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Qwen3-32B โ€” Cerebellum GGUF

Ablation-guided mixed-precision quantization of Qwen/Qwen3-32B. 32B parameters, dense architecture with GQA (64 heads, 8 KV heads), 64 layers.

What is Cerebellum?

Instead of uniform quantization, we measure which weight groups survive aggressive compression and which don't. Groups that tolerate Q2_K get demoted; groups that don't stay at Q3_K_M or higher. The result: smaller files with less quality loss than uniform quants of the same size.

Files

File Size Description
Qwen3-32B-Cerebellum-v2.gguf 15 GB Optimal mix โ€” 3 groups demoted (attn_k, attn_q, attn_output), 4 kept at Q3_K_M
Qwen3-32B-Cerebellum-v1.gguf 14 GB Aggressive โ€” 5 groups demoted (all attn + ffn_gate)

Benchmarks

Evaluated using our standardized benchmark suite with temperature=0, no thinking mode.

Cerebellum v2 (15 GB) โ€” Recommended

Benchmark Score Questions
ARC-Challenge 92.8% 1,172
HellaSwag 87.4% 10,042
MMLU 75.5% 11,643
HumanEval 45.1% 164

Note: HumanEval score reflects non-thinking mode. Qwen3 models perform significantly better on code with thinking enabled (/think or enable_thinking: true).

Size vs Quality

Model Size BPW PPL (wiki)
Q3_K_M (baseline) 16 GB 3.94 8.3288
Cerebellum v2 15 GB 3.67 8.3435
Cerebellum v1 14 GB 3.44 8.7273

v2 saves 1 GB (6%) over Q3_K_M with only +0.18% perplexity increase โ€” essentially lossless. The attn_k group actually improved perplexity when demoted.

Methodology

  1. Group ablation: Demote each of 7 weight groups to Q2_K individually. Measure PPL impact.
  2. Identify cheap groups: Three groups (attn_k, attn_q, attn_output) showed negligible or negative PPL impact when demoted.
  3. Build optimal mix: v2 demotes the 3 cheapest groups; v1 additionally demotes attn_v and ffn_gate.

Ablation Results

Group PPL when demoted Delta vs baseline
attn_k 8.3019 -0.0269 (improved!)
attn_q 8.3394 +0.0106
attn_output 8.3406 +0.0118
attn_v 8.3700 +0.0412
ffn_gate 8.6159 +0.2871
ffn_up 8.7267 +0.3979
ffn_down 8.8200 +0.4912

v2 Override Map

Demoted (Q2_K): attn_k, attn_q, attn_output (all 64 layers)
Sacred (kept at Q3_K_M): attn_v, ffn_gate, ffn_up, ffn_down

Usage

Works with any llama.cpp-compatible tool:

# llama.cpp
./llama-server --model Qwen3-32B-Cerebellum-v2.gguf -ngl 99 --ctx-size 4096

# Ollama (create Modelfile pointing to the GGUF)
# LM Studio (drag and drop)
# koboldcpp, text-generation-webui, etc.

Hardware Requirements

  • v2 (15 GB): Fits in 24 GB VRAM with generous context. RTX 3090, RTX 4090, etc.
  • v1 (14 GB): Fits in 16 GB VRAM with limited context. RTX 4060 Ti 16GB, etc.

Credits

Quantized with Cerebellum โ€” ablation-guided mixed-precision quantization by deucebucket.
Base model by Qwen.

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