59 lines
1.6 KiB
Python
59 lines
1.6 KiB
Python
|
# -*- encoding: utf-8 -*-
|
|||
|
# test_kernighan_lin.py - unit tests for Kernighan–Lin bipartition algorithm
|
|||
|
#
|
|||
|
# Copyright 2011 Ben Edwards <bedwards@cs.unm.edu>.
|
|||
|
# Copyright 2011 Aric Hagberg <hagberg@lanl.gov>.
|
|||
|
# Copyright 2015 NetworkX developers.
|
|||
|
#
|
|||
|
# This file is part of NetworkX.
|
|||
|
#
|
|||
|
# NetworkX is distributed under a BSD license; see LICENSE.txt for more
|
|||
|
# information.
|
|||
|
"""Unit tests for the :mod:`networkx.algorithms.community.kernighan_lin`
|
|||
|
module.
|
|||
|
|
|||
|
"""
|
|||
|
import pytest
|
|||
|
|
|||
|
import networkx as nx
|
|||
|
from networkx.algorithms.community import kernighan_lin_bisection
|
|||
|
|
|||
|
|
|||
|
def assert_partition_equal(x, y):
|
|||
|
assert set(map(frozenset, x)) == set(map(frozenset, y))
|
|||
|
|
|||
|
|
|||
|
def test_partition():
|
|||
|
G = nx.barbell_graph(3, 0)
|
|||
|
C = kernighan_lin_bisection(G)
|
|||
|
assert_partition_equal(C, [{0, 1, 2}, {3, 4, 5}])
|
|||
|
|
|||
|
|
|||
|
def test_seed_argument():
|
|||
|
G = nx.barbell_graph(3, 0)
|
|||
|
C = kernighan_lin_bisection(G, seed=1)
|
|||
|
assert_partition_equal(C, [{0, 1, 2}, {3, 4, 5}])
|
|||
|
|
|||
|
|
|||
|
def test_non_disjoint_partition():
|
|||
|
with pytest.raises(nx.NetworkXError):
|
|||
|
G = nx.barbell_graph(3, 0)
|
|||
|
partition = ({0, 1, 2}, {2, 3, 4, 5})
|
|||
|
kernighan_lin_bisection(G, partition)
|
|||
|
|
|||
|
|
|||
|
def test_too_many_blocks():
|
|||
|
with pytest.raises(nx.NetworkXError):
|
|||
|
G = nx.barbell_graph(3, 0)
|
|||
|
partition = ({0, 1}, {2}, {3, 4, 5})
|
|||
|
kernighan_lin_bisection(G, partition)
|
|||
|
|
|||
|
|
|||
|
def test_multigraph():
|
|||
|
G = nx.cycle_graph(4)
|
|||
|
M = nx.MultiGraph(G.edges())
|
|||
|
M.add_edges_from(G.edges())
|
|||
|
M.remove_edge(1, 2)
|
|||
|
A, B = kernighan_lin_bisection(M)
|
|||
|
assert_partition_equal([A, B], [{0, 1}, {2, 3}])
|