 We can interpret this as a random graph model consisting of formula_20 distinct Erdős–Rényi graphs with parameters formula_22 respectively, with bigraphs between them where each possible edge between blocks formula_23 and formula_24 is included independently with probability formula_18.Many other popular random graph models can be understood as exchangeable random graph models defined by some graphon, a detailed survey is included in Orbanz and Roy.A random graph of size formula_26 can be represented as a random formula_27 adjacency matrix.