我的双向网络出现错误
model = Sequential()
model.add( Bidirectional(LSTM(units = 128, return_sequences = True),
input_shape = input_shape[1:]) )
#model.add( Bidirectional(LSTM(64, return_sequences = True) ))
model.add( TimeDistributed(Dense(units = language_vocab_size,
activation = 'softmax')) )
learning_rate = 0.01
model.compile(loss=sparse_categorical_crossentropy,
optimizer=Adam(learning_rate),
metrics=['accuracy'])
return model
返回的错误是:
TypeError:+不支持的操作数类型:“ NoneType”和“ int”
究竟是什么导致此错误?