Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/centrality/tests/test_second_order_centrality.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 """ |
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2 Tests for second order centrality. |
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3 """ |
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4 |
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5 import pytest |
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6 |
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7 np = pytest.importorskip("numpy") |
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8 scipy = pytest.importorskip("scipy") |
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9 |
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10 import networkx as nx |
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11 from networkx.testing import almost_equal |
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12 |
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13 |
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14 class TestSecondOrderCentrality: |
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15 def test_empty(self): |
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16 with pytest.raises(nx.NetworkXException): |
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17 G = nx.empty_graph() |
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18 nx.second_order_centrality(G) |
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19 |
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20 def test_non_connected(self): |
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21 with pytest.raises(nx.NetworkXException): |
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22 G = nx.Graph() |
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23 G.add_node(0) |
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24 G.add_node(1) |
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25 nx.second_order_centrality(G) |
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26 |
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27 def test_non_negative_edge_weights(self): |
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28 with pytest.raises(nx.NetworkXException): |
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29 G = nx.path_graph(2) |
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30 G.add_edge(0, 1, weight=-1) |
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31 nx.second_order_centrality(G) |
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32 |
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33 def test_one_node_graph(self): |
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34 """Second order centrality: single node""" |
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35 G = nx.Graph() |
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36 G.add_node(0) |
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37 G.add_edge(0, 0) |
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38 assert nx.second_order_centrality(G)[0] == 0 |
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39 |
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40 def test_P3(self): |
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41 """Second order centrality: line graph, as defined in paper""" |
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42 G = nx.path_graph(3) |
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43 b_answer = {0: 3.741, 1: 1.414, 2: 3.741} |
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44 |
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45 b = nx.second_order_centrality(G) |
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46 |
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47 for n in sorted(G): |
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48 assert almost_equal(b[n], b_answer[n], places=2) |
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49 |
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50 def test_K3(self): |
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51 """Second order centrality: complete graph, as defined in paper""" |
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52 G = nx.complete_graph(3) |
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53 b_answer = {0: 1.414, 1: 1.414, 2: 1.414} |
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54 |
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55 b = nx.second_order_centrality(G) |
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56 |
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57 for n in sorted(G): |
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58 assert almost_equal(b[n], b_answer[n], places=2) |
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59 |
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60 def test_ring_graph(self): |
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61 """Second order centrality: ring graph, as defined in paper""" |
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62 G = nx.cycle_graph(5) |
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63 b_answer = {0: 4.472, 1: 4.472, 2: 4.472, 3: 4.472, 4: 4.472} |
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64 |
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65 b = nx.second_order_centrality(G) |
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66 |
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67 for n in sorted(G): |
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68 assert almost_equal(b[n], b_answer[n], places=2) |