add TODO

apache · Mar 1, 2016 · ef176e6 · ef176e6
1 parent 4353e02
commit ef176e6
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/BlockMatrix.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/BlockMatrix.scala
@@ -326,6 +326,7 @@ class BlockMatrix @Since("1.3.0") (
    *         of `this` and `other`.
    * Note: `blockMap` ONLY works for `add` and `subtract` methods and it does not support
    * operators such as (a, b) => -a + b
+   * TODO: Make the use of zero matrices more storage efficient.
    */
   private[mllib] def blockMap(
       other: BlockMatrix,