fast_gnp_random_graph(n, p, seed=None, directed=False)¶
Returns a random graph, also known as an Erdős-Rényi graph or a binomial graph.
The graph algorithm chooses each of the (undirected) or (directed) possible edges with probability .
This algorithm runs in time, where is the expected number of edges, which equals . This should be faster than
gnp_random_graph()when is small and the expected number of edges is small (that is, the graph is sparse).
 Vladimir Batagelj and Ulrik Brandes, “Efficient generation of large random networks”, Phys. Rev. E, 71, 036113, 2005.