2D Conditional Random Fields for Web information extraction

Authors:
Jun Zhu;Zaiqing Nie;Ji-Rong Wen;Bo Zhang;Wei-Ying Ma
Affiliations:
Microsoft Research Asia, Beijing, China;Tsinghua University, Beijing, China;Tsinghua University, Beijing, China;Microsoft Research Asia, Beijing, China;Tsinghua University, Beijing, China
Venue:
ICML '05 Proceedings of the 22nd international conference on Machine learning
Year:
2005

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Abstract

The Web contains an abundance of useful semistructured information about real world objects, and our empirical study shows that strong sequence characteristics exist for Web information about objects of the same type across different Web sites. Conditional Random Fields (CRFs) are the state of the art approaches taking the sequence characteristics to do better labeling. However, as the information on a Web page is two-dimensionally laid out, previous linear-chain CRFs have their limitations for Web information extraction. To better incorporate the two-dimensional neighborhood interactions, this paper presents a two-dimensional CRF model to automatically extract object information from the Web. We empirically compare the proposed model with existing linear-chain CRF models for product information extraction, and the results show the effectiveness of our model.