Github user mateiz commented on the pull request:

    https://github.com/apache/spark/pull/1871#issuecomment-51730712
  
    Just FYI, mutable.HashMap can be pretty inefficient in space usage, 
compared e.g. to java.util.HashMap or to Spark's AppendOnlyMap. In this case it 
will depend on how many keys there are and how big the arrays of floats are (if 
that's the bulk of the data, it won't matter).


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