The extractive summarization methods are typically unsupervised, for example Luhn (Luhn, 1958), Latent Se-mantic Analysis (Steinberger and Ježek, 2004), LexRank (Erkan and Radev, 2004), TextRank (Mihalcea and Tarau, 2004), SumBasic (Vanderwende et al., 2007) or KL-Sum (Haghighi and Vanderwende, 2009).
very good results in extractive summarization were achieved recently with recurrent neural networks Nallapati et al., 2016b;Nallapati et al., 2017).