Fig. 2
From: Comparison method for community detection on brain networks from neuroimaging data
An illustration of calculation of Normalized Mutual Information (NMI) quantifying similarity between two community structures. Colors of the nodes represent assigned community and red circles indicate overlaps in communities. Confusion matrix is used to measure the overlap between the two community structures. In the above figure, Community C1 in Network A corresponds to Community C2 in Network B. The NMI is calculated with the confusion matrix, and gets high when the overlap between the communities is high