J'ai écrit le code suivant pour cette question où il y a deux couches de convolution (Conv1 et Conv2 en abrégé) et je voudrais tracer toutes les sorties de chaque couche (c'est autonome). Tout va bien pour Conv1, mais il me manque quelque chose à propos de Conv2. J'alimente une image 1x1x25x25 (images num, canaux num, hauteur, largeur (mes conventions, ni convention TF ou Theano)) à Conv1 qui a quatre filtres 5x5. Cela signifie que sa forme de sortie est 4x1x1x25x25 (filtres num, images num, num canaux, hauteur, largeur), résultant en 4 graphiques.Visualisation des sorties de la couche de convolution Keras
Maintenant, cette sortie est envoyée à Conv1 qui a des filtres SIX 3x3. Par conséquent, la sortie de Conv2 devrait être 6x (4x1x1x25x25), mais ce n'est pas le cas! C'est plutôt 6x1x1x25x25. Cela signifie qu'il n'y a que 6 parcelles au lieu de 6x4, mais pourquoi? Les fonctions suivantes imprime également la forme de chaque sortie qu'ils sont
(1, 1, 25, 25, 4)
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(1, 1, 25, 25, 6)
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mais devraient être
(1, 1, 25, 25, 4)
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(1, 4, 25, 25, 6)
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droit?
import numpy as np
#%matplotlib inline #for Jupyter ONLY
import matplotlib.pyplot as plt
from keras.models import Sequential
from keras.layers import Conv2D
from keras import backend as K
model = Sequential()
# Conv1
conv1_filter_size = 5
model.add(Conv2D(nb_filter=4, nb_row=conv1_filter_size, nb_col=conv1_filter_size,
activation='relu',
border_mode='same',
input_shape=(25, 25, 1)))
# Conv2
conv2_filter_size = 3
model.add(Conv2D(nb_filter=6, nb_row=conv2_filter_size, nb_col=conv2_filter_size,
activation='relu',
border_mode='same'))
# The image to be sent through the model
img = np.array([
[[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.]],
[[1.],[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[0.],[1.],[0.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.],[1.]],
[[1.],[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[0.],[1.],[0.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[0.],[1.],[1.]],
[[1.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[1.]],
[[1.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[1.]],
[[1.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[1.]],
[[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.]],
[[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.]],
[[1.],[0.],[0.],[1.],[1.],[1.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[1.],[1.],[1.],[0.],[0.],[1.]],
[[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.]],
[[1.],[1.],[0.],[1.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[0.],[1.],[1.]],
[[1.],[1.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.],[1.]],
[[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[0.],[0.],[0.],[0.],[0.],[0.],[0.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.]],
[[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.],[1.]]])
def get_layer_outputs(image):
'''This function extracts the numerical output of each layer.'''
outputs = [layer.output for layer in model.layers]
comp_graph = [K.function([model.input] + [K.learning_phase()], [output]) for output in outputs]
# Feeding the image
layer_outputs_list = [op([[image]]) for op in comp_graph]
layer_outputs = []
for layer_output in layer_outputs_list:
print(np.array(layer_output).shape, end='\n-------------------\n')
layer_outputs.append(layer_output[0][0])
return layer_outputs
def plot_layer_outputs(image, layer_number):
'''This function handels plotting of the layers'''
layer_outputs = get_layer_outputs(image)
x_max = layer_outputs[layer_number].shape[0]
y_max = layer_outputs[layer_number].shape[1]
n = layer_outputs[layer_number].shape[2]
L = []
for i in range(n):
L.append(np.zeros((x_max, y_max)))
for i in range(n):
for x in range(x_max):
for y in range(y_max):
L[i][x][y] = layer_outputs[layer_number][x][y][i]
for img in L:
plt.figure()
plt.imshow(img, interpolation='nearest')
plot_layer_outputs(img, 1)
Si vous connaissez des références, s'il vous plaît partager. – Miladiouss