📌 ICCV 2025 | Official Code Release
This repository hosts the official implementation of our ICCV 2025 paper:
"Frequency-Aware Autoregressive Modeling for Efficient High-Resolution Image Synthesis"
🔥 Up to 2× speedup for high-res image synthesis with minimal quality drop.

Visual autoregressive modeling, based on the next-scale prediction paradigm, generates images by progressively refining resolution across multiple stages. However, the computational overhead in high-resolution stages remains a challenge due to the large number of tokens.
We introduce SparseVAR, a plug-and-play acceleration framework that dynamically excludes low-frequency tokens during inference with no extra training. On Infinity-2B, SparseVAR achieves up to 2× speedup with minimal quality degradation.

📄 Method Diagram:

• ✅ No retraining required
• ⚡ Dynamic skipping of low-frequency tokens
• 🧩 Compatible with Infinity and HART
• 🚀 Up to 2× faster high-resolution inference

git clone https://github.com/Caesarhhh/SparseVAR.git
cd SparseVAR
pip install -r requirements.txt

SparseVAR/
├── infinity/                     # Infinity integration
│   ├── scripts/
│   │   ├── eval_sparsevar.sh
│   │   └── eval_baseline.sh
│   ├── weights/                  # place Infinity weights here
│   ├── evaluation/               # evaluation configs & data
│   └── cus_datasets/             
│
├── hart/                         # HART integration
│   ├── scripts/
│   │   ├── eval_sparsevar.sh
│   │   └── eval_baseline.sh
│   ├── weights/                  # place HART weights here
│   ├── evaluation/               # evaluation configs & data
│   └── cus_datasets/             
│
├── requirements.txt
└── assets/
    └── method_exit.png

⚠️ Usage: enter infinity/ or hart/ folder and run evaluation scripts.

• Download from Infinity repo:
  • infinity_2b_reg.pth
  • infinity_vae_d32_reg.pth
• Download Mask2Former:
  • mask2former_swin-s-p4-w7-224_lsj_8x2_50e_coco.pth
• Place files into:
  • infinity/weights/infinity_2b_reg.pth
  • infinity/weights/infinity_vae_d32_reg.pth
  • infinity/weights/mask2former/mask2former_swin-s-p4-w7-224_lsj_8x2_50e_coco.pth

• Download hart-0.7b-1024px
  → Place into hart/weights/
• Download Mask2Former:
  • mask2former_swin-s-p4-w7-224_lsj_8x2_50e_coco.pth → Place into hart/weights/mask2former/

• Repo: https://github.com/djghosh13/geneval
• Copy prompts/ and object_names.txt into:

  evaluation/gen_eval/
  

• Repo: https://github.com/TencentQQGYLab/ELLA
• Copy dpg_bench/ into:

  cus_datasets/dpg_bench/
  

cd infinity
bash scripts/eval_sparsevar.sh   # SparseVAR acceleration
bash scripts/eval_baseline.sh    # Baseline

cd hart
bash scripts/eval_sparsevar.sh
bash scripts/eval_baseline.sh

@inproceedings{chen2025sparsevar,
  title     = {Frequency-Aware Autoregressive Modeling for Efficient High-Resolution Image Synthesis},
  author    = {Chen, Zhuokun and Fan, Jugang and Yu, Zhuowei and Zhuang, Bohan and Tan, Mingkui},
  booktitle = {Proceedings of the IEEE/CVF International Conference on Computer Vision (ICCV)},
  year      = {2025}
}

This repository is built upon and inspired by the excellent works:

• Infinity
• HART

We thank the authors and maintainers of these repositories for open-sourcing their code and models, which made this work possible.

This repository is for academic research only. For Infinity and HART code/models, please follow their respective licenses.