Returns Zachary’s Karate Club graph.

Each node in the returned graph has a node attribute ‘club’ that indicates the name of the club to which the member represented by that node belongs, either ‘Mr. Hi’ or ‘Officer’. Each edge has a weight based on the number of contexts in which that edge’s incident node members interacted.



Zachary, Wayne W. “An Information Flow Model for Conflict and Fission in Small Groups.” Journal of Anthropological Research, 33, 452–473, (1977).


To get the name of the club to which a node belongs:

>>> G = nx.karate_club_graph()
>>> G.nodes[5]["club"]
'Mr. Hi'
>>> G.nodes[9]["club"]

Additional backends implement this function

cugraph : GPU-accelerated backend.