volume

volume(G, S, weight=None)

Returns the volume of a set of nodes.

The volume of a set S is the sum of the (out-)degrees of nodes in S (taking into account parallel edges in multigraphs). [1]

Parameters

GNetworkX graph

Scollection

A collection of nodes in G.

weightobject

Edge attribute key to use as weight. If not specified, edges have weight one.

Returns

number

The volume of the set of nodes represented by S in the graph G.

See also

conductance

cut_size

edge_expansion

edge_boundary

normalized_cut_size

References

1

David Gleich. Hierarchical Directed Spectral Graph Partitioning. <https://www.cs.purdue.edu/homes/dgleich/publications/Gleich%202005%20-%20hierarchical%20directed%20spectral.pdf>