BPnet

说明：  //1、动态改变学习速率 //2、加入动量项 //3、运用了Matcom4.5的矩阵运算库（可免费下载,头文件matlib.h)， // 方便矩阵运算,当然，也可自己写矩阵类 //4、可暂停运算 //5、可将网络以文件的形式保存、恢复(//1, dynamically changing learning rate// 2, adding momentum item// 3, the use of matrix operations Matcom4.5 library (available for free download, headers matlib.h),// ​ ​ to facilitate matrix operations, but may also write your own matrix class// 4, may suspend the operation// 5, the network can be saved as a file and restore)