[Scip] "Hidden" cut generators

Stefan Vigerske stefan at math.hu-berlin.de
Thu Nov 22 17:09:35 MET 2012


Hi,

happy to see you on this list :-).

Constraint handlers also do separation, maybe that's where the cuts came 
from.
Do you get any numbers in the "Cuts" column for constraint handler 
statistics?
If not, just send then the full output of "display statistics".

Best,
Stefan

On 11/22/2012 04:45 PM, Giacomo Nannicini wrote:
> Hi all,
> I noticed a strange behavior in SCIP that makes me think there are
> some "hidden" cut generators.
>
> I manually disabled *all* separators from scipdefplugin.c (I commented
> out all lines with SCIPincludeSepa). No cut generators are listed in
> SCIP when I use "set separating" or in the final "display statistics".
> However, some cuts *are* generated. In some logs, I get a nonzero
> number of cuts indicated, even though "display statistics" says that
> there are no separators. Cut pool size stays at zero. Also, the
> solution path is different from what I get if I set "set separating
> maxroundsroot 0". With the latter setting, no cuts appear.
>
> Can somebody enlighten me?
>
> Thanks a lot!
>
> Giacomo
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