def test_to_vertex_cover(self):
        matching = maximum_matching(self.graph)
        vertex_cover = to_vertex_cover(self.graph, matching)
        self.check_vertex_cover(vertex_cover)
Increment or decrement a key by a provided delta.
dataset/ETHPy150Open networkx/networkx/networkx/algorithms/bipartite/tests/test_matching.py/TestMatching.test_to_vertex_cover--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/memcache/__init__.py/Client._incrdecr