Analysis of Classifier-Free Guidance Weight Schedulers

Analysis of Classifier-Free Guidance Weight Schedulers

19 Apr 2024 | Xi Wang, Nicolas Dufour, Nefeli Andreou, Marie-Paule Cani, Victoria Fernández Abrevaya, David Picard, Vicky Kalogeiton
The paper "Analysis of Classifier-Free Guidance Weight Schedulers" by Xi Wang, Nicolas Dufour, Nefeli Andreou, Marie-Paule Cani, Victoria Fernández Abrevaya, David Picard, and Vicky Kalogeiton explores the impact of dynamic guidance weight schedulers in Classifier-Free Guidance (CFG) models. CFG enhances the quality and condition adherence of text-to-image diffusion models by combining conditional and unconditional predictions using a fixed weight. The authors investigate both heuristic and parametrized dynamic schedulers to improve the trade-off between detailed but fuzzy images (low guidance) and sharp but simplistic images (high guidance). Key findings include: 1. **Monotonically Increasing Schedulers**: Simple, monotonically increasing weight schedulers consistently improve performance, requiring minimal code and no additional tuning. 2. **Heuristic Schedulers**: Heuristic schedulers (linear and cosine) outperform static guidance, improving image fidelity, diversity, and textual adherence. 3. **Parametrized Schedulers**: While parametrized schedulers can further enhance performance, their optimal parameters do not generalize across different models and tasks, necessitating careful tuning. The paper provides a comprehensive benchmark of various schedulers across different tasks, focusing on fidelity, diversity, and textual adherence. The findings are supported by quantitative and qualitative results, including user studies, and offer practical guidance for practitioners using CFG models.The paper "Analysis of Classifier-Free Guidance Weight Schedulers" by Xi Wang, Nicolas Dufour, Nefeli Andreou, Marie-Paule Cani, Victoria Fernández Abrevaya, David Picard, and Vicky Kalogeiton explores the impact of dynamic guidance weight schedulers in Classifier-Free Guidance (CFG) models. CFG enhances the quality and condition adherence of text-to-image diffusion models by combining conditional and unconditional predictions using a fixed weight. The authors investigate both heuristic and parametrized dynamic schedulers to improve the trade-off between detailed but fuzzy images (low guidance) and sharp but simplistic images (high guidance). Key findings include: 1. **Monotonically Increasing Schedulers**: Simple, monotonically increasing weight schedulers consistently improve performance, requiring minimal code and no additional tuning. 2. **Heuristic Schedulers**: Heuristic schedulers (linear and cosine) outperform static guidance, improving image fidelity, diversity, and textual adherence. 3. **Parametrized Schedulers**: While parametrized schedulers can further enhance performance, their optimal parameters do not generalize across different models and tasks, necessitating careful tuning. The paper provides a comprehensive benchmark of various schedulers across different tasks, focusing on fidelity, diversity, and textual adherence. The findings are supported by quantitative and qualitative results, including user studies, and offer practical guidance for practitioners using CFG models.
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[slides and audio] Analysis of Classifier-Free Guidance Weight Schedulers