Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/bipartite/tests/test_spectral_bipartivity.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 |
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3 import networkx as nx |
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4 from networkx.algorithms.bipartite import spectral_bipartivity as sb |
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5 from networkx.testing import almost_equal |
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6 |
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7 # Examples from Figure 1 |
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8 # E. Estrada and J. A. Rodríguez-Velázquez, "Spectral measures of |
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9 # bipartivity in complex networks", PhysRev E 72, 046105 (2005) |
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10 |
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11 |
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12 class TestSpectralBipartivity: |
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13 @classmethod |
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14 def setup_class(cls): |
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15 global scipy |
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16 scipy = pytest.importorskip("scipy") |
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17 |
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18 def test_star_like(self): |
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19 # star-like |
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20 |
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21 G = nx.star_graph(2) |
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22 G.add_edge(1, 2) |
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23 assert almost_equal(sb(G), 0.843, places=3) |
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24 |
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25 G = nx.star_graph(3) |
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26 G.add_edge(1, 2) |
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27 assert almost_equal(sb(G), 0.871, places=3) |
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28 |
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29 G = nx.star_graph(4) |
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30 G.add_edge(1, 2) |
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31 assert almost_equal(sb(G), 0.890, places=3) |
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32 |
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33 def test_k23_like(self): |
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34 # K2,3-like |
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35 G = nx.complete_bipartite_graph(2, 3) |
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36 G.add_edge(0, 1) |
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37 assert almost_equal(sb(G), 0.769, places=3) |
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38 |
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39 G = nx.complete_bipartite_graph(2, 3) |
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40 G.add_edge(2, 4) |
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41 assert almost_equal(sb(G), 0.829, places=3) |
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42 |
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43 G = nx.complete_bipartite_graph(2, 3) |
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44 G.add_edge(2, 4) |
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45 G.add_edge(3, 4) |
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46 assert almost_equal(sb(G), 0.731, places=3) |
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47 |
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48 G = nx.complete_bipartite_graph(2, 3) |
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49 G.add_edge(0, 1) |
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50 G.add_edge(2, 4) |
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51 assert almost_equal(sb(G), 0.692, places=3) |
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52 |
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53 G = nx.complete_bipartite_graph(2, 3) |
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54 G.add_edge(2, 4) |
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55 G.add_edge(3, 4) |
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56 G.add_edge(0, 1) |
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57 assert almost_equal(sb(G), 0.645, places=3) |
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58 |
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59 G = nx.complete_bipartite_graph(2, 3) |
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60 G.add_edge(2, 4) |
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61 G.add_edge(3, 4) |
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62 G.add_edge(2, 3) |
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63 assert almost_equal(sb(G), 0.645, places=3) |
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64 |
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65 G = nx.complete_bipartite_graph(2, 3) |
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66 G.add_edge(2, 4) |
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67 G.add_edge(3, 4) |
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68 G.add_edge(2, 3) |
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69 G.add_edge(0, 1) |
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70 assert almost_equal(sb(G), 0.597, places=3) |
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71 |
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72 def test_single_nodes(self): |
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73 |
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74 # single nodes |
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75 G = nx.complete_bipartite_graph(2, 3) |
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76 G.add_edge(2, 4) |
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77 sbn = sb(G, nodes=[1, 2]) |
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78 assert almost_equal(sbn[1], 0.85, places=2) |
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79 assert almost_equal(sbn[2], 0.77, places=2) |
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80 |
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81 G = nx.complete_bipartite_graph(2, 3) |
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82 G.add_edge(0, 1) |
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83 sbn = sb(G, nodes=[1, 2]) |
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84 assert almost_equal(sbn[1], 0.73, places=2) |
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85 assert almost_equal(sbn[2], 0.82, places=2) |