Hi Reza,
As I know, one of the EMP framework´s tasks is to reformulate a bi-level problem into a single-level problem by replacing the lower level problem with its necessary optimality condition (i.e., KKT). This single-level problem can then be passed onto a continuous/discrete solver. So, if the lower level is itself a discrete problem, I think you cannot use GAMS. I suggest you to consider metaheuristics.
Hossein
On 9 Nov 2015 19:14, "Reza Atayi" wrote:
dear all
I should write a bilevel model and I have to use discrete variables in both leader and follower equations
I studied about emp solver and used its format in my code
but when I run the GAMS I have this error message
JAMS Discrete variables are only supported in leader . Abort!
JAMS pre processing faild
my question is that is there any other ways to write bilevel problems in gams?
and here is what i used in my code:
model H_CEN /all/ ;
$onecho > "%emp.info%"
bilevel lu lv lh a b
max zf fu fv fh y four five six seven eight nine ten twenty
$offecho
if you need more detail I attach the file .
i will be gratefull if you could help me
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