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Perceptron
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# Script permettant de calculer les résultats de l'apprentissage d'un perceptron | |
# Ecrit dans le cadre de l'Ue Techniques d'Apprentissage Automatique du M2IA de Lyon 1 | |
# (parce que calculer à la main des sommes de multiplications avec des virgules, c'est rigolo 5 minutes, mais pas 6) | |
# Paramètres | |
base_dapprentissage = [ | |
(1, 6, 4, 1), | |
(1, 7, 5, 1), | |
(1, 11, 16, -1), | |
(1, 14, 11, -1), | |
(1, 16, 5, -1) | |
] | |
base_de_tests = [ | |
(1, 1, 2, 1), # 1 | |
(1, 2, 16, 1), #2 | |
(1, 4, 9, 1), #3 | |
(1, 8, 13, -1), #6 | |
(1, 9, 9, -1) #7 | |
] | |
poids = [10.0, 3.0, -2.0] | |
alpha = 0.1 | |
# Implémentation | |
nb_param = len(poids) | |
donnee_actuelle = 0 | |
def calculer_somme(vecteur_poids, transaction): | |
somme = 0 | |
for i in range(len(vecteur_poids)): | |
somme = somme + vecteur_poids[i] * transaction[i] | |
return somme | |
est_stable = False | |
nb_passe = -1 | |
while not est_stable: | |
nb_passe = nb_passe + 1 | |
est_stable = True | |
for i in range(len(base_dapprentissage)): | |
t = base_dapprentissage[i] | |
somme = calculer_somme(poids, t) | |
if (somme < 0 and t[-1] > 0) or (somme > 0 and t[-1] < 0): | |
est_stable = False | |
for i in range(nb_param): | |
poids[i] = poids[i] + t[-1] * t[i] * alpha | |
print("somme trouvée = " + str(somme) + " ; poids = " + str(poids)) | |
print("Nombre de passes instables sur les données : " + str(nb_passe)) | |
print("Poids finaux = " + str(poids)) | |
print("== Somme de la base d'apprentissage") | |
for t in base_dapprentissage: | |
somme = calculer_somme(poids, t) | |
print(somme) | |
print("== Analyse sur la base de tests") | |
matrice_confusion = [[0, 0], [0, 0]] | |
for t in base_de_tests: | |
somme = calculer_somme(poids, t) | |
print(str(t[-1]) + " / " + str(somme)) | |
pos_classe = 0 if t[-1] == 1 else 1 | |
pos_classe_predite = 0 if somme > 0 else 1 | |
matrice_confusion[pos_classe][pos_classe_predite] = matrice_confusion[pos_classe][pos_classe_predite] + 1 | |
print(matrice_confusion) |
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