Paper Detail

SeqLoRA: Bilevel Orthogonal Adaptation for Continual Multi-Concept Generation

Javad Parsa, Enis Simsar, Amir Joudaki, Thomas Hofmann, André M. H. Teixeira

arxiv Score 23.5

Published 2026-05-21 · First seen 2026-05-25

Research Track A · General AI

Abstract

Parameter-efficient fine-tuning enables fast personalization of text-to-image diffusion models, but composing multiple custom concepts remains challenging due to representation interference. Existing modular methods either rely on expensive post-hoc fusion or freeze adaptation subspaces, which limit expressiveness and concept fidelity. To address this trade-off, we propose Sequential regularized LoRA (SeqLoRA), a constrained continual learning framework that jointly optimizes both LoRA factors via bilevel optimization. Theoretically, we establish strong convergence guarantees for our algorithm and model the residual layer activations as a matrix sub-Gaussian process to derive high-probability bounds on catastrophic forgetting. We further prove that learning the LoRA basis from data minimizes residual interference energy more effectively than frozen-basis methods. Experiments on multi-concept image generation demonstrate that SeqLoRA improves identity preservation and scalability across up to 101 concepts, while avoiding costly fusion and reducing attribute interference in composed generations.

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BibTeX

@article{parsa2026seqlora,
  title = {SeqLoRA: Bilevel Orthogonal Adaptation for Continual Multi-Concept Generation},
  author = {Javad Parsa and Enis Simsar and Amir Joudaki and Thomas Hofmann and André M. H. Teixeira},
  year = {2026},
  abstract = {Parameter-efficient fine-tuning enables fast personalization of text-to-image diffusion models, but composing multiple custom concepts remains challenging due to representation interference. Existing modular methods either rely on expensive post-hoc fusion or freeze adaptation subspaces, which limit expressiveness and concept fidelity. To address this trade-off, we propose Sequential regularized LoRA (SeqLoRA), a constrained continual learning framework that jointly optimizes both LoRA factors v},
  url = {https://arxiv.org/abs/2605.22743},
  keywords = {cs.LG},
  eprint = {2605.22743},
  archiveprefix = {arXiv},
}

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