Github user tmyklebu commented on a diff in the pull request:
https://github.com/apache/spark/pull/493#discussion_r12019270
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/recommendation/ALS.scala ---
@@ -17,7 +17,7 @@
package org.apache.spark.mllib.recommendation
-import scala.collection.mutable.{ArrayBuffer, BitSet}
+import scala.collection.mutable.{ArrayBuffer, BitSet, HashSet, HashMap}
--- End diff --
Leaving the BitSet alone for now; that's a different piece of code. Doing
that for HashSet and HashMap.
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