#10205: Random test in sage.graphs.generic_graph_pyx.find_hamiltonian takes a
very
long time
------------------------+---------------------------------------------------
Reporter: jdemeyer | Owner: mvngu
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.1
Component: doctest | Keywords: graph find_hamiltonian
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Description changed by jdemeyer:
Old description:
> The following test from {{{sage/graphs/generic_graph_pyx.pyx}}} takes a
> very long time:
> {{{
> TESTS:
>
> Running the algorithm on random instances, just to make sure the
> answers are still satisfiable path (the algorithm would raise an
> exception otherwise)::
>
> sage: for i in range(200):
> ... g = graphs.RandomGNP(20,.1)
> ... _ = fh(G,find_path=True)
> }}}
> It looks like {{{g}}} should be {{{G}}}. Making this change makes the
> runtime even larger.
>
> At the very least, it should be marked {{{# long time}}} but even then I
> think it takes way too long. Possibly some other tests in that file
> should also be marked {{{# long time}}}.
>
> See #9698 where the algorithm was implemented.
New description:
The following test from {{{sage/graphs/generic_graph_pyx.pyx}}} takes a
very long time:
{{{
TESTS:
Running the algorithm on random instances, just to make sure the
answers are still satisfiable path (the algorithm would raise an
exception otherwise)::
sage: for i in range(200):
... g = graphs.RandomGNP(20,.1)
... _ = fh(G,find_path=True)
}}}
It looks like {{{g}}} should be {{{G}}}. Making this change makes the
runtime even larger.
At the very least, it should be marked {{{# long time}}} but even then I
think it takes way too long. Possibly some other tests in that file
should also be marked {{{# long time}}}.
See #9698 where the algorithm was implemented, see also #10206 for more
issues.
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10205#comment:3>
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