程序实现的是二层BP网络,通过从文件中读入数据来构建网络,同时读入对应的样本进行学习,测试. ε=0.09 变量为max_error_tollerance forward_pass[]向前计算输出值 backward_pass[]向后调整权值 -Procedures for implementation of the BP network are two-story, read from the document into the data to build a netwo