---
license: other
license_name: lfm1.0
license_link: https://huggingface.co/LiquidAI/LFM2.5-VL-450M/blob/main/LICENSE
base_model: LiquidAI/LFM2.5-VL-450M
library_name: transformers
pipeline_tag: image-text-to-text
tags:
  - vision-language
  - earth-observation
  - sentinel-2
  - galamsey
  - illegal-mining
  - lfm2-vl
  - lfm2.5-vl
  - object-detection
  - grounding
language:
  - en
datasets:
  - ellaampy/SmallMinesDS
---

# galamsey-v9-e3

Fine-tune of [LiquidAI/LFM2.5-VL-450M](https://huggingface.co/LiquidAI/LFM2.5-VL-450M) for detecting illegal small-scale gold mining ("**galamsey**") in Sentinel-2 satellite imagery over Ghana. Used as the perception layer of [**GalamseyWatch**](https://github.com/samadon1/GalamseyWatch) — a two-layer agentic Earth-observation system (perception VLM + LFM2 tool-calling policy) submitted to the Liquid AI × DPhi Space "AI in Space" hackathon.

The browser/WebGPU sibling of this checkpoint is [`samwell/galamsey-v9-e3-onnx`](https://huggingface.co/samwell/galamsey-v9-e3-onnx).

## Live demo

A click-to-detect dashboard running this model fully in-browser via WebGPU: [galamseywatch.vercel.app](https://galamseywatch.vercel.app). Click anywhere over Ghana, the page pulls a Sentinel-2 tile, runs the model on-device, and renders bounding boxes + a description. ~1 GB one-time download, then cached. Nothing leaves the device.

## What it does

Given paired **RGB** and **SWIR false-color** composites of a 1.28 km Sentinel-2 tile (10 m/px), the model returns:

- A **JSON list of bounding boxes** for every visible mining pit, normalized to `[0, 1]`.
- A **natural-language description** of the scene (e.g. *"Multiple active excavation pits with sediment plumes and exposed lateritic soil"*).

Both outputs come from the same fine-tune, with two prompts. The grounding prompt emits boxes; the description prompt emits prose. See the [GalamseyWatch repo](https://github.com/samadon1/GalamseyWatch) for the exact prompts and the post-processing (NMS, min-area filter).

## Performance vs. base model

Evaluated on the SmallMinesDS test split, full pixel-IoU pipeline (bbox-to-mask scoring), same RGB + SWIR two-image prompt for both runs:

| Metric | Base LFM2.5-VL-450M | galamsey-v9-e3 | Δ |
|---|---:|---:|---:|
| Pixel IoU | 0.069 | **0.332** | **+0.263** |
| Pixel recall | — | **0.592** | — |
| Pixel SDC F1 | — | **0.499** | — |
| Patch accuracy | — | **0.795** | — |

That's a **~4.8× lift in pixel IoU** over the base model on the same evaluation. Recall, F1, and patch accuracy were not separately recorded for the base run; the focus was the headline IoU lift.

### Honest ceiling

Galamsey pits are irregular polygons, but this model emits **axis-aligned bounding boxes**. Even with *perfect* bbox predictions — every box exactly circumscribing its ground-truth mask — the maximum achievable pixel IoU against the SmallMinesDS pixel-level masks is **0.4692** (computed directly by converting every GT mask to its tightest bbox and scoring that against the mask).

So **0.332 = 71% of the achievable ceiling for any bbox-emitting method on this benchmark.** A pixel-mask architecture (e.g. a U-Net) operates in a different regime and is not directly comparable.

## Training

| | |
|---|---|
| **Base model** | LiquidAI/LFM2.5-VL-450M |
| **Dataset** | [SmallMinesDS](https://huggingface.co/datasets/ellaampy/SmallMinesDS) (Ofori-Ampofo et al., 2025) — 4,270 labeled Ghana patches, CC-BY-SA-4.0 |
| **Inputs** | Paired RGB and SWIR false-color composites (two-image prompt) |
| **Augmentation** | 8× D4 dihedral group (flips + rotations) |
| **Method** | Full fine-tuning (no LoRA) |
| **Epochs** | 3 (17,719 steps) |
| **Batch size** | 4 |
| **Learning rate** | 2e-5, with separate rates for LM / projector / vision tower |
| **Hardware** | 1× NVIDIA H100 via [Modal](https://modal.com) |
| **Final training loss** | 0.175 (from 2.10 at step 1) |

## Intended use

- **Detection** of illegal gold-mining pits in 10 m/px Sentinel-2 imagery over **Ghana**.
- **Grounded inspection** workflows where a human reviewer wants both bounding boxes and a natural-language second opinion.
- **Edge / on-orbit deployment**: the 450M parameter count and ONNX export make this practical for satellite-class compute.

It is **not** a general-purpose mining detector. Performance outside Ghana, outside Sentinel-2, or outside the visible/SWIR composites it was trained on is not guaranteed.

## Known failure modes

Surfaced honestly so downstream users can plan around them:

- **Cloud-occluded tiles**: Sentinel-2 is optical, not SAR — the model can't see through cloud and may hallucinate mining where it sees only whiteness. Pre-filter on `cloud_cover` if possible.
- **Legal quarries**: there is no visual signal in a single patch that distinguishes licensed quarrying from galamsey; cross-reference with concession polygons at the post-inference layer.
- **Freshly-cleared farmland**: similar SWIR signature to exposed soil. The geometric shape (rectilinear vs. amorphous) is the disambiguating cue, not the spectrum.
- **Tiny pits** (2–3 pixels): bbox effectively a point; pixel IoU is noisy at this regime.
- **Out-of-distribution geology**: Eastern / Volta regions outside the SmallMinesDS training geography.

## Inference

```python
from transformers import AutoProcessor, AutoModelForImageTextToText
from PIL import Image

model = AutoModelForImageTextToText.from_pretrained(
    "samwell/galamsey-v9-e3", device_map="auto", dtype="bfloat16"
)
processor = AutoProcessor.from_pretrained("samwell/galamsey-v9-e3")

rgb = Image.open("tile_rgb.png")     # B4+B3+B2 composite
swir = Image.open("tile_swir.png")   # B12+B11+B8 false-color composite

GROUNDING_PROMPT = (
    "You are viewing two images of the same Sentinel-2 patch: a natural-color RGB "
    "composite and a SWIR false-color composite. Using both views, detect any "
    "illegal small-scale gold mining pits. "
    'Provide result as a valid JSON: [{"label": str, "bbox": [x1,y1,x2,y2]}, ...]. '
    "Coordinates must be normalized to 0-1. If no pits are visible, return []."
)

conversation = [{
    "role": "user",
    "content": [
        {"type": "image", "image": rgb},
        {"type": "image", "image": swir},
        {"type": "text", "text": GROUNDING_PROMPT},
    ],
}]

inputs = processor.apply_chat_template(
    conversation, add_generation_prompt=True, return_tensors="pt",
    return_dict=True, tokenize=True,
).to(model.device)

outputs = model.generate(**inputs, max_new_tokens=256)
print(processor.batch_decode(outputs, skip_special_tokens=True)[0])
```

For the description prompt and the full inference pipeline (NMS, min-bbox-area filter, area estimation), see [`app/src/lib/inference.ts`](https://github.com/samadon1/GalamseyWatch/blob/main/app/src/lib/inference.ts) (browser path) and [`orchestrator/agentic_eo/models/vlm.py`](https://github.com/samadon1/GalamseyWatch/blob/main/orchestrator/agentic_eo/models/vlm.py) (Python path).

## Citation

If you use this model, please cite:

- The base model — Liquid AI's [LFM2 Technical Report](https://arxiv.org/abs/2511.23404) (arXiv:2511.23404).
- The dataset — Ofori-Ampofo et al., 2025, [*SmallMinesDS*](https://doi.org/10.1109/LGRS.2025.3566356), IEEE GRSL.
- This fine-tune — `samwell/galamsey-v9-e3` and the [GalamseyWatch repo](https://github.com/samadon1/GalamseyWatch).

## License

[LFM Open License v1.0](https://huggingface.co/LiquidAI/LFM2.5-VL-450M/blob/main/LICENSE), inherited from the base model.