Qwen3.5-2B-metro-v24

QLoRA fine-tune of Qwen3.5-2B for the MetroLLM-Bench transit-kiosk task. v24 is the leakage-free retraining used in the MetroLLM-Bench paper (teacher traces drawn only from the 717-case training partition; 238 cases held out). Supersedes continker/Qwen3.5-2B-metro-v23.

Held-out results (n=238, mean of 3 seeds)

Metric 2B base 2B + v24 Δ
Tier-1 74.17 81.20 +7.03
Composite 71.90 79.69 +7.79

The largest relative PEFT gain on the size curve. At 1.2 GB Q4_K_M it runs on a fanless laptop (~39 tok/s sustained on an M2 Air).

Contents

  • adapter/ — LoRA adapter (rank 16, α 32; QLoRA 4-bit NF4) + tokenizer + chat template
  • Qwen3.5-2B-metro-v24-Q4_K_M.gguf — merged GGUF (1.2 GB)
  • training_summary.json

GGUF: `llama-server --hf-repo continker/Qwen3.5-2B-metro-v24 --hf-file Qwen3.5-2B-metro-v24-Q4_K_M.gguf`. The LoRA adapter keys use the `.language_model.` prefix; strip it to load onto text-only Qwen3.5-2B. Apache 2.0.

Links

Citation

@techreport{hendriks2026metrollm,
  title       = {MetroLLM-Bench: Evaluating Language Models as Transit Kiosk Runtimes},
  author      = {Hendriks, Remco},
  institution = {Continker},
  type        = {Technical report},
  number      = {v1.2},
  year        = {2026},
  month       = {9},
  doi         = {10.5281/zenodo.21893944},
  eprint      = {2609.10016},
  archiveprefix = {arXiv},
  primaryclass = {cs.LG},
  url         = {https://arxiv.org/abs/2609.10016}
}
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