2025 ACL Findings Leveraging Variation Theory in Counterfactual Data Augmentation for Optimized Active Learning Simret Araya Gebreegziabher, Kuangshi Ai, Zheng Zhang, Elena L. Glassman, and Toby Jia-Jun Li In Proceedings of the 63rd Annual Meeting of the Association for Computational Linguistics, 2025 arXiv Code