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Pei Chen

25 accepted papers

2026

Circular-DPO: Aligning Multi-Stage 3D Generative Models via Preference Feedback Loop

CVPR 2026

Multi-stage generative models have shown great promise in 3D content creation due to focused generation of structure or texture in different stages, but their outputs often fail to align with human preferences. The key bottleneck to apply alignment methods is the presence of non-differentiable opera

Cited by 0SourceScholar
2026

Diffusion Distillation with Direct Preference Optimization for Efficient 3D LiDAR Scene Completion

AAAI 2026technical

The slow sampling speed of diffusion models hinders their application in 3D LiDAR scene completion. To address this, we propose Distillation-DPO, a novel framework that accelerates sampling through score distillation while simultaneously enhancing generation quality via preference alignment. Disti

Cited by 0SourcePDFScholar
2026

IVQ: Structured and Lightweight Vector Quantization via Binary Hierarchical Composition Inspired by $\textit{IChing}$

ICML 2026poster

Vector Quantization (VQ) has been widely used in visual and audio representation due to its effectiveness in compressing high-dimensional signals. However, existing VQ methods often rely on large and unstructured codebooks, which leads to inefficient code utilization and frequent codebook collapse. …

Cited by 0SourceScholar
2026

PRISON: Unmasking the Criminal Potential of Large Language Models

ICLR 2026poster

As large language models (LLMs) advance, concerns about their misconduct in complex social contexts intensify. Existing research has overlooked the systematic assessment of LLMs’ criminal potential in realistic interactions, where criminal potential is defined as the risk of producing harmful behavi…

Cited by 0SourceScholar
2026

When Diffusion Language Models Hesitate: Detecting and Correcting Visual Hallucinations via Confidence Fluctuation

ICML 2026poster

Multi-modal Diffusion Language Models (MDLMs) have emerged as a powerful alternative to autoregressive models in vision-language understanding, offering advantages in bidirectional context modeling and parallel decoding. However, existing MDLMs suffer from severe visual hallucinations due to the sta…

Cited by 0SourceScholar
2025

ALERT: An LLM-powered Benchmark for Automatic Evaluation of Recommendation Explanations

NAACL 2025long

Recommendation explanation systems have become increasingly vital with the widespread adoption of recommender systems. However, existing recommendation explanation evaluation benchmarks suffer from limited item diversity, impractical user profiling requirements, and unreliable and unscalable evaluat…

2025

Aligning Large Language Models with Implicit Preferences from User-Generated Content

ACL 2025long

Learning from preference feedback is essential for aligning large language models (LLMs) with human values and improving the quality of generated responses. However, existing preference learning methods rely heavily on curated data from humans or advanced LLMs, which is costly and difficult to scale…

2025

GVMGen: A General Video-to-Music Generation Model with Hierarchical Attentions

AAAI 2025technical

Composing music for video is essential yet challenging, leading to a growing interest in automating music generation for video applications. Existing approaches often struggle to achieve robust music-video correspondence and generative diversity, primarily due to inadequate feature alignment methods…

Cited by 3SourcePDFScholar
2025

Hephaestus: Improving Fundamental Agent Capabilities of Large Language Models through Continual Pre-Training

NAACL 2025long

Due to the scarcity of agent-oriented pre-training data, LLM-based autonomous agents typically rely on complex prompting or extensive fine-tuning, which often fails to introduce new capabilities while preserving strong generalizability. We introduce Hephaestus-Forge, the first large-scale pre-traini…

Cited by 1SourcePDFScholar
2025

Improving Adversarial Transferability through Channel-wise Scaling and Frequency-random Dropping

ICASSP 2025accepted

For black-box attacks, most existing attack methods exhibit weak transferability due to the significant discrepancy between substitute model and victim model. We argue that the model-specific discriminative regions are a key factor causing overfitting to the source model. However, existing model aug…

Cited by 0SourceScholar
2025

Improving Large Language Models Function Calling and Interpretability via Guided-Structured Templates

EMNLP 2025

Large language models (LLMs) have demonstrated strong reasoning and tool-use capabilities, yet they often fail in real-world tool-interactions due to incorrect parameterization, poor tool selection, or misinterpretation of user intent. These issues often stem from an incomplete understanding of user

2025

LongLeader: A Comprehensive Leaderboard for Large Language Models in Long-context Scenarios

NAACL 2025long

Large Language Models (LLMs), exemplified by Claude and LLama, have exhibited impressive proficiency in tackling a myriad of Natural Language Processing (NLP) tasks. Yet, in pursuit of the ambitious goal of attaining Artificial General Intelligence (AGI), there remains ample room for enhancing LLM c…

Cited by 0SourcePDFScholar
2025

Mosaic-IT: Cost-Free Compositional Data Synthesis for Instruction Tuning

ACL 2025finding

Finetuning large language models with a variety of instruction-response pairs has enhanced their capability to understand and follow instructions. Current instruction tuning primarily relies on teacher models or human intervention to generate and refine the instructions and responses for training, w…

2025

Personalized Dynamic Music Emotion Recognition with Dual-Scale Attention-Based Meta-Learning

AAAI 2025technical

Dynamic Music Emotion Recognition (DMER) aims to predict the emotion of different moments in music, playing a crucial role in music information retrieval. The existing DMER methods struggle to capture long-term dependencies when dealing with sequence data, which limits their performance. Furthermore…

2025

UniConv: Unifying Retrieval and Response Generation for Large Language Models in Conversations

ACL 2025long

The rapid advancement of conversational search systems revolutionizes how information is accessed by enabling the multi-turn interaction between the user and the system. Existing conversational search systems are usually built with two different models. This separation restricts the system from leve…

Cited by 0SourcePDFScholar
2024

CoMM: Collaborative Multi-Agent, Multi-Reasoning-Path Prompting for Complex Problem Solving

NAACL 2024findings

Large Language Models (LLMs) have shown great ability in solving traditional natural language tasks and elementary reasoning tasks with appropriate prompting techniques. However, their ability is still limited in solving complicated science problems. In this work, we aim to push the upper bound of t…

2024

ItD: Large Language Models Can Teach Themselves Induction through Deduction

ACL 2024long

Although Large Language Models (LLMs) are showing impressive performance on a wide range of Natural Language Processing tasks, researchers have found that they still have limited ability to conduct induction. Recent works mainly adopt “post processes” paradigms to improve the performance of LLMs on…

2023

HyTrel: Hypergraph-enhanced Tabular Data Representation Learning

NeurIPS 2023spotlight

Language models pretrained on large collections of tabular data have demonstrated their effectiveness in several downstream tasks. However, many of these models do not take into account the row/column permutation invariances, hierarchical structure, etc. that exist in tabular data. To alleviate thes…

2023

Learning Object Consistency and Interaction in Image Generation from Scene Graphs

IJCAI 2023poster

This paper is concerned with synthesizing images conditioned on a scene graph (SG), a set of object nodes and their edges of interactive relations. We divide existing works into image-oriented and code-oriented methods. In our analysis, the image-oriented methods do not consider object interaction i…

2022

Crossroads, Buildings and Neighborhoods: A Dataset for Fine-grained Location Recognition

NAACL 2022long

General domain Named Entity Recognition (NER) datasets like CoNLL-2003 mostly annotate coarse-grained location entities such as a country or a city. But many applications require identifying fine-grained locations from texts and mapping them precisely to geographic sites, e.g., a crossroad, an apart…

2022

DArch: Dental Arch Prior-Assisted 3D Tooth Instance Segmentation With Weak Annotations

CVPR 2022poster

Automatic tooth instance segmentation on 3D dental models is a fundamental task for computer-aided orthodontic treatments. Existing learning-based methods rely heavily on expensive point-wise annotations. To alleviate this problem, we are the first to explore a low-cost annotation way for 3D tooth i…

Cited by 37PDFScholar
2022

TO-Scene: A Large-Scale Dataset for Understanding 3D Tabletop Scenes

ECCV 2022poster

"Many basic indoor activities such as eating or writing are always conducted upon different tabletops (e.g., coffee tables, writing desks). It is indispensable to understanding tabletop scenes in 3D indoor scene parsing applications. Unfortunately, it is hard to meet this demand by directly deployin…

2021

Explicitly Capturing Relations between Entity Mentions via Graph Neural Networks for Domain-specific Named Entity Recognition

ACL 2021short

Named entity recognition (NER) is well studied for the general domain, and recent systems have achieved human-level performance for identifying common entity types. However, the NER performance is still moderate for specialized domains that tend to feature complicated contexts and jargonistic entity…