  Despite large-scale diffusion models being highly capable of generating
diverse open-world content, they still struggle to match the photorealism and
fidelity of concept-specific generators. In this work, we present the task of
customizing large-scale diffusion priors for specific concepts as
concept-centric personalization. Our goal is to generate high-quality
concept-centric images while maintaining the versatile controllability inherent
to open-world models, enabling applications in diverse tasks such as
concept-centric stylization and image translation. To tackle these challenges,
we identify catastrophic forgetting of guidance prediction from diffusion
priors as the fundamental issue. Consequently, we develop a guidance-decoupled
personalization framework specifically designed to address this task. We
propose Generalized Classifier-free Guidance (GCFG) as the foundational theory
for our framework. This approach extends Classifier-free Guidance (CFG) to
accommodate an arbitrary number of guidances, sourced from a variety of
conditions and models. Employing GCFG enables us to separate conditional
guidance into two distinct components: concept guidance for fidelity and
control guidance for controllability. This division makes it feasible to train
a specialized model for concept guidance, while ensuring both control and
unconditional guidance remain intact. We then present a null-text
Concept-centric Diffusion Model as a concept-specific generator to learn
concept guidance without the need for text annotations. Code will be available
at https://github.com/PRIV-Creation/Concept-centric-Personalization.
