Github user selvinsource commented on the pull request:

    https://github.com/apache/spark/pull/3062#issuecomment-73426635
  
    @mengxr @srowen 
    I created the PMMLExportable trait and moved all the code under the package 
mllib.pmml.
    Supported models implements now this trait and the usage is as you 
envisaged:
    `val pmml = kmeansModel.toPMML()`
    
    I added also extra export options, respectively File and OutputStream:
    `kmeansModel.toPMML("/tmp/kmeans.xml")`
    `kmeansModel.toPMML(System.out)`
    Feel free to review those, I would suggest to keep at least the 
OutputStream which is well known.


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