Github user derrickburns commented on the pull request:

    https://github.com/apache/spark/pull/4144#issuecomment-70946101
  
    @mengxr
    
    It looks like the final costs rdd is still persisted in exit from the 
initialization method.
    
    Sent from my iPhone
    
    > On Jan 21, 2015, at 3:37 PM, Xiangrui Meng <[email protected]> 
wrote:
    > 
    > @derrickburns This PR doesn't handle sparse centers. The dense one should 
work with feature dimension up to 10m, which may cover many cases already. We 
can solve that issue in a separate PR. Does the changes in this PR look good to 
you? (It seems that there is something wrong with Jenkins.)
    > 
    > Feel free to port the features and it would be great if you can help test 
the performance:)
    > 
    > —
    > Reply to this email directly or view it on GitHub.
    > 


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