Note

This documents the development version of NetworkX. Documentation for the current release can be found here.

Similarity Measures

Functions measuring similarity using graph edit distance.

The graph edit distance is the number of edge/node changes needed to make two graphs isomorphic.

The default algorithm/implementation is sub-optimal for some graphs. The problem of finding the exact Graph Edit Distance (GED) is NP-hard so it is often slow. If the simple interface graph_edit_distance takes too long for your graph, try optimize_graph_edit_distance and/or optimize_edit_paths.

At the same time, I encourage capable people to investigate alternative GED algorithms, in order to improve the choices available.

graph_edit_distance(G1, G2[, node_match, …])

Returns GED (graph edit distance) between graphs G1 and G2.

optimal_edit_paths(G1, G2[, node_match, …])

Returns all minimum-cost edit paths transforming G1 to G2.

optimize_graph_edit_distance(G1, G2[, …])

Returns consecutive approximations of GED (graph edit distance) between graphs G1 and G2.

optimize_edit_paths(G1, G2[, node_match, …])

GED (graph edit distance) calculation: advanced interface.

simrank_similarity(G[, source, target, …])

Returns the SimRank similarity of nodes in the graph G.

simrank_similarity_numpy(G[, source, …])

Calculate SimRank of nodes in G using matrices with numpy.