---
license: mit
pipeline_tag: image-classification
tags:
- vision
- vit
- image-classification
---

# Thicker and Quicker: A Jumbo Token for Fast Plain Vision Transformers (ICLR 2026)

This repository contains the weights for **Jumbo**, a simple and scalable architecture that makes Vision Transformers (ViTs) faster. Jumbo reduces patch token width while increasing global token width through a new "Jumbo" token processed by a shared, wider FFN.

- **Paper:** [Thicker and Quicker: A Jumbo Token for Fast Plain Vision Transformers](https://arxiv.org/abs/2502.15021)
- **GitHub Repository:** [https://github.com/antofuller/jumbo](https://github.com/antofuller/jumbo)

## Model Description

ViTs are general and accurate, but often slow. Jumbo addresses this by reducing patch token width while adding a wider Jumbo token processed by its own wider FFN. This approach increases model capacity efficiently: the Jumbo FFN processes only a single token for speed, and its parameters are shared across all layers for memory efficiency. Crucially, Jumbo is attention-only and non-hierarchical, maintaining compatibility with plain ViT methods.

## ImageNet-1K Performance

The following accuracies were achieved on ImageNet-1K:

| Model | Top-1 Accuracy |
| :--- | :--- |
| Jumbo-pico | 69.156% |
| Jumbo-nano | 74.528% |
| Jumbo-tiny | 78.366% |
| Jumbo-small | 82.558% |
| Jumbo-base | 84.954% |

## Usage

For installation and running ImageNet-1K evals, attention visualization, and speed measurement, please follow the instructions in the official repository.

### Installation
```bash
pip install -r requirements.txt
```

### Evaluation
```bash
python eval_i1k.py --model_path YOUR_PATH/jumbo_small.pth --model_size small
```

### Measuring Speed
```bash
python measure_speed.py --model_size small
```

### Visualizing Attention Maps
```bash
python visualize_attn.py --model_path YOUR_PATH/jumbo_small.pth --model_size small --out_dir YOUR_PATH/attn_maps --num_images 50
```

## Citation

```bibtex
@article{fuller2025thicker,
  title={Thicker and Quicker: A Jumbo Token for Fast Plain Vision Transformers},
  author={Fuller, Anthony and Yassin, Yousef and Kyrollos, Daniel G. and Shelhamer, Evan and Green, James R.},
  journal={arXiv preprint arXiv:2502.15021},
  year={2025}
}
```