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## 2.2.4 Evolution Strategy
import array
import random
from deap import base
from deap import creator
from deap import tools
creator.create("FitnessMin", base.Fitness, weights=(-1.0,))
creator.create("Individual", array.array, typecode="d",
fitness=creator.FitnessMin, strategy=None)
creator.create("Strategy", array.array, typecode="d")
def initES(icls, scls, size, imin, imax, smin, smax):
ind = icls(random.uniform(imin, imax) for _ in range(size))
ind.strategy = scls(random.uniform(smin, smax) for _ in range(size))
return ind
IND_SIZE = 10
MIN_VALUE, MAX_VALUE = -5., 5.
MIN_STRAT, MAX_STRAT = -1., 1.
toolbox = base.Toolbox()
toolbox.register("individual", initES, creator.Individual,
creator.Strategy, IND_SIZE, MIN_VALUE, MAX_VALUE, MIN_STRAT,
MAX_STRAT)
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