networkx.algorithms.link_prediction.adamic_adar_index¶
-
adamic_adar_index
(G, ebunch=None)[source]¶ Compute the Adamic-Adar index of all node pairs in ebunch.
Adamic-Adar index of
u
andv
is defined as\[\sum_{w \in \Gamma(u) \cap \Gamma(v)} \frac{1}{\log |\Gamma(w)|}\]where \(\Gamma(u)\) denotes the set of neighbors of \(u\). This index leads to zero-division for nodes only connected via self-loops. It is intended to be used when no self-loops are present.
- Parameters
G (graph) – NetworkX undirected graph.
ebunch (iterable of node pairs, optional (default = None)) – Adamic-Adar index 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.
- Returns
piter – An iterator of 3-tuples in the form (u, v, p) where (u, v) is a pair of nodes and p is their Adamic-Adar index.
- Return type
iterator
Examples
>>> G = nx.complete_graph(5) >>> preds = nx.adamic_adar_index(G, [(0, 1), (2, 3)]) >>> for u, v, p in preds: ... print(f"({u}, {v}) -> {p:.8f}") (0, 1) -> 2.16404256 (2, 3) -> 2.16404256
References
- 1
D. Liben-Nowell, J. Kleinberg. The Link Prediction Problem for Social Networks (2004). http://www.cs.cornell.edu/home/kleinber/link-pred.pdf