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Agata Cybulska, Piek Vossen Computational Lexicology and Terminology
Lab, Faculty of Arts, Free University Amsterdam
Historical Event Extraction from Text
ACL LaTeCH 2011
Museum Application of the Historical Event Extraction Module
Browsing exhibits of the Rijksmuseum through historical events eg.photo’s related to the Bosnian War
and more…
ACL LaTeCH 2011
Location
Participants
Time
Actions
Modeling Historical Events in Text
HISTORICALEVENT
Srebrenica
Bosnian soldiersMoslim man and boys
On 11 July 1995
murder
Museum Application of the Historical Event Extraction Module
Browsing exhibits of the Rijksmuseum through historical events eg.- photo’s related to the Bosnian War- art pieces referring to a president, general etc.- within a time periode- geographic area
-> inferences aboutevent parts
-> relations between events
ACL LaTeCH 2011
5
Development of the Historical Event Extraction Module
No annotated data available
Our approach - development set of (only!) 5 texts manually annotated with Historical Events
Event extraction based on patterns of structural and semantic properties
ACL LaTeCH 2011
6
Comparison with an evaluation set tagged by two Independent annotators
MeasurementRelations
Gold Standard Triplets
System Triplets
Correct System Triplets
Recall %
Precision %
Time 17 20 13 76% 65%
Location 31 23 10 32% 43%
Participant 98 95 57 58% 60%
Evaluation Results
•Actions extracted with 67.94% recall and 51.96% precision
ACL LaTeCH 2011
How did we manage to achieve such good resultsusing only a very limited set of annotated data?
ACL LaTeCH 2011
How did we do it ??
