I'm tryingpygad (2.16.3) for the first time , and have found the check for the number of arguments of the fitness function to be overly sensitive, e.g. I would like to be able to pass fitness functions of the following types:

Class instance functions:

importpygadclassFitness:deffitness(self,x,idx):returnsum(x)foo=Fitness()ga_instance=pygad.GA(num_generations=10,num_parents_mating=5,fitness_func=foo.fitness,sol_per_pop=10,num_genes=5,)

Incorrectly triggers an error that fitness requires 3 parameters, sincef.fit.__code__.co_argcount returns 3 (includingself). Checking withsignature instead could be an alternative:

frominspectimportsignaturelen(signature(f.fit).parameters)>>>2

Functions with additional parameters that have default values:

importpygaddeffitness(x,idx,y=3):returnsum(x)ga_instance=pygad.GA(num_generations=10,num_parents_mating=5,fitness_func=fitness,sol_per_pop=10,num_genes=5,)

Also triggers an error, butfitness can be called with 2 parameters as required. Unsure of a workaround for this one.

Is there any reason whypygad couldn't use either of these fitness functions? I'd especially like to be able to use a function of a class instance for one of my projects.