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Stochastic block model

Hi all,

I would like to draw a random graph by Sage. The general stochastic model is the following: The graph contains $n$ vertices and the n vertices are divided into $r$ communities $C_1\cdots,C_r$. For two vertices within the same community, there is a probability $P_r$ that they are connected directly by an edge. How do I plot such a graph in Sage? References appreciated.