Adaboost的C实现，在原始代码上做了一点小修改，另外加上了详细的注释，能够帮助初学者更好地理解分类器具体如何学习与选择的-Adaboost C implementation, the source code to do a little modification, plus detailed notes, can help beginners to better understand the specifics of how learning and classifier selection