Find a maximal cardinality matching in the graph.
A matching is a subset of edges in which no node occurs more than once. The cardinality of a matching is the number of matched edges.
Parameters: G (NetworkX graph) – Undirected graph Returns: matching – A maximal matching of the graph. Return type: set
The algorithm greedily selects a maximal matching M of the graph G (i.e. no superset of M exists). It runs in time.