Github user codedeft commented on the pull request:
https://github.com/apache/spark/pull/3094#issuecomment-61762230
Sounds good. I'll create a story for this.
In addition to using internal formats for more efficiency, perhaps there
are also some minor things such as separating label as a different RDD from
features so that label can be updated while features stay the same.
Maybe all these are under the same MLLib API optimization umbrella.
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