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[英]MobileNet ValueError: Error when checking target: expected dense_1 to have 4 dimensions, but got array with shape (24, 2)
[英]ValueError: Error when checking target: expected dense_35 to have 4 dimensions, but got array with shape (1157, 1)
我有以下形状的训练和测试图像数据。
X_test.shape , y_test.shape , X_train.shape , y_train.shape
((277, 128, 128, 3), (277, 1), (1157, 128, 128, 3), (1157, 1))
我正在训练模特
def baseline_model():
filters = 100
model = Sequential()
model.add(Conv2D(filters, (3, 3), input_shape=(128, 128, 3), padding='same', activation='relu'))
#model.add(Dropout(0.2))
model.add(BatchNormalization())
model.add(Conv2D(filters, (3, 3), activation='relu', padding='same'))
model.add(BatchNormalization())
model.add(MaxPooling2D(pool_size=(2, 2)))
#model.add(Flatten())
model.add(Conv2D(filters, (3, 3), activation='relu', padding='same'))
model.add(BatchNormalization())
model.add(Conv2D(filters, (3, 3), activation='relu', padding='same'))
model.add(Activation('linear'))
model.add(BatchNormalization())
model.add(Dense(512, activation='relu'))
model.add(Dense(num_classes, activation='softmax'))
# Compile model
lrate = 0.01
epochs = 10
decay = lrate/epochs
sgd = SGD(lr=lrate, momentum=0.9, decay=decay, nesterov=False)
model.compile(loss='sparse_categorical_crossentropy', optimizer=sgd, metrics=['accuracy'])
print(model.summary())
return model
但我收到以下错误
检查目标时出错:预期density_35具有4维,但数组的形状为(1157,1)
尽管density_35需要提供4维数据,但是根据错误,网络将以2维数据作为标签矢量。
您可能忘记做的一件事是在第一个Dense
层之前添加Flatten
层:
model.add(BatchNormalization())
model.add(Flatten()) # flatten the output of previous layer before feeding it to Dense layer
model.add(Dense(512, activation='relu'))
之所以需要它,是因为Dense
层不会使输入变平。 而是将其应用于最后一个维度 。
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