Accept user defined functions for crossover and mutate

[b8raoult]

Accept that parameters mutation_type or crossover_type (and even parent_selection_type) are callable instead of just str.

Line 339:

if (crossover_type is None):            
    self.crossover = None       
elif callable(crossover_type):
     self.crossover = crossover_type
elif not (type(crossover_type) is str):
  ...

[ahmedfgad]

Thanks for opening this conversation.

PyGAD 2.16.0 is released right now to support this feature.

This is the release note:
A user-defined function can be passed to the mutation_type, crossover_type, and parent_selection_type parameters in the pygad.GA class to create a custom mutation, crossover, and parent selection operators. Check the User-Defined Crossover, Mutation, and Parent Selection Operators section in the documentation: https://pygad.readthedocs.io/en/latest/README_pygad_ReadTheDocs.html#user-defined-crossover-mutation-and-parent-selection-operators

The example_custom_operators.py script in the GitHub project gives an example of building and using custom functions for the 3 operators.

Please let me know if you have any other feature to be supported.

[b8raoult]

Thanks, that is great. You may also want to add to the documentation the integration with tqdm.

from tqdm import tqdm

num_generations = 100
with tqdm(total=num_generations) as pbar:
    ga_instance = pygad.GA(
        num_generations=num_generations,
        ...,
        on_generation=lambda _: pbar.update(1),
    )
    ga_instance.run()

[ahmedfgad]

That is really helpful! Thank you.

I will definitely refer to this discussion in the documentation. It is so fast in monitoring the progress compared to printing the the generation number in a new function.

Please let me know if you have any other suggestion or bugs to fix.

[dayd]

Hi & thanks for this great tool.
The Progress bar is a great feature but when using the progress bar i can no longer save the results with the save() fct.
I get this error message:
pickle.dump(self, file)
_pickle.PicklingError: Can't pickle <function at 0x1232a59d0>: attribute lookup on main failed

Regards
André

[ahmedfgad]

Thanks @dayd! The issue is solved by defining a function. The following code works:

import pygad
import numpy
import tqdm

equation_inputs = [4,-2,3.5]
desired_output = 44

def fitness_func(solution, solution_idx):
    output = numpy.sum(solution * equation_inputs)
    fitness = 1.0 / (numpy.abs(output - desired_output) + 0.000001)
    return fitness

def on_generation_progress(ga):
    pbar.update(1)

num_generations = 100
with tqdm.tqdm(total=num_generations) as pbar:
    ga_instance = pygad.GA(num_generations=num_generations,
                           sol_per_pop=5,
                           num_parents_mating=2,
                           num_genes=len(equation_inputs),
                           fitness_func=fitness_func,
                           on_generation=on_generation_progress)

    ga_instance.run()

ga_instance.plot_result()

ga_instance.save("test")

[dayd]

Thanks, that's perfect and works like a charm.
André

[S1082351]

Hello, I am using the PyGAD library for the clustering task. I wanted to use a custom crossover operator, therefore I tried checking the ling https://pygad.readthedocs.io/en/latest/README_pygad_ReadTheDocs.html#user-defined-crossover-mutation-and-parent-selection-operators, though it seems it got deleted. Was it move somewhere else?
Please, let me know if there are any examples for the custom cross over operators.
Thank you very much.

[priack]

I assume that you would have found it already, but since I was looking for the same when arrived to this thread, I leave the link for the future:
https://pygad.readthedocs.io/en/latest/utils.html#user-defined-crossover-mutation-and-parent-selection-operators

[S1082351]

Thank you very much for the support. Antonio Politano Da: priack ***@***.***> Inviato: venerdì 5 gennaio 2024 12:15 A: ahmedfgad/GeneticAlgorithmPython ***@***.***> Cc: POLITANO ANTONIO ***@***.***>; Comment ***@***.***> Oggetto: Re: [ahmedfgad/GeneticAlgorithmPython] Accept user defined functions for crossover and mutate (Discussion #50) I assume that you would have found it already, but since I was looking for the same when arrived to this thread, I leave the link for the future: https://pygad.readthedocs.io/en/latest/utils.html#user-defined-crossover-mutation-and-parent-selection-operators - Reply to this email directly, view it on GitHub<#50 (reply in thread)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ANITL4OJXLRYNXVYMVBKPP3YM7OERAVCNFSM465MQ2JKU5DIOJSWCZC7NNSXTOKENFZWG5LTONUW63SDN5WW2ZLOOQ5TQMBSGIYDSOI>. You are receiving this because you commented.Message ID: ***@***.***>