Selection

pangadfs.select

SelectDefault()

Bases: SelectBase

Source code in pangadfs/base.py

def __init__(self):
    logging.getLogger(__name__).addHandler(logging.NullHandler())

select(*, population, population_fitness, n, method='roulette', **kwargs)

Select individuals in population using specified method.

Parameters:

Name	Type	Description	Default
population	ndarray	the population to mutate. Shape is n_individuals x n_chromosomes.	required
population_fitness	ndarray	the population fitness. Is a 1D array same length as population.	required
n	int	total number of individuals to select	required
method	str	'roulette', 'su', 'scaled'; default 'roulette'	'roulette'
**kwargs		keyword arguments for plugins	{}

Returns:

Type	Description
ndarray	np.ndarray: selected population

Source code in pangadfs/select.py

def select(self, 
           *, 
           population: np.ndarray, 
           population_fitness: np.ndarray,
           n: int,
           method: str = 'roulette',
           **kwargs) -> np.ndarray:
    """Select individuals in population using specified method.

    Args:
        population (np.ndarray): the population to mutate. Shape is n_individuals x n_chromosomes.
        population_fitness (np.ndarray): the population fitness. Is a 1D array same length as population.
        n (int): total number of individuals to select
        method (str): 'roulette', 'su', 'scaled'; default 'roulette'
        **kwargs: keyword arguments for plugins

    Returns:
        np.ndarray: selected population

    """
    dispatch = {
        'roulette': self._roulette_wheel,
        'sus': self._sus,
        'rank': self._rank,
        'tournament': self._tournament,
        'scaled': self._scaled,
        'fittest': self._fittest
    }        

    params = {
        'population': population,
        'population_fitness': population_fitness,
        'n': n
    }

    return dispatch.get(method, self._roulette_wheel)(**params, **kwargs)