The increasing size of neural networks has led to a growing demand for methods of efficient fine-tuning. Recently, an orthogonal fine-tuning paradigm was introduced that uses orthogonal matrices for adapting the weights of a pretrained model. In this paper, we introduce a new class of structured matrices, which unifies and generalizes structured classes from previous works. We examine properties of this class and build a structured orthogonal parametrization upon it. We then use this parametrization to modify the orthogonal fine-tuning framework, improving parameter and computational efficiency. We empirically validate our method on different domains, including adapting of text-to-image diffusion models and downstream task fine-tuning in language modeling. Additionally, we adapt our construction for orthogonal convolutions and conduct experiments with 1-Lipschitz neural networks.

在本研究中，我们引入了一类新的结构化矩阵，统一并推广了之前工作中的结构化类，以进一步改进参数和计算效率。我们还将这种参数化方法用于修改正交微调框架，在不同领域进行了实证验证，包括文本与图像扩散模型的自适应和语言建模中的下游任务微调。此外，我们还将我们的结构化构造用于正交卷积，并进行了1-Lipschitz神经网络的实验。

分组与混洗: 高效结构正交参数化