optim — Qwen3.8-27B DevSecOps QLoRA (GGUF)

A QLoRA fine-tune of Qwen/Qwen3.8-27B (Apache-2.0, Qwen3.5 MoE, qwen35 arch in llama.cpp) on a devops / coding / security corpus, quantized to GGUF. One variant additionally has refusal directions ablated ("abliterated").

Files

File Quant Size Lineage
Qwen3.8-27B-DevSecOps-QLoRA-Q4_K_M.gguf Q4_K_M 16 GB merged fine-tune, no ablation
Qwen3.8-27B-DevSecOps-QLoRA-abliterated-Q4_K_M.gguf Q4_K_M 16 GB merged fine-tune, refusal-ablated
optim-Q3_K_M.gguf Q3_K_M 13 GB refusal-ablated (the daily-driver quant)
optim-Q2_K.gguf Q2_K 10 GB refusal-ablated, smallest
Qwen3.8-27B-DevSecOps-QLoRA-mmproj-F16.gguf F16 885 MB CLIP vision projector for the multimodal tower

All quants carry the embedded Qwen chat template; llama-server --jinja works out of the box.

Quick start

# 3-bit, refusal-ablated (the config this was served with)
llama-server -hf outbackdingo/Qwen3.8-27B-DevSecOps-QLoRA:optim-Q3_K_M.gguf \
  --host 0.0.0.0 --port 8000 -ngl 99 -c 128000 --jinja -fa on

# with vision
llama-server -hf outbackdingo/Qwen3.8-27B-DevSecOps-QLoRA:Qwen3.8-27B-DevSecOps-QLoRA-abliterated-Q4_K_M.gguf \
  --mmproj outbackdingo/Qwen3.8-27B-DevSecOps-QLoRA:Qwen3.8-27B-DevSecOps-QLoRA-mmproj-F16.gguf -ngl 99 -c 32768 --jinja

Training

  • 4-bit NF4 QLoRA, LoRA r=16 / alpha=16 / dropout 0, targets q,k,v,o,gate,up,down on the text stack
  • 53,536 training rows (devops, coding, security/LLM-security), 3 epochs ≈ 20k steps
  • max_seq_len 2048, effective batch 8 (1 × grad-accum 8), lr 2e-5 cosine, warmup 3%, seed 3407
  • ~7.5 s/sample on a single 24 GB card; checkpoint used here is step 18,500
  • merged to bf16 → convert_hf_to_gguf → llama-quantize

Eval — 60 held-out cybersecurity prompts, identical decode settings

Metric base Qwen3.8-27B this fine-tune
Refusal rate 31.7% 15.0%
Mean token F1 vs reference 0.2200 0.2185
ROUGE-L 0.1216 0.1187
Mean answer length 306 words 354 words
F1 higher than base — 30 / 60 prompts

Honest read: the fine-tune roughly halves refusals and answers longer, but n-gram overlap with the reference answers is flat (differences are within noise at n=60). It is not measurably "smarter" by these metrics — it is more permissive and more verbose in the security domain. No MMLU/GSM8K-style benchmarks were run.

Caveats

  • The abliterated variants have refusal behaviour removed. Output can be offensive, unsafe, or wrong, including on security topics. Do not use for safety-critical, medical, legal, or customer-facing deployment.
  • Training data provenance was not audited line by line; licensing of individual corpus sources is the user's responsibility before commercial use.
  • Q2_K degrades noticeably on reasoning and long-context tasks; Q3_K_M is the intended trade-off point.
  • Evaluated only on English cybersecurity prompts.

License

Apache-2.0, inherited from the base model. Base weights: Qwen/Qwen3.8-27B.

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