Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/5756#discussion_r29301001
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
---
@@ -525,6 +558,34 @@ class DenseVector(val values: Array[Double]) extends
Vector {
}
result
}
+
+ override def numActives: Int = size
+
+ override def numNonzeros: Int = {
+ // same as values.count(_ != 0.0) but faster
+ var nnz = 0
+ values.foreach { v =>
--- End diff --
Is foreach as fast as a while loop?
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