A fundamental problem in network data analysis is to test Erd\"{o}s-R\'{e}nyi
model $\mathcal{G}\left(n,\frac{a+b}{2n}\right)$ versus a bisection stochastic
block model $\mathcal{G}\left(n,\frac{a}{n},\frac{b}{n}\right)$, where $a,b>0$
are constants that represent the expected degrees