def test_invalid_edge(self):
G = nx.path_graph(4)
assert not nx.is_matching(G, {(0, 3), (1, 2)})
assert not nx.is_matching(G, {(0, 4)})
G = nx.path_graph(4, create_using=nx.DiGraph)
assert nx.is_matching(G, {(0, 1)})
assert not nx.is_matching(G, {(1, 0)})
def test_matching_bqm(self):
bqm = dnx.matching_bqm(self.graph)
# the ground states should be exactly the matchings of G
sampleset = dimod.ExactSolver().sample(bqm)
for sample, energy in sampleset.data(['sample', 'energy']):
edges = [v for v, val in sample.items() if val > 0]
self.assertEqual(nx.is_matching(self.graph, edges), energy == 0)
self.assertTrue(energy == 0 or energy >= 1)
# while we're at it, test deprecated is_matching
with self.assertWarns(DeprecationWarning):
self.assertEqual(nx.is_matching(self.graph, edges),
dnx.is_matching(edges))
def check_component(component, structure):
"""
Check whether any maximum cardinality matching of the given connected
component of the symmetrization graph can respect ground truth
"""
# Set the minimum observed distance of this component to be infinity
minimum = float("inf")
# Get the size of the maximum cardinality matching of this component
max_matching_size = len(
nx.max_weight_matching(component, maxcardinality=True))
# Iterate over all subsets of edges of the component that are the same
# size as the maximum cardinality matching
for matching in itertools.combinations(component.edges(),
max_matching_size):
# Check that this is in fact a matching
if nx.is_matching(component, matching):
# Use helper to compute the minimum length edge of this matching
minimum = min(minimum, check_matching(matching, structure))
# Return the minimum observed distance for this component
return minimum
def is_matching(G, Matching):
"""
Determines if given graph is matching to given matching params
Returns Boolean
"""
if not G and not Matching:
raise Exception("Please provide Graph and Matching params")
return nx.is_matching(G, Matching)
def is_valid_matching(matching_graph: nx.Graph,
solutions: List[MatchingSolution]) -> bool:
for solution in solutions:
if solution is None or not nx.is_matching(matching_graph,
set(solution)):
return False
return True
def max_matchings(graph):
"""
Return an itertor over the maximum cardinality matchings of the graph
"""
matching_size = len(nx.max_weight_matching(graph, maxcardinality=True))
for matching in itertools.combinations(graph.edges(), matching_size):
if nx.is_matching(graph, matching):
yield matching
def test_respect_matching(self):
"""
Test that a maximum cardinality matching is activated
"""
active_graph = TestClusteringCSP.symgraph.active_graph()
solution = TestClusteringCSP.formula.solve()
active_edges = [(alpha, beta) for vtype, alpha, beta in solution
if vtype == sat.Formula.ACT_VAR]
# Iterate over the active complex components of the symgraph
for cc in nx.connected_component_subgraphs(active_graph):
edges = [(a, b) for a, b in active_edges
if a in cc.nodes() and b in cc.nodes()]
self.assertTrue(nx.is_matching(cc, edges))
def test_empty_matching(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, set()))
def test_dict(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, {0: 1, 1: 0, 2: 3, 3: 2}))
def test_invalid(self):
G = nx.path_graph(4)
assert_false(nx.is_matching(G, {(0, 1), (1, 2), (2, 3)}))
def test_valid(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, {(0, 1), (2, 3)}))
def test_valid(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, {(0, 1), (2, 3)}))
def test_empty_matching(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, set()))
def test_dict(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, {0: 1, 1: 0, 2: 3, 3: 2}))
def is_matching(G, s):
return nx.is_matching(G, s)
def test_single_edge(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, {(1, 2)}))
def test_edge_order(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, {(0, 1), (2, 3)}))
assert_true(nx.is_matching(G, {(1, 0), (2, 3)}))
assert_true(nx.is_matching(G, {(0, 1), (3, 2)}))
assert_true(nx.is_matching(G, {(1, 0), (3, 2)}))
def test_single_edge(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, {(1, 2)}))
def test_invalid(self):
G = nx.path_graph(4)
assert_false(nx.is_matching(G, {(0, 1), (1, 2), (2, 3)}))
def test_edge_order(self):
G = nx.path_graph(4)
assert_true(nx.is_matching(G, {(0, 1), (2, 3)}))
assert_true(nx.is_matching(G, {(1, 0), (2, 3)}))
assert_true(nx.is_matching(G, {(0, 1), (3, 2)}))
assert_true(nx.is_matching(G, {(1, 0), (3, 2)}))