zhengruifeng commented on a change in pull request #25178: [SPARK-28421][ML]
SparseVector.apply performance optimization
URL: https://github.com/apache/spark/pull/25178#discussion_r305176615
##########
File path: mllib-local/src/main/scala/org/apache/spark/ml/linalg/Vectors.scala
##########
@@ -603,6 +603,19 @@ class SparseVector @Since("2.0.0") (
private[spark] override def asBreeze: BV[Double] = new BSV[Double](indices,
values, size)
+ override def apply(i: Int): Double = {
+ if (i < 0 || i >= size) {
+ throw new IndexOutOfBoundsException(s"Index $i out of bounds [0, $size)")
+ }
+
+ if (indices.isEmpty || i < indices(0) || i > indices(indices.length - 1)) {
Review comment:
@srowen I add the checks just because in the impl of `findOffset` in
`breeze.collection.mutable.SparseArray`,
it says `// special case for end of list - this is a big win for growing
sparse arrays`, and I think it is reasonable.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
