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Speed of our variational algorithm (YZShmm) compared to that of Ref. (10) (EMhmm) and vbSPT (2). Time per iteration versus number of steps in the data, which has three diffusive states, was measured on a dual 6-core Intel Xeon 2.4GHz computer running MATLAB R2017a. Linear and quadratic scaling laws are guides to the eye. To see this figure in color, go online.
