[Cbc] MIP optimizing

[Haroldo Gambini Santos]

To use recommended parameters of the rightmost leaf node you shoud call
cbc instance.mps zero ifmove multiple 2 latwomir endonly lagomory 
endonly solve solu solution.sol

​========================================================
Haroldo Gambini Santos
Computing Department
Universidade Federal de Ouro Preto - UFOP
email: haroldo [at ] iceb.ufop.br
home/research page: www.decom.ufop.br/haroldo


It has long been an axiom of mine that the little things are infinitely
the most important.
-- Sir Arthur Conan Doyle, "A Case of Identity"

Em seg, set 4, 2017 em 6:37 , Bjørn Sigurd Johansen (Spider Solutions 
AS) <bjorn.sigurd.johansen at spidersolutions.no> escreveu:
> Ok, thanks, but how does this translate to cbc command line 
> parameters?
> 
> Cheers, Bjorn
> 
> 
> -------- Opprinnelig melding --------
> Fra: Haroldo Gambini Santos <haroldo.santos at gmail.com>
> Dato: 04.09.2017 23:27 (GMT+01:00)
> Til: "Bjørn Sigurd Johansen (Spider Solutions AS)" 
> <bjorn.sigurd.johansen at spidersolutions.no>
> Ko: cbc at list.coin-or.org
> Emne: Re: [Cbc] MIP optimizing
> 
> Hi,
> 
> I tested 50 different parameter settings on different problems and 
> built a decision tree to select parameters:
> 
> http://www.decom.ufop.br/haroldo/files/dtree.pdf
> 
> Instance features appear in the nodes and modified parameters appear 
> at the leafs.
> 
> Ex:
> |partitioning| indicates how many partitioning constraints your model 
> has, i.e. constraints in the format
> x1 + x2.... + xn = 1
> 
> minAij  indicates the minimum coefficient in the constraint matrix ( 
> some cuts work great with 0/1 matrixes other require special 
> structures)
> 
> In this page there is an explanation of constraint types
> http://miplib.zib.de/miplib2003/miplib2003.php
> 
> 
> Cheers,
> 
> Haroldo
> 
> ​======================================================== Haroldo 
> Gambini Santos Computing Department Universidade Federal de Ouro 
> Preto - UFOP email: haroldo [at ] iceb.ufop.br home/research page: 
> www.decom.ufop.br/haroldo It has
>  long been an axiom of mine that the little things are infinitely the 
> most important. -- Sir Arthur Conan Doyle, "A Case of Identity"
> 
> Em seg, set 4, 2017 em 6:03 , Bjørn Sigurd Johansen (Spider 
> Solutions AS) <bjorn.sigurd.johansen at spidersolutions.no> escreveu:
>> Hi all,
>> 
>> I have a (“normal”?) MIP optimization problem:
>> 1500 integer variables
>> 1500 binary variables
>> 1500 simple constraint between the integer and the binary variables.
>> 50 (large) equations/constraints including all integer variables.
>> Objective function including all integer variables.
>> 
>> I have understood that it is possible to tune cbc?
>> Using command line options, I assume.
>> Any tip on tuning to try out?
>> 
>> Currently, a solution is generated in 60 seconds with ratiogap 0.05. 
>>  Due to repeated runs, reducing this time would be very good.
>> 
>> I have a Windows compiled cbc.exe from august 1st 2016.  Probably 
>> version approx. 2.9.8, but cannot be sure on this
>> 
>> 
>> Bjorn
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