually.
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