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loop-qwen-v8 — on-device insulin-dosing controller (Qwen3-4B)

A Qwen3-4B policy distilled from a Gemini-3-flash-preview insulin-control teacher, for closed-loop Type-1-diabetes insulin dosing. It runs on-device (2.5 GB Q4 GGUF via Ollama/llama.cpp; one decision per 5-min loop) and reaches teacher parity in the simglucose closed-loop simulator.

Results (held-out 9 patients, 48 h, seed 42)

TIR (70–180) Survival TBR (<70)
Gemini teacher 73.5% 8/9 7.0%
loop-qwen-v8 (this model) 72.4% 9/9 9.5%

Confirmed on a novel meal scenario (seed 99): 73.0% TIR, 9/9 survival. All-30 patients: v8 75.8% TIR / 28-30 survival vs Gemini 76.6% / 29-30.

Files

  • model.safetensors + config/tokenizer — merged fp16 (for transformers / re-quantizing)
  • loop-qwen-v8-Q4_K_M.gguf — deployable 4-bit (Ollama / llama.cpp)

Usage (Ollama)

ollama create loop-qwen-v8 --quantize q4_K_M -f Modelfile   # or import the gguf
# prompt = patient metadata + 6h CGM/insulin/carb history (JSON)
# output = {"reasoning": "...", "basal_chunk":[5], "bolus_chunk":[5]}

Deployment applies safety clamps: basal ∈ [0,5] U/hr, bolus ∈ [0,20] U.

Recipe

Qwen3-4B + LoRA (r=32) SFT on Gemini Chain-of-Draft demonstrations, +DAgger (relabel student-visited states), + multi-seed meal diversity (the key to matching the teacher without dosing oscillation). Full log: docs/distill_experiment_log.md in the loop-gpt repo.

⚠️ Not a medical device

Research artifact evaluated only in simulation. Residual hypoglycemia (TBR ~10% vs teacher 7%) remains; a low-glucose-suspend safety rail is recommended before any real use. Do not use for actual insulin dosing.

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