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Procrustes Analysis for Improving Language Model Merging

The availability of many fine-tuned neural language models for different tasks naturally leads to the question of whether it is worthwhile to combine them, particularly through parameter merging, which is the least resource-intensive option. Among the many existing methods, some focus on parameter alignment before actual merging. In this article, we propose a new method within this research area, based on Procrustes analysis. We evaluate this method for merging fine-tuned models for the same task, derived from the same encoder-based model. Considering nine tasks from the GLUE benchmark, three Named Entity Recognition tasks, and six reference merging methods, we show that our proposal can improve upon existing merging methods in most tested configurations.