Github user rezazadeh commented on the pull request:
https://github.com/apache/spark/pull/1778#issuecomment-53975250
Style changes made. Experimental results below.
We run DIMSUM daily on a production-scale ads dataset. After replacing the
traditional cosine similarity computation in late June, we observe 40%
improvement in several performance measures, plotted below. The top of the
y-axis is around 100TB.
For correctness proof, see Theorem 4.3 in
http://stanford.edu/~rezab/papers/dimsum.pdf
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