Few-Shot Self-Rationalization with Natural Language Prompts

Ana Marasovic, Iz Beltagy, Doug Downey, Matthew Peters


Abstract
Self-rationalization models that predict task labels and generate free-text elaborations for their predictions could enable more intuitive interaction with NLP systems. These models are, however, currently trained with a large amount of human-written free-text explanations for each task which hinders their broader usage. We propose to study a more realistic setting of self-rationalization using few training examples. We present FEB—a standardized collection of four existing English-language datasets and associated metrics. We identify the right prompting approach by extensively exploring natural language prompts on FEB. Then, by using this prompt and scaling the model size, we demonstrate that making progress on few-shot self-rationalization is possible. We show there is still ample room for improvement in this task: the average plausibility of generated explanations assessed by human annotators is at most 51% (with GPT-3), while plausibility of human explanations is 76%. We hope that FEB and our proposed approach will spur the community to take on the few-shot self-rationalization challenge.
Anthology ID:
2022.findings-naacl.31
Volume:
Findings of the Association for Computational Linguistics: NAACL 2022
Month:
July
Year:
2022
Address:
Seattle, United States
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
410–424
Language:
URL:
https://aclanthology.org/2022.findings-naacl.31
DOI:
10.18653/v1/2022.findings-naacl.31
Bibkey:
Cite (ACL):
Ana Marasovic, Iz Beltagy, Doug Downey, and Matthew Peters. 2022. Few-Shot Self-Rationalization with Natural Language Prompts. In Findings of the Association for Computational Linguistics: NAACL 2022, pages 410–424, Seattle, United States. Association for Computational Linguistics.
Cite (Informal):
Few-Shot Self-Rationalization with Natural Language Prompts (Marasovic et al., Findings 2022)
Copy Citation:
PDF:
https://aclanthology.org/2022.findings-naacl.31.pdf
Video:
 https://aclanthology.org/2022.findings-naacl.31.mp4
Code
 allenai/feb
Data
ECQASBIC