AI BriefingMLX Q vs oQ Comparison
·2026.04.25 03:24
Key point
The quantization levels of MLX Q and oQ were compared using KL divergence and RAM usage.
Details
MLX Q and oQ quantization were compared based on KL divergence (KLD) and RAM usage.
- oQ showed lower KLD compared to Q in the low-bit range.
- For example, oQ4 had KLD 0.116943, RAM 22.70GiB, while Q4 had KLD 0.211914, RAM 21.96GiB.
- Q2 had KLD 4.687500, RAM 13.89GiB, showing stronger compression but greater distribution loss.
- In the high-bit range, the difference between the two methods narrowed, and Q8 (0.011803, 38.09GiB) and oQ8 (0.009682, 38.08GiB) were nearly identical.
The reproduction scripts and charts are published in the mlx-kld repository.
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