Github user jkbradley commented on the issue: https://github.com/apache/spark/pull/15148 Good points: Array of Vectors sounds good to me. There has been a lot of discussion. I'm going to try to summarize things in a follow-up JIRA, which I'll link here shortly. LSH turned out to be a much messier area than I expected; thanks a lot to everyone for all of the post-hoc reviews and discussions!
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