BANG: Bridging Autoregressive and Non-autoregressive Generation with Large Scale Pretraining
Abstract
In this paper, we propose BANG, a new pretraining model to Bridge the gap between Autoregressive (AR) and Non-autoregressive (NAR) Generation. AR and NAR generation can be uniformly regarded as to what extent previous tokens can be attended, and BANG bridges AR and NAR generation by designing a novel model structure for large-scale pretraining. The pretrained BANG model can simultaneously support AR, NAR and semi-NAR generation to meet different requirements. Experiments on question generation (SQuAD 1.1), summarization (XSum) and dialogue generation (PersonaChat) show that BANG improves NAR and semi-NAR performance significantly as well as attaining comparable performance with strong AR pretrained models. Compared with the semi-NAR strong baselines, BANG achieves absolute improvements of 14.01 and 5.24 in the overall scores of SQuAD 1.1 and XSum, respectively. In addition, BANG achieves absolute improvements of 10.73, 6.39 and 5.90 in the overall scores of SQuAD, XSUM and PersonaChat respectively compared with the strong NAR baselines.
Cite
@article{arxiv.2012.15525,
title = {BANG: Bridging Autoregressive and Non-autoregressive Generation with Large Scale Pretraining},
author = {Weizhen Qi and Yeyun Gong and Jian Jiao and Yu Yan and Weizhu Chen and Dayiheng Liu and Kewen Tang and Houqiang Li and Jiusheng Chen and Ruofei Zhang and Ming Zhou and Nan Duan},
journal= {arXiv preprint arXiv:2012.15525},
year = {2021}
}
Comments
Accepted by ICML 2021