arXiv Computer Vision By Chuheng Chen, Xiaofei Zhou, Geyuan Zhang, Yong Huang, Gang Xiong

NP-LoRA: Null Space Projection for Subject-Style LoRA Fusion

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NP-LoRA introduces a training‑free method for fusing subject and style LoRAs by projecting the content LoRA onto the null space of the style LoRA, thereby reducing interference from overlapping low‑rank subspaces. The approach uses a soft projection that balances content preservation and style suppression, offering a single‑parameter interpolation between linear merging and hard projection. Experiments on multiple pretrained LoRA pairs demonstrate that NP-LoRA achieves more balanced content‑style composition than strong baselines without retraining.

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