https://www.cnblogs.com/hapjin/p/8119797.html
https://blog.csdn.net/u013131218/article/details/50576324
http://www.cnblogs.com/wentingtu/archive/2012/04/07/2436583.html
https://www.datacamp.com/community/tutorials/text-analytics-beginners-nltk
一篇文章需要提取特征,以单词出现的频率作为特征,这种模型称之为“词袋模型”
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