kmeans-vector is a Haskell library to perform the k-means clustering algorithm. It is based on the very efficient 'vector' library.
Feel free to contribute, may it be features, performance improvements, etc.
kmeans-vector is much faster than the existing kmeans package. For example, the kmeans package performs k-means on 10000 2D points with k=5 in 21.099s while kmeans-vector does the same in 6.605s. For 50000 3D points, with k=5 still, kmeans-vector performs in 47.853s while I Ctrl+C'd the kmeans version after 6 minutes and a half.
In addition to contributing a feature, Ville Tirronen also claimed to make the library about 50% faster, which was confirmed after running the algorithm on a dataset I had lying around.
This library is written and maintained by Alp Mestanogullari, firstname.lastname@example.org. Ville Tirronen contributed code to the 0.2 version.