Figure 1. An illustration of variable-grouping, with seed variables denoted by black disks. Note that each seed variable is connected by an edge to each other variable in its group, as required by the interpolation rule. Right panel: the coarse graph, whose vertices correspond to the fine-scale seed vertices, and their coarse unary potentials account for all the internal energy potentials in their group. Edges connect pairs of coarse-vertices according to topology at the fine scale.
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