Github user akopich commented on the pull request:

    https://github.com/apache/spark/pull/1269#issuecomment-66292305
  
    @jkbradley 
    
    Tests fail again... 
    Stab in the dark: looks like something is changed in the testing 
environment. 
    
    (2) Regular and Robust in the same class
    
    It's possible to implement, but I don't want to turn class hierarchy inside 
out. It just violates OOP principles. That's like a car inheriting from SUV. 
    
    (4) Float vs. Double and linear algebra operations
    
    I'd prefer (a). I don't like idea to convert from Array to Breeze matrix 
and vice versa. 
    
    (5)
    
    Glad to read it. Unfortunately, it looks like I've mirrored spark repo a 
while ago, so I've got no mllib/features package. Should I mirror spark repo 
again and send you another pull request? Or is there a way to pull from spark 
repo? 
    
    Looking forward to your reply. 


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