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arXiv · 2603.23069

AuthorMix: Modular Authorship Style Transfer via Layer-wise Adapter Mixing

Sarubi Thillainathan·Ji-Ung Lee·Michael Sullivan·Alexander Koller
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Abstract

The task of authorship style transfer involves rewriting text in the style of a target author while preserving the meaning of the original text. Existing style transfer methods train a single model on large corpora to model all target styles at once: this high-cost approach offers limited flexibility for target-specific adaptation, and often sacrifices meaning preservation for style transfer. In this paper, we propose AuthorMix: a lightweight, modular, and interpretable style transfer framework. We train individual, style-specific LoRA adapters on a small set of high-resource authors, allowing the rapid training of specialized adaptation models for each new target via learned, layer-wise adapter mixing, using only a handful of target-style training examples. AuthorMix outperforms existing, SoTA style-transfer baselines-as well as GPT-5.1-for low-resource targets, achieving the highest overall score and substantially improving meaning preservation in both automatic and human evaluations.

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Sarubi Thillainathan, Ji-Ung Lee, Michael Sullivan, Alexander Koller. 2026-03-24. AuthorMix: Modular Authorship Style Transfer via Layer-wise Adapter Mixing. https://arxiv.org/abs/2603.23069

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