good coding for beginner

网络爬虫编码，可爬取数据，可以用于初学者学习，具有较好的参考价值。-Network crawler coding, crawling data can be used for beginners to learn, with a good reference value.

稀疏编码图像分类, 稀疏表示创始人写的PPT,内容精彩,分析清晰,易于理解(sparse coding image classification, PPT written by the original author of sparse representation, the PPT content is easy to realize with clear illustration and analysis.)

matrix information on riemannian sparse coding