CoRel: Seed-Guided Topical Taxonomy Construction by Concept Learning and Relation Transferring
Jiaxin Huang: University of Illinois at Urbana-Champaign; Yiqing Xie: The Hong Kong University of Science and Technology; Yu Meng: University of Illinois at Urbana-Champaign; Yunyi Zhang: University of Illinois at Urbana-Champaign; Jiawei Han: University of Illinois at Urbana-Champaign
Taxonomy is not only a fundamental form of knowledge representation, but also crucial to vast knowledge-rich applications, such as question answering and web search. Most existing taxonomy construction methods extract hypernym-hyponym entity pairs to organize a “universal” taxonomy. However, these generic taxonomies cannot satisfy user’s specific interest in certain areas and relations. Moreover, the nature of instance taxonomy treats each node as a single word, which has low semantic coverage for people to fully understand. In this paper, we propose a method for seed-guided topical taxonomy construction, which takes a corpus and a seed taxonomy described by concept names as input, and constructs a more complete taxonomy based on user’s interest, wherein each node is represented by a cluster of coherent terms. Our framework, CoRel, has two modules to fulfill this goal. A relation transferring module learns and transfers the user’s interested relation along multiple paths to expand the seed taxonomy structure in width and depth. A concept learning module enriches the semantics of each concept node by jointly embedding the taxonomy and text. Comprehensive experiments conducted on real-world datasets show that CoRel generates high-quality topical taxonomies and outperforms all the baselines significantly.
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