BP神经网络C程序，在该题的程序设计中采用了文件相关的操作，记录了相关学习和测试信息数据。-BP neural network C program, use the file related operations in the program design of the subject, record related learning and testing information data.

人脸识别SDK 采用C++编写，支持两张照片进行比对1:1，以及1：N 人脸搜索，SDK内部自己维护人脸特征数据，支持增、删、查找等操作，上层应用程序只需要关注自己的业务逻辑即可(Face recognition SDK is written in C++, supporting two photos to compare 1:1, and 1:N face search. SDK maintains its face feature data internally, and supports