Automatic identification of locative expressions from informal text
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2013
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Melbourne Authors
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Department of Computing and Information Systems, Melbourne School of Engineering
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Masters by Coursework & Shorter thesis
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Liu, F. (2013). Automatic identification of locative expressions from informal text. Masters by Coursework & Shorter thesis, Department of Computing and Information Systems, Melbourne School of Engineering, The University of Melbourne.
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Open Access
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© 2013 Fei Liu
Abstract
Informal place descriptions that are rich in locative expressions can be found in various contexts. The ability to extract locative expressions from such informal place descriptions is at the centre of improving the quality of services, such as interpreting geographical queries and emergency calls. While much attention has been focused on the identification of formal place references (e.g., Rathmines Road) from natu- ral language, people tend to make heavy use of informal place references (e.g., my bedroom).
This research addresses the problem by developing a model that is able to automatically identify locative expressions from informal text. Moreover, we study and discover insights of what aspects are helpful in the identification task.
Utilising an existing manually annotated corpus, we re-annotate locative expressions and use them as the gold standard. Having the gold standard ready, we take a machine learning approach to the identification task with well-reasoned features based on observation and intuition. Further, we study the impacts of various feature setups on the performance of the model and provide analyses of experiment results. With the best performing feature setup, the model is able to achieve significant increase in performance over the baseline systems.
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Keywords
locative expression identification, natural language processing, machine learning