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racing_pyai/genetics.py
2019-10-22 15:41:12 +02:00

57 lines
1.5 KiB
Python

import numpy as np
import random
from brain import Neural_Network
def genetic_selection(brains):
# tot_fitness = sum ([int(b.fitness) for b in brains])
# does not seem very optimized... TBR
# constitute a list where every brain is represented
# proportionnally to its relative fitness
wheel = []
for b in brains :
wheel += [b] * b.brains
tot_fitness = len(wheel)
half_pop = int(len(brains)/2)
# selection of pool/2 pair of parents to reproduce
parents_pool = []
for _ in range(half_pop):
parents_pool.append([round(random.random()*tot_fitness), round(random.random()*tot_fitness)])
def cross_mutate_genes(p1_gene, p2_gene):
child = []
p1_gene = list(p1_gene)
p2_gene = list(p1_gene)
for idx,x in enumerate(p2_gene):
if random.random() > 0.5 :
choice = p1_gene
else :
choice = p2_gene
# Mutation
if random.random() < 0.005 :
choice[random.randint(0, len(choice - 1))] = random.random()
print("Mutation !")
child.append(np.array(choice))
return child
def genetic_reproduction(parents_pool):
# every pair of parents will produce a mixed child
new_pop = []
for [p1,p2] in parents_pool:
W1_kid = cross_mutate_genes(p1.W1, p2.W1)
W2_kid = cross_mutate_genes(p1.W2, p2.W2)
c_brain1 = Neural_Network(W1=W1_kid, W2=W2_kid)
c_brain2 = Neural_Network(W1=W1_kid, W2=W2_kid)
new_pop.append(c_brain1)
new_pop.append(c_brain2)
return new_pop