Bibliographic Information: Miao, Y., Loh, W., Kothawade, S., Poupart, P., Rashwan, A., & Li, Y. (2024). Subject-driven Text-to-Image Generation via Preference-based Reinforcement Learning. Advances in Neural Information Processing Systems, 36.
Research Objective: This paper aims to address the limitations of existing text-to-image generation models in accurately portraying specific subjects from reference images while adhering to textual prompts. The authors propose a novel method, Reward Preference Optimization (RPO), to improve the fidelity of generated images to both reference images and textual descriptions.
Methodology: RPO leverages a novel λ-Harmonic reward function that combines image-to-image and text-to-image alignment scores to guide the training process. This function enables early stopping to prevent overfitting to reference images and accelerates training. The method utilizes the Bradley-Terry preference model to generate preference labels from the reward function, guiding a preference-based reinforcement learning algorithm to fine-tune a pre-trained diffusion model.
Key Findings: RPO demonstrates superior performance compared to existing state-of-the-art methods on the DreamBench dataset, achieving a CLIP-I score of 0.833 and a CLIP-T score of 0.314. The ablation study highlights the importance of both the λ-Harmonic reward function and the preference loss in achieving these results. The λ-Harmonic reward function effectively guides the model towards generating images faithful to both reference images and textual prompts, while the preference loss acts as a regularizer, preventing overfitting to the reference images.
Main Conclusions: RPO presents a more efficient and effective approach for subject-driven text-to-image generation compared to existing methods. The proposed λ-Harmonic reward function and the use of preference-based reinforcement learning contribute significantly to its superior performance in generating high-fidelity images that accurately reflect both the subject and the textual description.
Significance: This research significantly contributes to the field of text-to-image generation by introducing a novel reward function and a more efficient training approach. RPO's ability to generate high-fidelity images faithful to both reference images and textual prompts has significant implications for various applications, including content creation, image editing, and design.
Limitations and Future Research: While RPO demonstrates promising results, the authors acknowledge limitations regarding the sensitivity of the λ-Harmonic reward function to the choice of λ value. Future research could explore methods for automatically determining the optimal λ value or investigate alternative reward functions less sensitive to hyperparameter tuning. Additionally, exploring the application of RPO to other text-to-image generation tasks beyond subject-driven generation could further validate its effectiveness and broader applicability.
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by Yanting Miao... alle arxiv.org 11-01-2024
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