Github user erikerlandson commented on the pull request: https://github.com/apache/spark/pull/1964#issuecomment-53445323 @yu-iskw, I'm in favor of adopting a standardized distance metric class. How best to proceed is a question of architecture and road map. I'm interested in @mengxr 's opinions on where to take it from here, as it would have a nontrivial impact on MLLib interfaces.
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