Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/6209#discussion_r30467395
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/BLAS.scala ---
@@ -500,6 +503,55 @@ private[spark] object BLAS extends Serializable with
Logging {
nativeBLAS.dgemv(tStrA, mA, nA, alpha, A.values, mA, x.values, 1, beta,
y.values, 1)
}
+
+ /**
+ * y := alpha * A * x + beta * y
+ * For `DenseMatrix` A and SparseVector x.
+ */
+ private def gemv(
+ alpha: Double,
+ A: DenseMatrix,
+ x: SparseVector,
+ beta: Double,
+ y: DenseVector): Unit = {
+ val mA: Int = A.numRows
+ val nA: Int = A.numCols
+
+ val Avals = A.values
+ var colCounterForA = 0
+
+ var xIndices = x.indices
+ var xNnz = xIndices.size
+ var xValues = x.values
+
+ scal(beta, y)
--- End diff --
check if `beta == 0`
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