On 24/04/2013, at 20:32, Tias Guns <tias.g...@cs.kuleuven.be> wrote:
> On Thu, 18 Apr 2013 09:36:13 +0200, Guido Tack <t...@gecode.org> wrote:
>
>> Hi Tias,
>>
>> it's slightly complicated (and it has changed in Gecode 4). The default
>> search is implemented in gecode/flatzinc/flatzinc.cpp in function
>> createBranchers, and the defaults in 4.0.0 are
>>
>> branch(*this, iv_sol, INT_VAR_AFC_SIZE_MAX(0.99), INT_VAL_MIN());
>> branch(*this, bv_sol, INT_VAR_AFC_MAX(0.99), INT_VAL_MIN());
>> branch(*this, fv_sol, FLOAT_VAR_SIZE_MIN(), FLOAT_VAL_SPLIT_MIN());
>> branch(*this, sv_sol, SET_VAR_AFC_SIZE_MAX(0.99), SET_VAL_MIN_INC());
>>
>> where iv_sol are the variables mentioned in the output statement and not
>> mentioned in an explicit search annotation, and
>>
>> branch(fzs,fzs.iv_aux,INT_VAR_AFC_SIZE_MAX(),INT_VAL_MIN());
>> branch(fzs,fzs.bv_aux,INT_VAR_AFC_MAX(),INT_VAL_MIN());
>> branch(fzs,fzs.sv_aux,SET_VAR_AFC_SIZE_MAX(),SET_VAL_MIN_INC());
>> branch(fzs,fzs.fv_aux,FLOAT_VAR_AFC_SIZE_MAX(),FLOAT_VAL_SPLIT_MIN());
>>
>> where iv_aux are variables introduced by mzn2fzn that are not functionally
>> defined.
>>
>> I'm planning to introduce annotations default_{int,bool,set,float}_search
>> that you can stick on the solve item to change the default for the different
>> variable types - would that be useful?
>
> Yes.
>
> But since your asking, would there be a way to express the exact search
> strategy (on the *_sols) in minizinc itself, instead of introducing a new
> default_* annotation?
>
> For example:
> int_search(IntVars, size_afc_max(0.99), indomain_min, complete);
>
> (I guess the only difference with what is available now is adding the 0.99?)
>
Yes, that's possible. I'll add support for this next week.
Cheers,
Guido
>
> Kind regards,
> Tias
>
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>
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