http://www.mitpressjournals.org/loi/neco

Ji Zhao, Deyu Meng. FastMMD: Ensemble of Circular Discrepancy for Efficient Two-Sample Test, Neural Computation, 2015, accepted. Matlab Code. (Our proposed FastMMD method decreases the time complexity of MMD calculation from conventional O(N^2d) to O(Nlog(d)))