Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6538#discussion_r31390293
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala ---
@@ -82,6 +82,8 @@ object MLUtils {
val value = indexAndValue(1).toDouble
(index, value)
}.unzip
+ require(indices.size == 0 || indices(0) >= 0,
--- End diff --
Ah right, missed that in the fold. Would it make more sense to check the
value where it's read rather than after the -1?
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