Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6904#discussion_r33684155
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -592,6 +614,19 @@ class SparseMatrix(
def toDense: DenseMatrix = {
new DenseMatrix(numRows, numCols, toArray)
}
+
+ override def numNonzeros: Int = {
+ var nnz = 0
--- End diff --
Can this not be `values.count(_ != 0)`?
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