Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/operators/all.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 """Operations on many graphs. |
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2 """ |
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3 from itertools import zip_longest |
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4 import networkx as nx |
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5 |
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6 __all__ = ["union_all", "compose_all", "disjoint_union_all", "intersection_all"] |
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7 |
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8 |
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9 def union_all(graphs, rename=(None,)): |
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10 """Returns the union of all graphs. |
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11 |
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12 The graphs must be disjoint, otherwise an exception is raised. |
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13 |
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14 Parameters |
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15 ---------- |
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16 graphs : list of graphs |
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17 List of NetworkX graphs |
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18 |
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19 rename : bool , default=(None, None) |
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20 Node names of G and H can be changed by specifying the tuple |
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21 rename=('G-','H-') (for example). Node "u" in G is then renamed |
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22 "G-u" and "v" in H is renamed "H-v". |
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23 |
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24 Returns |
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25 ------- |
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26 U : a graph with the same type as the first graph in list |
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27 |
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28 Raises |
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29 ------ |
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30 ValueError |
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31 If `graphs` is an empty list. |
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32 |
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33 Notes |
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34 ----- |
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35 To force a disjoint union with node relabeling, use |
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36 disjoint_union_all(G,H) or convert_node_labels_to integers(). |
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37 |
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38 Graph, edge, and node attributes are propagated to the union graph. |
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39 If a graph attribute is present in multiple graphs, then the value |
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40 from the last graph in the list with that attribute is used. |
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41 |
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42 See Also |
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43 -------- |
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44 union |
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45 disjoint_union_all |
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46 """ |
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47 if not graphs: |
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48 raise ValueError("cannot apply union_all to an empty list") |
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49 graphs_names = zip_longest(graphs, rename) |
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50 U, gname = next(graphs_names) |
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51 for H, hname in graphs_names: |
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52 U = nx.union(U, H, (gname, hname)) |
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53 gname = None |
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54 return U |
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55 |
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56 |
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57 def disjoint_union_all(graphs): |
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58 """Returns the disjoint union of all graphs. |
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59 |
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60 This operation forces distinct integer node labels starting with 0 |
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61 for the first graph in the list and numbering consecutively. |
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62 |
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63 Parameters |
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64 ---------- |
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65 graphs : list |
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66 List of NetworkX graphs |
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67 |
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68 Returns |
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69 ------- |
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70 U : A graph with the same type as the first graph in list |
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71 |
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72 Raises |
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73 ------ |
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74 ValueError |
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75 If `graphs` is an empty list. |
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76 |
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77 Notes |
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78 ----- |
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79 It is recommended that the graphs be either all directed or all undirected. |
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80 |
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81 Graph, edge, and node attributes are propagated to the union graph. |
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82 If a graph attribute is present in multiple graphs, then the value |
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83 from the last graph in the list with that attribute is used. |
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84 """ |
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85 if not graphs: |
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86 raise ValueError("cannot apply disjoint_union_all to an empty list") |
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87 graphs = iter(graphs) |
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88 U = next(graphs) |
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89 for H in graphs: |
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90 U = nx.disjoint_union(U, H) |
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91 return U |
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92 |
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93 |
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94 def compose_all(graphs): |
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95 """Returns the composition of all graphs. |
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96 |
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97 Composition is the simple union of the node sets and edge sets. |
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98 The node sets of the supplied graphs need not be disjoint. |
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99 |
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100 Parameters |
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101 ---------- |
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102 graphs : list |
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103 List of NetworkX graphs |
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104 |
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105 Returns |
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106 ------- |
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107 C : A graph with the same type as the first graph in list |
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108 |
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109 Raises |
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110 ------ |
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111 ValueError |
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112 If `graphs` is an empty list. |
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113 |
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114 Notes |
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115 ----- |
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116 It is recommended that the supplied graphs be either all directed or all |
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117 undirected. |
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118 |
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119 Graph, edge, and node attributes are propagated to the union graph. |
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120 If a graph attribute is present in multiple graphs, then the value |
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121 from the last graph in the list with that attribute is used. |
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122 """ |
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123 if not graphs: |
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124 raise ValueError("cannot apply compose_all to an empty list") |
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125 graphs = iter(graphs) |
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126 C = next(graphs) |
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127 for H in graphs: |
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128 C = nx.compose(C, H) |
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129 return C |
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130 |
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131 |
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132 def intersection_all(graphs): |
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133 """Returns a new graph that contains only the edges that exist in |
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134 all graphs. |
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135 |
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136 All supplied graphs must have the same node set. |
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137 |
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138 Parameters |
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139 ---------- |
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140 graphs : list |
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141 List of NetworkX graphs |
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142 |
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143 Returns |
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144 ------- |
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145 R : A new graph with the same type as the first graph in list |
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146 |
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147 Raises |
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148 ------ |
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149 ValueError |
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150 If `graphs` is an empty list. |
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151 |
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152 Notes |
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153 ----- |
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154 Attributes from the graph, nodes, and edges are not copied to the new |
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155 graph. |
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156 """ |
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157 if not graphs: |
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158 raise ValueError("cannot apply intersection_all to an empty list") |
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159 graphs = iter(graphs) |
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160 R = next(graphs) |
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161 for H in graphs: |
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162 R = nx.intersection(R, H) |
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163 return R |