---
license: apache-2.0
datasets:
- GRiP-SFT-35K
- GRiP-RL-37K
language:
- en
base_model:
- Qwen/Qwen2.5-VL-7B-Instruct
pipeline_tag: image-text-to-text
tags:
- visual-grounding
- multimodal-reasoning
- reinforcement-learning
- chain-of-thought
---

# GRiP-7B: Guiding the Inner Eye

[Arxiv](https://arxiv.org/abs/2511.22172) | [Huggingface](https://huggingface.co/TencentBAC/GRiP)

## Overview
This repository contains the official model checkpoints of **GRiP (Guided Reasoning and Perception)**, a novel visual grounded reasoning model developed by Basic Algorithm Center, Platform and Content Group, Tencent.

Models capable of "thinking with images" represent a major leap in multimodal AI. **GRiP** is designed to cultivate robust and flexible visual grounded reasoning by explicitly guiding the model's perceptual focus and logical pathways. Initialized from [Qwen2.5-VL-7B-Instruct](https://huggingface.co/Qwen/Qwen2.5-VL-7B-Instruct), GRiP employs a two-stage training framework:
1.  **Bootstrapping:** Structured instruction tuning to teach the syntax of grounded reasoning.
2.  **Policy Refinement:** A cognitive-enhanced Reinforcement Learning (RL) stage featuring novel reward mechanisms.

GRiP achieves state-of-the-art results among open-source models on challenging benchmarks like **TreeBench**, **V\* Bench**, and **HR-Bench**, demonstrating superior capability in complex visual reasoning.

## Methodology

The core of GRiP lies in its **Policy Refinement** stage, which addresses the "Coarse Reward Problem" in existing RL methods. We introduce a multi-faceted reward architecture:

$$ R_{\text{total}} = R_{\text{acc}} + R_{\text{fmt}} + R_{\text{sw-IoU}} + R_{\text{MHR}} $$

Where:
* **Salience-Weighted IoU Reward ($R_{\text{sw-IoU}}$):** Incentivizes the model to prioritize mission-critical objects over trivial distractors. It weights the recall component by an object's salience score $s_k$:
$$
R_{\text{recall}} = \frac{1}{\sum s_k} \sum_{k=1}^{M} s_k \cdot \max_{i} \text{IoU}(p_i, g_k)
$$

* **Multi-Heuristic Reward ($R_{\text{MHR}}$):** Encourages cognitive flexibility by rewarding diverse valid reasoning pathways (e.g., Bottom-Up, Top-Down, Deductive Verification). The model is rewarded based on similarity to the best-matching reference trajectory:
$$
R_{\text{MHR}} = \max_{j \in \{1,2,3\}} \text{sim}(\tau_{\text{gen}}, \tau_{\text{ref}}^j)
$$




![image](https://cdn-uploads.huggingface.co/production/uploads/66daf60cbb6e7331f46ea070/uhChByMJIAHaSC6HeeYjy.png)



## Performance

### TreeBench Evaluation
TreeBench is a highly challenging benchmark for fine-grained perception and multi-step reasoning. GRiP significantly outperforms its base model and other open-source competitors.

| Method | Base Model | Overall | mIoU | Perception | Reasoning |
| :--- | :--- | :--- | :--- | :--- | :--- |
| GPT-4o-1120 | - | 46.9 | - | - | - |
| o3-0416 | - | 54.8 | - | - | - |
| LLaVA-OneVision-72B | LLaMA-3 | 40.5 | - | 62.1 | 53.7 |
| InternVL3-78B | InternViT | 46.4 | - | 62.1 | 61.0 |
| Qwen2.5-VL-7B | Qwen2.5 | 37.0 | - | 55.2 | 39.0 |
| DeepEyes-7B | Qwen2-VL | 37.5 | 30.0 | 62.1 | 36.6 |
| Pixel-Reasoner-7B | Qwen2-VL | 39.0 | 35.7 | 58.6 | 39.0 |
| **GRiP (Ours)** | **Qwen2.5-VL-7B** | **51.3** | **45.0** | **69.1** | **58.7** |

### Generalization on V* Bench and HR-Bench
GRiP demonstrates strong generalization capabilities on attribute recognition, spatial understanding, and high-resolution reasoning.

| Method | V* Bench (Overall) | HR-Bench-4K (Overall) | HR-Bench-8K (Overall) |
| :--- | :--- | :--- | :--- |
| GPT-4o-1120 | 66.0 | - | - |
| o3-0416 | 95.7 | - | - |
| Qwen2.5-VL-7B | 74.3 | 72.1 | 68.8 |
| Qwen2.5-VL-72B | 84.8 | 79.4 | 76.3 |
| DeepEyes-7B | 90.0 | 75.1 | 72.6 |
| **GRiP (Ours)** | **91.9** | **78.6** | **75.0** |

## Train and Inference
Please refer to our [Huggingface Repository](https://huggingface.co/TencentBAC/GRiP) for training and inference codes.

### Training Details
*   **Hardware:** 8 $\times$ NVIDIA H20 (96GB) GPUs.
*   **Frameworks:** [LLaMA-Factory](https://github.com/hiyouga/LLaMA-Factory) for SFT, [EasyRL](https://github.com/hiyouga/EasyR1) for RL training.
*   **Optimization:** AdamW optimizer, GRPO algorithm for Policy Refinement.

## Acknowledgements
Our work is built upon the excellent [Qwen2.5-VL](https://huggingface.co/Qwen/Qwen2.5-VL-7B-Instruct). We also thank the developers of [LLaMA-Factory](https://github.com/hiyouga/LLaMA-Factory) and [EasyRL](https://github.com/hiyouga/EasyR1) for their efficient training frameworks.

## Citation
If you find our work helpful, please cite:
```bibtex
@article{wei2025grip,
  title={Guiding the Inner Eye: A Framework for Hierarchical and Flexible Visual Grounded Reasoning},
  author={Wei, Zhaoyang and Ding, Wenchao and Hao, Yanchao and Chen, Xi},
  journal={arXiv preprint},
  year={2025}
}