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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