Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/15628#discussion_r107307120
--- Diff:
mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala ---
@@ -161,6 +162,109 @@ sealed trait Matrix extends Serializable {
*/
@Since("2.0.0")
def numActives: Int
+
+ /**
+ * Converts this matrix to a sparse matrix.
+ *
+ * @param colMajor Whether the values of the resulting sparse matrix
should be in column major
+ * or row major order. If `false`, resulting matrix
will be row major.
+ */
+ private[ml] def toSparseMatrix(colMajor: Boolean): SparseMatrix
+
+ /**
+ * Converts this matrix to a sparse matrix in column major order.
+ */
+ @Since("2.2.0")
+ def toCSC: SparseMatrix = toSparseMatrix(colMajor = true)
+
+ /**
+ * Converts this matrix to a sparse matrix in row major order.
+ */
+ @Since("2.2.0")
+ def toCSR: SparseMatrix = toSparseMatrix(colMajor = false)
+
+ /**
+ * Converts this matrix to a sparse matrix in column major order.
+ */
+ @Since("2.2.0")
+ def toSparse: SparseMatrix = toSparseMatrix(colMajor = true)
+
+ /**
+ * Converts this matrix to a dense matrix.
+ *
+ * @param colMajor Whether the values of the resulting dense matrix
should be in column major
+ * or row major order. If `false`, resulting matrix
will be row major.
+ */
+ private[ml] def toDenseMatrix(colMajor: Boolean): DenseMatrix
+
+ /**
+ * Converts this matrix to a dense matrix in column major order.
+ */
+ @Since("2.2.0")
+ def toDense: DenseMatrix = toDenseMatrix(colMajor = true)
+
+ /**
+ * Converts this matrix to a dense matrix in row major order.
+ */
+ @Since("2.2.0")
+ def toDenseRowMajor: DenseMatrix = toDenseMatrix(colMajor = false)
+
+ /**
+ * Converts this matrix to a dense matrix in column major order.
+ */
+ @Since("2.2.0")
+ def toDenseColMajor: DenseMatrix = toDenseMatrix(colMajor = true)
+
+ /**
+ * Returns a matrix in either dense or sparse format, whichever uses
less storage.
+ *
+ * @param colMajor Whether the values of the resulting matrix should be
in column major
+ * or row major order. If `false`, resulting matrix
will be row major.
+ */
+ @Since("2.2.0")
+ def compressed(colMajor: Boolean): Matrix = {
--- End diff --
Let's make it private, and follow the previous style. Should add
`compressedRowMajor`, `compressedColumnMajor` since it can be dense matrix in
certain situations.
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