说明：  基本bp神经网络算法和改进型bp神经网络算法都是我改写完成的算法，是网上到处传播的一个c++ bp神经网络算法改写的，由于网上的那个算法编译会出现若干百个错误，在其基础上重新编写和改进，写出了这两个算法
(bp basic neural network algorithms and improved neural network algorithm bp I are complete rewrite the algorithm, the Internet is spreading everywhere, a c bp neural network algorithm rewrite the Internet that the algorithm will build several hundred mistakes, on the basis of its rewrite and improve, and wrote a This algorithm 2)