1.https://blog.csdn.net/weixin_43112462/article/details/88669902
2.https://www.cnblogs.com/jclian91/p/9888381.html
3.https://www.cnblogs.com/dsgcBlogs/p/8619566.html (余弦相似度)
4.https://www.jianshu.com/p/4cbb94c2c4be (one-hot 和 TF-IDF)
5.https://blog.csdn.net/qq_16633405/article/details/80227805
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