Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5913#discussion_r29726774
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
---
@@ -150,6 +150,26 @@ sealed trait Vector extends Serializable {
toDense
}
}
+
+ /**
+ * Find the index of a maximal element. Returns the first maximal
element in case of a tie.
+ * Returns -1 if vector has length 0.
+ */
+ private[spark] def findMax: Int = {
--- End diff --
`findMax` -> `argmax`? I think we can put this in a separate PR or move it
to `DenseVector` only. The problem is with sparse vectors, where we need to
return an index with value zero if nonzero elements are negative.
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