--Tensorflow a implémenté CNN une fois, mais cette fois je l'ai implémenté avec un framework appelé Keras, qui semble être le plus apprécié. ――Lorsque j'ai essayé de l'utiliser, il contenait diverses bibliothèques plus pratiques que Tensorflow, et c'était comme si c'était facile à implémenter. ―― La raison en est que le traitement détaillé du calcul est apparemment en boîte noire, il semble donc que vous puissiez le comprendre sans y penser, mais il semble que vous ne puissiez pas faire de réglage fin.
https://github.com/aidiary/keras-examples/blob/master/cnn/cifar10/cifar10.py
--Seules les principales sont répertoriées.
| # | OS/Logiciel/Bibliothèque | version |
|---|---|---|
| 1 | Mac OS X | EI Capitan |
| 2 | Python | 3.Série 6 |
| 3 | NumPy | 1.Série 13 |
| 4 | Keras | 1.2 système |
train.py
#!/usr/local/bin/python3
#!-*- coding: utf-8 -*-
import os
import numpy as np
from scipy.misc import toimage
import matplotlib.pyplot as plt
from keras.datasets import cifar10
from keras.utils import np_utils
from keras.models import Sequential
from keras.layers import Dense, Dropout, Activation, Flatten
from keras.layers import Convolution2D, MaxPooling2D
from keras.utils.visualize_util import plot
def cnn_model(X_train, nb_classes):
model = Sequential()
model.add(Convolution2D(32, 3, 3, border_mode='same', input_shape=X_train.shape[1:]))
model.add(Activation('relu'))
model.add(Convolution2D(32, 3, 3))
model.add(Activation('relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Dropout(0.25))
model.add(Convolution2D(64, 3, 3, border_mode='same'))
model.add(Activation('relu'))
model.add(Convolution2D(64, 3, 3))
model.add(Activation('relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Dropout(0.25))
model.add(Flatten())
model.add(Dense(512))
model.add(Activation('relu'))
model.add(Dropout(0.5))
model.add(Dense(nb_classes))
model.add(Activation('softmax'))
model.compile(
loss='categorical_crossentropy',
optimizer='adam',
metrics=['accuracy']
)
return model
def plot_cifar10(X, y, result_dir):
plt.figure()
#Dessiner une image
nclasses = 10
pos = 1
for targetClass in range(nclasses):
targetIdx = []
#Obtenir la liste d'index des images de la classe classID
for i in range(len(y)):
if y[i][0] == targetClass:
targetIdx.append(i)
#Dessinez les 10 premières images sélectionnées au hasard dans chaque classe
np.random.shuffle(targetIdx)
for idx in targetIdx[:10]:
img = toimage(X[idx])
plt.subplot(10, 10, pos)
plt.imshow(img)
plt.axis('off')
pos += 1
plt.savefig(os.path.join(result_dir, 'plot.png'))
def save_history(history, result_file):
loss = history.history['loss']
acc = history.history['acc']
val_loss = history.history['val_loss']
val_acc = history.history['val_acc']
nb_epoch = len(acc)
with open(result_file, "w") as fp:
fp.write("epoch\tloss\tacc\tval_loss\tval_acc\n")
for i in range(nb_epoch):
fp.write("%d\t%f\t%f\t%f\t%f\n" % (i, loss[i], acc[i], val_loss[i], val_acc[i]))
if __name__ == '__main__':
#Nombre d'essais de formation à l'apprentissage des données
nb_epoch = 100
#Répertoire de stockage des résultats d'apprentissage
result_dir = '{Enregistrer le chemin du répertoire}'
#Combien d'images à utiliser dans une étude
batch_size = 128
#Nombre d'étiquettes d'identification
nb_classes = 10
#Dimensions de l'image d'entrée
img_rows, img_cols = 32, 32
#Nombre de canaux (3 car c'est RVB)
img_channels = 3
# CIFAR-10 Charger les données
# (nb_samples, nb_rows, nb_cols, nb_channel) = tf
(X_train, y_train), (X_test, y_test) = cifar10.load_data()
#Tracer des images au hasard
plot_cifar10(X_train, y_train, result_dir)
#La valeur du pixel est 0-Convertir en 1
X_train = X_train.astype('float32')
X_test = X_test.astype('float32')
X_train /= 255.0
X_test /= 255.0
#Libellé de classe (0-9) un-Convertir au format d'encodage à chaud
Y_train = np_utils.to_categorical(y_train, nb_classes)
Y_test = np_utils.to_categorical(y_test, nb_classes)
#modèle
model = cnn_model(X_train, nb_classes)
#Voir le résumé du modèle
model.summary()
plot(model, show_shapes=True, to_file=os.path.join(result_dir, 'model.png'))
#Apprentissage
history = model.fit(
X_train,
Y_train,
batch_size=batch_size,
nb_epoch=nb_epoch,
verbose=1,
validation_data=(X_test, Y_test),
shuffle=True
)
#Sauvegardez les modèles, les poids et l'historique appris
model_json = model.to_json()
with open(os.path.join(result_dir, 'model.json'), 'w') as json_file:
json_file.write(model_json)
model.save_weights(os.path.join(result_dir, 'model.h5'))
save_history(history, os.path.join(result_dir, 'history.txt'))
#Évaluation du modèle
loss, acc = model.evaluate(X_test, Y_test, verbose=0)
print('Test loss:', loss)
print('Test acc:', acc)
--Une interface utilisateur vraiment facile à comprendre.
Using TensorFlow backend.
____________________________________________________________________________________________________
Layer (type) Output Shape Param # Connected to
====================================================================================================
convolution2d_1 (Convolution2D) (None, 32, 32, 32) 896 convolution2d_input_1[0][0]
____________________________________________________________________________________________________
activation_1 (Activation) (None, 32, 32, 32) 0 convolution2d_1[0][0]
____________________________________________________________________________________________________
convolution2d_2 (Convolution2D) (None, 30, 30, 32) 9248 activation_1[0][0]
____________________________________________________________________________________________________
activation_2 (Activation) (None, 30, 30, 32) 0 convolution2d_2[0][0]
____________________________________________________________________________________________________
maxpooling2d_1 (MaxPooling2D) (None, 15, 15, 32) 0 activation_2[0][0]
____________________________________________________________________________________________________
dropout_1 (Dropout) (None, 15, 15, 32) 0 maxpooling2d_1[0][0]
____________________________________________________________________________________________________
convolution2d_3 (Convolution2D) (None, 15, 15, 64) 18496 dropout_1[0][0]
____________________________________________________________________________________________________
activation_3 (Activation) (None, 15, 15, 64) 0 convolution2d_3[0][0]
____________________________________________________________________________________________________
convolution2d_4 (Convolution2D) (None, 13, 13, 64) 36928 activation_3[0][0]
____________________________________________________________________________________________________
activation_4 (Activation) (None, 13, 13, 64) 0 convolution2d_4[0][0]
____________________________________________________________________________________________________
maxpooling2d_2 (MaxPooling2D) (None, 6, 6, 64) 0 activation_4[0][0]
____________________________________________________________________________________________________
dropout_2 (Dropout) (None, 6, 6, 64) 0 maxpooling2d_2[0][0]
____________________________________________________________________________________________________
flatten_1 (Flatten) (None, 2304) 0 dropout_2[0][0]
____________________________________________________________________________________________________
dense_1 (Dense) (None, 512) 1180160 flatten_1[0][0]
____________________________________________________________________________________________________
activation_5 (Activation) (None, 512) 0 dense_1[0][0]
____________________________________________________________________________________________________
dropout_3 (Dropout) (None, 512) 0 activation_5[0][0]
____________________________________________________________________________________________________
dense_2 (Dense) (None, 10) 5130 dropout_3[0][0]
____________________________________________________________________________________________________
activation_6 (Activation) (None, 10) 0 dense_2[0][0]
====================================================================================================
Total params: 1,250,858
Trainable params: 1,250,858
Non-trainable params: 0
____________________________________________________________________________________________________
Train on 50000 samples, validate on 10000 samples
Epoch 1/100
2017-08-29 11:55:15.047457: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use SSE4.2 instructions, but these are available on your machine and could speed up CPU computations.
2017-08-29 11:55:15.047489: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use AVX instructions, but these are available on your machine and could speed up CPU computations.
2017-08-29 11:55:15.047498: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use AVX2 instructions, but these are available on your machine and could speed up CPU computations.
2017-08-29 11:55:15.047505: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use FMA instructions, but these are available on your machine and could speed up CPU computations.
50000/50000 [==============================] - 400s - loss: 1.8624 - acc: 0.3123 - val_loss: 1.5157 - val_acc: 0.4537
Epoch 2/100
50000/50000 [==============================] - 455s - loss: 1.4213 - acc: 0.4825 - val_loss: 1.2090 - val_acc: 0.5645
Epoch 3/100
50000/50000 [==============================] - 384s - loss: 1.2453 - acc: 0.5549 - val_loss: 1.1120 - val_acc: 0.6004
Epoch 4/100
50000/50000 [==============================] - 414s - loss: 1.1602 - acc: 0.5869 - val_loss: 1.0376 - val_acc: 0.6304
Epoch 5/100
40960/50000 [=======================>......] - ETA: 64s - loss: 1.0852 - acc: 0.6156
――Enfin, c'est 0,795500, ce qui est tout à fait un nombre.
epoch loss acc val_loss val_acc
0 1.862381 0.312260 1.515693 0.453700
1 1.421265 0.482520 1.209045 0.564500
2 1.245348 0.554880 1.111982 0.600400
3 1.160202 0.586880 1.037605 0.630400
4 1.082496 0.616840 1.002439 0.646900
5 1.014772 0.638600 0.921932 0.676100
6 0.968752 0.657040 0.890589 0.690000
7 0.933635 0.667640 0.854735 0.701200
8 0.893519 0.686920 0.841952 0.705100
9 0.866928 0.692880 0.832813 0.706700
10 0.835548 0.706200 0.808762 0.713600
11 0.811907 0.714380 0.790619 0.721300
12 0.787855 0.723800 0.769006 0.730800
13 0.769309 0.728920 0.757458 0.733200
14 0.749378 0.735600 0.731948 0.745700
15 0.729672 0.741200 0.707380 0.753900
16 0.711307 0.747860 0.720168 0.749600
17 0.694116 0.753920 0.690921 0.760300
18 0.685302 0.756300 0.688788 0.762900
19 0.670361 0.763320 0.699074 0.758100
20 0.655677 0.765700 0.683461 0.762800
21 0.650073 0.772340 0.675608 0.764000
22 0.637535 0.772880 0.705318 0.756400
23 0.627683 0.778300 0.659172 0.769500
24 0.608234 0.784560 0.649584 0.777400
25 0.605251 0.785540 0.670669 0.769400
26 0.604372 0.784440 0.657858 0.771600
27 0.591194 0.790200 0.648238 0.777000
28 0.583359 0.792300 0.644217 0.779500
29 0.579536 0.794680 0.654746 0.779200
30 0.577020 0.796780 0.650456 0.776600
31 0.558436 0.801840 0.654724 0.771200
32 0.551728 0.802580 0.660091 0.776500
33 0.551879 0.806080 0.691178 0.762100
34 0.551185 0.804320 0.643525 0.776900
35 0.537961 0.808680 0.648304 0.776100
36 0.538601 0.809580 0.663515 0.776100
37 0.526395 0.812180 0.667506 0.773200
38 0.520259 0.814020 0.637330 0.780900
39 0.520766 0.813460 0.626052 0.782500
40 0.513462 0.818240 0.637447 0.782200
41 0.508732 0.819540 0.628536 0.784700
42 0.512045 0.816880 0.648108 0.780600
43 0.502967 0.819200 0.681984 0.774500
44 0.502752 0.819600 0.626435 0.788800
45 0.506435 0.818640 0.641397 0.782800
46 0.492950 0.822220 0.643260 0.783700
47 0.490653 0.824700 0.652792 0.782700
48 0.479054 0.828640 0.641824 0.783700
49 0.483628 0.825200 0.636701 0.789600
50 0.483054 0.828940 0.635811 0.786600
51 0.472693 0.831800 0.628785 0.788600
52 0.473315 0.830320 0.630551 0.791700
53 0.466273 0.833520 0.636630 0.787100
54 0.466997 0.834320 0.627516 0.792000
55 0.467793 0.831500 0.641428 0.783800
56 0.456283 0.837320 0.635762 0.789500
57 0.452593 0.837640 0.636226 0.785800
58 0.459387 0.834740 0.628133 0.789200
59 0.450392 0.838600 0.651949 0.786700
60 0.446786 0.840840 0.628699 0.790300
61 0.443291 0.838820 0.635795 0.790300
62 0.445090 0.841860 0.630603 0.790400
63 0.438771 0.842060 0.618292 0.793700
64 0.444951 0.840980 0.631328 0.791900
65 0.443358 0.841860 0.631681 0.784200
66 0.436495 0.842280 0.640644 0.787600
67 0.434661 0.844800 0.625743 0.789400
68 0.431563 0.843140 0.633843 0.790500
69 0.430192 0.847000 0.642871 0.788800
70 0.421411 0.847940 0.624006 0.790100
71 0.423439 0.848720 0.650200 0.786900
72 0.420324 0.848240 0.654864 0.789300
73 0.421919 0.848480 0.627082 0.792700
74 0.410431 0.851180 0.642263 0.790100
75 0.419571 0.850860 0.636891 0.789100
76 0.413792 0.852300 0.653029 0.786400
77 0.415705 0.852520 0.644457 0.787400
78 0.423684 0.850840 0.631995 0.791600
79 0.410283 0.852720 0.652608 0.788600
80 0.411928 0.851480 0.634341 0.793000
81 0.405703 0.855640 0.630345 0.794300
82 0.408496 0.853320 0.652739 0.789500
83 0.402927 0.855320 0.642568 0.793900
84 0.404812 0.854160 0.637601 0.795100
85 0.400238 0.857520 0.633781 0.793700
86 0.403761 0.853880 0.625709 0.794700
87 0.404491 0.856420 0.635942 0.796500
88 0.392304 0.860800 0.636456 0.797500
89 0.398910 0.857180 0.655635 0.787900
90 0.392418 0.858680 0.634033 0.793500
91 0.390591 0.861520 0.627206 0.794700
92 0.385502 0.860740 0.657583 0.787700
93 0.391550 0.860260 0.664002 0.787900
94 0.388638 0.859500 0.648921 0.792000
95 0.385543 0.863360 0.644680 0.793800
96 0.386466 0.862720 0.648885 0.791200
97 0.384559 0.862300 0.651030 0.794400
98 0.384592 0.861200 0.629053 0.794900
99 0.388739 0.860320 0.634723 0.795500
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