Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/components/tests/test_strongly_connected.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 import pytest |
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2 import networkx as nx |
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3 from networkx import NetworkXNotImplemented |
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4 |
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5 |
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6 class TestStronglyConnected: |
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7 @classmethod |
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8 def setup_class(cls): |
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9 cls.gc = [] |
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10 G = nx.DiGraph() |
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11 G.add_edges_from( |
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12 [ |
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13 (1, 2), |
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14 (2, 3), |
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15 (2, 8), |
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16 (3, 4), |
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18 (4, 5), |
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19 (5, 3), |
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20 (5, 6), |
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21 (7, 4), |
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22 (7, 6), |
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23 (8, 1), |
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24 (8, 7), |
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25 ] |
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26 ) |
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27 C = {frozenset([3, 4, 5, 7]), frozenset([1, 2, 8]), frozenset([6])} |
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28 cls.gc.append((G, C)) |
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29 |
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30 G = nx.DiGraph() |
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31 G.add_edges_from([(1, 2), (1, 3), (1, 4), (4, 2), (3, 4), (2, 3)]) |
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32 C = {frozenset([2, 3, 4]), frozenset([1])} |
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33 cls.gc.append((G, C)) |
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34 |
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35 G = nx.DiGraph() |
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36 G.add_edges_from([(1, 2), (2, 3), (3, 2), (2, 1)]) |
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37 C = {frozenset([1, 2, 3])} |
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38 cls.gc.append((G, C)) |
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39 |
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40 # Eppstein's tests |
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41 G = nx.DiGraph({0: [1], 1: [2, 3], 2: [4, 5], 3: [4, 5], 4: [6], 5: [], 6: []}) |
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42 C = { |
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43 frozenset([0]), |
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44 frozenset([1]), |
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45 frozenset([2]), |
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46 frozenset([3]), |
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47 frozenset([4]), |
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48 frozenset([5]), |
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49 frozenset([6]), |
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50 } |
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51 cls.gc.append((G, C)) |
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52 |
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53 G = nx.DiGraph({0: [1], 1: [2, 3, 4], 2: [0, 3], 3: [4], 4: [3]}) |
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54 C = {frozenset([0, 1, 2]), frozenset([3, 4])} |
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55 cls.gc.append((G, C)) |
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56 |
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57 def test_tarjan(self): |
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58 scc = nx.strongly_connected_components |
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59 for G, C in self.gc: |
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60 assert {frozenset(g) for g in scc(G)} == C |
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61 |
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62 def test_tarjan_recursive(self): |
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63 scc = nx.strongly_connected_components_recursive |
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64 for G, C in self.gc: |
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65 assert {frozenset(g) for g in scc(G)} == C |
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66 |
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67 def test_kosaraju(self): |
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68 scc = nx.kosaraju_strongly_connected_components |
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69 for G, C in self.gc: |
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70 assert {frozenset(g) for g in scc(G)} == C |
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71 |
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72 def test_number_strongly_connected_components(self): |
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73 ncc = nx.number_strongly_connected_components |
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74 for G, C in self.gc: |
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75 assert ncc(G) == len(C) |
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76 |
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77 def test_is_strongly_connected(self): |
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78 for G, C in self.gc: |
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79 if len(C) == 1: |
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80 assert nx.is_strongly_connected(G) |
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81 else: |
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82 assert not nx.is_strongly_connected(G) |
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83 |
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84 def test_contract_scc1(self): |
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85 G = nx.DiGraph() |
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86 G.add_edges_from( |
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87 [ |
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88 (1, 2), |
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89 (2, 3), |
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90 (2, 11), |
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91 (2, 12), |
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108 (12, 11), |
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110 ) |
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111 scc = list(nx.strongly_connected_components(G)) |
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112 cG = nx.condensation(G, scc) |
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113 # DAG |
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114 assert nx.is_directed_acyclic_graph(cG) |
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115 # nodes |
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116 assert sorted(cG.nodes()) == [0, 1, 2, 3] |
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117 # edges |
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118 mapping = {} |
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119 for i, component in enumerate(scc): |
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120 for n in component: |
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121 mapping[n] = i |
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122 edge = (mapping[2], mapping[3]) |
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123 assert cG.has_edge(*edge) |
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124 edge = (mapping[2], mapping[5]) |
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125 assert cG.has_edge(*edge) |
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126 edge = (mapping[3], mapping[5]) |
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127 assert cG.has_edge(*edge) |
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128 |
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129 def test_contract_scc_isolate(self): |
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130 # Bug found and fixed in [1687]. |
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131 G = nx.DiGraph() |
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132 G.add_edge(1, 2) |
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133 G.add_edge(2, 1) |
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134 scc = list(nx.strongly_connected_components(G)) |
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135 cG = nx.condensation(G, scc) |
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136 assert list(cG.nodes()) == [0] |
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137 assert list(cG.edges()) == [] |
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138 |
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139 def test_contract_scc_edge(self): |
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140 G = nx.DiGraph() |
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141 G.add_edge(1, 2) |
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142 G.add_edge(2, 1) |
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143 G.add_edge(2, 3) |
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144 G.add_edge(3, 4) |
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145 G.add_edge(4, 3) |
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146 scc = list(nx.strongly_connected_components(G)) |
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147 cG = nx.condensation(G, scc) |
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148 assert sorted(cG.nodes()) == [0, 1] |
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149 if 1 in scc[0]: |
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150 edge = (0, 1) |
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151 else: |
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152 edge = (1, 0) |
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153 assert list(cG.edges()) == [edge] |
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154 |
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155 def test_condensation_mapping_and_members(self): |
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156 G, C = self.gc[1] |
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157 C = sorted(C, key=len, reverse=True) |
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158 cG = nx.condensation(G) |
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159 mapping = cG.graph["mapping"] |
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160 assert all(n in G for n in mapping) |
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161 assert all(0 == cN for n, cN in mapping.items() if n in C[0]) |
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162 assert all(1 == cN for n, cN in mapping.items() if n in C[1]) |
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163 for n, d in cG.nodes(data=True): |
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164 assert set(C[n]) == cG.nodes[n]["members"] |
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165 |
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166 def test_null_graph(self): |
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167 G = nx.DiGraph() |
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168 assert list(nx.strongly_connected_components(G)) == [] |
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169 assert list(nx.kosaraju_strongly_connected_components(G)) == [] |
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170 assert list(nx.strongly_connected_components_recursive(G)) == [] |
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171 assert len(nx.condensation(G)) == 0 |
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172 pytest.raises( |
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173 nx.NetworkXPointlessConcept, nx.is_strongly_connected, nx.DiGraph() |
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174 ) |
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175 |
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176 def test_connected_raise(self): |
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177 G = nx.Graph() |
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178 pytest.raises(NetworkXNotImplemented, nx.strongly_connected_components, G) |
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179 pytest.raises( |
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180 NetworkXNotImplemented, nx.kosaraju_strongly_connected_components, G |
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181 ) |
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182 pytest.raises( |
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183 NetworkXNotImplemented, nx.strongly_connected_components_recursive, G |
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184 ) |
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185 pytest.raises(NetworkXNotImplemented, nx.is_strongly_connected, G) |
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186 pytest.raises( |
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187 nx.NetworkXPointlessConcept, nx.is_strongly_connected, nx.DiGraph() |
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188 ) |
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189 pytest.raises(NetworkXNotImplemented, nx.condensation, G) |
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190 |
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191 |
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192 # Commented out due to variability on Travis-CI hardware/operating systems |
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193 # def test_linear_time(self): |
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194 # # See Issue #2831 |
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195 # count = 100 # base case |
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196 # dg = nx.DiGraph() |
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197 # dg.add_nodes_from([0, 1]) |
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198 # for i in range(2, count): |
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199 # dg.add_node(i) |
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200 # dg.add_edge(i, 1) |
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201 # dg.add_edge(0, i) |
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202 # t = time.time() |
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203 # ret = tuple(nx.strongly_connected_components(dg)) |
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204 # dt = time.time() - t |
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205 # |
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206 # count = 200 |
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207 # dg = nx.DiGraph() |
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208 # dg.add_nodes_from([0, 1]) |
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209 # for i in range(2, count): |
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210 # dg.add_node(i) |
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211 # dg.add_edge(i, 1) |
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212 # dg.add_edge(0, i) |
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213 # t = time.time() |
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214 # ret = tuple(nx.strongly_connected_components(dg)) |
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215 # dt2 = time.time() - t |
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216 # assert_less(dt2, dt * 2.3) # should be 2 times longer for this graph |