Cannot convert networkx graph to igraph using ig.Graph.from_networkx #566
Description
Describe the bug
Code which used ig.Graph.from_networkx worked in 0.9.11 fails in 0.10.0
To reproduce
Steps or minimal example code to reproduce the problem.
Run the following code:
import networkx as nx
import igraph as ig
import numpy as np
coords = np.array(
[
[-7.25, 49.42],
[-7.99451822, 49.40710344],
[-8.73857413, 49.38941589],
[-9.48202378, 49.36694374],
[-10.22472414, 49.33969506],
[-10.96653322, 49.30767965],
[-11.70731035, 49.27090898],
[-12.44691629, 49.22939616],
[-13.18521351, 49.18315596],
[-13.92206632, 49.13220475],
[-14.65734104, 49.07656048],
]
)
speeds = np.ones((len(coords),))
bearings = np.ones_like(speeds)
G = nx.DiGraph()
G.add_edges_from(
(
(
(0, 0),
(1, 1),
{
"weight": float("inf"),
"coords": coords,
"speed": speeds,
"bearing": bearings,
"delta_time": 1,
},
),
(
(0, 0),
(1, 0),
{
"weight": float("inf"),
"coords": coords,
"speed": speeds,
"bearing": bearings,
"delta_time": 1,
},
),
(
(0, 0),
(1, -1),
{"weight": 1, "coords": coords, "speed": speeds, "bearing": bearings, "delta_time": 1},
),
(
(1, 1),
(2, 0),
{"weight": 1, "coords": coords, "speed": speeds, "bearing": bearings, "delta_time": 1},
),
(
(1, 0),
(2, 0),
{"weight": 1, "coords": coords, "speed": speeds, "bearing": bearings, "delta_time": 1},
),
(
(1, -1),
(2, 0),
{"weight": 1, "coords": coords, "speed": speeds, "bearing": bearings, "delta_time": 1},
),
(
(2, 0),
(3, 0),
{"weight": 3, "coords": coords, "speed": speeds, "bearing": bearings, "delta_time": 1},
),
)
)
igG = ig.Graph.from_networkx(G)And the following error occurs:
usr/local/lib/python3.10/dist-packages/BATWeatherRouting/Graph/graph_component.py:323: in __init__
igG = ig.Graph.from_networkx(G)
usr/local/lib/python3.10/dist-packages/igraph/io/libraries.py:101: in _construct_graph_from_networkx
if len(g) and "_igraph_index" in g.nodes[0]:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = NodeView(((0, 0), (1, 1), (1, 0), (1, -1), (2, 0), (3, 0))), n = 0
def __getitem__(self, n):
if isinstance(n, slice):
raise nx.NetworkXError(
f"{type(self).__name__} does not support slicing, "
f"try list(G.nodes)[{n.start}:{n.stop}:{n.step}]"
)
> return self._nodes[n]
E KeyError: 0
Version information
igraph==0.10.0
networkx==2.8.6
numpy==1.23.2