A Gemma 4 E4B-IT fine-tune that estimates the anterior-posterior (AP) coordinate of a histological brain section in the matching mouse coronal atlas. Trained on adult (Allen mouse 25 µm) and developmental (DeMBA P9–P35, ADMBA P4–P56) coronal sections.

Model	Mean abs. error (mm)	Mean error (% of 13.2 mm AP axis)
Base unsloth/gemma-4-E4B-it	2.375	18.02 %
LangSlice-Gemma-4-E4B v1.0	1.228	9.32 %
Gemini 3 Flash Preview	0.429	3.25 %

SliceBench small coronal, mouse subset (n = 112).

Serve via vLLM

bash

vllm serve greenpolo/langslice-gemma-4-E4B \
  --max-model-len 16384 \
  --enable-auto-tool-choice \
  --tool-call-parser gemma4 \
  --reasoning-parser gemma4

GGUF (Q4_K_M, Q8_0, BF16) under gguf/ for use with llama.cpp llama-mtmd-cli (pair with the bundled mmproj-BF16.gguf for image input).

The model is intentionally scoped to single-slice mouse coronal AP estimation. Sagittal, horizontal, and rat performance are much weaker. Inference must use the bundled chat template.

Full agent loop, multi-slice estimation, and end-to-end registration: LangSlice harness.

License

Gemma 4 Terms of Use governs the weights.

Citation

A Zenodo DOI is forthcoming. Until it's minted, please cite this Hugging Face repository directly:

Baughman, N. and Walsh Lab. LangSlice-Gemma-4-E4B v1.0. Hugging Face, 2026. https://huggingface.co/greenpolo/langslice-gemma-4-E4B