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Weihong Zhong

16 accepted papers

2026

Causal Tracing of Object Representations in Large Vision Language Models: Mechanistic Interpretability and Hallucination Mitigation

AAAI 2026technical

Despite the remarkable advancements of Large Vision-Language Models (LVLMs), the mechanistic interpretability remains underexplored. Existing analyses are insufficiently comprehensive and lack examination covering visual and textual tokens, model components, and the full range of layers. This limita

Cited by 0SourcePDFScholar
2026

Focus Like a Human: Efficient GUI Grounding via Coarse-to-Fine Visual Attention and Parallel Verification

IJCAI 2026

Building upon powerful Large Visual Language Models, recent GUI agents have revolutionized autonomous GUI interaction. Given the high information density and structural complexity of GUI layouts, a critical challenge lies in accurately identifying where to focus, i.e., precise GUI grounding. To ensu

Cited by 0Scholar
2026

PERSONA: Dynamic and Compositional Inference-Time Personality Control via Activation Vector Algebra

ICLR 2026poster

Current methods for personality control in Large Language Models rely on static prompting or expensive fine-tuning, failing to capture the dynamic and compositional nature of human traits. We introduce PERSONA, a training-free framework that achieves fine-tuning level performance through direct mani…

Cited by 0SourceScholar
2025

Alleviating Hallucinations from Knowledge Misalignment in Large Language Models via Selective Abstention Learning

ACL 2025long

Large language models (LLMs) are known to suffer from severe hallucination issues. One of the main causes lies in the knowledge misalignment between the pre-training stage and the supervised fine-tuning stage. The unfamiliar knowledge encountered during fine-tuning may encourage LLMs to generate fac…

2025

Cross-Lingual Text-Rich Visual Comprehension: An Information Theory Perspective

AAAI 2025technical

Recent Large Vision-Language Models (LVLMs) have shown promising reasoning capabilities on text-rich images from charts, tables, and documents. However, the abundant text within such images may increase the model's sensitivity to language. This raises the need to evaluate LVLM performance on cross-…

2025

Improving Contextual Faithfulness of Large Language Models via Retrieval Heads-Induced Optimization

ACL 2025long

Ensuring contextual faithfulness in retrieval-augmented large language models (LLMs) is crucial for building trustworthy information-seeking systems, particularly in long-form question-answering (LFQA) scenarios. In this work, we identify a salient correlation between LFQA faithfulness and retrieval…

2025

Length Controlled Generation for Black-box LLMs

ACL 2025long

Large language models (LLMs) have demonstrated impressive instruction following capabilities, while still struggling to accurately manage the length of the generated text, which is a fundamental requirement in many real-world applications. Existing length control methods involve fine-tuning the para…

2025

Unveiling Entity-Level Unlearning for Large Language Models: A Comprehensive Analysis

COLING 2025main

Large language model unlearning has garnered increasing attention due to its potential to address security and privacy concerns, leading to extensive research in the field. However, existing studies have predominantly focused on instance-level unlearning, specifically targeting the removal of predef…

Cited by 1SourcePDFScholar
2024

Advancing Large Language Model Attribution through Self-Improving

EMNLP 2024main

Teaching large language models (LLMs) to generate text with citations to evidence sources can mitigate hallucinations and enhance verifiability in information-seeking systems. However, improving this capability requires high-quality attribution data, which is costly and labor-intensive. Inspired by…

Cited by 6SourcePDFScholar
2024

Discrete Modeling via Boundary Conditional Diffusion Processes

NeurIPS 2024poster

We present an novel framework for efficiently and effectively extending the powerful continuous diffusion processes to discrete modeling. Previous approaches have suffered from the discrepancy between discrete data and continuous modeling. Our study reveals that the absence of guidance from discrete…

Cited by 0SourcePDFScholar
2024

Extending Context Window of Large Language Models from a Distributional Perspective

EMNLP 2024main

Scaling the rotary position embedding (RoPE) has become a common method for extending the context window of RoPE-based large language models (LLMs). However, existing scaling methods often rely on empirical approaches and lack a profound understanding of the internal distribution within RoPE, result…

2024

Investigating and Mitigating the Multimodal Hallucination Snowballing in Large Vision-Language Models

ACL 2024long

Though advanced in understanding visual information with human languages, Large Vision-Language Models (LVLMs) still suffer from multimodal hallucinations. A natural concern is that during multimodal interaction, the generated hallucinations could influence the LVLMs’ subsequent generation. Thus, we…

2024

Learning Fine-Grained Grounded Citations for Attributed Large Language Models

ACL 2024findings

Despite the impressive performance on information-seeking tasks, large language models (LLMs) still struggle with hallucinations. Attributed LLMs, which augment generated text with in-line citations, demonstrate potential in mitigating hallucinations and improving verifiability. However, current app…

2024

Length Extrapolation of Transformers: A Survey from the Perspective of Positional Encoding

EMNLP 2024finding

Built upon the Transformer, large language models (LLMs) have captured worldwide attention due to their remarkable abilities. Nevertheless, all Transformer-based models including LLMs suffer from a preset length limit and can hardly generalize from short training sequences to longer inference ones,…

Cited by 21SourcePDFScholar
2023

Controllable Text Generation via Probability Density Estimation in the Latent Space

ACL 2023long

Previous work on controllable text generation has explored the idea of control from the latent space, such as optimizing a representation with attribute-specific classifiers or sampling one from relevant discrete samples. However, they cannot effectively model a complex space with diverse attributes…

2023

STOA-VLP: Spatial-Temporal Modeling of Object and Action for Video-Language Pre-training

AAAI 2023technical

Although large-scale video-language pre-training models, which usually build a global alignment between the video and the text, have achieved remarkable progress on various downstream tasks, the idea of adopting fine-grained information during the pre-training stage is not well explored. In this wor…

Cited by 8SourcePDFScholar