Dynamic Concepts Personalization from Single Videos

TL;DR

This paper introduces Set-and-Sequence, a novel framework for personalizing text-to-video models to capture dynamic concepts by learning appearance and motion through a two-stage fine-tuning process, enabling better editability and compositionality.

Contribution

It proposes a new spatio-temporal weight space for DiT-based models, allowing dynamic concept personalization from single videos with a two-stage LoRA fine-tuning approach.

Findings

Effective embedding of dynamic concepts into video models.

Enhanced editability and compositionality of personalized videos.

Sets a new benchmark for dynamic concept personalization.

Abstract

Personalizing generative text-to-image models has seen remarkable progress, but extending this personalization to text-to-video models presents unique challenges. Unlike static concepts, personalizing text-to-video models has the potential to capture dynamic concepts, i.e., entities defined not only by their appearance but also by their motion. In this paper, we introduce Set-and-Sequence, a novel framework for personalizing Diffusion Transformers (DiTs)-based generative video models with dynamic concepts. Our approach imposes a spatio-temporal weight space within an architecture that does not explicitly separate spatial and temporal features. This is achieved in two key stages. First, we fine-tune Low-Rank Adaptation (LoRA) layers using an unordered set of frames from the video to learn an identity LoRA basis that represents the appearance, free from temporal interference. In the second stage, with the identity LoRAs frozen, we augment their coefficients with Motion Residuals and fine-tune them on the full video sequence, capturing motion dynamics. Our Set-and-Sequence framework results in a spatio-temporal weight space that effectively embeds dynamic concepts into the video model's output domain, enabling unprecedented editability and compositionality while setting a new benchmark for personalizing dynamic concepts.