我正在尝试构建一个模型来着色图像。我正在使用LAB色彩空间。模型的输入是L通道，并且要训练模型以预测A和B通道。我希望通过几个卷积运行L通道，然后将其拆分为另外两个独立计算A和B通道的模型。最后，我想将它们合并在一起以获得输出。
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当我尝试创建合并图层时出现以下错误。
model = Sequential()
model.add(InputLayer((1, H, W)))
model.add(Convolution2D(64, 5, 5, border_mode = 'same', activation = 'relu'))
model.add(Convolution2D(64, 5, 5, border_mode = 'same', activation = 'relu'))
last = Convolution2D(64, 5, 5, border_mode = 'same', activation = 'relu')
model.add(last)
a_model = Sequential()
a_model.add(last)
a_model.add(Convolution2D(64, 5, 5, border_mode = 'same', activation = 'relu'))
a_model.add(Convolution2D(64, 5, 5, border_mode = 'same', activation = 'relu'))
a_model.add(Convolution2D(1, 3, 3, border_mode = 'same', activation = 'sigmoid'))
b_model = Sequential()
b_model.add(last)
b_model.add(Convolution2D(64, 5, 5, border_mode = 'same', activation = 'relu'))
b_model.add(Convolution2D(64, 5, 5, border_mode = 'same', activation = 'relu'))
b_model.add(Convolution2D(1, 3, 3, border_mode = 'same', activation = 'sigmoid'))
model.add(Merge((a_model, b_model), mode = 'concat'))
我希望模型的外观为（2，H，W），其中H和W是图像的高度和宽度。