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Automatic question generation based on sentence structure analysis using machine learning approach

Published online by Cambridge University Press:  17 June 2021

Miroslav Blšták Open the ORCID record for Miroslav Blšták [Opens in a new window]  and
Viera Rozinajová
Miroslav Blšták*
Affiliation:
Kempelen Institute of Intelligent Technologies, Mlynske nivy 5, Bratislava, Slovakia
Viera Rozinajová
Affiliation:
Kempelen Institute of Intelligent Technologies, Mlynske nivy 5, Bratislava, Slovakia
*
*Corresponding author. E-mail: miroslav.blstak@kinit.sk
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Abstract

Automatic question generation is one of the most challenging tasks of Natural Language Processing. It requires “bidirectional” language processing: first, the system has to understand the input text (Natural Language Understanding), and it then has to generate questions also in the form of text (Natural Language Generation). In this article, we introduce our framework for generating the factual questions from unstructured text in the English language. It uses a combination of traditional linguistic approaches based on sentence patterns with several machine learning methods. We first obtain lexical, syntactic and semantic information from an input text, and we then construct a hierarchical set of patterns for each sentence. The set of features is extracted from the patterns, and it is then used for automated learning of new transformation rules. Our learning process is totally data-driven because the transformation rules are obtained from a set of initial sentence–question pairs. The advantages of this approach lie in a simple expansion of new transformation rules which allows us to generate various types of questions and also in the continuous improvement of the system by reinforcement learning. The framework also includes a question evaluation module which estimates the quality of generated questions. It serves as a filter for selecting the best questions and eliminating incorrect ones or duplicates. We have performed several experiments to evaluate the correctness of generated questions, and we have also compared our system with several state-of-the-art systems. Our results indicate that the quality of generated questions outperforms the state-of-the-art systems and our questions are also comparable to questions created by humans. We have also created and published an interface with all created data sets and evaluated questions, so it is possible to follow up on our work.

Keywords

Automatic question generationMachine learning
Type
Article
Information
Natural Language Engineering , Volume 28 , Issue 4 , July 2022 , pp. 487 - 517
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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