... Weuse a linear, multi-class classifier with six kinds offeatures: words in the article title, words in thefirst sentence, words in the first sentence whichare direct objects to the verb ‘to ... approaches have been attempted:• Supervised learning of relation-specific ex-tractors (e.g., (Freitag, 1998)), and• “Open” IE — self-supervised learning ofunlexicalized, relation-independent ... PagesExtracon Learning Figure 1: Architecture of LUCHS. In order tohandle sparsity in its heuristically-generated train-ing data, LUCHS generates custom lexicon featureswhen learning each...