Github user da-steve101 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9020#discussion_r41593650
  
    --- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala 
---
    @@ -512,6 +513,92 @@ object Vectors {
         squaredDistance
       }
     
    +  private def dot(a : DenseVector, b : DenseVector) : Double = {
    +    (a.toArray zip b.toArray).map(x => (x._1 * x._2)).sum
    +  }
    +
    +  private def dot(a : SparseVector, b : DenseVector) : Double = {
    +    (a.indices zip a.values).map(x => { b(x._1)*x._2 }).sum
    --- End diff --
    
    problem is that toBreeze is private ( i don't think it should be but i felt 
i was overstepping to change that ). Also its just a bit annoying from 
programmers perspective. I can see what you are saying, I just think that extra 
step should be inside rather than outside. Really I think all the breeze 
operations should be defined for these vectors (or just use breeze vectors but 
I guess a single vector may need to be distributed).


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