[Scip] Setting Branching Priority with .set file

[Yuji Shinano]

Hi lotu1,

I made a mistake.
The branching priorities are not specified with a settings file.
Then, you are right, it is not possible.

Best,
Yuji


On 2015/03/31 5:53, Yuji Shinano wrote:
> Hi lotu1,
>
> On 2015/03/30 19:27, lotu1 at gmx.de wrote:
>> Thanks, that's what I'm doing currently. I just ran into some blocking issues when trying to pass
>> alot of these variable settings through the command line. This might however have been caused by
>> passing in the settings trough a java programme. I'll try the option with using an external file for
>> these command, as you suggested.
>> However, I'm also interested in using these branching pririties for fscip. But I guess that won't be
>> possible.
>
> It would be possible. You can specify all parameter settings for SCIP to fscip by using -sr and -s
> options.
>
>      "fscip fscip_param_file problem_file_name [-l <logfile>] [-q] [-sl <settings>] [-s <settings>]
> [-sr <root_settings>]
>       [-w <prefix_warm>] [-sth <number>] [-fsol <solution_file>] [-isol <initial solution file]"
>         -l <logfile>           : copy SCIP output into log file
>         -q                     : suppress SCIP screen messages
>         -sl <settings>         : load parameter settings (.set) file for LoadCoordinator presolving
>         -sr <root_settings>    : load parameter settings (.set) file for root node subtree solving
>         -s <settings>          : load parameter settings (.set) file for additional node solving
>         -w <prefix_warm>       : warm start file prefix ( prefix_warm_nodes.gz and
> prefix_warm_solution.txt are read )
>         -sth <number>          : the number of solver threads used
>         -fsol <solution file> : specify output solution file
>         -isol <intial solution file> : specify initial solution file
>
> One thing you have to do is to specify nopresolve_in_lc.set which is a fscip_param_file
> to prohibit presolving in LoadCorrdinaotr and is provided in setting directory.
>
> However, whether if it works well or not depending on how presolveing works on your instances
> and how much effect you can expect from your settings.
>
> Best,
> Yuji
>
>
>> *Gesendet:* Montag, 30. März 2015 um 11:48 Uhr
>> *Von:* "Jakob Witzig" <witzig at zib.de>
>> *An:* lotu1 at gmx.de
>> *Cc:* scip at zib.de
>> *Betreff:* Re: [Scip] Setting Branching Priority with .set file
>> Hi lotu1,
>>
>> my first answer was not complete in probably to general. First, set the
>> priority of variables through a *.set file is not possible but you can
>> change the priority by using the interactive shell after loading your
>> problem.
>>
>> A workaround would be using a "command file", e.g., myCommands.txt.
>> Therefore, you use a file with some content like this:
>>
>> read myFile
>> set branching priority myVar1 prio1
>> set branching priority myVar2 prio2
>> optimize
>> quit
>>
>> and you execute SCIP with the command "scip < myCommands.txt"
>>
>> Best,
>> Jakob
>>
>> On 03/30/15 11:01, Jakob Witzig wrote:
>>  > Hi lotu1.
>>  >
>>  > No, it is not possible to specify branching priorities for variables. If
>>  > you want to do this, you have to write your own branching rule, see:
>>  > http://scip.zib.de/doc/html/BRANCH.php.
>>  >
>>  > Best,
>>  > Jakob
>>  >
>>  > On 03/30/15 10:13, lotu1 at gmx.de wrote:
>>  >> is it possible to set branching priorities (set/branching/priority) on
>>  >> variables through a settings file? What is the syntax for this? E.g.
>>  >> this does not work: set/branching/priority/myVar = 5
>>  >> Thanks
>>  >>
>>  >>
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>>  >
>>  >
>>
>>
>> --
>> Jakob Witzig
>>
>> Konrad-Zuse-Zentrum für
>> Informationstechnik Berlin (ZIB)
>>
>> Division Mathematical Optimization and Scientific Information
>> Research Group Mathematical Optimization Methods
>>
>> Takustrasse 7
>> 14195 Berlin
>>
>> Tel. : +49 (0)30 84185-416
>> Fax : +49 (0)30 84185-269
>> email: witzig at zib.de
>>
>>
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