两级前馈神经网络训练的M文件代码，代码后都有注释，用户只需修改训练条件以及前面需要训练的数据即可，是典型的神经网络，下载后直接复制到M文件即可运行成功！是学习神经网络控制的必备-Two feed-forward neural network training M-file code, code has a comment, users only need to modify the training conditions and the need to train before the data