HiExpan: Task-Guided Taxonomy Construction By Hierarchical Tree Expansion

Authors:
Jiaming Shen University of Illinois at Urbana-Champaign
Zeqiu Wu University of Illinois at Urbana-Champaign
Dongming Lei University of Illinois at Urbana-Champaign
Chao Zhang University of Illinois at Urbana-Champaign
Xiang Ren University of Southern California
Michelle T. Vanni U.S. Army Research Laboratory
Brain M. Sadler U.S. Army Research Laboratory
Jiawei Han University of Illinois at Urbana-Champaign

Introduction:

This paper studies Taxonomies. The authors aim to construct a task-guided taxonomy from a domain-specific corpus, and allow users to input a seed taxonomy. They propose an expansion-based taxonomy construction framework, namely HiExpan.

Abstract:

Taxonomies are of great value to many knowledge-rich applications. As the manual taxonomy curation costs enormous human effects, automatic taxonomy construction is in great demand. However, most existing automatic taxonomy construction methods can only build hypernymy taxonomies wherein each edge is limited to expressing the is-a relation. Such a restriction limits their applicability to more diverse real-world tasks where the parent-child may carry different relations. In this paper, we aim to construct a task-guided taxonomy from a domain-specific corpus, and allow users to input a seed taxonomy, serving as the task guidance. We propose an expansion-based taxonomy construction framework, namely HiExpan, which automatically generates key term list from the corpus and iteratively grows the seed taxonomy. Specifically, HiExpan views all children under each taxonomy node forming a coherent set and builds the taxonomy by recursively expanding all these sets. Furthermore, HiExpan incorporates a weakly-supervised relation extraction module to extract the initial children of a newly-expanded node and adjusts the taxonomy tree by optimizing its global structure. Our experiments on three real datasets from different domains demonstrate the effectiveness of HiExpan for building task-guided taxonomies.

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