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arXiv · 2602.00886

RoDiF: Robust Direct Fine-Tuning of Diffusion Policies with Corrupted Human Feedback

Amitesh Vatsa·Zhixian Xie·Wanxin Jin
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Abstract

Diffusion policies are a powerful paradigm for robotic control, but fine-tuning them with human preferences is fundamentally challenged by the multi-step structure of the denoising process. To overcome this, we introduce a Unified Markov Decision Process (MDP) formulation that coherently integrates the diffusion denoising chain with environmental dynamics, enabling reward-free Direct Preference Optimization (DPO) for diffusion policies. Building on this formulation, we propose RoDiF (Robust Direct Fine-Tuning), a method that explicitly addresses corrupted human preferences. RoDiF reinterprets the DPO objective through a geometric hypothesis-cutting perspective and employs a conservative cutting strategy to achieve robustness without assuming any specific noise distribution. Extensive experiments on long-horizon manipulation tasks show that RoDiF consistently outperforms state-of-the-art baselines, effectively steering pretrained diffusion policies of diverse architectures to human-preferred modes, while maintaining strong performance even under 30% corrupted preference labels.

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Amitesh Vatsa, Zhixian Xie, Wanxin Jin. 2026-01-31. RoDiF: Robust Direct Fine-Tuning of Diffusion Policies with Corrupted Human Feedback. https://arxiv.org/abs/2602.00886

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