When Retriever-Reader Meets Scenario-Based Multiple-Choice Questions
ZiXian Huang, Ao Wu, Yulin Shen, Gong Cheng, Yuzhong Qu
Abstract
Scenario-based question answering (SQA) requires retrieving and reading paragraphs from a large corpus to answer a question which is contextualized by a long scenario description. Since a scenario contains both keyphrases for retrieval and much noise, retrieval for SQA is extremely difficult. Moreover, it can hardly be supervised due to the lack of relevance labels of paragraphs for SQA. To meet the challenge, in this paper we propose a joint retriever-reader model called JEEVES where the retriever is implicitly supervised only using QA labels via a novel word weighting mechanism. JEEVES significantly outperforms a variety of strong baselines on multiple-choice questions in three SQA datasets.
BibTeX
@inproceedings{huang-etal-2021-retriever-reader,
title = "When Retriever-Reader Meets Scenario-Based Multiple-Choice Questions",
author = "Huang, ZiXian and
Wu, Ao and
Shen, Yulin and
Cheng, Gong and
Qu, Yuzhong",
editor = "Moens, Marie-Francine and
Huang, Xuanjing and
Specia, Lucia and
Yih, Scott Wen-tau",
booktitle = "Findings of the Association for Computational Linguistics: EMNLP 2021",
month = nov,
year = "2021",
address = "Punta Cana, Dominican Republic",
publisher = "Association for Computational Linguistics",
url = "https://aclanthology.org/2021.findings-emnlp.84/",
doi = "10.18653/v1/2021.findings-emnlp.84",
pages = "985--994"
}