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ThinkMind // International Journal On Advances in Intelligent Systems, volume 5, numbers 3 and 4, 2012 // View article intsys_v5_n34_2012_4


Rich Annotation Guided Learning

Authors:
Xiang Li
Heng Ji
Faisal Farooq
Hao Li
Wen-Pin Lin
Shipeng Yu

Keywords: rich annotation; feature engineering

Abstract:
Supervised learning methods rely heavily on the quantity and quality of annotations provided by humans. As more natural language processing systems utilize human labeled data, it becomes beneficial to discover some hidden privileged knowledge from human annotators. In a traditional framework, a human annotator and a system are treated as isolated black-boxes. We propose better utilization of the valuable knowledge possessed by human annotators in the system development. This can be achieved by asking annotators to provide "rich annotations" for feature encoding. The rich annotations can come at multiple levels such as highlighting and generalizing contexts, and providing high-level comments. We propose a general framework to exploit such rich annotations from human annotators. This framework is a novel extension of our previous work by adding two more levels of rich annotations and two more systematic case studies. To demonstrate the power, generality and scalability of this approach, we apply the method in four very different applications in various domains: medical concept extraction, name translation, residence slot filling and event modality detection. Since richer annotations come at a higher cost (for example, take more time), we investigated the trade-off between system performance and annotation cost, when adding rich annotations from various levels. Experiments showed that the systems trained from rich annotations can save up to 65% annotation cost in order to obtain the same performance as using basic annotations. Our approach is able to bridge the gap between human annotators and systems in a seamless manner and achieve significant absolute improvement (6% - 15%) over state-of-the-art systems for all of these applications.

Pages: 261 to 277

Copyright: Copyright (c) to authors, 2012. Used with permission.

Publication date: December 31, 2012

Published in: journal

ISSN: 1942-2679

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