[SCIP] cuts.c

[Wang, Tony Congqian]

Hello Leona,


thanks for the quick reply. Thats also what I was thinking. I have two other questions:


  1.  Why is minefficacy not used in SCIPsepastoreApplyCuts? SCIPsetIsFeasPositive(set, SCIProwGetLPEfficacy(cut, set, stat, lp)) is called anyway, so I guess it isn't the separators task to check for minefficacy, so shouldn't there be SCIPsetIsFeasPositive(set, SCIProwGetLPEfficacy(cut, set, stat, lp) - "minefficacy" )
  2.  Objectparallelism is not calculated when not using debug-mode since checkRowObjprod() is deactivated in non-debug-mode. Is this intended (since objectparallelism seems to not give a lot of improvement and is appearently slow to calculate)? What makes me wonder though is that SCIProwGetObjParallelism() is the only function that calls checkRowObjprod() and SCIProwGetObjParallelism() is only referenced by selectCuts(). So why even bother disabling the function when the user can disable the use by setting objparalweight = 0

Best Regards,
Tony
________________________________
Von: Scip <scip-bounces at zib.de> im Auftrag von Leona Gottwald <gottwald at zib.de>
Gesendet: Mittwoch, 14. August 2019 12:43:51
An: scip at zib.de
Betreff: Re: [SCIP] cuts.c


Hello Tony,


thanks for your question, indeed that does not make sense and was not intended.


The code will be changed to add the dircutoffdistweight instead of the objparalweight in the next release which is consistent with the behavior for locally valid cuts.


Best,

Leona


On 8/12/19 12:48 AM, Wang, Tony Congqian wrote:

Hello community,


I have a question regarding cuts.c:2563 -- efficacyfac += objparalweight; --. I couldn't find the reasoning of this addition anywhere. It is done, when dircutoffdistance is not calculated (either due to missing incumbent or dircutoffdistweight == 0). So I would think, that in the case that the incucmbent is missing, efficacy would get more weight, but I can't yet see the reasoning behind adding objparalweight on it.


Best Regards,

Tony



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