Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/6538#discussion_r31504366 --- 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 -- Yeah, that's fair enough. I don't think this is a performance-critical block anyway, but the cleverness is probably a step too far in complexity. This needs a little rebase, and i think you can still use `require` for the check. This allows `indices(0) == 0`. Do you mean to initialize `previous = 0`?
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