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Analysis of Classifier-Free Guidance Weight Schedulers

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arxiv 2404.13040 v2 pith:NTCTJ2K5 submitted 2024-04-19 cs.CV cs.LG

Analysis of Classifier-Free Guidance Weight Schedulers

classification cs.CV cs.LG
keywords schedulersweightanalysisclassifier-freediffusionguidancemodelsacross
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 weights throughout the diffusion process, reporting superior results but without providing any rationale or analysis. By conducting comprehensive experiments, this paper provides insights into CFG weight schedulers. Our findings suggest that simple, monotonically increasing weight schedulers consistently lead to improved performances, requiring merely a single line of code. In addition, more complex parametrized schedulers can be optimized for further improvement, but do not generalize across different models and tasks.

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Forward citations

Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Guidance Is Not a Hyperparameter: Learning Dynamic Control in Diffusion Language Models

    cs.CL 2026-05 unverdicted novelty 7.0

    Adaptive guidance trajectories learned via PPO outperform fixed-scale CFG on controllability-quality balance in three controlled NLP generation tasks with discrete diffusion models.

  2. VAGS: Velocity Adaptive Guidance Scale for Image Editing and Generation

    cs.CV 2026-05 accept novelty 6.0

    VAGS adapts the CFG scale at each ODE step using velocity alignment signals to raise structural fidelity in editing and sample quality in generation over fixed-scale baselines.

  3. C$^2$FG: Control Classifier-Free Guidance via Score Discrepancy Analysis

    cs.LG 2026-03 unverdicted novelty 6.0

    C²FG provides a time-dependent exponential decay control for classifier-free guidance based on theoretical upper bounds on conditional-unconditional score discrepancies in diffusion processes.

  4. C$^2$FG: Control Classifier-Free Guidance via Score Discrepancy Analysis

    cs.LG 2026-03 unverdicted novelty 5.0

    C²FG provides a time-dependent guidance controller for diffusion models derived from score discrepancy upper bounds, implemented as an exponential decay function without retraining.

  5. GDiffuSE: Diffusion-based speech enhancement with noise model guidance

    cs.SD 2025-10 reject novelty 5.0

    GDiffuSE steers a frozen speech-diffusion generator toward clean speech using a lightweight noise-model likelihood adapted from a short reference noise clip, improving PESQ/SI-SDR on mismatched BBC noise.

  6. DiffIER: Optimizing Diffusion Models with Iterative Error Reduction

    cs.CV 2025-08 reject novelty 4.0

    DiffIER claims that iteratively minimizing the distance between a diffusion model's predicted noise and a random Gaussian sample at each inference step improves generation quality.