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K-LoRA: Unlocking Training-Free Fusion of Any Subject and Style LoRAs

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arxiv 2502.18461 v2 pith:H5GVJVMJ submitted 2025-02-25 cs.CV

classification cs.CV
keywords stylesubjecteffectivelyfusionlorak-loralearnedloras
verification ladder T0 review T1 audit T2 compute T3 formal
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Recent studies have explored combining different LoRAs to jointly generate learned style and content. However, existing methods either fail to effectively preserve both the original subject and style simultaneously or require additional training. In this paper, we argue that the intrinsic properties of LoRA can effectively guide diffusion models in merging learned subject and style. Building on this insight, we propose K-LoRA, a simple yet effective training-free LoRA fusion approach. In each attention layer, K-LoRA compares the Top-K elements in each LoRA to be fused, determining which LoRA to select for optimal fusion. This selection mechanism ensures that the most representative features of both subject and style are retained during the fusion process, effectively balancing their contributions. Experimental results demonstrate that the proposed method effectively integrates the subject and style information learned by the original LoRAs, outperforming state-of-the-art training-based approaches in both qualitative and quantitative results.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. DreamStyle3D: Efficient 3D Stylized Asset Generation via Dual-Attention Disentanglement

    cs.CV 2026-07 conditional novelty 6.0 of 10

    Decoupled dual cross-attention plus style/content augmentations let a TRELLIS-based model inject image style into 3D assets in ~10s while better preserving geometry than prior 2D-to-3D pipelines.

  2. TARA: Token-Aware LoRA for Composable Personalization in Diffusion Models

    cs.CV 2025-08 conditional novelty 6.0 of 10

    TARA adds token-focused masking and a token alignment loss to LoRA adapters, allowing several independently trained personalized adapters to be composed with less identity loss and feature leakage.

  3. FreeLoRA: Enabling Training-Free LoRA Fusion for Autoregressive Multi-Subject Personalization

    cs.CV 2025-07 conditional novelty 6.0 of 10

    A method for multi-subject image personalization that fuses independently trained LoRA modules at inference time on visual autoregressive models.

  4. LiON-LoRA: Rethinking LoRA Fusion to Unify Controllable Spatial and Temporal Generation for Video Diffusion

    cs.CV 2025-07 conditional novelty 5.0 of 10

    LiON-LoRA adds a learned scaling token to video-diffusion LoRA adapters, enabling linear and independent control of camera trajectory and object motion strength.

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