Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/community/tests/test_label_propagation.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 from itertools import chain |
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2 from itertools import combinations |
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3 |
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4 import pytest |
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5 |
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6 import networkx as nx |
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7 from networkx.algorithms.community import label_propagation_communities |
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8 from networkx.algorithms.community import asyn_lpa_communities |
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9 |
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10 |
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11 def test_directed_not_supported(): |
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12 with pytest.raises(nx.NetworkXNotImplemented): |
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13 # not supported for directed graphs |
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14 test = nx.DiGraph() |
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15 test.add_edge("a", "b") |
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16 test.add_edge("a", "c") |
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17 test.add_edge("b", "d") |
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18 result = label_propagation_communities(test) |
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19 |
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20 |
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21 def test_one_node(): |
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22 test = nx.Graph() |
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23 test.add_node("a") |
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24 |
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25 # The expected communities are: |
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26 ground_truth = {frozenset(["a"])} |
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27 |
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28 communities = label_propagation_communities(test) |
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29 result = {frozenset(c) for c in communities} |
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30 assert result == ground_truth |
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31 |
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32 |
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33 def test_unconnected_communities(): |
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34 test = nx.Graph() |
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35 # community 1 |
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36 test.add_edge("a", "c") |
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37 test.add_edge("a", "d") |
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38 test.add_edge("d", "c") |
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39 # community 2 |
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40 test.add_edge("b", "e") |
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41 test.add_edge("e", "f") |
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42 test.add_edge("f", "b") |
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43 |
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44 # The expected communities are: |
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45 ground_truth = {frozenset(["a", "c", "d"]), frozenset(["b", "e", "f"])} |
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46 |
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47 communities = label_propagation_communities(test) |
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48 result = {frozenset(c) for c in communities} |
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49 assert result == ground_truth |
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50 |
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51 |
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52 def test_connected_communities(): |
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53 test = nx.Graph() |
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54 # community 1 |
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55 test.add_edge("a", "b") |
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56 test.add_edge("c", "a") |
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57 test.add_edge("c", "b") |
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58 test.add_edge("d", "a") |
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59 test.add_edge("d", "b") |
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60 test.add_edge("d", "c") |
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61 test.add_edge("e", "a") |
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62 test.add_edge("e", "b") |
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63 test.add_edge("e", "c") |
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64 test.add_edge("e", "d") |
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65 # community 2 |
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66 test.add_edge("1", "2") |
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67 test.add_edge("3", "1") |
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68 test.add_edge("3", "2") |
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69 test.add_edge("4", "1") |
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70 test.add_edge("4", "2") |
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71 test.add_edge("4", "3") |
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72 test.add_edge("5", "1") |
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73 test.add_edge("5", "2") |
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74 test.add_edge("5", "3") |
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75 test.add_edge("5", "4") |
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76 # edge between community 1 and 2 |
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77 test.add_edge("a", "1") |
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78 # community 3 |
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79 test.add_edge("x", "y") |
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80 # community 4 with only a single node |
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81 test.add_node("z") |
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82 |
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83 # The expected communities are: |
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84 ground_truth1 = { |
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85 frozenset(["a", "b", "c", "d", "e"]), |
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86 frozenset(["1", "2", "3", "4", "5"]), |
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87 frozenset(["x", "y"]), |
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88 frozenset(["z"]), |
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89 } |
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90 ground_truth2 = { |
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91 frozenset(["a", "b", "c", "d", "e", "1", "2", "3", "4", "5"]), |
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92 frozenset(["x", "y"]), |
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93 frozenset(["z"]), |
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94 } |
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95 ground_truth = (ground_truth1, ground_truth2) |
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96 |
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97 communities = label_propagation_communities(test) |
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98 result = {frozenset(c) for c in communities} |
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99 assert result in ground_truth |
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100 |
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101 |
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102 def test_termination(): |
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103 # ensure termination of asyn_lpa_communities in two cases |
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104 # that led to an endless loop in a previous version |
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105 test1 = nx.karate_club_graph() |
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106 test2 = nx.caveman_graph(2, 10) |
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107 test2.add_edges_from([(0, 20), (20, 10)]) |
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108 asyn_lpa_communities(test1) |
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109 asyn_lpa_communities(test2) |
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110 |
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111 |
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112 class TestAsynLpaCommunities: |
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113 def _check_communities(self, G, expected): |
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114 """Checks that the communities computed from the given graph ``G`` |
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115 using the :func:`~networkx.asyn_lpa_communities` function match |
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116 the set of nodes given in ``expected``. |
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117 |
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118 ``expected`` must be a :class:`set` of :class:`frozenset` |
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119 instances, each element of which is a node in the graph. |
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120 |
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121 """ |
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122 communities = asyn_lpa_communities(G) |
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123 result = {frozenset(c) for c in communities} |
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124 assert result == expected |
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125 |
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126 def test_null_graph(self): |
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127 G = nx.null_graph() |
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128 ground_truth = set() |
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129 self._check_communities(G, ground_truth) |
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130 |
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131 def test_single_node(self): |
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132 G = nx.empty_graph(1) |
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133 ground_truth = {frozenset([0])} |
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134 self._check_communities(G, ground_truth) |
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135 |
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136 def test_simple_communities(self): |
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137 # This graph is the disjoint union of two triangles. |
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138 G = nx.Graph(["ab", "ac", "bc", "de", "df", "fe"]) |
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139 ground_truth = {frozenset("abc"), frozenset("def")} |
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140 self._check_communities(G, ground_truth) |
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141 |
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142 def test_seed_argument(self): |
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143 G = nx.Graph(["ab", "ac", "bc", "de", "df", "fe"]) |
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144 ground_truth = {frozenset("abc"), frozenset("def")} |
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145 communities = asyn_lpa_communities(G, seed=1) |
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146 result = {frozenset(c) for c in communities} |
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147 assert result == ground_truth |
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148 |
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149 def test_several_communities(self): |
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150 # This graph is the disjoint union of five triangles. |
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151 ground_truth = {frozenset(range(3 * i, 3 * (i + 1))) for i in range(5)} |
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152 edges = chain.from_iterable(combinations(c, 2) for c in ground_truth) |
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153 G = nx.Graph(edges) |
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154 self._check_communities(G, ground_truth) |