def test3_computed_flow(self):
"""
Test 3 is based on
http://en.wikipedia.org/wiki/Edmonds%E2%80%93Karp_algorithm#Example
"""
mf.setup("test3.csv")
mf.maxflow()
self.assertEquals(mf.final_flow(), 5)
def test1_bfs_one_level(self):
mf.setup("test1.csv")
mf.maxflow(bfs_max_iterations=1)
mf.db.execute("SELECT * FROM terminated_paths;")
paths = mf.db.fetchall()
self.assertEquals(len(paths), 2)
self.assertIn(([1, 4], [1, 2, 4]), paths)
self.assertIn(([2, 5], [1, 3, 4]), paths)
def test2_computed_flow(self):
"""
Test 2 is based on
http://en.wikipedia.org/wiki/Ford%E2%80%93Fulkerson_algorithm#Integral_example
"""
mf.setup("test2.csv")
mf.maxflow()
self.assertEquals(mf.final_flow(), 2000)
def test1_one_flow(self):
mf.setup("test1.csv")
mf.maxflow(flow_max_iterations=1)
mf.final_flow()
mf.db.execute("SELECT id FROM flow WHERE flow > 0;")
flows = mf.db.fetchall()
self.assertEquals(len(flows), 2)
self.assertIn((1,), flows)
self.assertIn((4,), flows)
def test4_max_flow_edges(self):
mf.setup("test4.csv")
mf.maxflow()
mf.final_flow()
mf.db.execute("SELECT flow FROM flow " "WHERE src = 7 AND dst = 8;")
capacity1 = int(mf.db.fetchone()[0])
self.assertEquals(capacity1, 10)
mf.db.execute("SELECT flow FROM flow " "WHERE src = 4 AND dst = 8;")
capacity2 = int(mf.db.fetchone()[0])
self.assertEquals(capacity2, 10)
def test1_edge_flows(self):
mf.setup("test1.csv")
mf.maxflow()
mf.final_flow()
mf.db.execute("SELECT flow FROM flow ORDER BY id;")
assigned_flows = mf.db.fetchall()
expected_flows = [1, 1, 0, 1, 1]
for i, f in enumerate(expected_flows):
expected = assigned_flows[i][0]
self.assertEquals(f, expected,
"Flow {}: expected:{} found:{}".format(i, f, expected))
def test4_max_flow_edges(self):
mf.setup("test4.csv")
mf.maxflow()
mf.final_flow()
mf.db.execute("SELECT flow FROM flow "
"WHERE src = 7 AND dst = 8;")
capacity1 = int(mf.db.fetchone()[0])
self.assertEquals(capacity1, 10)
mf.db.execute("SELECT flow FROM flow "
"WHERE src = 4 AND dst = 8;")
capacity2 = int(mf.db.fetchone()[0])
self.assertEquals(capacity2, 10)
def test1_computed_flow(self):
mf.setup("test1.csv")
mf.maxflow()
self.assertEquals(mf.final_flow(), 2)
def test4_total_flow(self):
mf.setup("test4.csv")
mf.maxflow()
self.assertEquals(mf.final_flow(), 20)
def test4_total_flow(self):
mf.setup("test4.csv")
mf.maxflow()
self.assertEquals(mf.final_flow(), 20)
def test1_capacity_in_residual_graph(self):
mf.setup("test1.csv")
mf.maxflow()
mf.db.execute("SELECT capacity FROM edge, flip_edge WHERE id=reverse_id AND forward_id=1")
residual_flow = mf.db.fetchone()[0]
self.assertEquals(residual_flow, 1)