说明：  bp神经网络源码,这是BP神经网络源码,包括神经网络的创建,权值的初始化和修正,阈值的初始化和修正,权值结果保存
(bp neural network source code, which is BP neural network source code, including the creation of neural networks, weights initialization and correction, threshold initialization and amendments, the right to preserve the value of the results)