Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/9916#discussion_r49251939
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/BlockMatrix.scala
---
@@ -317,14 +317,18 @@ class BlockMatrix @Since("1.3.0") (
}
/**
- * Adds two block matrices together. The matrices must have the same
size and matching
- * `rowsPerBlock` and `colsPerBlock` values. If one of the blocks that
are being added are
- * instances of [[SparseMatrix]], the resulting sub matrix will also be
a [[SparseMatrix]], even
- * if it is being added to a [[DenseMatrix]]. If two dense matrices are
added, the output will
- * also be a [[DenseMatrix]].
+ * For given matrices `this` and `other` of compatible dimensions and
compatible block dimensions,
+ * it applies an associative binary function on their corresponding
blocks.
--- End diff --
not associative (subtraction is not)
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