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Error when run parallel_processing "process" #250
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This is a working example. import pygad
import numpy
function_inputs = [4,-2,3.5,5,-11,-4.7] # Function inputs.
desired_output = 44 # Function output.
def fitness_func(ga_instance, solution, solution_idx):
output = numpy.sum(solution*function_inputs)
fitness = 1.0 / (numpy.abs(output - desired_output) + 0.000001)
return fitness
num_generations = 100 # Number of generations.
num_parents_mating = 10 # Number of solutions to be selected as parents in the mating pool.
sol_per_pop = 20 # Number of solutions in the population.
num_genes = len(function_inputs)
last_fitness = 0
def on_generation(ga_instance):
global last_fitness
print(f"Generation = {ga_instance.generations_completed}")
print(f"Fitness = {ga_instance.best_solution(pop_fitness=ga_instance.last_generation_fitness)[1]}")
print(f"Change = {ga_instance.best_solution(pop_fitness=ga_instance.last_generation_fitness)[1] - last_fitness}")
last_fitness = ga_instance.best_solution(pop_fitness=ga_instance.last_generation_fitness)[1]
if __name__ == '__main__':
ga_instance = pygad.GA(num_generations=num_generations,
num_parents_mating=num_parents_mating,
sol_per_pop=sol_per_pop,
num_genes=num_genes,
suppress_warnings=True,
parallel_processing=['process', 2],
fitness_func=fitness_func,
on_generation=on_generation)
# Running the GA to optimize the parameters of the function.
ga_instance.run()
ga_instance.plot_fitness() |
Good afternoon When I perform the : However, if I include the keyword Is this a known problem ? |
In the code, I tried calling the for i in range(5):
ga_instance.run() |
I am getting an error when I try to run with parallel_processing = ["process", 2] the first example on the PyGad webpage. Could somebody please help me with this?
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