RoLoRA: Fine-tuning Rotated Outlier-free LLMs for Effective Weight-Activation Quantization

• URL: http://arxiv.org/abs/2407.08044v2
• Date: Thu, 26 Sep 2024 23:47:03 GMT
• Title: RoLoRA: Fine-tuning Rotated Outlier-free LLMs for Effective Weight-Activation Quantization
• Authors: Xijie Huang, Zechun Liu, Shih-Yang Liu, Kwang-Ting Cheng,
• Abstract summary: We propose RoLoRA, the first LoRA-based scheme for effective weight-activation quantization. We evaluate RoLoRA across LLaMA2-7B/13B, LLaMA3-8B models, achieving up to 29.5% absolute accuracy gain of 4-bit weight-activation quantized LLaMA2- 13B.
• Score: 38.23587031169402
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Low-Rank Adaptation (LoRA), as a representative Parameter-Efficient Fine-Tuning (PEFT)method, significantly enhances the training efficiency by updating only a small portion of the weights in Large Language Models (LLMs). Recently, weight-only quantization techniques have also been applied to LoRA methods to reduce the memory footprint of fine-tuning. However, applying weight-activation quantization to the LoRA pipeline is under-explored, and we observe substantial performance degradation primarily due to the presence of activation outliers. In this work, we propose RoLoRA, the first LoRA-based scheme for effective weight-activation quantization. RoLoRA utilizes rotation for outlier elimination and proposes rotation-aware fine-tuning to preserve the outlier-free characteristics in rotated LLMs. Experimental results show RoLoRA consistently improves low-bit LoRA convergence and post-training quantization robustness in weight-activation settings. We evaluate RoLoRA across LLaMA2-7B/13B, LLaMA3-8B models, achieving up to 29.5% absolute accuracy gain of 4-bit weight-activation quantized LLaMA2- 13B on commonsense reasoning tasks compared to LoRA baseline. We further demonstrate its effectiveness on Large Multimodal Models (LLaVA-1.5-7B). Codes are available at https://github.com/HuangOwen/RoLoRA

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