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python/nx-cugraph/nx_cugraph/algorithms/bipartite/basic.py
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# Copyright (c) 2024, NVIDIA CORPORATION. | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
import cupy as cp | ||
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from nx_cugraph.algorithms.cluster import _triangles | ||
from nx_cugraph.convert import _to_graph | ||
from nx_cugraph.utils import networkx_algorithm | ||
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__all__ = [ | ||
"is_bipartite", | ||
] | ||
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@networkx_algorithm(plc="triangle_count", version_added="24.02") | ||
def is_bipartite(G): | ||
G = _to_graph(G) | ||
# Counting triangles may not be the fastest way to do this, but it is simple. | ||
node_ids, triangles, is_single_node = _triangles( | ||
G, None, symmetrize="union" if G.is_directed() else None | ||
) | ||
return int(cp.count_nonzero(triangles)) == 0 |
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# Copyright (c) 2024, NVIDIA CORPORATION. | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
import cupy as cp | ||
import pylibcugraph as plc | ||
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from nx_cugraph.convert import _to_undirected_graph | ||
from nx_cugraph.utils import networkx_algorithm, not_implemented_for | ||
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__all__ = [ | ||
"triangles", | ||
"average_clustering", | ||
"clustering", | ||
"transitivity", | ||
] | ||
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def _triangles(G, nodes, symmetrize=None): | ||
if nodes is not None: | ||
if is_single_node := (nodes in G): | ||
nodes = [nodes if G.key_to_id is None else G.key_to_id[nodes]] | ||
else: | ||
nodes = list(nodes) | ||
nodes = G._list_to_nodearray(nodes) | ||
else: | ||
is_single_node = False | ||
if len(G) == 0: | ||
return None, None, is_single_node | ||
node_ids, triangles = plc.triangle_count( | ||
resource_handle=plc.ResourceHandle(), | ||
graph=G._get_plc_graph(symmetrize=symmetrize), | ||
start_list=nodes, | ||
do_expensive_check=False, | ||
) | ||
return node_ids, triangles, is_single_node | ||
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@not_implemented_for("directed") | ||
@networkx_algorithm(plc="triangle_count", version_added="24.02") | ||
def triangles(G, nodes=None): | ||
G = _to_undirected_graph(G) | ||
node_ids, triangles, is_single_node = _triangles(G, nodes) | ||
if len(G) == 0: | ||
return {} | ||
if is_single_node: | ||
return int(triangles[0]) | ||
return G._nodearrays_to_dict(node_ids, triangles) | ||
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@not_implemented_for("directed") | ||
@networkx_algorithm(is_incomplete=True, plc="triangle_count", version_added="24.02") | ||
def clustering(G, nodes=None, weight=None): | ||
"""Directed graphs and `weight` parameter are not yet supported.""" | ||
G = _to_undirected_graph(G) | ||
node_ids, triangles, is_single_node = _triangles(G, nodes) | ||
if len(G) == 0: | ||
return {} | ||
if is_single_node: | ||
numer = int(triangles[0]) | ||
if numer == 0: | ||
return 0 | ||
degree = int((G.src_indices == nodes).sum()) | ||
return 2 * numer / (degree * (degree - 1)) | ||
degrees = G._degrees_array(ignore_selfloops=True)[node_ids] | ||
denom = degrees * (degrees - 1) | ||
results = 2 * triangles / denom | ||
results = cp.where(denom, results, 0) # 0 where we divided by 0 | ||
return G._nodearrays_to_dict(node_ids, results) | ||
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@clustering._can_run | ||
def _(G, nodes=None, weight=None): | ||
return weight is None and not G.is_directed() | ||
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@not_implemented_for("directed") | ||
@networkx_algorithm(is_incomplete=True, plc="triangle_count", version_added="24.02") | ||
def average_clustering(G, nodes=None, weight=None, count_zeros=True): | ||
"""Directed graphs and `weight` parameter are not yet supported.""" | ||
G = _to_undirected_graph(G) | ||
node_ids, triangles, is_single_node = _triangles(G, nodes) | ||
if len(G) == 0: | ||
raise ZeroDivisionError | ||
degrees = G._degrees_array(ignore_selfloops=True)[node_ids] | ||
if not count_zeros: | ||
mask = triangles != 0 | ||
triangles = triangles[mask] | ||
if triangles.size == 0: | ||
raise ZeroDivisionError | ||
degrees = degrees[mask] | ||
denom = degrees * (degrees - 1) | ||
results = 2 * triangles / denom | ||
if count_zeros: | ||
results = cp.where(denom, results, 0) # 0 where we divided by 0 | ||
return float(results.mean()) | ||
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@average_clustering._can_run | ||
def _(G, nodes=None, weight=None, count_zeros=True): | ||
return weight is None and not G.is_directed() | ||
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@not_implemented_for("directed") | ||
@networkx_algorithm(is_incomplete=True, plc="triangle_count", version_added="24.02") | ||
def transitivity(G): | ||
"""Directed graphs are not yet supported.""" | ||
G = _to_undirected_graph(G) | ||
if len(G) == 0: | ||
return 0 | ||
node_ids, triangles = plc.triangle_count( | ||
resource_handle=plc.ResourceHandle(), | ||
graph=G._get_plc_graph(), | ||
start_list=None, | ||
do_expensive_check=False, | ||
) | ||
numer = int(triangles.sum()) | ||
if numer == 0: | ||
return 0 | ||
degrees = G._degrees_array(ignore_selfloops=True)[node_ids] | ||
denom = int((degrees * (degrees - 1)).sum()) | ||
return 2 * numer / denom | ||
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@transitivity._can_run | ||
def _(G): | ||
# Is transitivity supposed to work on directed graphs? | ||
return not G.is_directed() |
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# Copyright (c) 2024, NVIDIA CORPORATION. | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
import networkx as nx | ||
import pytest | ||
from packaging.version import parse | ||
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nxver = parse(nx.__version__) | ||
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if nxver.major == 3 and nxver.minor < 2: | ||
pytest.skip("Need NetworkX >=3.2 to test clustering", allow_module_level=True) | ||
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def test_selfloops(): | ||
G = nx.complete_graph(5) | ||
H = nx.complete_graph(5) | ||
H.add_edge(0, 0) | ||
H.add_edge(1, 1) | ||
H.add_edge(2, 2) | ||
# triangles | ||
expected = nx.triangles(G) | ||
assert expected == nx.triangles(H) | ||
assert expected == nx.triangles(G, backend="cugraph") | ||
assert expected == nx.triangles(H, backend="cugraph") | ||
# average_clustering | ||
expected = nx.average_clustering(G) | ||
assert expected == nx.average_clustering(H) | ||
assert expected == nx.average_clustering(G, backend="cugraph") | ||
assert expected == nx.average_clustering(H, backend="cugraph") | ||
# clustering | ||
expected = nx.clustering(G) | ||
assert expected == nx.clustering(H) | ||
assert expected == nx.clustering(G, backend="cugraph") | ||
assert expected == nx.clustering(H, backend="cugraph") | ||
# transitivity | ||
expected = nx.transitivity(G) | ||
assert expected == nx.transitivity(H) | ||
assert expected == nx.transitivity(G, backend="cugraph") | ||
assert expected == nx.transitivity(H, backend="cugraph") |