RaanA: A Fast, Flexible, and Data-Efficient Post-Training Quantization Algorithm

Yongyi Yang, Jianyang Gao, Wei Hu

Keywords: Post-Training Quantization, Mixed-Precision Quantization, Randomized Hadamard Transformation

TL;DR: We propose RaanA, a novel post training quantization algorithm that is extremely fast, flexible and require minimal calibration data.

Abstract: Post-training Quantization (PTQ) has become a widely used technique for improving inference efficiency of large language models (LLMs). However, existing PTQ methods generally suffer from crucial limitations such as heavy calibration data requirements and inflexible choice of target number of bits. In this paper, we propose RaanA, a unified PTQ framework that overcomes these challenges by introducing two novel components: 1) RaBitQ-H, a variant of a randomized vector quantization method RaBitQ, designed for fast, accurate, and highly efficient quantization; and 2) AllocateBits, an algorithm that optimally allocates bit-widths across layers based on their quantization sensitivity. RaanA achieves competitive performance with state-of-the-art quantization methods while being extremely fast, requiring minimal calibration data, and enabling flexible bit allocation. Extensive experiments demonstrate RaanA's efficacy in balancing efficiency and accuracy.

Submission Number: 41