Multi-Hop Question Generation via Dual-Perspective Keyword Guidance

TL;DR

This paper introduces a dual-perspective keyword-guided framework for multi-hop question generation, effectively utilizing question and document keywords to improve the quality and relevance of generated questions.

Contribution

It proposes a novel DPKG framework that integrates question and document keywords into the multi-hop question generation process, addressing limitations of previous keyword utilization.

Findings

Enhanced question relevance and accuracy in generated questions

Improved performance over existing MQG methods

Effective use of dual-perspective keywords in transformer models

Abstract

Multi-hop question generation (MQG) aims to generate questions that require synthesizing multiple information snippets from documents to derive target answers. The primary challenge lies in effectively pinpointing crucial information snippets related to question-answer (QA) pairs, typically relying on keywords. However, existing works fail to fully utilize the guiding potential of keywords and neglect to differentiate the distinct roles of question-specific and document-specific keywords. To address this, we define dual-perspective keywords (i.e., question and document keywords) and propose a Dual-Perspective Keyword-Guided (DPKG) framework, which seamlessly integrates keywords into the multi-hop question generation process. We argue that question keywords capture the questioner's intent, whereas document keywords reflect the content related to the QA pair. Functionally, question and document keywords work together to pinpoint essential information snippets in the document, with question keywords required to appear in the generated question. The DPKG framework consists of an expanded transformer encoder and two answer-aware transformer decoders for keyword and question generation, respectively. Extensive experiments demonstrate the effectiveness of our work, showcasing its promising performance and underscoring its significant value in the MQG task.