#13808: Gromov hyperbolicity of graphs
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Reporter: dcoudert | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.6
Component: graph theory | Resolution:
Keywords: graph, hyperbolicity | Work issues:
Report Upstream: N/A | Reviewers: Nathann Cohen
Authors: David Coudert | Merged in:
Dependencies: | Stopgaps:
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Old description:
> This patch implements algorithms for computing the Gromov hyperbolicity
> of a graph. Although the worst case time complexity is in `O(n^4)`, the
> proposed implementation performs quite well in practice. It has been used
> on graphs with more than 10.000 vertices.
>
> APPLY:
> * [attachment:trac_13808-v3.patch]
New description:
This patch implements algorithms for computing the Gromov hyperbolicity of
a graph. Although the worst case time complexity is in `O(n^4)`, the
proposed implementation performs quite well in practice. It has been used
on graphs with more than 10.000 vertices.
APPLY:
* [attachment:trac_13808-v3.patch]
* [attachment:trac_13808-rev.patch]
* [attachment:trac_13808-rev2.patch]
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Comment (by dcoudert):
Thanks for the revision patch. I did some more improvements in the rev2
patch to prevent others bugs. In particular, I found that the
{{{c_distances_all_pairs}}} function returns NULL when the memory space is
too small. I have added dedicated test, but may be we should patch the
distance all pairs function.
Q: should we add a message to MemoryError like "Not enough memory to
execute the function.". We cannot doctest this because this is machine
dependent.
Let me know.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13808#comment:17>
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