Diffusion Tuning: Transferring Diffusion Models via Chain of Forgetting

TL;DR

Diff-Tuning is a simple transfer method for diffusion models that leverages the chain of forgetting phenomenon, improving transfer performance and convergence speed in downstream tasks.

Contribution

The paper introduces Diff-Tuning, a novel transfer approach based on the chain of forgetting in diffusion models, with theoretical insights and practical benefits.

Findings

26% improvement over standard fine-tuning

24% faster convergence of ControlNet

Effective transfer across multiple downstream tasks

Abstract

Diffusion models have significantly advanced the field of generative modeling. However, training a diffusion model is computationally expensive, creating a pressing need to adapt off-the-shelf diffusion models for downstream generation tasks. Current fine-tuning methods focus on parameter-efficient transfer learning but overlook the fundamental transfer characteristics of diffusion models. In this paper, we investigate the transferability of diffusion models and observe a monotonous chain of forgetting trend of transferability along the reverse process. Based on this observation and novel theoretical insights, we present Diff-Tuning, a frustratingly simple transfer approach that leverages the chain of forgetting tendency. Diff-Tuning encourages the fine-tuned model to retain the pre-trained knowledge at the end of the denoising chain close to the generated data while discarding the other noise side. We conduct comprehensive experiments to evaluate Diff-Tuning, including the transfer of pre-trained Diffusion Transformer models to eight downstream generations and the adaptation of Stable Diffusion to five control conditions with ControlNet. Diff-Tuning achieves a 26% improvement over standard fine-tuning and enhances the convergence speed of ControlNet by 24%. Notably, parameter-efficient transfer learning techniques for diffusion models can also benefit from Diff-Tuning.