bp神经网络，两个输入，一个输出。并且代入检测数据。获得神经网络预测值和检测值之间的差值，在时域上，将差值的变化值也一并获得。-bp neural network, two inputs and one output. And substituting the test data. Neural network prediction obtain a difference value and the detected values, in the time domain, the difference between the change in value also be obtained.