In this paper, we move towards combining large parametric models with
non-parametric prototypical networks. We propose prototypical fine-tuning, a
novel prototypical framework for fine-tuning pretrained language models (LM),
which automatically learns a bias to improve predictive performance for varying
data sizes, especially low-resource settings. Our prototypical fine-tuning
approach can automatically adjust the model capacity according to the number of
data points and the model's inherent attributes. Moreover, we propose four
principles for effective prototype fine-tuning towards the optimal solution.
Experimental results across various datasets show that our work achieves
significant performance improvements under various low-resource settings, as
well as comparable and usually better performances in high-resource scenarios.

本文提出了原型微调框架，结合大的参数模型和非参数模型，通过对预训练语言模型进行微调，自动学习偏差，提高预测性能，并提出了四个原则，以向最优解效果调整原型。实验结果表明，在各种低资源情况下，我们的方法在不降低性能的情况下取得了显着的性能提升。