Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/connectivity/tests/test_stoer_wagner.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 from itertools import chain |
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2 import networkx as nx |
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3 import pytest |
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4 |
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5 |
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6 def _check_partition(G, cut_value, partition, weight): |
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7 assert isinstance(partition, tuple) |
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8 assert len(partition) == 2 |
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9 assert isinstance(partition[0], list) |
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10 assert isinstance(partition[1], list) |
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11 assert len(partition[0]) > 0 |
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12 assert len(partition[1]) > 0 |
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13 assert sum(map(len, partition)) == len(G) |
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14 assert set(chain.from_iterable(partition)) == set(G) |
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15 partition = tuple(map(set, partition)) |
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16 w = 0 |
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17 for u, v, e in G.edges(data=True): |
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18 if (u in partition[0]) == (v in partition[1]): |
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19 w += e.get(weight, 1) |
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20 assert w == cut_value |
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21 |
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22 |
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23 def _test_stoer_wagner(G, answer, weight="weight"): |
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24 cut_value, partition = nx.stoer_wagner(G, weight, heap=nx.utils.PairingHeap) |
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25 assert cut_value == answer |
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26 _check_partition(G, cut_value, partition, weight) |
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27 cut_value, partition = nx.stoer_wagner(G, weight, heap=nx.utils.BinaryHeap) |
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28 assert cut_value == answer |
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29 _check_partition(G, cut_value, partition, weight) |
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30 |
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31 |
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32 def test_graph1(): |
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33 G = nx.Graph() |
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34 G.add_edge("x", "a", weight=3) |
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35 G.add_edge("x", "b", weight=1) |
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36 G.add_edge("a", "c", weight=3) |
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37 G.add_edge("b", "c", weight=5) |
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38 G.add_edge("b", "d", weight=4) |
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39 G.add_edge("d", "e", weight=2) |
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40 G.add_edge("c", "y", weight=2) |
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41 G.add_edge("e", "y", weight=3) |
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42 _test_stoer_wagner(G, 4) |
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43 |
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44 |
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45 def test_graph2(): |
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46 G = nx.Graph() |
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47 G.add_edge("x", "a") |
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48 G.add_edge("x", "b") |
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49 G.add_edge("a", "c") |
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50 G.add_edge("b", "c") |
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51 G.add_edge("b", "d") |
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52 G.add_edge("d", "e") |
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53 G.add_edge("c", "y") |
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54 G.add_edge("e", "y") |
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55 _test_stoer_wagner(G, 2) |
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56 |
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57 |
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58 def test_graph3(): |
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59 # Source: |
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60 # Stoer, M. and Wagner, F. (1997). "A simple min-cut algorithm". Journal of |
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61 # the ACM 44 (4), 585-591. |
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62 G = nx.Graph() |
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63 G.add_edge(1, 2, weight=2) |
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64 G.add_edge(1, 5, weight=3) |
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65 G.add_edge(2, 3, weight=3) |
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66 G.add_edge(2, 5, weight=2) |
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67 G.add_edge(2, 6, weight=2) |
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68 G.add_edge(3, 4, weight=4) |
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69 G.add_edge(3, 7, weight=2) |
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70 G.add_edge(4, 7, weight=2) |
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71 G.add_edge(4, 8, weight=2) |
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72 G.add_edge(5, 6, weight=3) |
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73 G.add_edge(6, 7, weight=1) |
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74 G.add_edge(7, 8, weight=3) |
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75 _test_stoer_wagner(G, 4) |
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76 |
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77 |
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78 def test_weight_name(): |
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79 G = nx.Graph() |
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80 G.add_edge(1, 2, weight=1, cost=8) |
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81 G.add_edge(1, 3, cost=2) |
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82 G.add_edge(2, 3, cost=4) |
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83 _test_stoer_wagner(G, 6, weight="cost") |
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84 |
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85 |
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86 def test_exceptions(): |
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87 G = nx.Graph() |
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88 pytest.raises(nx.NetworkXError, nx.stoer_wagner, G) |
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89 G.add_node(1) |
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90 pytest.raises(nx.NetworkXError, nx.stoer_wagner, G) |
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91 G.add_node(2) |
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92 pytest.raises(nx.NetworkXError, nx.stoer_wagner, G) |
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93 G.add_edge(1, 2, weight=-2) |
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94 pytest.raises(nx.NetworkXError, nx.stoer_wagner, G) |
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95 G = nx.DiGraph() |
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96 pytest.raises(nx.NetworkXNotImplemented, nx.stoer_wagner, G) |
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97 G = nx.MultiGraph() |
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98 pytest.raises(nx.NetworkXNotImplemented, nx.stoer_wagner, G) |
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99 G = nx.MultiDiGraph() |
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100 pytest.raises(nx.NetworkXNotImplemented, nx.stoer_wagner, G) |