我正在尝试将 VGG16 网络用于多个输入图像。
使用具有 2 个输入的简单 CNN 训练该模型给了我一个 acc。大约 50%,这就是为什么我想使用 VGG16 这样的既定模型进行尝试。
这是我尝试过的:
# imports
from keras.applications.vgg16 import VGG16
from keras.models import Model
from keras.layers import Conv2D, MaxPooling2D, Activation, Dropout, Flatten, Dense
def def_model():
model = VGG16(include_top=False, input_shape=(224, 224, 3))
# mark loaded layers as not trainable
for layer in model.layers:
layer.trainable = False
# return last pooling layer
pool_layer = model.layers[-1].output
return pool_layer
m1 = def_model()
m2 = def_model()
m3 = def_model()
# add classifier layers
merge = concatenate([m1, m2, m3])
# optinal_conv = Conv2D(64, (3, 3), activation='relu', padding='same')(merge)
# optinal_pool = MaxPooling2D(pool_size=(2, 2))(optinal_conv)
# flatten = Flatten()(optinal_pool)
flatten = Flatten()(merge)
dense1 = Dense(512, activation='relu')(flatten)
dense2 = Dropout(0.5)(dense1)
output = Dense(1, activation='sigmoid')(dense2)
inshape1 = Input(shape=(224, 224, 3))
inshape2 = Input(shape=(224, 224, 3))
inshape3 = Input(shape=(224, 224, 3))
model = Model(inputs=[inshape1, inshape2, inshape3], outputs=output)
- 我在调用时收到此错误
Model
功能。
ValueError: Graph disconnected: cannot obtain value for tensor Tensor("input_21:0", shape=(?, 224, 224, 3), dtype=float32) at layer "input_21". The following previous layers were accessed without issue: []`
我知道该图是断开的,但我找不到哪里。
这里有compile
and fit
功能。
# compile model
model.compile(optimizer="Adam", loss='binary_crossentropy', metrics=['accuracy'])
model.fit([train1, train2, train3], train,
validation_data=([test1, test2, test3], ytest))
- 我对某些行发表了评论:
optinal_conv
and optinal_pool
。应用后可能有什么效果Conv2D
and MaxPooling2D
之后concatenate
功能?