Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/15277#discussion_r80863287
--- 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 --
We can sort it when training rather than storing unsorted indices and
resort them when applying transformation on each vector.
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