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CLT seminar: Roberto Navigli – Multilinguality at Your Fingertips: BabelNet, Babelfy, Video Games with a Purpose and the Wikipedia Bitaxonomy

SEMINAR

Multilinguality is a key feature of today’s Web, and it is this feature that we leverage and exploit in our research work at the Sapienza University of Rome’s Linguistic Computing Laboratory, which I am going to overview and showcase in this talk.

I will start by presenting BabelNet 3.5, available at http://babelnet.org, a very large multilingual encyclopedic dictionary, semantic network and knowledge base, which covers 272 languages and provides both lexicographic and encyclopedic knowledge for all the open-class parts of speech, thanks to the seamless integration of WordNet, Wikipedia, Wiktionary, OmegaWiki, Wikidata, the Open Multilingual WordNet, GeoNames and other resources.

Next, I will present Babelfy, available at http://babelfy.org, a unified approach that leverages BabelNet to jointly perform word sense disambiguation and entity linking in arbitrary languages, with performance on both tasks on a par with, or surpassing, those of task-specific state-of-the-art supervised systems.

I will also describe the Wikipedia Bitaxonomy, available at http://wibitaxonomy.org, a new approach to the construction of two taxonomies for Wikipedia, that is, the largest and most accurate currently available taxonomy of Wikipedia pages and taxonomy of categories, aligned to each other.

Finally, I will introduce BabelTag, a new video game with a purpose for mobile phones made up of several mini-games, each of which contains a gamified annotation task (e.g. determine if the image depicts a concept; are two terms semantically related? etc.). The aim is, on the one hand, to engage players and, on the other, to validate and enrich BabelNet with accurate knowledge items.

This is joint work with many, many people: Francesco Cecconi, José Camacho Collados, Tiziano Flati, Andrea Moro, Tommaso Pasini, Simone Ponzetto, Alessandro Raganato, Daniele Vannella.

Bio:
Roberto Navigli is an Associate Professor in the Department of Computer Science of the Sapienza University of Rome. He was awarded the Marco Cadoli 2007 AIIA Prize for the best doctoral thesis in Artificial Intelligence and the Marco Somalvico 2013 AIIA Prize for the best young researcher in AI. He is the first Italian recipient of an ERC Starting Grant in computer science and informatics on multilingual word sense disambiguation (2011-2016), a co-PI of a Google Focused Research Award on Natural Language Understanding and a partner of the LIDER EU project.

His research lies in the field of Natural Language Processing (including multilingual word sense disambiguation and induction, multilingual entity linking, large-scale knowledge acquisition, ontology learning from scratch, open information extraction and relation extraction). He has served as an area chair of ACL, WWW, and *SEM, and a senior program committee member of IJCAI. Currently he is an Associate Editor of the Artificial Intelligence Journal, a member of the editorial board of the Journal of Natural Language Engineering, a guest editor of the Journal of Web Semantics, and a former editorial board member of Computational Linguistics.

Date: 2015-12-17 10:30 - 12:00

Location: L308, Lennart Torstenssonsgatan 8

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