Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/9843#discussion_r45461570
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/feature/IDF.scala ---
@@ -218,7 +218,7 @@ private object IDFModel {
newValues(k) = values(k) * idf(indices(k))
k += 1
}
- Vectors.sparse(n, indices, newValues)
+ Vectors.sparse(n, indices, newValues).toSparse
--- End diff --
Hm, isn't this an optimization to make straight in the `Vectors.sparse`
method? it doesn't make sense that you have to call `toSparse` on its output,
that that would have any effect.
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