Github user Yunni commented on the issue:
https://github.com/apache/spark/pull/15874
Hi @jkbradley,
**MinHash**
Yes, I agree that I shouldn't have said it's perfect hashing.
Theoretically, it should be Min-wise Independent Permutation Family. What we
used here is 2-independent (or 2-universal) hash families, which is
approximately min-wise independent.
Reference: http://people.csail.mit.edu/mip/papers/kwise-lb/kwise-lb.pdf
**approxNearestNeighbors**
I still think in the case of OR-amplification, the only way is to scan a
number of candidates k times the average bucket size. I would like to
understand more about what you proposed. I have left the note in the scaladoc
and let us have more discussion in future releases.
**AND-amplification**
I've open a ticket in SPARK-18450 for AND-amplification. I am wondering if
we are including it in 2.1.0?
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