A Joint Model for Answer Sentence Ranking and Answer Extraction

Md Arafat Sultan, Vittorio Castelli, Radu Florian


Abstract
Answer sentence ranking and answer extraction are two key challenges in question answering that have traditionally been treated in isolation, i.e., as independent tasks. In this article, we (1) explain how both tasks are related at their core by a common quantity, and (2) propose a simple and intuitive joint probabilistic model that addresses both via joint computation but task-specific application of that quantity. In our experiments with two TREC datasets, our joint model substantially outperforms state-of-the-art systems in both tasks.
Anthology ID:
Q16-1009
Volume:
Transactions of the Association for Computational Linguistics, Volume 4
Month:
Year:
2016
Address:
Venue:
TACL
SIG:
Publisher:
Note:
Pages:
113–125
Language:
URL:
https://www.aclweb.org/anthology/Q16-1009
DOI:
10.1162/tacl_a_00087
Bib Export formats:
BibTeX MODS XML EndNote
PDF:
http://aclanthology.lst.uni-saarland.de/Q16-1009.pdf