RASAT: Integrating Relational Structures into Pretrained Seq2Seq Model for Text-to-SQL
Jiexing Qi | Jingyao Tang | Ziwei He | Xiangpeng Wan | Yu Cheng | Chenghu Zhou | Xinbing Wang | Quanshi Zhang | Zhouhan Lin
Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing
Relational structures such as schema linking and schema encoding have been validated as a key component to qualitatively translating natural language into SQL queries. However, introducing these structural relations comes with prices: they often result in a specialized model structure, which largely prohibits using large pretrained models in text-to-SQL. To address this problem, we propose RASAT: a Transformer seq2seq architecture augmented with relation-aware self-attention that could leverage a variety of relational structures while inheriting the pretrained parameters from the T5 model effectively. Our model can incorporate almost all types of existing relations in the literature, and in addition, we propose introducing co-reference relations for the multi-turn scenario. Experimental results on three widely used text-to-SQL datasets, covering both single-turn and multi-turn scenarios, have shown that RASAT could achieve competitive results in all three benchmarks, achieving state-of-the-art execution accuracy (75.5% EX on Spider, 52.6% IEX on SParC, and 37.4% IEX on CoSQL).
- Jiexing Qi 1
- Jingyao Tang (唐靖尧) 1
- Ziwei He 1
- Xiangpeng Wan 1
- Yu Cheng 1
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