[Cbc] Determinism with divingV option

[John Forrest]

Yves,

It is to be expected!  When an heuristic is added it is given an initial 
seed for use in generating pseudo random numbers.  This seed is changed 
depending on k for the k'th heuristic.  So adding divingVectorLength 
changes the seed for the RINS heusristic.

If you don't like that, I can easily add an ifdef so 
-DSAME_HEURISTIC_SEED will switch off - in CbcModel:addHeuristic.

John



On 06/02/15 14:03, Yves Touchard wrote:
> Hello,
>
> I got a determinism problem with the lp file (and maybe others) 
> located here: /https://www.dropbox.com/s/0i7c84lbm2pvyl3/t1.lp?dl=0/.
> The solution file is different  whether the divingV option is set or not.
> Command-line is the following:
>
> /b//in/cbc t1.lp threads 104 ratio 0.05 cutlength 30 *divingV* on 
> divesolves 301 multiple 1 branch printingOptions rows solution t1_0.sol/
>
> Solution files are located here:
>
>   * Without -> /https://www.dropbox.com/s/zcu8kwv9ukipaqe/t1_0.sol?dl=0/
>   * With -> /https://www.dropbox.com/s/jc1co4yeg9i13vw/t1_1.sol?dl=0/
>
> I tried with both trunk revision 2102 and 2128.
> Could you tell if it is an expected behaviour or not?
>
> Thanks & Regards
>
> Yves
>
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