Github user xubo245 commented on a diff in the pull request:
https://github.com/apache/spark/pull/14422#discussion_r72890434
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -497,6 +497,20 @@ object DenseMatrix {
}
/**
+ * Generate a `DenseMatrix` consisting of `i.i.d.` uniform random
numbers.
+ *
+ * @param numRows number of rows of the matrix
+ * @param numCols number of columns of the matrix
+ * @return DenseMatrix` with size `numRows` x `numCols` and values in
U(0, 1)
+ */
+ @Since("2.0.0")
+ def rand(numRows: Int, numCols: Int): DenseMatrix = {
+ require(numRows.toLong * numCols <= Int.MaxValue,
+ s"$numRows x $numCols dense matrix is too large to allocate")
+ new DenseMatrix(numRows, numCols, Array.fill(numRows * numCols)((new
Random).nextDouble()))
--- End diff --
Can fix RNG, This makes a new RNG for all element :
val rng = new Random()
new DenseMatrix(numRows, numCols, Array.fill(numRows *
numCols)(rng.nextDouble()))
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