Learning Question Classifiers

9 years 7 months ago
Learning Question Classifiers
In order to respond correctly to a free form factual question given a large collection of texts, one needs to understand the question to a level that allows determining some of the constraints the question imposes on a possible answer. These constraints may include a semantic classification of the sought after answer and may even suggest using different strategies when looking for and verifying a candidate answer. This paper presents a machine learning approach to question classification. We learn a hierarchical classifier that is guided by a layered semantic hierarchy of answer types, and eventually classifies questions into finegrained classes. We show accurate results on a large collection of free-form questions used in TREC 10.
Xin Li, Dan Roth
Added 17 Dec 2010
Updated 17 Dec 2010
Type Journal
Year 2002
Authors Xin Li, Dan Roth
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