zhengruifeng commented on a change in pull request #26982: [SPARK-30329][ML]
add iterator/foreach methods for Vectors
URL: https://github.com/apache/spark/pull/26982#discussion_r360864156
##########
File path: mllib-local/src/main/scala/org/apache/spark/ml/linalg/Vectors.scala
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@@ -753,6 +782,39 @@ class SparseVector @Since("2.0.0") (
}.unzip
new SparseVector(selectedIndices.length, sliceInds.toArray,
sliceVals.toArray)
}
+
+ @Since("3.0.0")
+ override def iterator: Iterator[(Int, Double)] = {
Review comment:
The complexity of traversal all elements is O(size), while the complexity of
`var i = 0; while(i<vec.size) {val v = vec(i); i+=1}` is O(size * log(nnz))
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