import random
from detpy.DETAlgs.base import BaseAlg
from detpy.DETAlgs.data.alg_data import EIDEData
from detpy.DETAlgs.methods.methods_de import mutation, binomial_crossing, selection
from detpy.DETAlgs.methods.methods_eide import eide_adopt_parameters
from detpy.models.enums.boundary_constrain import fix_boundary_constraints
[docs]
class EIDE(BaseAlg):
"""
EIDE
Links:
https://ieeexplore.ieee.org/document/6390324
References:
Z. Dexuan and G. Liqun, "An efficient improved differential evolution algorithm,"
Proceedings of the 31st Chinese Control Conference, Hefei, China, 2012, pp. 2385-2390.
"""
def __init__(self, params: EIDEData, db_conn=None, db_auto_write=False):
super().__init__(EIDE.__name__, params, db_conn, db_auto_write)
self.mutation_factor = random.uniform(0, 0.6)
self.crossover_rate = params.crossover_rate_min
self.crossover_rate_min = params.crossover_rate_min
self.crossover_rate_max = params.crossover_rate_max
self.generation = None
[docs]
def next_epoch(self):
# New population after mutation
v_pop = mutation(self._pop, f=self.mutation_factor)
# Apply boundary constrains on population in place
fix_boundary_constraints(v_pop, self.boundary_constraints_fun)
# New population after crossing
u_pop = binomial_crossing(self._pop, v_pop, cr=self.crossover_rate)
# Update values before selection
u_pop.update_fitness_values(self._function.eval, self.parallel_processing)
# Select new population
new_pop = selection(self._pop, u_pop)
self.mutation_factor, self.crossover_rate = eide_adopt_parameters(self.crossover_rate_min,
self.crossover_rate_max, self._epoch_number,
self.num_of_epochs)
# Override data
self._pop = new_pop
self._epoch_number += 1