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Hou Pong Chan

20 accepted papers

2025

Analyzing LLMs’ Knowledge Boundary Cognition Across Languages Through the Lens of Internal Representations

ACL 2025long

While understanding the knowledge boundaries of LLMs is crucial to prevent hallucination, research on the knowledge boundaries of LLMs has predominantly focused on English. In this work, we present the first study to analyze how LLMs recognize knowledge boundaries across different languages by probi…

2025

Debate-to-Write: A Persona-Driven Multi-Agent Framework for Diverse Argument Generation

COLING 2025main

Writing arguments is a challenging task for both humans and machines. It entails incorporating high-level beliefs from various perspectives on the topic, along with deliberate reasoning and planning to construct a coherent narrative. Current language models often generate outputs autoregressively, l…

2025

FineReason: Evaluating and Improving LLMs’ Deliberate Reasoning through Reflective Puzzle Solving

ACL 2025long

Many challenging reasoning tasks require not just rapid, intuitive responses, but a more deliberate, multi-step approach. Recent progress in large language models (LLMs) highlights an important shift from the “System 1” way of quick reactions to the “System 2” style of reflection-and-correction prob…

2025

GeoPQA: Bridging the Visual Perception Gap in MLLMs for Geometric Reasoning

EMNLP 2025

Recent advancements in reinforcement learning (RL) have enhanced the reasoning abilities of large language models (LLMs), yet the impact on multimodal LLMs (MLLMs) is limited. Particularly in vision-intensive tasks like geometric reasoning, MLLMs hallucinate frequently, leading to inaccurate reasoni

2025

M-LongDoc: A Benchmark For Multimodal Super-Long Document Understanding And A Retrieval-Aware Tuning Framework

EMNLP 2025

The ability to understand and answer questions over documents can be useful in many business and practical applications. However, documents often contain lengthy and diverse multimodal contents such as texts, figures, and tables, which are very time-consuming for humans to read thoroughly. Hence, th

Cited by 0SourcePDFScholar
2025

ManiTweet: A New Benchmark for Identifying Manipulation of News on Social Media

COLING 2025main

Considerable advancements have been made to tackle the misrepresentation of information derived from reference articles in the domains of fact-checking and faithful summarization. However, an unaddressed aspect remains - the identification of social media posts that manipulate information within ass…

2025

Persona-DB: Efficient Large Language Model Personalization for Response Prediction with Collaborative Data Refinement

COLING 2025main

The increasing demand for personalized interactions with large language models (LLMs) calls for methodologies capable of accurately and efficiently identifying user opinions and preferences. Retrieval augmentation emerges as an effective strategy, as it can accommodate a vast number of users without…

Cited by 17SourcePDFScholar
2025

Praxis-VLM: Vision-Grounded Decision Making via Text-Driven Reinforcement Learning

NeurIPS 2025poster

Vision Language Models exhibit impressive performance for various tasks, yet they often lack the sophisticated situational reasoning required for complex decision-making. This paper shows that VLMs can achieve surprisingly strong decision-making performance when visual scenes are replaced by textual…

Cited by 0SourceScholar
2025

Scaling Language-centric Omnimodal Representation Learning

NeurIPS 2025poster

Recent multimodal embedding approaches leveraging multimodal large language models (MLLMs) fine-tuned with contrastive learning (CL) have shown promising results, yet the underlying reasons behind their superiority remain underexplored. This work argues that a crucial advantage of MLLM-based approac…

Cited by 0SourcecodeScholar
2025

SeaLLMs 3: Open Foundation and Chat Multilingual Large Language Models for Southeast Asian Languages

NAACL 2025system demonstrations

Large Language Models (LLMs) have shown remarkable abilities across various tasks, yet their development has predominantly centered on high-resource languages like English and Chinese, leaving low-resource languages underserved. To address this disparity, we present SeaLLMs 3, the latest iteration o…

2024

Do LVLMs Understand Charts? Analyzing and Correcting Factual Errors in Chart Captioning

ACL 2024findings

Advances in large vision-language models (LVLMs) have led to significant progress in generating natural language descriptions for visual contents. These powerful models are known for producing texts that are factually inconsistent with the visual input. While some efforts mitigate such inconsistenci…

2023

Decoding the Silent Majority: Inducing Belief Augmented Social Graph with Large Language Model for Response Forecasting

EMNLP 2023long main

Automatic response forecasting for news media plays a crucial role in enabling content producers to efficiently predict the impact of news releases and prevent unexpected negative outcomes such as social conflict and moral injury. To effectively forecast responses, it is essential to develop measure…

Cited by 0SourcecodeScholar
2023

Interpretable Automatic Fine-grained Inconsistency Detection in Text Summarization

ACL 2023findings

Existing factual consistency evaluation approaches for text summarization provide binary predictions and limited insights into the weakness of summarization systems. Therefore, we propose the task of fine-grained inconsistency detection, the goal of which is to predict the fine-grained types of fact…

2023

Measuring the Effect of Influential Messages on Varying Personas

ACL 2023short

Predicting how a user responds to news events enables important applications such as allowing intelligent agents or content producers to estimate the effect on different communities and revise unreleased messages to prevent unexpected bad outcomes such as social conflict and moral injury. We present…

2023

Multimedia Generative Script Learning for Task Planning

ACL 2023findings

Goal-oriented generative script learning aims to generate subsequent steps to reach a particular goal, which is an essential task to assist robots or humans in performing stereotypical activities. An important aspect of this process is the ability to capture historical states visually, which provide…

2023

SumREN: Summarizing Reported Speech about Events in News

AAAI 2023technical

A primary objective of news articles is to establish the factual record for an event, frequently achieved by conveying both the details of the specified event (i.e., the 5 Ws; Who, What, Where, When and Why regarding the event) and how people reacted to it (i.e., reported statements). However, exist…

2022

Grounding Commands for Autonomous Vehicles via Layer Fusion with Region-specific Dynamic Layer Attention

IROS 2022poster

Grounding a command to the visual environment is an essential ingredient for interactions between autonomous vehicles and humans. In this work, we study the problem of language grounding for autonomous vehicles, which aims to localize a region in a visual scene according to a natural language comman…

Cited by 6SourceScholar
2022

MOCHA: A Multi-Task Training Approach for Coherent Text Generation from Cognitive Perspective

EMNLP 2022main

Teaching neural models to generate narrative coherent texts is a critical problem. Recent pre-trained language models have achieved promising results, but there is still a gap between human written texts and machine-generated outputs. In this work, we propose a novel multi-task training strategy for…

2022

PLANET: Dynamic Content Planning in Autoregressive Transformers for Long-form Text Generation

ACL 2022long

Despite recent progress of pre-trained language models on generating fluent text, existing methods still suffer from incoherence problems in long-form text generation tasks that require proper content control and planning to form a coherent high-level logical flow. In this work, we propose PLANET, a…

Cited by 42SourcePDFScholar