Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5081#discussion_r26664036
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -100,6 +100,50 @@ sealed trait Matrix extends Serializable {
* corresponding value in the matrix with type `Double`.
*/
private[spark] def foreachActive(f: (Int, Int, Double) => Unit)
+
+ override def hashCode(): Int = {
+ var result: Int = numRows * numCols + 31
+ this.foreachActive { case (rowInd, colInd, value) =>
+ // ignore explict 0 for comparison between sparse and dense
+ if (value != 0) {
+ result = 31 * result + rowInd + (numRows * colInd)
+ // refer to {@link java.util.Arrays.equals} for hash algorithm
+ val bits = java.lang.Double.doubleToLongBits(value)
+ result = 31 * result + (bits ^ (bits >>> 32)).toInt
+ }
+ }
+ result
--- End diff --
Hash `isTransposed`.
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