Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/tests/test_mis.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """ |
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2 Tests for maximal (not maximum) independent sets. |
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3 |
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4 """ |
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5 |
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6 import pytest |
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7 import networkx as nx |
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8 import random |
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9 |
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10 |
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11 class TestMaximalIndependantSet: |
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12 def setup(self): |
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13 self.florentine = nx.Graph() |
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14 self.florentine.add_edge("Acciaiuoli", "Medici") |
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15 self.florentine.add_edge("Castellani", "Peruzzi") |
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16 self.florentine.add_edge("Castellani", "Strozzi") |
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17 self.florentine.add_edge("Castellani", "Barbadori") |
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18 self.florentine.add_edge("Medici", "Barbadori") |
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19 self.florentine.add_edge("Medici", "Ridolfi") |
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20 self.florentine.add_edge("Medici", "Tornabuoni") |
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21 self.florentine.add_edge("Medici", "Albizzi") |
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22 self.florentine.add_edge("Medici", "Salviati") |
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23 self.florentine.add_edge("Salviati", "Pazzi") |
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24 self.florentine.add_edge("Peruzzi", "Strozzi") |
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25 self.florentine.add_edge("Peruzzi", "Bischeri") |
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26 self.florentine.add_edge("Strozzi", "Ridolfi") |
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27 self.florentine.add_edge("Strozzi", "Bischeri") |
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28 self.florentine.add_edge("Ridolfi", "Tornabuoni") |
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29 self.florentine.add_edge("Tornabuoni", "Guadagni") |
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30 self.florentine.add_edge("Albizzi", "Ginori") |
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31 self.florentine.add_edge("Albizzi", "Guadagni") |
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32 self.florentine.add_edge("Bischeri", "Guadagni") |
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33 self.florentine.add_edge("Guadagni", "Lamberteschi") |
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34 |
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35 def test_random_seed(self): |
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36 G = nx.complete_graph(5) |
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37 for node in G: |
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38 assert nx.maximal_independent_set(G, [node], seed=1) == [node] |
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39 |
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40 def test_K5(self): |
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41 """Maximal independent set: K5""" |
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42 G = nx.complete_graph(5) |
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43 for node in G: |
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44 assert nx.maximal_independent_set(G, [node]) == [node] |
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45 |
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46 def test_K55(self): |
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47 """Maximal independent set: K55""" |
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48 G = nx.complete_graph(55) |
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49 for node in G: |
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50 assert nx.maximal_independent_set(G, [node]) == [node] |
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51 |
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52 def test_exception(self): |
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53 """Bad input should raise exception.""" |
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54 G = self.florentine |
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55 pytest.raises(nx.NetworkXUnfeasible, nx.maximal_independent_set, G, ["Smith"]) |
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56 pytest.raises( |
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57 nx.NetworkXUnfeasible, nx.maximal_independent_set, G, ["Salviati", "Pazzi"] |
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58 ) |
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59 |
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60 def test_digraph_exception(self): |
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61 G = nx.DiGraph([(1, 2), (3, 4)]) |
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62 pytest.raises(nx.NetworkXNotImplemented, nx.maximal_independent_set, G) |
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63 |
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64 def test_florentine_family(self): |
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65 G = self.florentine |
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66 indep = nx.maximal_independent_set(G, ["Medici", "Bischeri"]) |
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67 assert sorted(indep) == sorted( |
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68 ["Medici", "Bischeri", "Castellani", "Pazzi", "Ginori", "Lamberteschi"] |
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69 ) |
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70 |
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71 def test_bipartite(self): |
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72 G = nx.complete_bipartite_graph(12, 34) |
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73 indep = nx.maximal_independent_set(G, [4, 5, 9, 10]) |
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74 assert sorted(indep) == list(range(12)) |
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75 |
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76 def test_random_graphs(self): |
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77 """Generate 50 random graphs of different types and sizes and |
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78 make sure that all sets are independent and maximal.""" |
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79 for i in range(0, 50, 10): |
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80 G = nx.random_graphs.erdos_renyi_graph(i * 10 + 1, random.random()) |
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81 IS = nx.maximal_independent_set(G) |
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82 assert not list(G.subgraph(IS).edges()) |
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83 neighbors_of_MIS = set.union(*(set(G.neighbors(v)) for v in IS)) |
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84 for v in set(G.nodes()).difference(IS): |
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85 assert v in neighbors_of_MIS |