I use graph-tool to do some routing tasks over graphs ranging from 1M to
10M edges. To search shortest paths might be quite time consuming. Hence, I
wonder if it might be a good idea to try to implement Hierarchical
Contractions  in graph tool.
What is your opinion about it ?
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This sounds useful; I have nothing against implementing it. However,
time is always limited. If you want to help, you can open an issue for
it in the website, together with a link to the algorithm, existing
implementations, etc. This would help me getting around to it when time