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I am a former PhD student in theoretical computer science at Stanford University under the late Rajeev Motwani .

David Arthur

http://www.stanford.edu/~darthur/

http://en.wikipedia.org/wiki/K-means%2B%2B

In data mining , k -means++ [ 1 ] [ 2 ] is an algorithm for choosing the initial values (or "seeds") for the k -means clustering algorithm.

K-means++ - Wikipedia, the free encyclopedia

Are approximation algorithms for consensus clustering worthwhile

Clustering - Introduction