---
title: CapRL-Qwen3VL-4B for Image Captioning
emoji: 🎨
colorFrom: blue
colorTo: purple
sdk: gradio
sdk_version: 5.49.1
app_file: app.py
pinned: false
license: apache-2.0
short_description: Generate captions for images with CapRL-Qwen3VL-4B
---

# CapRL-Qwen3VL-4B Image Captioning

This Space demonstrates **CapRL-Qwen3VL-4B**, a 4B parameter multimodal vision-language model fine-tuned using reinforcement learning for dense image captioning.

## Model

- **Model**: [internlm/CapRL-Qwen3VL-4B](https://huggingface.co/internlm/CapRL-Qwen3VL-4B)
- **Architecture**: Based on Qwen3-VL
- **Task**: Dense Image Captioning

## Usage

Upload an image or select from the examples to generate a detailed caption.

## Links

- [Paper](https://arxiv.org/abs/2509.22647)
- [GitHub](https://github.com/InternLM/CapRL)
- [CapRL-3B Model](https://huggingface.co/internlm/CapRL-3B)
- [CapRL-2M Dataset](https://huggingface.co/datasets/internlm/CapRL-2M)
- [CapRL Collection](https://huggingface.co/collections/long-xing1/caprl-68d64ac32ded31596c36e189)

## Citation

```bibtex
@article{xing2025caprl,
  title={{CapRL}: Stimulating Dense Image Caption Capabilities via Reinforcement Learning},
  author={Xing, Long and Dong, Xiaoyi and Zang, Yuhang and Cao, Yuhang and Liang, Jianze and Huang, Qidong and Wang, Jiaqi and Wu, Feng and Lin, Dahua},
  journal={arXiv preprint arXiv:2509.22647},
  year={2025}
}
```

Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference