On Linearizing Structured Data in Encoder-Decoder Language Models: Insights from Text-to-SQL

• URL: http://arxiv.org/abs/2404.02389v1
• Date: Wed, 3 Apr 2024 01:16:20 GMT
• Title: On Linearizing Structured Data in Encoder-Decoder Language Models: Insights from Text-to-SQL
• Authors: Yutong Shao, Ndapa Nakashole,
• Abstract summary: This work investigates the linear handling of structured data in encoder-decoder language models, specifically T5. Our findings reveal the model's ability to mimic human-designed processes such as schema linking and syntax prediction. We also uncover insights into the model's internal mechanisms, including the ego-centric nature of structure node encodings.
• Score: 8.57550491437633
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Structured data, prevalent in tables, databases, and knowledge graphs, poses a significant challenge in its representation. With the advent of large language models (LLMs), there has been a shift towards linearization-based methods, which process structured data as sequential token streams, diverging from approaches that explicitly model structure, often as a graph. Crucially, there remains a gap in our understanding of how these linearization-based methods handle structured data, which is inherently non-linear. This work investigates the linear handling of structured data in encoder-decoder language models, specifically T5. Our findings reveal the model's ability to mimic human-designed processes such as schema linking and syntax prediction, indicating a deep, meaningful learning of structure beyond simple token sequencing. We also uncover insights into the model's internal mechanisms, including the ego-centric nature of structure node encodings and the potential for model compression due to modality fusion redundancy. Overall, this work sheds light on the inner workings of linearization-based methods and could potentially provide guidance for future research.

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