Hello, Tiago!
A small example to reproduce the problem please find as the following.
import multiprocess as mp
import graph_tool.all as gt
import numpy as np
g = gt.price_network(20, m = 2, directed = False)
valid_paths = g.new_vertex_property("object")
g.vertex_properties["valid_paths"] = valid_paths
Cloudlet = []
Gateway = []
for v in g.vertices():
if np.random.rand() > 0.5:
Cloudlet.append(v)
else:
Gateway.append(v)
pool = mp.Pool(processes=4)
for v in Gateway:
valid_paths[v] = pool.map(lambda x: gt.all_shortest_paths(g = g, source
= g.vertex_index[v], target = x),[g.vertex_index[c] for c in Cloudlet])
The version of my graph-tool is 2.25. Now, the python compiler says
MaybeEncodingError: Error sending result:
'[<graph_tool.libgraph_tool_core.CoroGenerator object at 0x7f344b5f4f80>]'.
Reason: 'RuntimeError('Pickling of
"graph_tool.libgraph_tool_core.CoroGenerator" instances is not enabled
(http://www.boost.org/libs/python/doc/v2/pickle.html)',)'
I know vertex objects cannot be picked. However, I think I have converted
vertex objects into a int list before sending them to map function, i.e.,
"[g.vertex_index[c] for c in Cloudlet]". In particular, we can print
[g.vertex_index[c] for c in Cloudlet], and terminal shows something like
[1,2,3,4,5].
Is there any thing I misunderstand ?
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