CATfOOD: Counterfactual Augmented Training for Improving Out-of-Domain Performance and Calibration

• URL: http://arxiv.org/abs/2309.07822v3
• Date: Tue, 13 Feb 2024 10:52:52 GMT
• Title: CATfOOD: Counterfactual Augmented Training for Improving Out-of-Domain Performance and Calibration
• Authors: Rachneet Sachdeva, Martin Tutek, Iryna Gurevych
• Abstract summary: We show that data augmentation consistently enhances OOD performance. We also show that CF augmented models which are easier to calibrate also exhibit much lower entropy when assigning importance.
• Score: 59.48235003469116
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: In recent years, large language models (LLMs) have shown remarkable capabilities at scale, particularly at generating text conditioned on a prompt. In our work, we investigate the use of LLMs to augment training data of small language models~(SLMs) with automatically generated counterfactual~(CF) instances -- i.e. minimally altered inputs -- in order to improve out-of-domain~(OOD) performance of SLMs in the extractive question answering~(QA) setup. We show that, across various LLM generators, such data augmentation consistently enhances OOD performance and improves model calibration for both confidence-based and rationale-augmented calibrator models. Furthermore, these performance improvements correlate with higher diversity of CF instances in terms of their surface form and semantic content. Finally, we show that CF augmented models which are easier to calibrate also exhibit much lower entropy when assigning importance, indicating that rationale-augmented calibrators prefer concise explanations.

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