RNN从哪里获取批量大小?

我正在通过以下方式培训RNN:

def create_rnn_model(stateful,length):
    model = Sequential()
    model.add(SimpleRNN(20,return_sequences=False,stateful=stateful,batch_input_shape=(1,length,1)))
    adam = optimizers.Adam(lr=0.001)
    model.add(Dense(1))
    model.compile(loss='mean_absolute_error', optimizer=adam, metrics=[root_mean_squared_error])
    print(model.summary())
    return model

和适合的

model_info = model_rnn_stateful.fit(x=x_train, y=y_train, validation_data=(x_test, y_test), batch_size=1, epochs=10,verbose=1)

预测

predicted_rnn_stateful = model_rnn_stateful.predict(x_test)

但当我预测的时候就会出错

可除以批量大小的样本数。发现:200 样品。批量:32。

编辑