Originally posted by: anahana

Hi all,

I'm using CP 1.6 to develop an evolutionary algorithm and was wondering if I can do the same within CPLEX Optimization Studio 12.2, that is, a way to import Solver's EA libraries into CPLEX 12.2.

Regards,
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#DecisionOptimization

Originally posted by: SystemAdmin

Hello,
No, this is not possible. There is no generic EA library provided on top of CPLEX Optimization Studio. Note anyway that for CP problems, CPLEX Optimization Studio provides an automatic search algorithm based on EA. In order to switch to this search method you should set the following parameter on the instance of IloCP: cp.setParameter(IloCP::SearchType, IloCP::MultiPoint).

Philippe
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Originally posted by: anahana

Hi Philippe,

Thanks for getting back to me. If I use this automatic search algorithm in CPLEX, how much flexibility do I get in controlling its behavior? As I don't need a standard EA.

Alternatively, can I import any of CPLEX libraries into CP? I
#CPOptimizer
#DecisionOptimization

Originally posted by: anahana

Hi Philippe,

Thanks for getting back to me. If I use this automatic search algorithm in CPLEX, how much flexibility do I get in controlling its behavior? As I don't need a standard EA.

Alternatively, can I import any of CPLEX libraries into CP? This would make things easier I guess.

Regards,
#CPOptimizer
#DecisionOptimization

Originally posted by: rdumeur

Dear Anahana,

You can control the MultiPoint search in CPLEX with the
MultiPointNumberOfSearchPoints parameter which controls the number of solutions
(population size) managed by CPO's multi point search.
By default it is 30, but you can to reduce it to 10 and see if this speeds convergence up,
at the cost of possibly worsened solution quality.

Concerning the importation of CPLEX libraries into CP, if your desire is to use CP model elements (variables, constraints) in CPLEX, I am afraid it is not possible.
I hope this helps.
Cheers!

Renaud
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#DecisionOptimization

Originally posted by: anahana

Dear Renaud,

Thanks for your feedback, but I'm afraid I'll need to control more than the population size. I guess I'll have to solve the problem I have without using CPLEX in CP.

Regards,
#CPOptimizer
#DecisionOptimization