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Absolute estimate error (plotted in blue, in the units on the right axes) and running time (plotted in black, in minutes on the left axes) of the EM-kernel-PCD algorithm in the tree-structure HMRFs and the grid-structure HMRFs when we choose different n values; n is the number of MCMC steps for advancing particles in the PCD algorithm. The absolute estimate error in the first 400 iterations is not shown in the plots.
