Fast Abstractive Summarization with Reinforce-Selected Sentence Rewriting

Yen-Chun Chen, Mohit Bansal


Abstract
Inspired by how humans summarize long documents, we propose an accurate and fast summarization model that first selects salient sentences and then rewrites them abstractively (i.e., compresses and paraphrases) to generate a concise overall summary. We use a novel sentence-level policy gradient method to bridge the non-differentiable computation between these two neural networks in a hierarchical way, while maintaining language fluency. Empirically, we achieve the new state-of-the-art on all metrics (including human evaluation) on the CNN/Daily Mail dataset, as well as significantly higher abstractiveness scores. Moreover, by first operating at the sentence-level and then the word-level, we enable parallel decoding of our neural generative model that results in substantially faster (10-20x) inference speed as well as 4x faster training convergence than previous long-paragraph encoder-decoder models. We also demonstrate the generalization of our model on the test-only DUC-2002 dataset, where we achieve higher scores than a state-of-the-art model.
Anthology ID:
P18-1063
Volume:
Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)
Month:
July
Year:
2018
Address:
Melbourne, Australia
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
675–686
Language:
URL:
https://aclanthology.org/P18-1063
DOI:
10.18653/v1/P18-1063
Bibkey:
Cite (ACL):
Yen-Chun Chen and Mohit Bansal. 2018. Fast Abstractive Summarization with Reinforce-Selected Sentence Rewriting. In Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), pages 675–686, Melbourne, Australia. Association for Computational Linguistics.
Cite (Informal):
Fast Abstractive Summarization with Reinforce-Selected Sentence Rewriting (Chen & Bansal, ACL 2018)
Copy Citation:
PDF:
https://aclanthology.org/P18-1063.pdf
Note:
 P18-1063.Notes.pdf
Code
 ChenRocks/fast_abs_rl +  additional community code
Data
CNN/Daily Mail