#16347: Wilson's constructions of OA with 2 truncated groups
-------------------------------------+-------------------------------------
Reporter: ncohen | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: u/ncohen/16347 | 2e463514ceb2fb48d3c6fdc2a3391055bfafe373
Dependencies: #16391, #16373 | Stopgaps:
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Description changed by vdelecroix:
Old description:
> Heeeeeeeere it is ! The new construction !
>
> As a result, the MOLS table really took a lifetime to fill. So I turned
> TD and OA into cached functions and they give their answer MUCH faster.
> The bad side is that it also cached the OA/TD, and this is not
> necessarily a good idea. The idea would be to cache ONLY the
> boolean/integer answers, but I do not know how right now.
>
> Anyway caching the OA/TD is not as bad as it seems, for it will only
> build those who are useful in some construction the users asks. When an
> OA is not useful, a existence check is made before building the actual
> design, so this is cool !
>
> I asked on #15657 if the guys there knew a way to tune cached_function to
> only cache some inputs.
>
> Note that MOLS is not a cached_function, because they output matrix
> objects .... Does not matter much anyway, the MOLS constructor does not
> contain much.
>
> Nathann
>
> TODO : Update #16423 when this patch is reviewed
New description:
Heeeeeeeere it is ! The new construction !
As a result, the MOLS table really took a lifetime to fill. So I turned TD
and OA into cached functions and they give their answer MUCH faster. The
bad side is that it also cached the OA/TD, and this is not necessarily a
good idea. The idea would be to cache ONLY the boolean/integer answers,
but I do not know how right now.
Anyway caching the OA/TD is not as bad as it seems, for it will only build
those who are useful in some construction the users asks. When an OA is
not useful, a existence check is made before building the actual design,
so this is cool !
I asked on #15657 if the guys there knew a way to tune cached_function to
only cache some inputs (see also the following threads on sage-devel
[[https://groups.google.com/forum/#!topic/sage-
devel/OPe5VJpBiB4|cached_function: a filter to only cache some inputs ?]]
and [[https://groups.google.com/forum/#!topic/sage-
devel/rnqhwGk6e0E|cached_function: cache a(n) only when n is *not* a prime
power]]).
Note that MOLS is not a cached_function, because they output matrix
objects .... Does not matter much anyway, the MOLS constructor does not
contain much.
Nathann
TODO : Update #16423 when this patch is reviewed
--
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Ticket URL: <http://trac.sagemath.org/ticket/16347#comment:11>
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