Some fairly widely-used techniques include LSI, LDA, and word2vec or doc2vec. There a lot of different techniques out there! I'm one of the creators of Tagger N

Some fairly widely-used techniques include LSI, LDA, and word2vec or doc2vec. There a lot of different techniques out there! I'm one of the creators of Tagger News, and we used LDA with python's Gensim package. Here's a good tutorial: https://radimrehurek.com/gensim/tut2.html https://radimrehurek.com/gensim/tut2.html