ValueError: no signature found for builtin - cyfunction get_Model.locals.lambda

问题背景

使用cython编译keras工程，编译完成后运行时报错

问题原因

神经网络中存在keras.layers.Lambda层，对于构造参数function的lambda表示，cython无法读取为正常属性

问题代码及解决

# RNN layer
lstm_1= LSTM(32, return_sequences=True, kernel_initializer='he_normal', name='lstm1')(inner)
lstm_1b= LSTM(32, return_sequences=True, go_backwards=True, kernel_initializer='he_normal',name='lstm1_b')(inner)# (None, 64, 32)# 此处为原代码，编译为pyd后执行报错# reversed_lstm_1b = Lambda(function = lambda inputTensor: K.reverse(inputTensor, axes = 1))(lstm_1b)defrev(inputTensor):return K.reverse(inputTensor, axes=1)
reversed_lstm_1b= Lambda(function= rev)(lstm_1b)
lstm1_merged= concatenate([lstm_1, reversed_lstm_1b])# (None, 64, 64)
lstm1_merged= BatchNormalization()(lstm1_merged)

代码及解决

我是编译为.so后，调用出错
原码

KL.Lambda(lambda t: tf.reshape(t,[tf.shape(t)[0],-1,2]))(x)

改为

defrpn_class_lambda(t):return tf.reshape(t,[tf.shape(t)[0],-1,2])

KL.Lambda(
        function= rpn_class_lambda)(x)