External loop control

[constructor-igor]

Hi,

We made feasibility of GeneticSharp and now we investigate how GeneticSharp can be integrated with our system and found a next issue: our system manages external loop and requires to get population to calculate Fitness and set calcualted Fitness values to algorithm. So, I cannot calculate fitness in CreateNewGeneration (as suggested in #45).

sample of pseudo code:

while (geneticAlgoritm.InProgress){
    population = geneticAlgoritm.GetPopulation();
    CalculateFitness(population) // [our code] calculate and set Fitness value to each chromosome
    geneticAlgoritm.SetFitness(population)
}

Looks, I need find loop inside GeneticSharp and, somehow, to re-implement for our control. Please, could you help me to understand what is the easiest way to implement the feature and I'll try to do it.

thank you, Igor.

[giacomelli]

Part of the loop is performed here: https://github.com/giacomelli/GeneticSharp/blob/master/src/GeneticSharp.Domain/GeneticAlgorithm.cs#L315

and here: https://github.com/giacomelli/GeneticSharp/blob/master/src/GeneticSharp.Domain/GeneticAlgorithm.cs#L356

However, I did not understand why you cannot use the solution from #45, because as you can see here every generation evolved calls the Population.CreateNewGeneration(newGenerationChromosomes).

Please, could you explain better why you cannot use CreateNewGeneration?

[constructor-igor]

thank you for information. I'll investigate it. Because design of our system, I cannot inject "fitness calculator" inside ExternalEvaluationPopulation. External loop should get population, calculate fitness outside of any "genetic classes" and inject calculate fitness inside genetic to generate new population.

while (geneticAlgoritm.InProgress){
    population = geneticAlgoritm.GetPopulation();  // get population
    CalculateFitness(population) // [our code] calculate and set Fitness value to each chromosome
    geneticAlgoritm.SetFitness(population) // set fitness
}

[constructor-igor]

I investigated code in your suggestion. Now, I better understand how can I change code for our integration. Thank you!

[giacomelli]

Nice! Let me know if you will need any advice in the future and whether your integration worked.

[constructor-igor]

Please, could you help me to understand next issue: I cannot compile class GeneticAlgorithm, because a error in line: https://github.com/giacomelli/GeneticSharp/blob/ac17144427e31f2a073cac87a79ae14a4912e013/src/GeneticSharp.Domain/GeneticAlgorithm.cs#L427