Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1778#discussion_r17579662
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
---
@@ -390,6 +393,113 @@ class RowMatrix(
new RowMatrix(AB, nRows, B.numCols)
}
+ /**
+ * Compute all cosine similarities between columns of this matrix using
the brute-force
+ * approach of computing normalized dot products.
+ *
+ * @return An n x n sparse upper-triangular matrix of cosine
similarities between
+ * columns of this matrix.
+ */
+ def columnSimilarities(): CoordinateMatrix = {
+ similarColumns(0.0)
+ }
+
+ /**
+ * Compute all similarities between columns of this matrix using a
sampling approach.
--- End diff --
`all`?
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