Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/5756#discussion_r29301064
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
---
@@ -116,6 +116,39 @@ sealed trait Vector extends Serializable {
* with type `Double`.
*/
private[spark] def foreachActive(f: (Int, Double) => Unit)
+
+ /**
+ * Number of active entries. Inactive entries are all zeros, while
active entries could be zero.
--- End diff --
Better phrasing: An "active entry" is an element which is explicitly
stored, regardless of its value. Note that inactive entries have value 0.
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