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Xiaojun Chen

29 accepted papers

2026

ARGH-Mark: Anchor-Synchronized Watermarking with Hamming Correction for Robust and Quality-Preserving LLM Attribution

AAAI 2026technical

The proliferation of large language models has intensified demands for reliable content attribution, yet existing watermarking techniques face a fundamental trilemma: they cannot simultaneously optimize for robustness against attacks, minimal text quality degradation, and detection efficiency. To re

Cited by 0SourcePDFScholar
2026

ChartR: Evaluating Reasoning Accuracy and Robustness in Chart Question Answering

CVPR 2026

Chart Question Answering (CQA) benchmarks are critical for evaluating Multimodal Large Language Models (MLLMs) on visual data reasoning. Existing benchmarks focus mainly on final-answer correctness, ignoring intermediate reasoning steps and the propagation of errors in multi-step processes. To addre

Cited by 0SourceScholar
2026

DeepTracer: Tracing Stolen Model via Deep Coupled Watermarks

AAAI 2026technical

Model watermarking techniques can embed watermark information into the protected model for ownership declaration by constructing specific input-output pairs. However, existing watermarks are easily removed when facing model stealing attacks, and make it difficult for model owners to effectively veri

Cited by 0SourcePDFScholar
2026

Exposing Functional Fusion: A New Class of Strategic Backdoor in Dynamic Prompt Architectures

CVPR 2026

Existing ViT backdoor attacks based on backbone-overwriting full-tuning are computationally expensive and inflict performance degradation. This has forced adversaries towards the Visual Parameter-Efficient Fine-Tuning (PEFT) paradigm, dominated by adapter-based (e.g., LoRA) and prompt-based (e.g., V

Cited by 0SourceScholar
2026

Federated Graph Learning via Structure-Aware Fusion Using a Kalman Framework with Learnable Dynamics

ICML 2026poster

Federated Graph Learning (FGL) enables collaborative training across distributed clients without sharing raw graph data. However, its performance is severely hindered by graph-specific heterogeneity arising from divergent node feature distributions and disparate graph structures. Existing FGL method…

Cited by 0SourceScholar
2026

LiNeXt: Revisiting LiDAR Completion with Efficient Non-Diffusion Architectures

AAAI 2026technical

3D LiDAR scene completion from point clouds is a fundamental component of perception systems in autonomous vehicles. Previous methods have predominantly employed diffusion models for high‑fidelity reconstruction. However, their multi-step iterative sampling incurs significant computational overhead,

Cited by 0SourcePDFScholar
2026

PointSLAM++: Robust Dense Neural Gaussian Point Cloud-based SLAM

AAAI 2026technical

Real-time 3D reconstruction is crucial for robotics and augmented reality, yet current simultaneous localization and mapping(SLAM) approaches often struggle to maintain structural consistency and robust pose estimation in the presence of depth noise. This work introduces PointSLAM++, a novel RGB-D S

Cited by 0SourcePDFScholar
2026

Rel-Zero: Harnessing Patch-Pair Invariance for Robust Zero-Watermarking Against AI Editing

CVPR 2026

Recent advancements in diffusion-based image editing pose a significant threat to the authenticity of digital visual content. Traditional embedding-based watermarking methods often introduce perceptible perturbations to maintain robustness, inevitably compromising visual fidelity. Meanwhile, existin

Cited by 0SourcecodeScholar
2026

Value-Aligned Prompt Moderation via Zero-Shot Agentic Rewriting for Safe Image Generation

AAAI 2026technical

Generative vision-language models like Stable Diffusion demonstrate remarkable capabilities in creative media synthesis, but they also pose substantial risks of producing unsafe, offensive, or culturally inappropriate content when prompted adversarially. Current defenses struggle to align outputs wi

Cited by 0SourcePDFScholar
2025

DRTT : A Diffusion-based Framework for 4DCT Generation, Robust Thoracic Registration and Tumor Deformation Tracking

IROS 2025

In minimally invasive robotic thoracic surgery, the unavoidable respiratory motion of the patient causes lung lesions to move and deform, making precise tumor localiza-tion a significant challenge for surgeons. To address this, we introduce an RDDM (Recursive Deformable Diffusion Model)-based framew

Cited by 0SourceScholar
2025

TGLsta: Low-resource Textual Graph Learning with Semantic and Topological Awareness via LLMs

AAAI 2025technical

Textual Graphs (TGs) present a graph-based representation of textual data and find wide applications in real-world scenarios, such as citation networks, knowledge graphs, and social networks. While the traditional "pre-train, fine-tune" framework effectively addresses tasks requiring abundant labele…

Cited by 0SourcePDFScholar
2025

Take Attention Inside: Neighbor Pair Graph Contrastive Learning

ICASSP 2025accepted

Graph Contrastive Learning(GCL) is a fundamental pretraining research method in Graph Neural Networks (GNNs), which puts rich graph-level insights into the graph data to augment the data representation. However, since the existing GCLs generally regard the intra-layer node as negative samples, they…

Cited by 0SourceScholar
2025

Watermarking with Low-Entropy POS-Guided Token Partitioning and Z-Score-Driven Dynamic Bias for Large Language Models

EMNLP 2025

Texts generated by large language models (LLMs) are increasingly widespread online. Due to the lack of effective attribution mechanisms, the enforcement of copyright and the prevention of misuse remain significant challenges in the context of LLM-generated content. LLMs watermark emerges as a crucia

Cited by 0SourcePDFScholar
2025

Who Speaks for the Trigger? Dynamic Expert Routing in Backdoored Mixture-of-Experts Transformers

NeurIPS 2025poster

Large language models (LLMs) with Mixture-of-Experts (MoE) architectures achieve impressive performance and efficiency by dynamically routing inputs to specialized subnetworks, known as experts. However, this sparse routing mechanism inherently exhibits task preferences due to expert specialization…

Cited by 0SourceScholar
2024

EGonc : Energy-based Open-Set Node Classification with substitute Unknowns

NeurIPS 2024poster

Open-set Classification (OSC) is a critical requirement for safely deploying machine learning models in the open world, which aims to classify samples from known classes and reject samples from out-of-distribution (OOD). Existing methods exploit the feature space of trained network and attempt at e…

Cited by 0SourcePDFScholar
2024

Enhancing Noise Robustness of Retrieval-Augmented Language Models with Adaptive Adversarial Training

ACL 2024long

Large Language Models (LLMs) exhibit substantial capabilities yet encounter challenges including hallucination, outdated knowledge, and untraceable reasoning processes. Retrieval-augmented generation (RAG) has emerged as a promising solution, integrating knowledge from external databases to mitigate…

2024

II-Bench: An Image Implication Understanding Benchmark for Multimodal Large Language Models

NeurIPS 2024poster

The rapid advancements in the development of multimodal large language models (MLLMs) have consistently led to new breakthroughs on various benchmarks. In response, numerous challenging and comprehensive benchmarks have been proposed to more accurately assess the capabilities of MLLMs. However, ther…

Cited by 7SourcePDFScholar
2024

MoZIP: A Multilingual Benchmark to Evaluate Large Language Models in Intellectual Property

COLING 2024main

Large language models (LLMs) have demonstrated impressive performance in various natural language processing (NLP) tasks. However, there is limited understanding of how well LLMs perform in specific domains (e.g, the intellectual property (IP) domain). In this paper, we contribute a new benchmark, t…

2024

ROG_PL: Robust Open-Set Graph Learning via Region-Based Prototype Learning

AAAI 2024technical

Open-set graph learning is a practical task that aims to classify the known class nodes and to identify unknown class samples as unknowns. Conventional node classification methods usually perform unsatisfactorily in open-set scenarios due to the complex data they encounter, such as out-of-distributi…

Cited by 2SourcePDFScholar
2024

Representation Surgery for Multi-Task Model Merging

ICML 2024poster

Multi-task learning (MTL) compresses the information from multiple tasks into a unified backbone to improve computational efficiency and generalization. Recent work directly merges multiple independently trained models to perform MTL instead of collecting their raw data for joint training, greatly e…

2023

A Survey for Efficient Open Domain Question Answering

ACL 2023long

Open domain question answering (ODQA) is a longstanding task aimed at answering factual questions from a large knowledge corpus without any explicit evidence in natural language processing (NLP). Recent works have predominantly focused on improving the answering accuracy and have achieved promising…

2023

G2Pxy: Generative Open-Set Node Classification on Graphs with Proxy Unknowns

IJCAI 2023poster

Node classification is the task of predicting the labels of unlabeled nodes in a graph. State-of-the-art methods based on graph neural networks achieve excellent performance when all labels are available during training. But in real-life, models are of ten applied on data with new classes, which…

2022

DEFEAT: Deep Hidden Feature Backdoor Attacks by Imperceptible Perturbation and Latent Representation Constraints

CVPR 2022poster

Backdoor attack is a type of serious security threat to deep learning models.An adversary can provide users with a model trained on poisoned data to manipulate prediction behavior in test stage using a backdoor. The backdoored models behave normally on clean images, yet can be activated and output i…

Cited by 97PDFScholar
2022

Deep Unsupervised Hashing with Latent Semantic Components

AAAI 2022technical

Deep unsupervised hashing has been appreciated in the regime of image retrieval. However, most prior arts failed to detect the semantic components and their relationships behind the images, which makes them lack discriminative power. To make up the defect, we propose a novel Deep Semantic Component…

Cited by 26SourcePDFScholar
2021

Enhancing Label Representations with Relational Inductive Bias Constraint for Fine-Grained Entity Typing

IJCAI 2021poster

Fine-Grained Entity Typing (FGET) is a task that aims at classifying an entity mention into a wide range of entity label types. Recent researches improve the task performance by imposing the label-relational inductive bias based on the hierarchy of labels or label co-occurrence graph. However, they…

Cited by 7SourcePDFScholar
2017

A Self-Balanced Min-Cut Algorithm for Image Clustering

ICCV 2017poster

Many spectral clustering algorithms have been proposed and successfully applied to image data analysis such as content based image retrieval, image annotation, and image indexing. Conventional spectral clustering algorithms usually involve a two-stage process: eigendecomposition of similarity matrix…

Cited by 62PDFScholar