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Lei Xu

43 accepted papers

2026

AgentConductor: Topology Evolution for Multi-Agent Competition-Level Code Generation

ICML 2026poster

Large language model(LLM)-driven multi-agent systems(MAS) coordinate specialized agents through predefined interaction topologies and have shown promise for complex tasks such as competition-level code generation. Recent studies demonstrate that carefully designed multi-agent workflows and communica…

Cited by 0SourceScholar
2026

Beyond Ground-Truth: Leveraging Image Quality Priors for Real-World Image Restoration

CVPR 2026

Real-world image restoration aims to restore high-quality (HQ) images from degraded low-quality (LQ) inputs captured under uncontrolled conditions. Existing methods typically depend on ground-truth (GT) supervision, assuming that GT provides perfect reference quality. However, GT can still contain i

Cited by 4SourcecodeScholar
2026

DEPO: Dual-Efficiency Preference Optimization for LLM Agents

AAAI 2026technical

Recent advances in large language models (LLMs) have greatly improved their reasoning and decision-making abilities when deployed as agents. Richer reasoning, however, often comes at the cost of longer chain of thought (CoT), hampering interaction efficiency in real-world scenarios. Nevertheless, th

Cited by 0SourcePDFScholar
2026

Factored Causal Representation Learning for Robust Reward Modeling in RLHF

ICML 2026poster

A reliable reward model is essential for aligning large language models (LLMs) with human preferences through reinforcement learning from human feedback (RLHF). However, standard reward models are susceptible to spurious features that are not causally related to human labels. This can lead to *rewar…

Cited by 0SourceScholar
2026

MVRNet: A Multi-View Refinement Network for Accurate Recognition of Challenging Intracranial Aneurysms in Enhanced 3D CTA Images

IJCAI 2026

Intracranial aneurysms are life-threatening and require accurate, timely detection. Traditional manual diagnosis by radiologists can be subjective, leading to misdiagnoses, while existing deep learning approaches struggle with small aneurysms or cases complicated by surrounding tissues. In this pape

Cited by 0Scholar
2025

Beyond Surface Structure: A Causal Assessment of LLMs' Comprehension ability

ICLR 2025poster

Large language models (LLMs) have shown remarkable capability in natural language tasks, yet debate persists on whether they truly comprehend deep structure (i.e., core semantics) or merely rely on surface structure (e.g., presentation format). Prior studies observe that LLMs' performance declines w…

2025

Beyond correlation: The impact of human uncertainty in measuring the effectiveness of automatic evaluation and LLM-as-a-judge

ICLR 2025poster

The effectiveness of automatic evaluation of generative models is typically measured by comparing the labels generated via automation with human labels using correlation metrics. However, metrics like Krippendorff's $\alpha$ and Randolph's $\kappa$ were originally designed to measure the reliab…

2025

CAD-GPT: Synthesising CAD Construction Sequence with Spatial Reasoning-Enhanced Multimodal LLMs

AAAI 2025technical

Computer-aided design (CAD) significantly enhances the efficiency, accuracy, and innovation of design processes by enabling precise 2D and 3D modeling, extensive analysis, and optimization. Existing methods for creating CAD models rely on latent vectors or point clouds, which are difficult to obtain…

Cited by 1SourcePDFScholar
2025

CriSPO: Multi-Aspect Critique-Suggestion-guided Automatic Prompt Optimization for Text Generation

AAAI 2025technical

Existing automatic prompt engineering methods are typically designed for discriminative tasks, where new task prompts are iteratively refined with limited feedback from a single metric reflecting a single aspect. However, these approaches are suboptimal for generative tasks, which require more nuanc…

2025

Dual Data Alignment Makes AI-Generated Image Detector Easier Generalizable

NeurIPS 2025spotlight

The rapid increase in AI-generated images (AIGIs) underscores the need for detection methods. Existing detectors are often trained on biased datasets, leading to overfitting on spurious correlations between non-causal image attributes and real/synthetic labels. While these biased features enhance p…

Cited by 0SourcecodeScholar
2025

Personalized Label Inference Attack in Federated Transfer Learning via Contrastive Meta Learning

AAAI 2025technical

Federated Transfer Learning (FTL) is a popular approach to solve the problem of heterogeneous feature space and label distribution. Among the mainstream strategies for FTL, parameter decoupling, which balance the impact of a single global model and multiple personalized models under data heterogenei…

Cited by 0SourcePDFScholar
2025

Prior-Guided Flow Matching for Target-Aware Molecule Design with Learnable Atom Number

NeurIPS 2025poster

Structure-based drug design (SBDD), aiming to generate 3D molecules with high binding affinity toward target proteins, is a vital approach in novel drug discovery. Although recent generative models have shown great potential, they suffer from unstable probability dynamics and mismatch between genera…

Cited by 0SourceScholar
2025

Towards Generalizable Reinforcement Learning via Causality-Guided Self-Adaptive Representations

ICLR 2025poster

General intelligence requires quick adaptation across tasks. While existing reinforcement learning (RL) methods have made progress in generalization, they typically assume only distribution changes between source and target domains. In this paper, we explore a wider range of scenarios where not only…

Cited by 1SourcePDFScholar
2024

Boosting Efficiency in Task-Agnostic Exploration through Causal Knowledge

IJCAI 2024poster

The effectiveness of model training heavily relies on the quality of available training resources. However, budget constraints often impose limitations on data collection efforts. To tackle this challenge, we introduce causal exploration in this paper, a strategy that leverages the underlying causal…

2024

ConSiDERS-The-Human Evaluation Framework: Rethinking Human Evaluation for Generative Large Language Models

ACL 2024long

In this position paper, we argue that human evaluation of generative large language models (LLMs) should be a multidisciplinary undertaking that draws upon the insights from disciplines such as user experience research and human behavioral psychology to ensure that the experimental design and result…

Cited by 20SourcePDFScholar
2024

Light-Driven Micro/Nanorobot for Biomimetic Optical Communication

RA-L 2024

Light sensing and communication represent a vital link in the progress of biological evolution, helping organisms to respond to their environment and carry out survival activities. To simulate this process and exploit it in engineering applications, we develop a light-driven micro/nanorobotic system

Cited by 12SourceScholar
2024

Multilevel Attention Network with Semi-supervised Domain Adaptation for Drug-Target Prediction

AAAI 2024technical

Prediction of drug-target interactions (DTIs) is a crucial step in drug discovery, and deep learning methods have shown great promise on various DTI datasets. However, existing approaches still face several challenges, including limited labeled data, hidden bias issue, and a lack of generalization a…

2024

Salient Information Prompting to Steer Content in Prompt-based Abstractive Summarization

EMNLP 2024industry

Large language models (LLMs) can generate fluent summaries across domains using prompting techniques, reducing the effort required for summarization applications. However, crafting effective prompts that guide LLMs to generate summaries with the appropriate level of detail and writing style remains…

2024

Self-Supervised Learning for Enhancing Spatial Awareness in Free-Hand Sketches

IJCAI 2024poster

Free-hand sketch, as a versatile medium of communication, can be viewed as a collection of strokes arranged in a spatial layout to convey a concept. Due to the abstract nature of the sketches, changes in stroke position may make them difficult to recognize. Recently, Graphic sketch representations a…

2023

A Deep Temporal Factor Analysis Method for Large Scale Financial Portfolio Selection

ICASSP 2023accepted

Existing machine learning methods are effective in portfolio optimization on a small pool of assets. This is still not optimal because a larger number of assets in markets offers more opportunities for investors. However, existing methods are usually not scalable to large amount of assets which brin…

Cited by 0SourceScholar
2023

EPLF-VINS: Real-Time Monocular Visual-Inertial SLAM With Efficient Point-Line Flow Features

RA-L 2023

This letter introduces an efficient visual-inertial simultaneous localization and mapping (SLAM) method using point and line features. Currently, point-based SLAM methods do not perform well in scenarios such as weak textures and motion blur. Many researchers have noticed the excellent properties of

Cited by 58SourceScholar
2023

Efficient Top-K Feature Selection Using Coordinate Descent Method

AAAI 2023technical

Sparse learning based feature selection has been widely investigated in recent years. In this study, we focus on the l2,0-norm based feature selection, which is effective for exact top-k feature selection but challenging to optimize. To solve the general l2,0-norm constrained problems, we novelly de…

2023

GLPocket: A Multi-Scale Representation Learning Approach for Protein Binding Site Prediction

IJCAI 2023poster

Protein binding site prediction is an important prerequisite for the discovery of new drugs. Usually, natural 3D U-Net is adopted as the standard site prediction framework to do per-voxel binary mask classification. However, this scheme only performs feature extraction for single-scale samples, whic…

2023

Joint Feature and Differentiable $ k $-NN Graph Learning using Dirichlet Energy

NeurIPS 2023poster

Feature selection (FS) plays an important role in machine learning, which extracts important features and accelerates the learning process. In this paper, we propose a deep FS method that simultaneously conducts feature selection and differentiable $ k $-NN graph learning based on the Dirichlet Ene…

Cited by 4SourcePDFScholar
2023

Linking Sketch Patches by Learning Synonymous Proximity for Graphic Sketch Representation

AAAI 2023technical

Graphic sketch representations are effective for representing sketches. Existing methods take the patches cropped from sketches as the graph nodes, and construct the edges based on sketch's drawing order or Euclidean distances on the canvas. However, the drawing order of a sketch may not be unique,…

2022

Exploring the Universal Vulnerability of Prompt-based Learning Paradigm

NAACL 2022findings

Prompt-based learning paradigm bridges the gap between pre-training and fine-tuning, and works effectively under the few-shot setting. However, we find that this learning paradigm inherits the vulnerability from the pre-training stage, where model predictions can be misled by inserting certain trigg…

2022

Local Differential Privacy Meets Computational Social Choice - Resilience under Voter Deletion

IJCAI 2022poster

The resilience of a voting system has been a central topic in computational social choice. Many voting rules, like plurality, are shown to be vulnerable as the attacker can target specific voters to manipulate the result. What if a local differential privacy (LDP) mechanism is adopted such that the…

2021

DeepTrader: A Deep Reinforcement Learning Approach for Risk-Return Balanced Portfolio Management with Market Conditions Embedding

AAAI 2021technical

Most existing reinforcement learning (RL)-based portfolio management models do not take into account the market conditions, which limits their performance in risk-return balancing. In this paper, we propose DeepTrader, a deep RL method to optimize the investment policy. In particular, to tackle the…

Cited by 115SourcePDFScholar
2020

Discrete Biorthogonal Wavelet Transform Based Convolutional Neural Network for Atrial Fibrillation Diagnosis from Electrocardiogram

IJCAI 2020poster

For the problem of early detection of atrial fibrillation (AF) from electrocardiogram (ECG), it is difficult to capture subject-invariant discriminative features from ECG signals, due to the high variation in ECG morphology across subjects and the noise in ECG. In this paper, we propose an Discrete…

Cited by 0SourcePDFScholar
2019

Modeling Tabular data using Conditional GAN

NeurIPS 2019poster

Modeling the probability distribution of rows in tabular data and generating realistic synthetic data is a non-trivial task. Tabular data usually contains a mix of discrete and continuous columns. Continuous columns may have multiple modes whereas discrete columns are sometimes imbalanced making the…