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Event Extraction from Unstructured Text Data

Part of the Lecture Notes in Computer Science book series (LNISA,volume 9261)


We extend a bootstrapping method that was initially developed for extracting relations from webpages to the problem of extracting content from large collections of short unstructured text. Such data appear as field notes in enterprise applications and as messages in social media services. The method iteratively learns sentence patterns that match a set of representative event mentions and then extracts different mentions using the learnt patterns. At every step, the semantic similarity between the text and set of patterns is used to determine if the pattern was matched. Semantic similarity is calculated using the WordNet lexical database. Local structure features such as bigrams are extracted where possible from the data to improve the accuracy of pattern matching. We rank and filter the learnt patterns to balance the precision and recall of the approach with respect to extracted events. We demonstrate this approach on two different datasets. One is a collection of field notes from an enterprise dataset. The other is a collection of “tweets” collected from the Twitter social network. We evaluate the accuracy of the extracted events when method parameters are varied.


  • Semantic Similarity
  • Content Extraction
  • Stop Word
  • Event Extraction
  • Relation Extraction

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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  • DOI: 10.1007/978-3-319-22849-5_38
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This work is supported by Chevron U.S.A. Inc. under the joint project, Center for Interactive Smart Oilfield Technologies (CiSoft), at the University of Southern California.

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Correspondence to Anand Panangadan .

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Shang, C., Panangadan, A., Prasanna, V.K. (2015). Event Extraction from Unstructured Text Data. In: Chen, Q., Hameurlain, A., Toumani, F., Wagner, R., Decker, H. (eds) Database and Expert Systems Applications. Globe DEXA 2015 2015. Lecture Notes in Computer Science(), vol 9261. Springer, Cham.

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