Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/generators/tests/test_atlas.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 groupby |
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2 |
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3 import pytest |
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4 |
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5 import networkx as nx |
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6 from networkx.testing import assert_edges_equal, assert_nodes_equal |
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7 from networkx import graph_atlas |
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8 from networkx import graph_atlas_g |
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9 from networkx.generators.atlas import NUM_GRAPHS |
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10 from networkx.utils import pairwise |
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11 |
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12 |
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13 class TestAtlasGraph: |
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14 """Unit tests for the :func:`~networkx.graph_atlas` function.""" |
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15 |
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16 def test_index_too_small(self): |
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17 with pytest.raises(ValueError): |
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18 graph_atlas(-1) |
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19 |
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20 def test_index_too_large(self): |
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21 with pytest.raises(ValueError): |
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22 graph_atlas(NUM_GRAPHS) |
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23 |
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24 def test_graph(self): |
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25 G = graph_atlas(6) |
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26 assert_nodes_equal(G.nodes(), range(3)) |
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27 assert_edges_equal(G.edges(), [(0, 1), (0, 2)]) |
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28 |
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29 |
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30 class TestAtlasGraphG: |
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31 """Unit tests for the :func:`~networkx.graph_atlas_g` function.""" |
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32 |
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33 @classmethod |
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34 def setup_class(cls): |
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35 cls.GAG = graph_atlas_g() |
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36 |
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37 def test_sizes(self): |
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38 G = self.GAG[0] |
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39 assert G.number_of_nodes() == 0 |
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40 assert G.number_of_edges() == 0 |
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41 |
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42 G = self.GAG[7] |
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43 assert G.number_of_nodes() == 3 |
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44 assert G.number_of_edges() == 3 |
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45 |
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46 def test_names(self): |
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47 for i, G in enumerate(self.GAG): |
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48 assert int(G.name[1:]) == i |
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49 |
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50 def test_nondecreasing_nodes(self): |
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51 # check for nondecreasing number of nodes |
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52 for n1, n2 in pairwise(map(len, self.GAG)): |
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53 assert n2 <= n1 + 1 |
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54 |
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55 def test_nondecreasing_edges(self): |
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56 # check for nondecreasing number of edges (for fixed number of |
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57 # nodes) |
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58 for n, group in groupby(self.GAG, key=nx.number_of_nodes): |
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59 for m1, m2 in pairwise(map(nx.number_of_edges, group)): |
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60 assert m2 <= m1 + 1 |
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61 |
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62 def test_nondecreasing_degree_sequence(self): |
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63 # Check for lexicographically nondecreasing degree sequences |
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64 # (for fixed number of nodes and edges). |
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65 # |
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66 # There are three exceptions to this rule in the order given in |
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67 # the "Atlas of Graphs" book, so we need to manually exclude |
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68 # those. |
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69 exceptions = [("G55", "G56"), ("G1007", "G1008"), ("G1012", "G1013")] |
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70 for n, group in groupby(self.GAG, key=nx.number_of_nodes): |
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71 for m, group in groupby(group, key=nx.number_of_edges): |
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72 for G1, G2 in pairwise(group): |
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73 if (G1.name, G2.name) in exceptions: |
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74 continue |
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75 d1 = sorted(d for v, d in G1.degree()) |
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76 d2 = sorted(d for v, d in G2.degree()) |
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77 assert d1 <= d2 |