generation callback not executed properly, leads to unwanted repition of fitness function about geneticalgorithmpython HOT 2 CLOSED

That's very helpful! Thank you and sorry for the confusion. I appreciate the response and love the project!

from geneticalgorithmpython.

There is nothing wrong. Just let me explain how things are calculated.

Given that there are N solutions in the population, then internally to PyGAD the fitness function fitness_func() will be called N times, once for each solution.

Inside the callback_generation() function, the first line executed does not make the fitness function to be called at all. So, the number of times fitness_func() is called is still N.

The second line in callback_generation() calls the best_solution() method which in turn calls fitness_func(). So, for each of the N solutions, fitness_func() is called twice in the generation, one internally to PyGAD and another by the best_solution(). So, the total number of calls is 2N.

Note that there is an attribute called last_generation_fitness which holds the fitness values of the last generation. You can use it rather than calling best_solution().

I hope this makes things clear.

from geneticalgorithmpython.