Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6538#discussion_r31472424
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala ---
@@ -82,6 +82,19 @@ object MLUtils {
val value = indexAndValue(1).toDouble
(index, value)
}.unzip
+
+ // check if indices is one-based and in ascending order
--- End diff --
indices is -> indices are
You can also use `require` I suppose.
Haven't we lost the check for a index of 0 though now?
You could write this check in one line as something like
`require(indices.sliding(2).forall(p => p(0) < p(1)))`
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