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Wenchao Xu

27 accepted papers

2026

Causality-inspired Federated Learning for Dynamic Spatio-Temporal Graphs

AAAI 2026technical

Federated Graph Learning (FGL) has emerged as a powerful paradigm for decentralized training of graph neural networks while preserving data privacy. However, existing FGL methods are predominantly designed for static graphs and rely on parameter averaging or distribution alignment, which implicitly

Cited by 0SourcePDFScholar
2026

Distilling Cross-Modal Knowledge via Feature Disentanglement

AAAI 2026technical

Knowledge distillation (KD) has proven highly effective for compressing large models and enhancing the performance of smaller ones. However, its effectiveness diminishes in cross-modal scenarios, such as vision-to-language distillation, where inconsistencies in representation across modalities lead

Cited by 0SourcePDFScholar
2026

OmniVGGT: Omni-Modality Driven Visual Geometry Grounded Transformer

CVPR 2026

General 3D foundation models have started to lead the trend of unifying diverse vision tasks, yet most assume RGB-only inputs and ignore readily available geometric cues (e.g., camera intrinsics, poses, and depth maps). To address this issue, we introduce OmniVGGT, a novel framework that can effecti

Cited by 0SourcecodeScholar
2025

BSemiFL: Semi-supervised Federated Learning via a Bayesian Approach

ICML 2025poster

Semi-supervised Federated Learning (SSFL) is a promising approach that allows clients to collaboratively train a global model in the absence of their local data labels. The key step of SSFL is the re-labeling where each client adopts two types of available models, namely global and local models, to…

Cited by 0SourcePDFScholar
2025

Boosting Fine-Grained Visual Anomaly Detection with Coarse-Knowledge-Aware Adversarial Learning

AAAI 2025technical

Many unsupervised visual anomaly detection methods train an auto-encoder to reconstruct normal samples and then leverage the reconstruction error map to detect and localize the anomalies. However, due to the powerful modeling and generalization ability of neural networks, some anomalies can also be…

2025

ChatbotID: Identifying Chatbots with Granger Causality Test

NeurIPS 2025poster

With the increasing sophistication of Large Language Models (LLMs), it is crucial to develop reliable methods to accurately identify whether an interlocutor in real-time dialogue is human or chatbot. However, existing detection methods are primarily designed for analyzing full documents, not the uni…

Cited by 0SourceScholar
2025

Feature Distillation is the Better Choice for Model-Heterogeneous Federated Learning

NeurIPS 2025poster

Model-Heterogeneous Federated Learning (Hetero-FL) has attracted growing attention for its ability to aggregate knowledge from heterogeneous models while keeping private data locally. To better aggregate knowledge from clients, ensemble distillation, as a widely used and effective technique, is ofte…

Cited by 0SourceScholar
2025

LLM at Network Edge: A Layer-wise Efficient Federated Fine-tuning Approach

NeurIPS 2025poster

Fine-tuning large language models (LLMs) poses significant computational burdens, especially in federated learning (FL) settings. We introduce Layer-wise Efficient Federated Fine-tuning (LEFF), a novel method designed to enhance the efficiency of FL fine-tuning while preserving model performance and…

Cited by 0SourceScholar
2025

Self-Introspective Decoding: Alleviating Hallucinations for Large Vision-Language Models

ICLR 2025poster

Hallucination remains a significant challenge in Large Vision-Language Models (LVLMs). To alleviate this issue, some methods, known as contrastive decoding, induce hallucinations by manually disturbing the raw vision or instruction inputs and then mitigate them by contrasting the outputs of the orig…

2024

Amend to Alignment: Decoupled Prompt Tuning for Mitigating Spurious Correlation in Vision-Language Models

ICML 2024poster

Fine-tuning the learnable prompt for a pre-trained vision-language model (VLM), such as CLIP, has demonstrated exceptional efficiency in adapting to a broad range of downstream tasks. Existing prompt tuning methods for VLMs do not distinguish spurious features introduced by biased training data from…

Cited by 4SourcePDFScholar
2024

C2KD: Bridging the Modality Gap for Cross-Modal Knowledge Distillation

CVPR 2024highlight

Existing Knowledge Distillation (KD) methods typically focus on transferring knowledge from a large-capacity teacher to a low-capacity student model achieving substantial success in unimodal knowledge transfer. However existing methods can hardly be extended to Cross-Modal Knowledge Distillation (CM…

Cited by 30SourcePDFScholar
2024

Contamination-Resilient Anomaly Detection via Adversarial Learning on Partially-Observed Normal and Anomalous Data

ICML 2024poster

Many existing anomaly detection methods assume the availability of a large-scale normal dataset. But for many applications, limited by resources, removing all anomalous samples from a large un-labeled dataset is unrealistic, resulting in contaminated datasets. To detect anomalies accurately under su…

Cited by 1SourcePDFScholar
2024

Cross-modal Representation Flattening for Multi-modal Domain Generalization

NeurIPS 2024poster

Multi-modal domain generalization (MMDG) requires that models trained on multi-modal source domains can generalize to unseen target distributions with the same modality set. Sharpness-aware minimization (SAM) is an effective technique for traditional uni-modal domain generalization (DG), however, wi…

Cited by 2SourcePDFScholar
2024

Disentangle Estimation of Causal Effects from Cross-Silo Data

ICASSP 2024accepted

Estimating causal effects among different events is of great importance to critical fields such as drug development. Nevertheless, the data features associated with events may be distributed across various silos and remain private within respective parties, impeding direct information exchange betwe…

Cited by 0SourceScholar
2024

FedBAT: Communication-Efficient Federated Learning via Learnable Binarization

ICML 2024poster

Federated learning is a promising distributed machine learning paradigm that can effectively exploit large-scale data without exposing users' privacy. However, it may incur significant communication overhead, thereby potentially impairing the training efficiency. To address this challenge, numerous…

2024

Knowledge-Aware Parameter Coaching for Personalized Federated Learning

AAAI 2024technical

Personalized Federated Learning (pFL) can effectively exploit the non-IID data from distributed clients by customizing personalized models. Existing pFL methods either simply take the local model as a whole for aggregation or require significant training overhead to induce the inter-client personali…

Cited by 8SourcePDFScholar
2024

Non-exemplar Online Class-Incremental Continual Learning via Dual-Prototype Self-Augment and Refinement

AAAI 2024technical

This paper investigates a new, practical, but challenging problem named Non-exemplar Online Class-incremental continual Learning (NO-CL), which aims to preserve the discernibility of base classes without buffering data examples and efficiently learn novel classes continuously in a single-pass (i.e.,…

Cited by 16SourcePDFScholar
2024

Personalized Federated Domain-Incremental Learning based on Adaptive Knowledge Matching

ECCV 2024poster

"This paper focuses on Federated Domain-Incremental Learning (FDIL) where each client continues to learn incremental tasks where their domain shifts from each other. We propose a novel adaptive knowledge matching-based personalized FDIL approach (pFedDIL) which allows each client to alternatively ut…

Cited by 21SourcePDFScholar
2024

ProCC: Progressive Cross-Primitive Compatibility for Open-World Compositional Zero-Shot Learning

AAAI 2024technical

Open-World Compositional Zero-shot Learning (OW-CZSL) aims to recognize novel compositions of state and object primitives in images with no priors on the compositional space, which induces a tremendously large output space containing all possible state-object compositions. Existing works either lear…

2023

DaFKD: Domain-Aware Federated Knowledge Distillation

CVPR 2023poster

Federated Distillation (FD) has recently attracted increasing attention for its efficiency in aggregating multiple diverse local models trained from statistically heterogeneous data of distributed clients. Existing FD methods generally treat these models equally by merely computing the average of th…

Cited by 78SourcePDFScholar
2023

PMR: Prototypical Modal Rebalance for Multimodal Learning

CVPR 2023poster

Multimodal learning (MML) aims to jointly exploit the common priors of different modalities to compensate for their inherent limitations. However, existing MML methods often optimize a uniform objective for different modalities, leading to the notorious "modality imbalance" problem and counterproduc…

2023

SwapPrompt: Test-Time Prompt Adaptation for Vision-Language Models

NeurIPS 2023poster

Test-time adaptation (TTA) is a special and practical setting in unsupervised domain adaptation, which allows a pre-trained model in a source domain to adapt to unlabeled test data in another target domain. To avoid the computation-intensive backbone fine-tuning process, the zero-shot generalization…

Cited by 43SourcePDFScholar
2023

Towards Unbiased Training in Federated Open-world Semi-supervised Learning

ICML 2023poster

Federated Semi-supervised Learning (FedSSL) has emerged as a new paradigm for allowing distributed clients to collaboratively train a machine learning model over scarce labeled data and abundant unlabeled data. However, existing works for FedSSL rely on a closed-world assumption that all local train…

Cited by 13SourcePDFScholar
2021

Parameterized Knowledge Transfer for Personalized Federated Learning

NeurIPS 2021poster

In recent years, personalized federated learning (pFL) has attracted increasing attention for its potential in dealing with statistical heterogeneity among clients. However, the state-of-the-art pFL methods rely on model parameters aggregation at the server side, which require all models to have the…

Cited by 237SourcePDFScholar