Figure 1
From: Inverse Resolution Limit of Partition Density and Detecting Overlapping Communities by Link-Surprise

Definition of partition density. A toy example shows how partition density is calculated. The local partition density of the blue nodes D 1 is one because it is a clique, while that of the red nodes D 2 is less than one. The total partition density D of the community structure is the weighted sum of two local partition densities, 0.9.