Scalable MCMC for Mixed Membership Stochastic Blockmodels


Wenzhe Li, Sungjin Ahn, Max Welling ;
Proceedings of the 19th International Conference on Artificial Intelligence and Statistics, PMLR 51:723-731, 2016.


We propose a stochastic gradient Markov chain Monte Carlo (SG-MCMC) algorithm for scalable inference in mixed-membership stochastic blockmodels (MMSB). Our algorithm is based on the stochastic gradient Riemannian Langevin sampler and achieves both faster speed and higher accuracy at every iteration than the current state-of-the-art algorithm based on stochastic variational inference. In addition we develop an approximation that can handle models that entertain a very large number of communities. The experimental results show that SG-MCMC strictly dominates competing algorithms in all cases.

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