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Author

Jian Liu

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Preprint Aug 2026

SAP-Nav: Spatial Semantic Representation Meets Active Perception for Hierarchical Open-Vocabulary Object Navigation

SAP-Nav is presented, a fully online, zero-shot framework that supports both hierarchical and standard category-level OVON without task-specific training or precomputed scene maps and is designed for hierarchical OVON without task-specific training or precomputed scene maps.

Xuetong Pei, Jian Liu, Vidura Munasinghe et al. · 1 citation
Preprint Aug 2026

DEFUSE: Generalizable Backdoor Defense for Self-Supervised Encoders with Generative Priors

Inspired by Bayesian posterior inference, this work reformulate backdoor detection as a representation-conditioned image likelihood estimation problem parameterized by a conditional diffusion generative model, and fine-tune a pretrained diffusion model, leveraging its generative prior to map data onto the natural image...

Tuo Chen, Jie Gui, Minjing Dong et al. · 0 citations
Jun 2026

The Platonic Defense: Backdoor Defense for Self-Supervised Encoders in the Era of Large Scale Pre-training

A new attack-agnostic, model-agnostic, and modality-agnostic black-box test-time defense paradigm, inspired by the Platonic Representation Hypothesis, that can perform both representation detection and purification, and achieves substantial performance gains across multiple attacks.

Tuo Chen, Minjing Dong, Benlei Cui et al. · 0 citations

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