Update machine-learning.md

sunnn · Jul 15, 2014 · 1cd03af · 1cd03af
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 ### Features
 
-* [tf-idf: text feature extraction](http://pyevolve.sourceforge.net/wordpress/?p=1589)
+* [tf-idf: text feature extraction](http://pyevolve.sourceforge.net/wordpress/?p=1589) [```scikit tf=idf```](http://stackoverflow.com/questions/8897593/similarity-between-two-text-documents)
 
 ### Models & Methods