Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/685#issuecomment-44878888
sparse vector: (size,[i0,i1],[v0,v1])
This is not standard libsvm (glmnet-R, libsvm etc who expects libsvm input
won't work with this)...may be we can add a helper function to convert it to
i0:v0, i1:v1, .... for libsvm packages...
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