R<sup>3</sup>: Reinforced Ranker-Reader for Open-Domain Question Answering

Authors

  • Shuohang Wang Singapore Management University
  • Mo Yu IBM Research AI
  • Xiaoxiao Guo IBM Research AI
  • Zhiguo Wang IBM Research AI
  • Tim Klinger IBM Research AI
  • Wei Zhang IBM Research AI
  • Shiyu Chang IBM Research AI
  • Gerry Tesauro IBM Research AI
  • Bowen Zhou JD.COM
  • Jing Jiang Singapore Management University

Keywords:

Question Answering, Reinforcement learning, Deep Learning, QA, RL, DL

Abstract

In recent years researchers have achieved considerable success applying neural network methods to question answering (QA). These approaches have achieved state of the art results in simplified closed-domain settings such as the SQuAD (Rajpurkar et al. 2016) dataset, which provides a pre-selected passage, from which the answer to a given question may be extracted. More recently, researchers have begun to tackle open-domain QA, in which the model is given a question and access to a large corpus (e.g., wikipedia) instead of a pre-selected passage (Chen et al. 2017a). This setting is more complex as it requires large-scale search for relevant passages by an information retrieval component, combined with a reading comprehension model that “reads” the passages to generate an answer to the question. Performance in this setting lags well behind closed-domain performance. In this paper, we present a novel open-domain QA system called Reinforced Ranker-Reader (R3), based on two algorithmic innovations. First, we propose a new pipeline for open-domain QA with a Ranker component, which learns to rank retrieved passages in terms of likelihood of extracting the ground-truth answer to a given question. Second, we propose a novel method that jointly trains the Ranker along with an answer-extraction Reader model, based on reinforcement learning. We report extensive experimental results showing that our method significantly improves on the state of the art for multiple open-domain QA datasets.

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Published

2018-04-26

How to Cite

Wang, S., Yu, M., Guo, X., Wang, Z., Klinger, T., Zhang, W., Chang, S., Tesauro, G., Zhou, B., & Jiang, J. (2018). R<sup>3</sup>: Reinforced Ranker-Reader for Open-Domain Question Answering. Proceedings of the AAAI Conference on Artificial Intelligence, 32(1). Retrieved from https://ojs.aaai.org/index.php/AAAI/article/view/12053