中文说明：
自己编写的BP神经网络算法，算法简单易懂，输入实现全局归一化。该算法可以单独直接运行，也可以作为子函数调用。
English Description：
Self compiled BP neural network algorithm, the algorithm is simple and easy to understand, input to achieve global normalization. The algorithm can be run directly or called as a sub function.