minibatch kmeans added
reverted to random algo
Merge pull request #1827 from mazumdarparijat/fastkmeans

mini-batch KMeans Added
Merge pull request #1829 from votjakovr/feature/gp_refactoring

Various minor fixes in GPs framework
minor changes in KMeans
Merge pull request #1831 from mazumdarparijat/fastkmeans

minor changes in KMeans