中文说明：包内解压后含有两个程序，一个是带有归一化的双层BP神经网络，一个是不带归一化的双层BP 神经网络，其中需要输入的数据中第一列为要逼近的目标函数。反向的优化算法选项写在了BP.m文件中，使用时可以替换。BPp文件为带归一化的双层，EX为不带归一化的BP。
English Description：
After decompression, there are two programs in the package, one is the two-layer BP neural network with normalization, the other is the two-layer BP neural network without normalization. The first column of the input data is the objective function to be approximated. The reverse optimization algorithm options are written in the BP. M file and can be replaced when used. BPP file is a two-layer file with normalization, ex is a BP file without normalization.