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Compute the preferential attachment score of all node pairs in ebunch.
Preferential attachment score of \(u\) and \(v\) is defined as\[|\Gamma(u)| |\Gamma(v)|\]
where \(\Gamma(u)\) denotes the set of neighbors of \(u\).
G : graph
NetworkX undirected graph.
ebunch : iterable of node pairs, optional (default = None)
Preferential attachment score will be computed for each pair of nodes given in the iterable. The pairs must be given as 2-tuples (u, v) where u and v are nodes in the graph. If ebunch is None then all non-existent edges in the graph will be used. Default value: None.
piter : iterator
An iterator of 3-tuples in the form (u, v, p) where (u, v) is a pair of nodes and p is their preferential attachment score.
[R264] D. Liben-Nowell, J. Kleinberg. The Link Prediction Problem for Social Networks (2004). http://www.cs.cornell.edu/home/kleinber/link-pred.pdf
>>> import networkx as nx >>> G = nx.complete_graph(5) >>> preds = nx.preferential_attachment(G, [(0, 1), (2, 3)]) >>> for u, v, p in preds: ... '(%d, %d) -> %d' % (u, v, p) ... '(0, 1) -> 16' '(2, 3) -> 16'