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128 lines (94 loc) · 5.47 KB
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import logging
"""
Ваше задание:
1. Используя код из differential_evolution.py, напишите собственный логгер, который будет логгировать каждый запуск и каждый логический этап работы алгоритма
2. Ваш логгер должен сохранять логи с 1, 2, 3 уровнями логгирования в файл logging_de.log
3. Если результат отработки алгоритма больше 1e-3, то логгируем результат с уровнем ERROR. Если результат больше 1e-1, то CRITICAL.
Также лог должен в себе отражать параметры алгоритма, такие как начальная популяция, размер популяции, количество итераций и тд.
4. ERROR и CRITICAL должны сохранятся в файл errors.log
5. Напишите свой форматтер, который будет отражать:
a. Время логгирования в формате datetime
б. Имя логгера
в. Уровень логгирования
г. Действие, которое было выполнено
ВАЖНО!
Весь код требуется писать в данном файле, не трогая исходный differential_evolution.py
Удачи!
"""
import numpy as np
class DifferentialEvolution:
def __init__(self, fobj, bounds, mutation_coefficient=0.8, crossover_coefficient=0.7, population_size=20):
self.fobj = fobj
self.bounds = bounds
self.mutation_coefficient = mutation_coefficient
self.crossover_coefficient = crossover_coefficient
self.population_size = population_size
self.dimensions = len(self.bounds)
self.a = None
self.b = None
self.c = None
self.mutant = None
self.population = None
self.idxs = None
self.fitness = []
self.min_bound = None
self.max_bound = None
self.diff = None
self.population_denorm = None
self.best_idx = None
self.best = None
self.cross_points = None
def _init_population(self):
self.population = np.random.rand(self.population_size, self.dimensions)
self.min_bound, self.max_bound = self.bounds.T
self.diff = np.fabs(self.min_bound - self.max_bound)
self.population_denorm = self.min_bound + self.population * self.diff
self.fitness = np.asarray([self.fobj(ind) for ind in self.population_denorm])
self.best_idx = np.argmin(self.fitness)
self.best = self.population_denorm[self.best_idx]
def _mutation(self):
self.a, self.b, self.c = self.population[np.random.choice(self.idxs, 3, replace = False)]
self.mutant = np.clip(self.a + self.mutation_coefficient * (self.b - self.c), 0, 1)
return self.mutant
def _crossover(self):
cross_points = np.random.rand(self.dimensions) < self.crossover_coefficient
if not np.any(cross_points):
cross_points[np.random.randint(0, self.dimensions)] = True
return cross_points
def _recombination(self, population_index):
trial = np.where(self.cross_points, self.mutant, self.population[population_index])
trial_denorm = self.min_bound + trial * self.diff
return trial, trial_denorm
def _evaluate(self, result_of_evolution, population_index):
if result_of_evolution < self.fitness[population_index]:
self.fitness[population_index] = result_of_evolution
self.population[population_index] = self.trial
if result_of_evolution < self.fitness[self.best_idx]:
self.best_idx = population_index
self.best = self.trial_denorm
def iterate(self):
for population_index in range(self.population_size):
self.idxs = [idx for idx in range(self.population_size) if idx != population_index]
self.mutant = self._mutation()
self.cross_points = self._crossover()
self.trial, self.trial_denorm = self._recombination(population_index)
result_of_evolution = self.fobj(self.trial_denorm)
self._evaluate(result_of_evolution, population_index)
def rastrigin(array, A=10):
return A * 2 + (array[0] ** 2 - A * np.cos(2 * np.pi * array[0])) + (array[1] ** 2 - A * np.cos(2 * np.pi * array[1]))
if __name__ == "__main__":
function_obj = rastrigin
bounds_array = np.array([[-20, 20], [-20, 20]]), np.array([[-10, 50], [-10, 60]]), np.array([[-0, 110], [-42, 32]])
steps_array = [40, 100, 200]
mutation_coefficient_array = [0.5, 0.6, 0.3]
crossover_coefficient_array = [0.5, 0.6, 0.3]
population_size_array = [20, 30, 40, 50, 60]
for bounds in bounds_array:
for steps in steps_array:
for mutation_coefficient in mutation_coefficient_array:
for crossover_coefficient in crossover_coefficient_array:
for population_size in population_size_array:
de_solver = DifferentialEvolution(function_obj, bounds, mutation_coefficient=mutation_coefficient, crossover_coefficient=crossover_coefficient, population_size=population_size)
de_solver._init_population()
for _ in range(steps):
de_solver.iterate()