Towards Higher Effective Rank in Parameter-efficient Fine-tuning using Khatri--Rao Product

• URL: http://arxiv.org/abs/2508.00230v1
• Date: Fri, 01 Aug 2025 00:29:13 GMT
• Title: Towards Higher Effective Rank in Parameter-efficient Fine-tuning using Khatri--Rao Product
• Authors: Paul Albert, Frederic Z. Zhang, Hemanth Saratchandran, Anton van den Hengel, Ehsan Abbasnejad,
• Abstract summary: We present a comparison amongst full-rank and low-rank PEFT methods.<n> KRAdapter is a novel PEFT algorithm that produces matrix product with a high effective rank.<n>We demonstrate performance gains with KRAdapter on vision-language models up to 1B parameters and on large language models up to 8B parameters.
• Score: 44.54075854327492
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Parameter-efficient fine-tuning (PEFT) has become a standard approach for adapting large pre-trained models. Amongst PEFT methods, low-rank adaptation (LoRA) has achieved notable success. However, recent studies have highlighted its limitations compared against full-rank alternatives, particularly when applied to multimodal and large language models. In this work, we present a quantitative comparison amongst full-rank and low-rank PEFT methods using a synthetic matrix approximation benchmark with controlled spectral properties. Our results confirm that LoRA struggles to approximate matrices with relatively flat spectrums or high frequency components -- signs of high effective ranks. To this end, we introduce KRAdapter, a novel PEFT algorithm that leverages the Khatri-Rao product to produce weight updates, which, by construction, tends to produce matrix product with a high effective rank. We demonstrate performance gains with KRAdapter on vision-language models up to 1B parameters and on large language models up to 8B parameters, particularly on unseen common-sense reasoning tasks. In addition, KRAdapter maintains the memory and compute efficiency of LoRA, making it a practical and robust alternative to fine-tune billion-scale parameter models.

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