Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/2451#discussion_r17801072
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -37,11 +44,197 @@ trait Matrix extends Serializable {
private[mllib] def toBreeze: BM[Double]
/** Gets the (i, j)-th element. */
- private[mllib] def apply(i: Int, j: Int): Double = toBreeze(i, j)
+ private[mllib] def apply(i: Int, j: Int): Double
+
+ /** Return the index for the (i, j)-th element in the backing array. */
+ private[mllib] def index(i: Int, j: Int): Int
+
+ /** Update element at (i, j) */
+ private[mllib] def update(i: Int, j: Int, v: Double): Unit
+
+ /** Get a deep copy of the matrix. */
+ def copy: Matrix
+ /** Convenience method for `Matrix`-`Matrix` multiplication.
+ * Note: `SparseMatrix`-`SparseMatrix` multiplication is not supported
*/
--- End diff --
Just wondering (not sure myself): Which is prefered:
`SparseMatrix`
or
[[SparseMatrix]]
in docs?
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