BOF4-S with outlier preservation computes Lloyd-optimal 4-bit block-wise codebooks and beats NF4 and AF4 on quantization error and perplexity.
NF4 Isn’t Information Theoretically Optimal (and That’s Good),
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Improving Block-Wise LLM Quantization by 4-bit Block-Wise Optimal Float (BOF4): Analysis and Variations
BOF4-S with outlier preservation computes Lloyd-optimal 4-bit block-wise codebooks and beats NF4 and AF4 on quantization error and perplexity.