[Scip] How to terminate SCIP earlier?
Ambros Gleixner
gleixner at zib.de
Wed Sep 24 02:21:17 CEST 2014
Dear Xiangyong,
Am 24.09.2014 02:08, schrieb lixiangyong at 163.com:
> Dear Dr. Gerald,
>
> Thanks, I have used SCIPinterruptSolve() to terminate my solving
> process since I know the current incumbent is the optimal solution.
>
> BTW, can you tell me the advantage of calling SCIPsetObjIntegral() if I
> know any feasible solution should have an integer objective value? Can
> it speed up the solving process?
Yes. If (in minimization) the primal bound is x and the lower bound is
greater than x - 1, the solution process can be stopped already.
Best regards,
Ambros
>
>
> Thanks,
>
>
> Xiangyong
>
> *From:* Gerald Gamrath <mailto:gamrath at zib.de>
> *Date:* 2014-09-23 17:16
> *To:* lixiangyong at 163.com <mailto:lixiangyong at 163.com>; scip
> <mailto:scip at zib.de>
> *Subject:* Re: [Scip] How to terminate SCIP earlier?
> Dear Xiangyong Li,
>
> if you know that every feasible solution will have an integer
> objective value and therefore want to stop the solving process when
> the dualbound is larger than primalbound - 1, you can just inform
> SCIP that this is the case by calling SCIPsetObjIntegral().
>
> Otherwise, you can call SCIPinterruptSolve() to stop the solving
> process, but SCIP will then print that it was interrupted, not that
> it was solved to optimality.
>
> Best,
> Gerald
>
> Am 23.09.2014 um 10:02 schrieb lixiangyong at 163.com:
>> Dear all,
>>
>> I am using SCIP to implement my branch and price algorithm.
>> Now I want to terminate the SCIP earlier since I can judge the
>> problem has been optimally solved when some condition is satisfied.
>> Suppose UB and LB be the objective value of best incumbent and the
>> best remaining node in the branch and bound tree.
>> For my instances considered, SCIP has optimally solved one
>> instance if UB-LB < 1.
>>
>> Can you tell me how to set the earlier termination condition in SCIP?
>>
>> Thanks,
>>
>>
>> Xiangyong Li
>>
>>
>>
>>
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>
>
>
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--
____________________________________________________________
Ambros M. Gleixner
Zuse Institute Berlin - Matheon - Berlin Mathematical School
http://www.zib.de/gleixner
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