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Zihan Chen

33 accepted papers

2026

CREval: An Automated Interpretable Evaluation for Creative Image Manipulation under Complex Instructions

CVPR 2026

Instruction-based multimodal image manipulation has recently made rapid progress. However, existing evaluation methods lack a systematic and human-aligned framework for assessing model performance on complex and creative editing tasks. To address this gap, we propose CREval, a fully automated questi

Cited by 0SourcecodeScholar
2026

Don't Let Your Robot Be Harmful: Responsible Robotic Manipulation Via Safety-As-Policy

ICRA 2026poster

Unthinking execution of human instructions in robotic manipulation can lead to severe safety risks, such as poisonings, fires, and even explosions. In this paper, we present responsible robotic manipulation, which requires robots to consider potential hazards in the real-world environment while comp…

2026

Generalist Graph Anomaly Detection via Prototype-Based Distillation

ICML 2026poster

Driven by the pressing demand for graph anomaly detection (GAD) in high-stakes domains, the generalist GAD paradigm, which trains a single detector transferable across new graphs, has recently gained growing attention. However, existing methods often rely on scarce and costly annotations for trainin…

Cited by 0SourceScholar
2026

SMILE: Extended Deep Submodular Function-Based Instruction and In-context Learning Demonstration Selection

ICML 2026poster

Prompt optimization is a key way to steer large language models when fine-tuning is impractical. However, instruction optimization (IO) and in-context learning (ICL) demonstration selection are often optimized separately and combined post hoc, implicitly assuming that a "best'' instruction and a "be…

Cited by 0SourceScholar
2026

WALKSAFE: Risk-aware Graph Random Walk with Bi-GRPO for LLM Safety

AAAI 2026technical

Large language models (LLMs) may generate harmful outputs on malicious inputs. Existing safety methods, including prompt engineering and model editing, rely on hand-crafted templates or target-driven parameter modifications, limiting their generalizability in unseen harmful scenarios. Post-training

Cited by 0SourcePDFScholar
2025

ALLabel: Three-stage Active Learning for LLM-based Entity Recognition using Demonstration Retrieval

EMNLP 2025

Many contemporary data-driven research efforts in the natural sciences, such as chemistry and materials science, require large-scale, high-performance entity recognition from scientific datasets. Large language models (LLMs) have increasingly been adopted to solve the entity recognition task, with t

Cited by 0SourcePDFScholar
2025

AnyMAC: Cascading Flexible Multi-Agent Collaboration via Next-Agent Prediction

EMNLP 2025

Recent progress in large language model (LLM)-based multi-agent collaboration highlights the power of structured communication in enabling collective intelligence. However, existing methods largely rely on static or graph-based inter-agent topologies, lacking the potential adaptability and flexibili

2025

CoRAG: Enhancing Hybrid Retrieval-Augmented Generation through a Cooperative Retriever Architecture

EMNLP 2025

Retrieval-Augmented Generation (RAG) is introduced to enhance Large Language Models (LLMs) by integrating external knowledge. However, conventional RAG approaches treat retrieved documents as independent units, often overlooking their interdependencies. Hybrid-RAG, a recently proposed paradigm that

2025

From Cross-Task Examples to In-Task Prompts: A Graph-Based Pseudo-Labeling Framework for In-context Learning

EMNLP 2025

The capability of in-context learning (ICL) enables large language models (LLMs) to perform novel tasks without parameter updates by conditioning on a few input-output examples. However, collecting high-quality examples for new or challenging tasks can be costly and labor-intensive. In this work, we

2025

GraphTOP: Graph Topology-Oriented Prompting for Graph Neural Networks

NeurIPS 2025poster

Graph Neural Networks (GNNs) have revolutionized the field of graph learning by learning expressive graph representations from massive graph data. As a common pattern to train powerful GNNs, the "pre-training, adaptation" scheme first pre-trains GNNs over unlabeled graph data and subsequently adapts…

Cited by 0SourcecodeScholar
2025

Learning from Diverse Reasoning Paths with Routing and Collaboration

EMNLP 2025

Advances in large language models (LLMs) significantly enhance reasoning capabilities but their deployment is restricted in resource-constrained scenarios. Knowledge distillation addresses this by transferring knowledge from powerful teacher models to compact and transparent students.However, effect

2025

MAPLE: Many-Shot Adaptive Pseudo-Labeling for In-Context Learning

ICML 2025poster

In-Context Learning (ICL) empowers Large Language Models (LLMs) to tackle diverse tasks by incorporating multiple input-output examples, known as demonstrations, into the input of LLMs. More recently, advancements in the expanded context windows of LLMs have led to many-shot ICL, which uses hundreds…

2025

Separate the Wheat from the Chaff: Winnowing Down Divergent Views in Retrieval Augmented Generation

EMNLP 2025

Retrieval-augmented generation (RAG) addresses the limitation of large language models (LLMs) in achieving up-to-date information by integrating external knowledge sources, but it is hindered by noisy or irrelevant retrieved data, leading to reduced accuracy. Additionally, most RAG methods rely on t

Cited by 0SourcePDFScholar
2025

Virtual Nodes Can Help: Tackling Distribution Shifts in Federated Graph Learning

AAAI 2025technical

Federated Graph Learning (FGL) enables multiple clients to jointly train powerful graph learning models, e.g., Graph Neural Networks (GNNs), without sharing their local graph data for graph-related downstream tasks, such as graph property prediction. In the real world, however, the graph data can su…

2024

Efficient Prompt Optimization Through the Lens of Best Arm Identification

NeurIPS 2024poster

The remarkable instruction-following capability of large language models (LLMs) has sparked a growing interest in automatically finding good prompts, i.e., prompt optimization. Most existing works follow the scheme of selecting from a pre-generated pool of candidate prompts. However, these designs m…

Cited by 7SourcePDFScholar
2024

FastGAS: Fast Graph-based Annotation Selection for In-Context Learning

ACL 2024findings

In-context learning (ICL) empowers large language models (LLMs) to tackle new tasks by using a series of training instances as prompts. Since generating the prompts needs to sample from a vast pool of instances and annotate them (e.g., add labels in classification task), existing methods have propos…

Cited by 3SourcePDFScholar
2024

FedLoGe: Joint Local and Generic Federated Learning under Long-tailed Data

ICLR 2024poster

Federated Long-Tailed Learning (Fed-LT), a paradigm wherein data collected from decentralized local clients manifests a globally prevalent long-tailed distribution, has garnered considerable attention in recent times. In the context of Fed-LT, existing works have predominantly centered on addressing…

2024

High-Resolution Through-Wall Imaging Using Data Fusion and Reasoning

ICASSP 2024accepted

Through-wall radar has been very pertinent to a variety of civilian and military services because of its ability to detect and sense through the wall obstacles. However, to maintain the penetrating ability, most of the existing TWR systems work at L/S band with limited bandwidth and thus can only ge…

Cited by 0SourceScholar
2024

Invertible Mosaic Image Hiding Network for Very Large Capacity Image Steganography

ICASSP 2024accepted

The existing image steganography methods either sequentially conceal secret images or conceal a concatenation of multiple images. In such ways, the interference of information among multiple images will become increasingly severe when the number of secret images becomes larger, thus restrict the dev…

Cited by 0SourceScholar
2024

Mixture of Demonstrations for In-Context Learning

NeurIPS 2024poster

In-Context Learning (ICL) empowers Large Language Models (LLMs) to tackle various tasks by providing input-output examples as additional inputs, referred to as demonstrations. Nevertheless, the performance of ICL could be easily impacted by the quality of selected demonstrations. Existing efforts ge…

Cited by 4SourcePDFScholar
2024

Rolling-Unet: Revitalizing MLP’s Ability to Efficiently Extract Long-Distance Dependencies for Medical Image Segmentation

AAAI 2024technical

Medical image segmentation methods based on deep learning network are mainly divided into CNN and Transformer. However, CNN struggles to capture long-distance dependencies, while Transformer suffers from high computational complexity and poor local feature learning. To efficiently extract and fuse l…

Cited by 30SourcePDFScholar
2023

Fed-GraB: Federated Long-tailed Learning with Self-Adjusting Gradient Balancer

NeurIPS 2023poster

Data privacy and long-tailed distribution are the norms rather than the exception in many real-world tasks. This paper investigates a federated long-tailed learning (Fed-LT) task in which each client holds a locally heterogeneous dataset; if the datasets can be globally aggregated, they jointly exhi…

2023

Imperceptible Adversarial Attack via Invertible Neural Networks

AAAI 2023technical

Adding perturbations via utilizing auxiliary gradient information or discarding existing details of the benign images are two common approaches for generating adversarial examples. Though visual imperceptibility is the desired property of adversarial examples, conventional adversarial attacks still…

2023

Personalizing Federated Learning with Over-The-Air Computations

ICASSP 2023accepted

Federated edge learning is a promising technology to deploy intelligence at the edge of wireless networks in a privacy-preserving manner. Under such a setting, multiple clients collaboratively train a global generic model under the coordination of an edge server. But the training efficiency is often…

Cited by 13SourceScholar
2023

Spectral Co-Distillation for Personalized Federated Learning

NeurIPS 2023poster

Personalized federated learning (PFL) has been widely investigated to address the challenge of data heterogeneity, especially when a single generic model is inadequate in satisfying the diverse performance requirements of local clients simultaneously. Existing PFL methods are inherently based on the…

2022

FedCorr: Multi-Stage Federated Learning for Label Noise Correction

CVPR 2022poster

Federated learning (FL) is a privacy-preserving distributed learning paradigm that enables clients to jointly train a global model. In real-world FL implementations, client data could have label noise, and different clients could have vastly different label noise levels. Although there exist methods…

Cited by 116PDFcodeScholar
2018

FPGA-Based Velocity Estimation for Control of Robots with Low-Resolution Encoders

IROS 2018poster

Robot control algorithms often rely on measurements of robot joint velocities, which can be estimated by measuring the time between encoder edges. When encoder edges occur infrequently, such as at low velocities and/or with low resolution encoders, this measurement delay may affect the stability of…

Cited by 19SourceScholar
2017

Augmented virtuality for model-based teleoperation

IROS 2017poster

Ground-based teleoperation of robots in space is subject to time delays of several seconds or more. This leads to the use of model-based approaches, where the operator interacts with a model (simulation) of the remote environment and the remote robot attempts to reproduce the results of that interac…

Cited by 29SourceScholar
2016

Virtual fixture assistance for needle passing and knot tying

IROS 2016poster

Suturing is a challenging and highly dexterous task in minimally invasive surgery, even with the assistance of robotic surgical systems. In this work, we propose a simple yet versatile impedance virtual fixture framework, which can be applied on the master manipulator in a tele-operated robotic surg…

Cited by 46SourceScholar
2015

Preliminary study of virtual nonholonomic constraints for time-delayed teleoperation

IROS 2015poster

Direct teleoperation with multisecond time-delayed telemetry between master and slave is challenging for humans to perform. When controlling a holonomic robot with many degrees of freedom, operators may incidentally provide commands in an intended direction without realizing their mistake until rece…

Cited by 20SourceScholar