---
title: GPD Spatial Reasoning
emoji: 🧭
colorFrom: pink
colorTo: indigo
sdk: gradio
sdk_version: 6.30.0
app_file: app.py
short_description: Spatial-reasoning VLM distilled with routed 3D privilege
python_version: "3.12"
---

# 🧭 GPD · Distilling Routed 3D Privilege for Spatial Reasoning

This Space runs **GPD-4B**, an RGB-only vision-language model fine-tuned from
[Qwen3-VL-4B-Instruct](https://huggingface.co/Qwen/Qwen3-VL-4B-Instruct) with
**GPD** (*Geometry-Privileged Distillation*): on-policy self-distillation in which a
teacher version of the model sees question-routed textual 3D cues (depth / semantic /
bird's-eye-view) plus the reference answer, while the deployed student stays **RGB-only**.
The privileged KL on incorrect trajectories augments GRPO.

Upload a single image, ask a 3D spatial-reasoning question — observer-shift spatial
imagination, directional relations between objects, depth / distance estimation in meters —
and the model thinks step by step, then wraps its final answer in `<answer>` tags.

## Model

- **Checkpoint:** [xinyili0624/GPD-4B](https://huggingface.co/xinyili0624/GPD-4B) (Apache-2.0)
- **2B variant:** [xinyili0624/GPD-2B](https://huggingface.co/xinyili0624/GPD-2B)
- **Paper:** [Distilling Routed 3D Privilege for Spatial Reasoning in Vision-Language Models](https://huggingface.co/papers/2610.12355)
- **Code:** [github.com/ZJU-REAL/GPD](https://github.com/ZJU-REAL/GPD)
- **Training data:** [xinyili0624/GPD-15k](https://huggingface.co/datasets/xinyili0624/GPD-15k) (VSI 10k + SPAR 4k + MindCube 1k)

On Qwen3-VL-4B, GPD reaches **57.1** on VSI-Bench and **37.6** average across
MindCube, SPAR-Bench, MMSI-Bench, and ViewSpatial.

## Examples

The bundled example images and questions are taken from the authors'
[GPD-15k](https://huggingface.co/datasets/xinyili0624/GPD-15k) dataset
(Apache-2.0), specifically its SPAR single-image scenes, which are rendered with
bounding-box / point annotations marking the objects the question refers to.

## Citation

```bibtex
@article{li2026gpd,
  title={Distilling Routed 3D Privilege for Spatial Reasoning in Vision-Language Models},
  author={Li, Hongxing and Li, Yixin and Li, Dingming and Wang, Zixuan and Yan, Yuchen and Zhang, Wenqi and Lu, Weiming and Shen, Yongliang},
  journal={arXiv preprint arXiv:2610.12355},
  year={2026}
}
```