Supervised fine-tuning (SFT) is crucial for adapting Large Language Models (LLMs) to specific tasks. In this work, we demonstrate that the order of training data can lead to significant training imbalances, potentially resulting in performance degradation. Consequently, we propose to mitigate this imbalance by merging SFT models fine-tuned with different data orders, thereby enhancing the overall effectiveness of SFT. Additionally, we introduce a novel technique, "parameter-selection merging," which outperforms traditional weighted-average methods on five datasets. Further, through analysis and ablation studies, we validate the effectiveness of our method and identify the sources of performance improvements.
@article{arxiv.2410.03743,
title = {Mitigating Training Imbalance in LLM Fine-Tuning via Selective Parameter Merging},
author = {Yiming Ju and Ziyi Ni and Xingrun Xing and Zhixiong Zeng and hanyu Zhao and Siqi Fan and Zheng Zhang},
journal= {arXiv preprint arXiv:2410.03743},
year = {2024}
}