Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5697#discussion_r29103607
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
---
@@ -77,6 +77,11 @@ sealed trait Vector extends Serializable {
// refer to {@link java.util.Arrays.equals} for hash algorithm
val bits = java.lang.Double.doubleToLongBits(value)
result = 31 * result + (bits ^ (bits >>> 32)).toInt
+ i += 1
+ // only scan the first 16 nonzeros
+ if (i > 16) {
+ return result
--- End diff --
`foreachActive` is usually on the critical path. This hashCode
implementation is only for the cases when the vector is used as a map key, as
in the Pyrolite SerDe. I added specialized version for DenseVector and
SparseVector.
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