Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/generators/tests/test_nonisomorphic_trees.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 ==================== |
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3 Generators - Non Isomorphic Trees |
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4 ==================== |
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5 |
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6 Unit tests for WROM algorithm generator in generators/nonisomorphic_trees.py |
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7 """ |
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8 import networkx as nx |
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9 from networkx.testing import assert_edges_equal |
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10 |
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11 |
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12 class TestGeneratorNonIsomorphicTrees: |
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13 def test_tree_structure(self): |
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14 # test for tree structure for nx.nonisomorphic_trees() |
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15 def f(x): |
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16 return list(nx.nonisomorphic_trees(x)) |
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17 |
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18 for i in f(6): |
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19 assert nx.is_tree(i) |
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20 for i in f(8): |
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21 assert nx.is_tree(i) |
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22 |
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23 def test_nonisomorphism(self): |
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24 # test for nonisomorphism of trees for nx.nonisomorphic_trees() |
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25 def f(x): |
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26 return list(nx.nonisomorphic_trees(x)) |
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27 |
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28 trees = f(6) |
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29 for i in range(len(trees)): |
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30 for j in range(i + 1, len(trees)): |
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31 assert not nx.is_isomorphic(trees[i], trees[j]) |
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32 trees = f(8) |
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33 for i in range(len(trees)): |
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34 for j in range(i + 1, len(trees)): |
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35 assert not nx.is_isomorphic(trees[i], trees[j]) |
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36 |
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37 def test_number_of_nonisomorphic_trees(self): |
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38 # http://oeis.org/A000055 |
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39 assert nx.number_of_nonisomorphic_trees(2) == 1 |
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40 assert nx.number_of_nonisomorphic_trees(3) == 1 |
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41 assert nx.number_of_nonisomorphic_trees(4) == 2 |
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42 assert nx.number_of_nonisomorphic_trees(5) == 3 |
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43 assert nx.number_of_nonisomorphic_trees(6) == 6 |
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44 assert nx.number_of_nonisomorphic_trees(7) == 11 |
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45 assert nx.number_of_nonisomorphic_trees(8) == 23 |
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46 |
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47 def test_nonisomorphic_trees(self): |
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48 def f(x): |
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49 return list(nx.nonisomorphic_trees(x)) |
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50 |
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51 assert_edges_equal(f(3)[0].edges(), [(0, 1), (0, 2)]) |
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52 assert_edges_equal(f(4)[0].edges(), [(0, 1), (0, 3), (1, 2)]) |
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53 assert_edges_equal(f(4)[1].edges(), [(0, 1), (0, 2), (0, 3)]) |
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54 |
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55 def test_nonisomorphic_trees_matrix(self): |
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56 trees_2 = [[[0, 1], [1, 0]]] |
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57 assert list(nx.nonisomorphic_trees(2, create="matrix")) == trees_2 |
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58 trees_3 = [[[0, 1, 1], [1, 0, 0], [1, 0, 0]]] |
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59 assert list(nx.nonisomorphic_trees(3, create="matrix")) == trees_3 |
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60 trees_4 = [ |
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61 [[0, 1, 0, 1], [1, 0, 1, 0], [0, 1, 0, 0], [1, 0, 0, 0]], |
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62 [[0, 1, 1, 1], [1, 0, 0, 0], [1, 0, 0, 0], [1, 0, 0, 0]], |
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63 ] |
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64 assert list(nx.nonisomorphic_trees(4, create="matrix")) == trees_4 |