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Classifier-Free Guidance (CFG) is a cornerstone of modern text-to-image models, yet its reliance on a semantically vacuous null prompt ($\varnothing$) generates a guidance signal prone to geometric entanglement. This is a key factor…

Computer Vision and Pattern Recognition · Computer Science 2026-03-12 Shilong Han , Yuming Zhang , Hongxia Wang

The primary axes of interest in image-generating diffusion models are image quality, the amount of variation in the results, and how well the results align with a given condition, e.g., a class label or a text prompt. The popular…

Computer Vision and Pattern Recognition · Computer Science 2024-12-20 Tero Karras , Miika Aittala , Tuomas Kynkäänniemi , Jaakko Lehtinen , Timo Aila , Samuli Laine

Classifier-Free Guidance (CFG) is an essential component of text-to-image diffusion models, and understanding and advancing its operational mechanisms remains a central focus of research. Existing approaches stem from divergent theoretical…

Computer Vision and Pattern Recognition · Computer Science 2025-10-27 Kaibo Wang , Jianda Mao , Tong Wu , Yang Xiang

In diffusion and flow-matching generative models, guidance techniques are widely used to improve sample quality and consistency. Classifier-free guidance (CFG) is the de facto choice in modern systems and achieves this by contrasting…

Computer Vision and Pattern Recognition · Computer Science 2025-12-22 Ankit Yadav , Ta Duc Huy , Lingqiao Liu

Classifier-Free Guidance (CFG), which combines the conditional and unconditional score functions with two coefficients summing to one, serves as a practical technique for diffusion model sampling. Theoretically, however, denoising with CFG…

Computer Vision and Pattern Recognition · Computer Science 2025-10-02 Mengfei Xia , Nan Xue , Yujun Shen , Ran Yi , Tieliang Gong , Yong-Jin Liu

Denoising diffusion models excel at generating high-quality images conditioned on text prompts, yet their effectiveness heavily relies on careful guidance during the sampling process. Classifier-Free Guidance (CFG) provides a widely used…

Graphics · Computer Science 2026-03-04 Shai Yehezkel , Omer Dahary , Andrey Voynov , Daniel Cohen-Or

The generation of high-quality, diverse, and prompt-aligned images is a central goal in image-generating diffusion models. The popular classifier-free guidance (CFG) approach improves quality and alignment at the cost of reduced variation,…

Machine Learning · Computer Science 2025-10-21 Enhao Gu , Haolin Hou

Classifier-free guidance (CFG) is a fundamental tool in modern diffusion models for text-guided generation. Although effective, CFG has notable drawbacks. For instance, DDIM with CFG lacks invertibility, complicating image editing;…

Computer Vision and Pattern Recognition · Computer Science 2024-09-13 Hyungjin Chung , Jeongsol Kim , Geon Yeong Park , Hyelin Nam , Jong Chul Ye

With the rapid development of text-to-vision generation diffusion models, classifier-free guidance has emerged as the most prevalent method for conditioning. However, this approach inherently requires twice as many steps for model…

Computer Vision and Pattern Recognition · Computer Science 2025-06-11 Huixuan Zhang , Junzhe Zhang , Xiaojun Wan

Classifier-Free Guidance (CFG) has been a default technique in various visual generative models, yet it requires inference from both conditional and unconditional models during sampling. We propose to build visual models that are free from…

Computer Vision and Pattern Recognition · Computer Science 2025-08-26 Huayu Chen , Kai Jiang , Kaiwen Zheng , Jianfei Chen , Hang Su , Jun Zhu

Classifier-Free Guidance (CFG) enhances the quality and condition adherence of text-to-image diffusion models. It operates by combining the conditional and unconditional predictions using a fixed weight. However, recent works vary the…

Computer Vision and Pattern Recognition · Computer Science 2025-01-23 Xi Wang , Nicolas Dufour , Nefeli Andreou , Marie-Paule Cani , Victoria Fernandez Abrevaya , David Picard , Vicky Kalogeiton

Guidance in conditional diffusion generation is of great importance for sample quality and controllability. However, existing guidance schemes are to be desired. On one hand, mainstream methods such as classifier guidance and…

Machine Learning · Computer Science 2023-10-18 Jiajun Ma , Tianyang Hu , Wenjia Wang , Jiacheng Sun

Diffusion models have recently been shown to generate high-quality synthetic images, especially when paired with a guidance technique to trade off diversity for fidelity. We explore diffusion models for the problem of text-conditional image…

Computer Vision and Pattern Recognition · Computer Science 2022-03-09 Alex Nichol , Prafulla Dhariwal , Aditya Ramesh , Pranav Shyam , Pamela Mishkin , Bob McGrew , Ilya Sutskever , Mark Chen

While Classifier-Free Guidance (CFG) has become standard for improving sample fidelity in conditional diffusion models, it can harm diversity and induce memorization by applying constant guidance regardless of whether a particular sample…

Computer Vision and Pattern Recognition · Computer Science 2025-10-10 Felix Koulischer , Florian Handke , Johannes Deleu , Thomas Demeester , Luca Ambrogioni

Classifier guidance is a recently introduced method to trade off mode coverage and sample fidelity in conditional diffusion models post training, in the same spirit as low temperature sampling or truncation in other types of generative…

Machine Learning · Computer Science 2022-07-27 Jonathan Ho , Tim Salimans

Classifier-free guidance (CFG) is a key technique for improving conditional generation in diffusion models, enabling more accurate control while enhancing sample quality. It is natural to extend this technique to video diffusion, which…

Machine Learning · Computer Science 2025-07-25 Kiwhan Song , Boyuan Chen , Max Simchowitz , Yilun Du , Russ Tedrake , Vincent Sitzmann

Classifier-free guidance (CFG) is an essential mechanism in contemporary text-driven diffusion models. In practice, in controlling the impact of guidance we can see the trade-off between the quality of the generated images and…

Computer Vision and Pattern Recognition · Computer Science 2025-02-18 Dawid Malarz , Artur Kasymov , Maciej Zięba , Jacek Tabor , Przemysław Spurek

Classifier-free guidance (CFG) has helped diffusion models achieve great conditional generation in various fields. Recently, more diffusion guidance methods have emerged with improved generation quality and human preference. However, can…

Computer Vision and Pattern Recognition · Computer Science 2026-02-27 Dian Xie , Shitong Shao , Lichen Bai , Zikai Zhou , Bojun Cheng , Shuo Yang , Jun Wu , Zeke Xie

Classifier-Free Guidance (CFG) is widely used to improve conditional fidelity in diffusion models, but its impact on sampling dynamics remains poorly understood. Prior studies, often restricted to unimodal conditional distributions or…

Machine Learning · Computer Science 2026-02-19 Cheng Jin , Qitan Shi , Yuantao Gu

Classifier-Free Guidance (CFG) is a cornerstone of modern conditional diffusion models, yet its reliance on the fixed or heuristic dynamic guidance weight is predominantly empirical and overlooks the inherent dynamics of the diffusion…

Machine Learning · Computer Science 2026-05-21 Jiayang Gao , Tianyi Zheng , Jiayang Zou , Fengxiang Yang , Shice Liu , Luyao Fan , Zheyu Zhang , Hao Zhang , Jinwei Chen , Peng-Tao Jiang , Bo Li , Jia Wang