Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/3536#issuecomment-98425139
@MLnick @srowen I did an experiment where I computed brute force topK
similar items using cosine distance and compared the intersection with item
factor based brute force topK similar items using cosine distance after running
implicit factorization...intersection is only 42%...this is inline with Google
Correlate paper where they have to do an additional reorder step in real
feature space to increase the recall (intersect)...did you guys also see
similar results for item->item validation ?
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