Event extraction from Twitter using Non-Parametric Bayesian Mixture Model with Word Embeddings

Deyu Zhou, Xuan Zhang, Yulan He


Abstract
To extract structured representations of newsworthy events from Twitter, unsupervised models typically assume that tweets involving the same named entities and expressed using similar words are likely to belong to the same event. Hence, they group tweets into clusters based on the co-occurrence patterns of named entities and topical keywords. However, there are two main limitations. First, they require the number of events to be known beforehand, which is not realistic in practical applications. Second, they don’t recognise that the same named entity might be referred to by multiple mentions and tweets using different mentions would be wrongly assigned to different events. To overcome these limitations, we propose a non-parametric Bayesian mixture model with word embeddings for event extraction, in which the number of events can be inferred automatically and the issue of lexical variations for the same named entity can be dealt with properly. Our model has been evaluated on three datasets with sizes ranging between 2,499 and over 60 million tweets. Experimental results show that our model outperforms the baseline approach on all datasets by 5-8% in F-measure.
Anthology ID:
E17-1076
Volume:
Proceedings of the 15th Conference of the European Chapter of the Association for Computational Linguistics: Volume 1, Long Papers
Month:
April
Year:
2017
Address:
Valencia, Spain
Venue:
EACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
808–817
Language:
URL:
https://aclanthology.org/E17-1076
DOI:
Bibkey:
Cite (ACL):
Deyu Zhou, Xuan Zhang, and Yulan He. 2017. Event extraction from Twitter using Non-Parametric Bayesian Mixture Model with Word Embeddings. In Proceedings of the 15th Conference of the European Chapter of the Association for Computational Linguistics: Volume 1, Long Papers, pages 808–817, Valencia, Spain. Association for Computational Linguistics.
Cite (Informal):
Event extraction from Twitter using Non-Parametric Bayesian Mixture Model with Word Embeddings (Zhou et al., EACL 2017)
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PDF:
https://aclanthology.org/E17-1076.pdf