networkx.algorithms.components.condensation¶

condensation
(G, scc=None)[source]¶ Returns the condensation of G.
The condensation of G is the graph with each of the strongly connected components contracted into a single node.
Parameters:  G (NetworkX DiGraph) – A directed graph.
 scc (list or generator (optional, default=None)) – Strongly connected components. If provided, the elements in
scc
must partition the nodes inG
. If not provided, it will be calculated as scc=nx.strongly_connected_components(G).
Returns: C – The condensation graph C of G. The node labels are integers corresponding to the index of the component in the list of strongly connected components of G. C has a graph attribute named ‘mapping’ with a dictionary mapping the original nodes to the nodes in C to which they belong. Each node in C also has a node attribute ‘members’ with the set of original nodes in G that form the SCC that the node in C represents.
Return type: NetworkX DiGraph
Raises: NetworkXNotImplemented: – If G is undirected.
Notes
After contracting all strongly connected components to a single node, the resulting graph is a directed acyclic graph.