two version of R2R are here HEAD master

1 files changed, 264 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/networkx/algorithms/community/tests/test_louvain.py b/.venv/lib/python3.12/site-packages/networkx/algorithms/community/tests/test_louvain.py
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+++ b/.venv/lib/python3.12/site-packages/networkx/algorithms/community/tests/test_louvain.py
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+import pytest
+
+import networkx as nx
+
+
+def test_modularity_increase():
+    G = nx.LFR_benchmark_graph(
+        250, 3, 1.5, 0.009, average_degree=5, min_community=20, seed=10
+    )
+    partition = [{u} for u in G.nodes()]
+    mod = nx.community.modularity(G, partition)
+    partition = nx.community.louvain_communities(G)
+
+    assert nx.community.modularity(G, partition) > mod
+
+
+def test_valid_partition():
+    G = nx.LFR_benchmark_graph(
+        250, 3, 1.5, 0.009, average_degree=5, min_community=20, seed=10
+    )
+    H = G.to_directed()
+    partition = nx.community.louvain_communities(G)
+    partition2 = nx.community.louvain_communities(H)
+
+    assert nx.community.is_partition(G, partition)
+    assert nx.community.is_partition(H, partition2)
+
+
+def test_karate_club_partition():
+    G = nx.karate_club_graph()
+    part = [
+        {0, 1, 2, 3, 7, 9, 11, 12, 13, 17, 19, 21},
+        {16, 4, 5, 6, 10},
+        {23, 25, 27, 28, 24, 31},
+        {32, 33, 8, 14, 15, 18, 20, 22, 26, 29, 30},
+    ]
+    partition = nx.community.louvain_communities(G, seed=2, weight=None)
+
+    assert part == partition
+
+
+def test_partition_iterator():
+    G = nx.path_graph(15)
+    parts_iter = nx.community.louvain_partitions(G, seed=42)
+    first_part = next(parts_iter)
+    first_copy = [s.copy() for s in first_part]
+
+    # gh-5901 reports sets changing after next partition is yielded
+    assert first_copy[0] == first_part[0]
+    second_part = next(parts_iter)
+    assert first_copy[0] == first_part[0]
+
+
+def test_undirected_selfloops():
+    G = nx.karate_club_graph()
+    expected_partition = nx.community.louvain_communities(G, seed=2, weight=None)
+    part = [
+        {0, 1, 2, 3, 7, 9, 11, 12, 13, 17, 19, 21},
+        {16, 4, 5, 6, 10},
+        {23, 25, 27, 28, 24, 31},
+        {32, 33, 8, 14, 15, 18, 20, 22, 26, 29, 30},
+    ]
+    assert expected_partition == part
+
+    G.add_weighted_edges_from([(i, i, i * 1000) for i in range(9)])
+    # large self-loop weight impacts partition
+    partition = nx.community.louvain_communities(G, seed=2, weight="weight")
+    assert part != partition
+
+    # small self-loop weights aren't enough to impact partition in this graph
+    partition = nx.community.louvain_communities(G, seed=2, weight=None)
+    assert part == partition
+
+
+def test_directed_selfloops():
+    G = nx.DiGraph()
+    G.add_nodes_from(range(11))
+    G_edges = [
+        (0, 2),
+        (0, 1),
+        (1, 0),
+        (2, 1),
+        (2, 0),
+        (3, 4),
+        (4, 3),
+        (7, 8),
+        (8, 7),
+        (9, 10),
+        (10, 9),
+    ]
+    G.add_edges_from(G_edges)
+    G_expected_partition = nx.community.louvain_communities(G, seed=123, weight=None)
+
+    G.add_weighted_edges_from([(i, i, i * 1000) for i in range(3)])
+    # large self-loop weight impacts partition
+    G_partition = nx.community.louvain_communities(G, seed=123, weight="weight")
+    assert G_partition != G_expected_partition
+
+    # small self-loop weights aren't enough to impact partition in this graph
+    G_partition = nx.community.louvain_communities(G, seed=123, weight=None)
+    assert G_partition == G_expected_partition
+
+
+def test_directed_partition():
+    """
+    Test 2 cases that were looping infinitely
+    from issues #5175 and #5704
+    """
+    G = nx.DiGraph()
+    H = nx.DiGraph()
+    G.add_nodes_from(range(10))
+    H.add_nodes_from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11])
+    G_edges = [
+        (0, 2),
+        (0, 1),
+        (1, 0),
+        (2, 1),
+        (2, 0),
+        (3, 4),
+        (4, 3),
+        (7, 8),
+        (8, 7),
+        (9, 10),
+        (10, 9),
+    ]
+    H_edges = [
+        (1, 2),
+        (1, 6),
+        (1, 9),
+        (2, 3),
+        (2, 4),
+        (2, 5),
+        (3, 4),
+        (4, 3),
+        (4, 5),
+        (5, 4),
+        (6, 7),
+        (6, 8),
+        (9, 10),
+        (9, 11),
+        (10, 11),
+        (11, 10),
+    ]
+    G.add_edges_from(G_edges)
+    H.add_edges_from(H_edges)
+
+    G_expected_partition = [{0, 1, 2}, {3, 4}, {5}, {6}, {8, 7}, {9, 10}]
+    G_partition = nx.community.louvain_communities(G, seed=123, weight=None)
+
+    H_expected_partition = [{2, 3, 4, 5}, {8, 1, 6, 7}, {9, 10, 11}]
+    H_partition = nx.community.louvain_communities(H, seed=123, weight=None)
+
+    assert G_partition == G_expected_partition
+    assert H_partition == H_expected_partition
+
+
+def test_none_weight_param():
+    G = nx.karate_club_graph()
+    nx.set_edge_attributes(
+        G, {edge: i * i for i, edge in enumerate(G.edges)}, name="foo"
+    )
+
+    part = [
+        {0, 1, 2, 3, 7, 9, 11, 12, 13, 17, 19, 21},
+        {16, 4, 5, 6, 10},
+        {23, 25, 27, 28, 24, 31},
+        {32, 33, 8, 14, 15, 18, 20, 22, 26, 29, 30},
+    ]
+    partition1 = nx.community.louvain_communities(G, weight=None, seed=2)
+    partition2 = nx.community.louvain_communities(G, weight="foo", seed=2)
+    partition3 = nx.community.louvain_communities(G, weight="weight", seed=2)
+
+    assert part == partition1
+    assert part != partition2
+    assert part != partition3
+    assert partition2 != partition3
+
+
+def test_quality():
+    G = nx.LFR_benchmark_graph(
+        250, 3, 1.5, 0.009, average_degree=5, min_community=20, seed=10
+    )
+    H = nx.gn_graph(200, seed=1234)
+    I = nx.MultiGraph(G)
+    J = nx.MultiDiGraph(H)
+
+    partition = nx.community.louvain_communities(G)
+    partition2 = nx.community.louvain_communities(H)
+    partition3 = nx.community.louvain_communities(I)
+    partition4 = nx.community.louvain_communities(J)
+
+    quality = nx.community.partition_quality(G, partition)[0]
+    quality2 = nx.community.partition_quality(H, partition2)[0]
+    quality3 = nx.community.partition_quality(I, partition3)[0]
+    quality4 = nx.community.partition_quality(J, partition4)[0]
+
+    assert quality >= 0.65
+    assert quality2 >= 0.65
+    assert quality3 >= 0.65
+    assert quality4 >= 0.65
+
+
+def test_multigraph():
+    G = nx.karate_club_graph()
+    H = nx.MultiGraph(G)
+    G.add_edge(0, 1, weight=10)
+    H.add_edge(0, 1, weight=9)
+    G.add_edge(0, 9, foo=20)
+    H.add_edge(0, 9, foo=20)
+
+    partition1 = nx.community.louvain_communities(G, seed=1234)
+    partition2 = nx.community.louvain_communities(H, seed=1234)
+    partition3 = nx.community.louvain_communities(H, weight="foo", seed=1234)
+
+    assert partition1 == partition2 != partition3
+
+
+def test_resolution():
+    G = nx.LFR_benchmark_graph(
+        250, 3, 1.5, 0.009, average_degree=5, min_community=20, seed=10
+    )
+
+    partition1 = nx.community.louvain_communities(G, resolution=0.5, seed=12)
+    partition2 = nx.community.louvain_communities(G, seed=12)
+    partition3 = nx.community.louvain_communities(G, resolution=2, seed=12)
+
+    assert len(partition1) <= len(partition2) <= len(partition3)
+
+
+def test_threshold():
+    G = nx.LFR_benchmark_graph(
+        250, 3, 1.5, 0.009, average_degree=5, min_community=20, seed=10
+    )
+    partition1 = nx.community.louvain_communities(G, threshold=0.3, seed=2)
+    partition2 = nx.community.louvain_communities(G, seed=2)
+    mod1 = nx.community.modularity(G, partition1)
+    mod2 = nx.community.modularity(G, partition2)
+
+    assert mod1 <= mod2
+
+
+def test_empty_graph():
+    G = nx.Graph()
+    G.add_nodes_from(range(5))
+    expected = [{0}, {1}, {2}, {3}, {4}]
+    assert nx.community.louvain_communities(G) == expected
+
+
+def test_max_level():
+    G = nx.LFR_benchmark_graph(
+        250, 3, 1.5, 0.009, average_degree=5, min_community=20, seed=10
+    )
+    parts_iter = nx.community.louvain_partitions(G, seed=42)
+    for max_level, expected in enumerate(parts_iter, 1):
+        partition = nx.community.louvain_communities(G, max_level=max_level, seed=42)
+        assert partition == expected
+    assert max_level > 1  # Ensure we are actually testing max_level
+    # max_level is an upper limit; it's okay if we stop before it's hit.
+    partition = nx.community.louvain_communities(G, max_level=max_level + 1, seed=42)
+    assert partition == expected
+    with pytest.raises(
+        ValueError, match="max_level argument must be a positive integer"
+    ):
+        nx.community.louvain_communities(G, max_level=0)