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Lichang Chen

22 accepted papers

2026

Learning to Reason via Mixture-of-Thought for Logical Reasoning

ICLR 2026poster

Human beings naturally utilize multiple reasoning modalities to learn and solve logical problems, i.e., different representational formats such as natural language, code, and symbolic logic. In contrast, most existing LLM-based approaches operate with a single reasoning modality during training, typ…

Cited by 0SourcecodeScholar
2026

MMAU-Pro: A Challenging and Comprehensive Benchmark for Holistic Evaluation of Audio General Intelligence

AAAI 2026technical

Audio comprehension—including speech, non-speech sounds, and music—is essential for achieving human-level intelligence. Consequently, AI agents must demonstrate holistic audio understanding to qualify as generally intelligent. However, evaluating auditory intelligence comprehensively remains challen

Cited by 0SourcePDFScholar
2025

Creativity or Brute Force? Using Brainteasers as a Window into the Problem-Solving Abilities of Large Language Models

NeurIPS 2025poster

Accuracy remains a standard metric for evaluating AI systems, but it offers limited insight into how models arrive at their solutions. In this work, we introduce a benchmark based on brainteasers written in long narrative form to probe more deeply into the types of reasoning strategies that models…

Cited by 0SourceScholar
2025

From Lists to Emojis: How Format Bias Affects Model Alignment

ACL 2025long

In this paper, we study format biases in reinforcement learning from human feedback (RLHF). We observe that many widely-used preference models—including human evaluators, GPT-4, and top-ranking models on the RewardBench benchmark—exhibit strong biases towards specific format patterns, such as lists,…

2025

OmnixR: Evaluating Omni-modality Language Models on Reasoning across Modalities

ICLR 2025poster

We introduce \textbf{OmnixR}, an evaluation suite designed to benchmark state-of-the-art Omni-modality Language Models (OLMs), such as GPT-4o and Gemini. Evaluating OLMs, which integrate multiple modalities such as text, vision, and audio, presents unique challenges. Particularly, the user message…

Cited by 5SourcePDFScholar
2025

RRM: Robust Reward Model Training Mitigates Reward Hacking

ICLR 2025poster

Reward models (RMs) play a pivotal role in aligning large language models (LLMs) with human preferences. However, traditional RM training, which relies on response pairs tied to specific prompts, struggles to disentangle prompt-driven preferences from prompt-independent artifacts, such as response l…

Cited by 0SourcePDFScholar
2025

Unveiling the Impact of Coding Data Instruction Fine-Tuning on Large Language Models Reasoning

AAAI 2025technical

Instruction Fine-Tuning (IFT) significantly enhances the zero-shot capabilities of pretrained Large Language Models (LLMs). While coding data is known to boost LLM reasoning abilities during pretraining, its role in activating internal reasoning capacities during IFT remains understudied. This paper…

2024

AlpaGasus: Training a Better Alpaca with Fewer Data

ICLR 2024poster

Large language models~(LLMs) strengthen instruction-following capability through instruction-finetuning (IFT) on supervised instruction/response data. However, widely used IFT datasets (e.g., Alpaca's 52k data) surprisingly contain many low-quality instances with incorrect or irrelevant responses, w…

2024

Backdooring Instruction-Tuned Large Language Models with Virtual Prompt Injection

NAACL 2024long

Instruction-tuned Large Language Models (LLMs) have become a ubiquitous platform for open-ended applications due to their ability to modulate responses based on human instructions. The widespread use of LLMs holds significant potential for shaping public perception, yet also risks being maliciously…

2024

Can LLMs Speak For Diverse People? Tuning LLMs via Debate to Generate Controllable Controversial Statements

ACL 2024findings

Making LLMs speak for different, especially minority groups of people, and generate statements supporting their diverse or even controversial perspectives is critical to creating an inclusive environment. However, existing LLMs lack sufficient controllability to the stance of their generated content…

2024

From Quantity to Quality: Boosting LLM Performance with Self-Guided Data Selection for Instruction Tuning

NAACL 2024long

In the realm of Large Language Models (LLMs), the balance between instruction data quality and quantity is a focal point. Recognizing this, we introduce a self-guided methodology for LLMs to autonomously discern and select cherry samples from open-source datasets, effectively minimizing manual curat…

2024

HallusionBench: An Advanced Diagnostic Suite for Entangled Language Hallucination and Visual Illusion in Large Vision-Language Models

CVPR 2024poster

We introduce "HallusionBench" a comprehensive benchmark designed for the evaluation of image-context reasoning. This benchmark presents significant challenges to advanced large visual-language models (LVLMs) such as GPT-4V(ision) Gemini Pro Vision Claude 3 and LLaVA-1.5 by emphasizing nuanced unders…

2024

InstructZero: Efficient Instruction Optimization for Black-Box Large Language Models

ICML 2024poster

Large language models (LLMs) are instruction followers but the performance varies under different instructions. It is challenging to create the best instruction, especially for black-box LLMs on which backpropagation is forbidden. Instead of directly optimizing the discrete instruction, we optimize…

2024

ODIN: Disentangled Reward Mitigates Hacking in RLHF

ICML 2024poster

In this work, we study the issue of reward hacking on the response length, a challenge emerging in Reinforcement Learning from Human Feedback (RLHF) on LLMs. A well-formatted, verbose but less helpful response from the LLMs can often deceive LLMs or even human evaluators and achieve high scores. The…

Cited by 57SourcePDFScholar
2024

Prompting Language-Informed Distribution for Compositional Zero-Shot Learning

ECCV 2024poster

"Compositional zero-shot learning (CZSL) task aims to recognize unseen compositional visual concepts, , sliced tomatoes, where the model is learned only from the seen compositions, , sliced potatoes and red tomatoes. Thanks to the prompt tuning on large pre-trained visual language models such as CLI…

2024

Selective Reflection-Tuning: Student-Selected Data Recycling for LLM Instruction-Tuning

ACL 2024findings

Instruction tuning is critical to large language models (LLMs) for achieving better instruction following and task adaptation capabilities but its success heavily relies on the training data quality. Many recent methods focus on improving the data quality but often overlook the compatibility of the…

2024

Spectrum AUC Difference (SAUCD): Human-aligned 3D Shape Evaluation

CVPR 2024poster

Existing 3D mesh shape evaluation metrics mainly focus on the overall shape but are usually less sensitive to local details. This makes them inconsistent with human evaluation as human perception cares about both overall and detailed shape. In this paper we propose an analytic metric named Spectrum…

Cited by 7SourcePDFScholar
2024

Unbiased Watermark for Large Language Models

ICLR 2024spotlight

The recent advancements in large language models (LLMs) have sparked a growing apprehension regarding the potential misuse. One approach to mitigating this risk is to incorporate watermarking techniques into LLMs, allowing for the tracking and attribution of model outputs. This study examines a cruc…

Cited by 129SourcePDFScholar
2024

Your Vision-Language Model Itself Is a Strong Filter: Towards High-Quality Instruction Tuning with Data Selection

ACL 2024findings

Data selection in instruction tuning emerges as a pivotal process for acquiring high-quality data and training instruction-following large language models (LLMs), but it is still a new and unexplored research area for vision-language models (VLMs). Existing data selection approaches on LLMs either r…

2023

PTP: Boosting Stability and Performance of Prompt Tuning with Perturbation-Based Regularizer

EMNLP 2023long main

Recent studies show that prompt tuning can better leverage the power of large language models than fine-tuning on downstream natural language understanding tasks. However, the existing prompt tuning methods have training instability issues, as the variance of scores under different random seeds is q…

Cited by 0SourceScholar