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Russian-Language Question Classification: A New Typology and First Results

Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10716)

Abstract

This paper deals with automatic classification of questions in the Russian language, a natural early step in building a question answering system. We developed a typology of Russian questions using interrogative particles, pronouns and word order as the main features. A corpus of 2008 questions was manually compiled and annotated according to our typology. We used a fine-grained class set and a coarse-grained one (23 and 14 classes, respectively). The training data, represented as character bi-/trigrams and word uni-/bi-/trigrams, was used to approach the task of question classification. We tested several widely used machine-learning methods (logistic regression, support vector machines, naïve Bayes) against a regular expression baseline on a held-out test corpus annotated by an external expert. The best results were achieved by a SVM classifier (linear kernel) that achieved the accuracy of 65.3% (fine-grained) and 68.7% (coarse-grained), while the baseline regular expression model showed 52.7% accuracy.

Keywords

Question answering Question answering systems QA systems Russian-language questions Question classification Question tagging Russian question typology 

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.National Research University Higher School of EconomicsNizhny NovgorodRussia

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