特征选择

1.机器学习之特征选择方法 https://www.cnblogs.com/bjwu/p/9103002.html

2. tf-idi(自动提取关键词）大神讲解http://www.ruanyifeng.com/blog/2013/03/tf-idf.html
3. 特征选择https://blog.csdn.net/coffee_cream/article/details/61423223
4. 特征选择常用算法综述https://www.cnblogs.com/heaad/archive/2011/01/02/1924088.html
5. tf idf公式及sklearn中TfidfVectorizer
   https://www.cnblogs.com/Rvin/p/10695477.html

6.TF-IDF计算与sklearn中CountVectorizer和TfidfTransformer使用https://blog.csdn.net/wf592523813/article/details/81911155

7. TfidfVectorizer参数解析https://blog.csdn.net/laobai1015/article/details/80451371