This class implements the "Epidemic Community Detection Algorithm" as
presented by Raghavan et al. It also serves as base class for all
algorithms using the epidemic label propagation paradigm.
U. N. Raghavan, R. Albert, and S. Kumara, “Near Linear Time Al-
gorithm to Detect Community Structures in Large-scale Networks,”
Physical Review E (Statistical, Nonlinear, and Soft Matter
Physics), vol. 76, no. 3, 2007.