Author

Yi-Ning Chen

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Preprint Sep 2026

PrismQuant: Optimal Null-Space Rotations for Grouped Quantizers

Smaller activation outliers do not necessarily imply better low-bit quantization: their alignment with the quantizer matters. We introduce PrismQuant, a quantizer-aware rotation framework that aligns the leading activation eigenspace with the constant group subspace of asymmetric grouped INT4. The affine offsets repres...

Yan-Long Chen, Yi-Ning Chen, Song Zhang et al. · 0 citations

#artificial intelligence Preprint Sep 2026

PrismQuant: Optimal Null-Space Rotations for Grouped Quantizers

This work introduces PrismQuant, a quantizer-aware rotation framework that aligns the leading activation eigenspace with the constant group subspace of asymmetric grouped INT4, and formulate rotation design as a Ky Fan trace maximization and derive a closed-form solution that is provably optimal for this alignment obje...

Yan-Long Chen, Yi-Ning Chen, Song Zhang et al. · 0 citations