Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/4109#discussion_r23589776
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/BLAS.scala ---
@@ -257,30 +257,30 @@ private[spark] object BLAS extends Serializable with
Logging {
/**
* C := alpha * A * B + beta * C
- * @param transA whether to use the transpose of matrix A (true), or A
itself (false).
- * @param transB whether to use the transpose of matrix B (true), or B
itself (false).
* @param alpha a scalar to scale the multiplication A * B.
* @param A the matrix A that will be left multiplied to B. Size of m x
k.
* @param B the matrix B that will be left multiplied by A. Size of k x
n.
* @param beta a scalar that can be used to scale matrix C.
- * @param C the resulting matrix C. Size of m x n.
+ * @param C the resulting matrix C. Size of m x n. C.isTransposed must
be false. In other words,
+ * C cannot be the product of a `transpose()` call, or be
converted from a transposed
--- End diff --
The last sentence is a little misleading. `C` could come from
`transpose.transpose`. We can remove the last sentence completely.
"C.isTransposed must be false.` is already sufficient.
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