Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/4109#discussion_r23589782
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -52,10 +58,13 @@ sealed trait Matrix extends Serializable {
/** Get a deep copy of the matrix. */
def copy: Matrix
+ /** Transpose the Matrix */
--- End diff --
It returns a new matrix instance representing the transposed matrix. We
should also mention that they share the same underlying data arrays.
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