Hello,
I have a question about the Property maps returned by clustering.motif().
Practically, I have the following graph:
>>> pprint(rlf)
<Graph object, directed, with 22312 vertices and 44849 edges at 0x1007a3650>
In this graph, vertex and edge have some properties. For example :
>>> rlf.vertex_properties
{'status': <PropertyMap object with key type 'Vertex' and value type 'string', for Graph 0x1007a3650, at 0x1007a36d0>, '_graphml_vertex_id': <PropertyMap object with key type 'Vertex' and value type 'string', for Graph 0x1007a3650, at 0x101057c10>, 'name': <PropertyMap object with key type 'Vertex' and value type 'string', for Graph 0x1007a3650, at 0x1007ac750>}
Note that this graph occupies the memory space 0x1007a3650.
I've asked to graph-tool the motifs of this graph, with the following instruction:
>>> motifs, counts, vertex_maps = gt.clustering.motifs(gt.GraphView(rlf, directed=False), 4, return_maps=True)
So far, so good. This instruction returned me 3 variables. The first one is a list of graphs (motifs), the second one a list of numbers of counts, but the third is a bit mysterious for me.
So, it's a list of list of Property maps and it's ok that every one of this map correspond with a count of motif. However, I expected that this property maps refer to my original graph, but it does not.
For example, if I'm looking for the first motif and the first map :
>>> pprint(motifs[0])
<Graph object, undirected, with 4 vertices and 3 edges at 0x1007778d0>
>>> case0 = vertex_maps[0]
>>> graph0 = case0[0]
>>> pprint(graph0)
<PropertyMap object with key type 'Vertex' and value type 'int32_t', for Graph 0x1007778d0, at 0x10a2db7d0>
The first PropertyMap object refer to the motif and not to my original graph. And here, I don't understand. For a motif which occurs 10 times in my graph, I obtain 10 property maps. If I use get_graph on this 10 maps, I obtain 10 identical graphs. What would be the value of returning the maps? I had hoped to obtain sub-graph with original vertex and edges properties.
Is it something that I didn't understand? Is it possible to obtain sub-graph with original vertex and edges properties by using clustering.motifs?
Best regards,
Sandrine