Github user rezazadeh commented on a diff in the pull request:
https://github.com/apache/spark/pull/1778#discussion_r17523232
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
---
@@ -390,6 +393,79 @@ class RowMatrix(
new RowMatrix(AB, nRows, B.numCols)
}
+ /**
+ * Find all similar columns using cosine similarity.
+ *
+ * @return An n x n sparse matrix of cosine similarities between columns
of this matrix.
+ */
+ def similarColumns(): CoordinateMatrix = {
+ similarColumns(Double.PositiveInfinity)
+ }
+
+ /**
+ * Find all similar columns using the DIMSUM sampling algorithm,
described in
+ * http://arxiv.org/abs/1304.1467
+ *
+ * @param gamma The oversampling parameter. For provable results, set to
4 * log(n) / s,
--- End diff --
Changed the interface to the threshold s instead of gamma.
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