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**************
Graph Matching
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Given a graph G = (V,E), a matching M in G is a set of pairwise non-adjacent
edges; that is, no two edges share a common vertex.

`Wikipedia: Matching <https://en.wikipedia.org/wiki/Matching_(graph_theory)>`_
    Nmin_maximal_matchingc                 .    [         R                  " U 5      $ )a  Returns the minimum maximal matching of G. That is, out of all maximal
matchings of the graph G, the smallest is returned.

Parameters
----------
G : NetworkX graph
  Undirected graph

Returns
-------
min_maximal_matching : set
  Returns a set of edges such that no two edges share a common endpoint
  and every edge not in the set shares some common endpoint in the set.
  Cardinality will be 2*OPT in the worst case.

Notes
-----
The algorithm computes an approximate solution for the minimum maximal
cardinality matching problem. The solution is no more than 2 * OPT in size.
Runtime is $O(|E|)$.

References
----------
.. [1] Vazirani, Vijay Approximation Algorithms (2001)
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