Matching

A matching is a subset of graph edges in which no vertex occurs more than once.

A matching for a Chimera unit cell: no vertex is incident to more than one edge in the set of blue edges

min_maximal_matching(G[, sampler])	Returns an approximate minimum maximal matching.
is_matching(edges)	Determines whether the given set of edges is a matching.
is_maximal_matching(G, matching)	Determines whether the given set of edges is a maximal matching.