NSNQuant applies a Normalize-Shift-Normalize transform plus a Hadamard rotation to make KV cache channels match a standard normal distribution, so one codebook trained on random noise can quantize them without calibration.
Quarot: Outlier-free 4-bit inference in rotated llms.Advances in Neural Information Processing Systems, 37:100213– 100240, 2025
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NSNQuant: A Double Normalization Approach for Calibration-Free Low-Bit Vector Quantization of KV Cache
NSNQuant applies a Normalize-Shift-Normalize transform plus a Hadamard rotation to make KV cache channels match a standard normal distribution, so one codebook trained on random noise can quantize them without calibration.