Using weak supervision to identify long-tail entities for knowledge base completion

Oulabi, Yaser ; Bizer, Christian

OulabiBizer2019weaksupervision.pdf - Published

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URN: urn:nbn:de:bsz:180-madoc-527597
Document Type: Conference or workshop publication
Year of publication: 2019
Book title: Semantic systems : The power of AI and knowledge graphs : 15th International Conference, SEMANTiCS 2019, Karlsruhe, Germany, September 9-12, 2019, proceedings
The title of a journal, publication series: Lecture Notes in Computer Science
Volume: 11702
Page range: 83-98
Conference title: SEMANTiCS 2019
Location of the conference venue: Karlsruhe, Germany
Date of the conference: Sept. 09-12, 2019
Publisher: Acosta, Maribel
Place of publication: Berlin [u.a.]
Publishing house: Springer
ISBN: 978-3-030-33219-8 , 978-3-030-33220-4
ISSN: 0302-9743 , 1611-3349
Publication language: English
Institution: School of Business Informatics and Mathematics > Information Systems V: Web-based Systems (Bizer 2012-)
License: CC BY 4.0 Creative Commons Attribution 4.0 International (CC BY 4.0)
Subject: 004 Computer science, internet
Keywords (English): Web Data Integration , Knowledge Base Augmentation , Long-Tail Entities , Weak Supervision , Bootstrapping , Cross-Domain Knowledge Bases , Web Tables
Abstract: Data from relational web tables can be used to augment cross-domain knowledge bases like DBpedia, Wikidata, or the Google Knowledge Graph with descriptions of entities that are not yet part of the knowledge base. Such long-tail entities can include for instance small villages, niche songs, or athletes that play in lower-level leagues. In previous work, we have presented an approach to successfully assemble descriptions of long-tail entities from relational HTML tables using supervised matching methods and manually labeled training data in the form of positive and negative entity matches. Manually labeling training data is a laborious task given knowledge bases covering many different classes. In this work, we investigate reducing the labeling effort for the task of long-tail entity extraction by using weak supervision. We present a bootstrapping approach that requires domain experts to provide a small set of simple, class-specific matching rules, instead of requiring them to label a large set of entity matches, thereby reducing the human supervision effort considerably. We evaluate this weak supervision approach and find that it performs only slightly worse compared to methods that rely on large sets of manually labeled entity matches.

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