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A simple implementation of Genetic Algorithm

Project description

simplega

simplega is a simple python implementation of genetic algorithm and it is available through PyPI.

Install

python3 -m pip install simplega

Usage

Import the package

from simplega import Chromosome, Population, GA, GAHelper
# or
from simplega import *

Create a fitness function that suits toyr problem

def maximize(chromosome):
    return sum( [ ord(gene) for gene in chromosome.dna ] )

Create a new instance of GA specifying the fitness function to be used

ga = GA(maximize)

Perform the steps of the genetic algorithm and retrieve the fittest chromosome

ga.run()
print(ga.get_fittest())

All the script - really simple:

from simplega import *

def maximize(chromosome):
    return sum( [ ord(gene) for gene in chromosome.dna ] )

ga = GA(maximize)
ga.run()
print(ga.get_fittest())

Advanced usage

You can customize your instance of GA, replacing any or all of its default values

ga = GA(fitness_function, 
  genes =  [ chr(n) for n in range(65,91) ], 
  chromosome_size =  10, 
  population_size =  100, 
  generations =  100, 
  crossover_points =  1, 
  elitism_rate =  0.05, 
  crossover_rate =  0.85, 
  mutation_rate =  0.01, 
  )

You can print the fittest chromosome of each generation with ga.run(True)

Contributing

Please submit bugfixes, enhancements, unit tests, usecases and examples with a pull request.

Project details


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