Update model card for Pref-GRPO: add pipeline tag, library, and correct paper/project/code links

This PR improves the model card for `UnifiedReward-qwen-7b`, clarifying its role as a reward model in the context of the **Pref-GRPO: Pairwise Preference Reward-based GRPO for Stable Text-to-Image Reinforcement Learning** paper.

Specifically, it addresses the following points:
- **Corrected Paper Link:** Updated the paper link in the content to [https://huggingface.co/papers/2508.20751](https://huggingface.co/papers/2508.20751) as per the prompt's instruction, which describes the Pref-GRPO framework in which this reward model is used.
- **Updated Project Page Link:** Pointed the project page to the more specific [https://codegoat24.github.io/UnifiedReward/Pref-GRPO](https://codegoat24.github.io/UnifiedReward/Pref-GRPO).
- **Added GitHub Link:** Included a direct link to the Pref-GRPO code at [https://github.com/CodeGoat24/Pref-GRPO](https://github.com/CodeGoat24/Pref-GRPO).
- **Added Pipeline Tag:** Set `pipeline_tag: image-text-to-text` to accurately reflect the model's input (image, text) and output (text evaluation). This helps users discover the model more easily.
- **Added Library Name:** Specified `library_name: transformers` as the model uses the Hugging Face Transformers library for inference, enabling the "Use in Transformers" widget.
- **Made Sample Usage Runnable:** Added `import requests` to the Python snippet to ensure the example code is runnable out-of-the-box.
- **Updated Citation:** Replaced the outdated BibTeX entry with the correct one for the Pref-GRPO paper.
- **Updated Quick Start GitHub Link:** Corrected the GitHub link in the Quick Start section to point to the Pref-GRPO repository.

These changes enhance the discoverability, clarity, and completeness of the model card.

README.md

@@ -1,29 +1,33 @@
 ---
-license: mit
+base_model:
+- Qwen/Qwen2.5-VL-7B-Instruct
 datasets:
 - CodeGoat24/HPD
 - CodeGoat24/LiFT-HRA
 - CodeGoat24/OIP
 - CodeGoat24/EvalMuse
 - CodeGoat24/ShareGPTVideo-DPO
-- CodeGoat24/VideoFeedback
 - CodeGoat24/LLaVA-Critic-113k
 - CodeGoat24/VideoDPO
-base_model:
-- Qwen/Qwen2.5-VL-7B-Instruct
+license: mit
+pipeline_tag: image-text-to-text
+library_name: transformers
 ---
 
+# UnifiedReward-qwen-7B: A Reward Model for Pref-GRPO
 
-# UnifiedReward-qwen-7B
 We are actively gathering feedback from the community to improve our models. **We welcome your input and encourage you to stay updated through our repository**!!
 
 ## Model Summary
 
-`UnifiedReward-qwen-7b` is the first unified reward model based on [Qwen/Qwen2.5-VL-7B-Instruct](https://huggingface.co/Qwen/Qwen2.5-VL-7B-Instruct) for multimodal understanding and generation assessment, enabling both pairwise ranking and pointwise scoring, which can be employed for vision model preference alignment.
+`UnifiedReward-qwen-7b` is the first unified reward model based on [Qwen/Qwen2.5-VL-7B-Instruct](https://huggingface.co/Qwen/Qwen2.5-VL-7B-Instruct) for multimodal understanding and generation assessment. It enables both pairwise ranking and pointwise scoring, and is notably employed for vision model preference alignment within the **Pref-GRPO** framework.
+
+This model is a key component of the research presented in the paper [**Pref-GRPO: Pairwise Preference Reward-based GRPO for Stable Text-to-Image Reinforcement Learning**](https://huggingface.co/papers/2508.20751).
 
 For further details, please refer to the following resources:
-- 📰 Paper: https://arxiv.org/pdf/2503.05236
-- 🪐 Project Page: https://codegoat24.github.io/UnifiedReward/
+- 📰 Paper: [Pref-GRPO: Pairwise Preference Reward-based GRPO for Stable Text-to-Image Reinforcement Learning](https://huggingface.co/papers/2508.20751)
+- 🪐 Project Page: https://codegoat24.github.io/UnifiedReward/Pref-GRPO
+- 💻 Code: https://github.com/CodeGoat24/Pref-GRPO
 - 🤗 Model Collections: https://huggingface.co/collections/CodeGoat24/unifiedreward-models-67c3008148c3a380d15ac63a
 - 🤗 Dataset Collections: https://huggingface.co/collections/CodeGoat24/unifiedreward-training-data-67c300d4fd5eff00fa7f1ede
 - 👋 Point of Contact: [Yibin Wang](https://codegoat24.github.io)
@@ -31,22 +35,22 @@ For further details, please refer to the following resources:
 
 ## 🏁 Compared with Current Reward Models
 
-|  Reward Model | Method| Image Generation | Image Understanding | Video Generation | Video Understanding
+| Reward Model | Method| Image Generation | Image Understanding | Video Generation | Video Understanding
 | :-----: | :-----: |:-----: |:-----: | :-----: | :-----: |
-|  [PickScore](https://github.com/yuvalkirstain/PickScore) |Point | √ |  | ||
-|  [HPS](https://github.com/tgxs002/HPSv2) | Point | √ |  |||
-|  [ImageReward](https://github.com/THUDM/ImageReward) |  Point| √|  |||
-|  [LLaVA-Critic](https://huggingface.co/lmms-lab/llava-critic-7b) | Pair/Point | | √  |||
-|  [IXC-2.5-Reward](https://github.com/InternLM/InternLM-XComposer) | Pair/Point | | √  ||√|
-|  [VideoScore](https://github.com/TIGER-AI-Lab/VideoScore) | Point |  |  |√ ||
-|  [LiFT](https://github.com/CodeGoat24/LiFT) | Point |  |  |√| |
-|  [VisionReward](https://github.com/THUDM/VisionReward) | Point |√  | |√||
-|  [VideoReward](https://github.com/KwaiVGI/VideoAlign) | Point |  |  |√ ||
-|  UnifiedReward (Ours) | Pair/Point | √ | √ |√|√|
+| [PickScore](https://github.com/yuvalkirstain/PickScore) |Point | √ | | ||
+| [HPS](https://github.com/tgxs002/HPSv2) | Point | √ | |||
+| [ImageReward](https://github.com/THUDM/ImageReward) | Point| √| |||
+| [LLaVA-Critic](https://huggingface.co/lmms-lab/llava-critic-7b) | Pair/Point | | √ |||
+| [IXC-2.5-Reward](https://github.com/InternLM/InternLM-XComposer) | Pair/Point | | √ ||√|
+| [VideoScore](https://github.com/TIGER-AI-Lab/VideoScore) | Point | | |\u221a ||
+| [LiFT](https://github.com/CodeGoat24/LiFT) | Point | | |\u221a| |
+| [VisionReward](https://github.com/THUDM/VisionReward) | Point |√ | |\u221a||
+| [VideoReward](https://github.com/KwaiVGI/VideoAlign) | Point | | |\u221a ||
+| UnifiedReward (Ours) | Pair/Point | √ | √ |\u221a|\u221a|
 
 
 ### Quick Start
-All pair rank and point score inference codes are provided in our [github](https://github.com/CodeGoat24/UnifiedReward).
+All pair rank and point score inference codes are provided in our [GitHub repository](https://github.com/CodeGoat24/Pref-GRPO).
 
 We take image understanding assessment as example here:
 ~~~python
@@ -57,6 +61,7 @@ import tqdm
 from PIL import Image
 import warnings
 import os
+import requests # Added for image download in example
 from transformers import AutoProcessor, AutoTokenizer, Qwen2_5_VLForConditionalGeneration
 from qwen_vl_utils import process_vision_info
 
@@ -72,7 +77,12 @@ processor = AutoProcessor.from_pretrained(model_path)
 url = "https://github.com/LLaVA-VL/blog/blob/main/2024-10-03-llava-critic/static/images/critic_img_seven.png?raw=True"
 image = Image.open(requests.get(url, stream=True).raw)
 
-prompt_text = f'Given an image and a corresponding question, please serve as an unbiased and fair judge to evaluate the quality of the answers provided by a Large Multimodal Model (LMM). Determine which answer is better and explain your reasoning with specific details. Your task is provided as follows:\nQuestion: [What this image presents?]\nThe first response: [The image is a black and white sketch of a line that appears to be in the shape of a cross. The line is a simple and straightforward representation of the cross shape, with two straight lines intersecting at a point.]\nThe second response: [This is a handwritten number seven.]\nASSISTANT:\n'
+prompt_text = f'Given an image and a corresponding question, please serve as an unbiased and fair judge to evaluate the quality of the answers provided by a Large Multimodal Model (LMM). Determine which answer is better and explain your reasoning with specific details. Your task is provided as follows:\
+Question: [What this image presents?]\
+The first response: [The image is a black and white sketch of a line that appears to be in the shape of a cross. The line is a simple and straightforward representation of the cross shape, with two straight lines intersecting at a point.]\
+The second response: [This is a handwritten number seven.]\
+ASSISTANT:\
+'
 
 messages = [
     {
@@ -109,11 +119,11 @@ print(output)
 
 ## Citation
 
-```
-@article{unifiedreward,
-  title={Unified reward model for multimodal understanding and generation},
-  author={Wang, Yibin and Zang, Yuhang and Li, Hao and Jin, Cheng and Wang, Jiaqi},
-  journal={arXiv preprint arXiv:2503.05236},
+```bibtex
+@article{Pref-GRPO&UniGenBench,
+  title={Pref-GRPO: Pairwise Preference Reward-based GRPO for Stable Text-to-Image Reinforcement Learning},
+  author={Wang, Yibin and Li, Zhimin and Zang, Yuhang and Zhou, Yujie and Bu, Jiazi and Wang, Chunyu and Lu, Qinglin, and Jin, Cheng and Wang, Jiaqi},
+  journal={arXiv preprint arXiv:2508.20751},
   year={2025}
 }
 ```