TAILIEUCHUNG - Báo cáo khoa học: "Event Linking: Grounding Event Reference in a News Archive"

Interpreting news requires identifying its constituent events. Events are complex linguistically and ontologically, so disambiguating their reference is challenging. We introduce event linking, which canonically labels an event reference with the article where it was first reported. This implicitly relaxes coreference to co-reporting, and will practically enable augmenting news archives with semantic hyperlinks. | Event Linking Grounding Event Reference in a News Archive Joel Nothman and Matthew Honnibal and Ben Hachey and James R. Curran -lab School of IT University of Sydney NSW Australia Capital Markets CRC 55 Harrington St Sydney NSW Australia Department of Computing Macquarie University NSW Australia R D Thomson Reuters Corporation St. Paul MN USA joel james @ honnibal @ Abstract Interpreting news requires identifying its constituent events. Events are complex linguistically and ontologically so disambiguating their reference is challenging. We introduce event linking which canonically labels an event reference with the article where it was first reported. This implicitly relaxes coreference to co-reporting and will practically enable augmenting news archives with semantic hyperlinks. We annotate and analyse a corpus of 150 documents extracting 501 links to a news archive with reasonable inter-annotator agreement. 1 Introduction Interpreting news requires identifying its constituent events. Information extraction IE makes this feasible by considering only events of a specified type such as personnel succession or arrest Grishman and Sundheim 1996 LDC 2005 an approach not extensible to novel events or the same event types in sub-domains . sport. On the other hand topic detection and tracking TDT Allan 2002 disregards individual event mentions clustering together articles that share a topic. Between these fine and coarse-grained approaches event identification requires grouping references to the same event. However strict coreference is hampered by the complexity of event semantics poison murder and die may indicate the same effective event. The solution is to tag mentions with a canonical identifier for each news-triggering event. This paper introduces event linking given a past event reference in context find the article in a news archive that first reports that the event happened. 228 The task has an immediate practical application

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