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Feiteng Fang

10 accepted papers

2025

COIG-CQIA: Quality is All You Need for Chinese Instruction Fine-tuning

NAACL 2025findings

Remarkable progress on large language models (LLMs), particularly in English, has facilitated impressive capabilities in following human instructions. However, there remains a noticeable gap in instruction fine-tuning for Chinese, where the complex linguistic features pose significant challenges. Ex…

2025

CPO: Addressing Reward Ambiguity in Role-playing Dialogue via Comparative Policy Optimization

EMNLP 2025

Reinforcement Learning Fine-Tuning (RLFT) has achieved notable success in tasks with objectively verifiable answers (e.g., code generation, mathematical reasoning), yet struggles with open-ended subjective tasks like role-playing dialogue. Traditional reward modeling approaches, which rely on indepe

2025

Can MLLMs Understand the Deep Implication Behind Chinese Images?

ACL 2025long

As the capabilities of Multimodal Large Language Models (MLLMs) improve, the need for higher-order evaluation of them is increasing. However, there is a lack of work evaluating MLLM for higher-order perception and understanding of Chinese visual content. To address this, we introduce the CII-Bench,…

2025

Expanding before Inferring: Enhancing Factuality in Large Language Models through Premature Layers Interpolation

EMNLP 2025

Large Language Models (LLMs) demonstrate remarkable capabilities in text understanding and generation. However, their tendency to produce factually inconsistent outputs—commonly referred to as “hallucinations”—remains a critical challenge. Existing approaches, such as retrieval-based and inference-t

2025

LIME: Less Is More for MLLM Evaluation

ACL 2025finding

Multimodal Large Language Models (MLLMs) are measured on numerous benchmarks like image captioning, visual question answer, and reasoning. However, these benchmarks often include overly simple or uninformative samples, making it difficult to effectively distinguish the performance of different MLLMs…

2025

OmniCharacter: Towards Immersive Role-Playing Agents with Seamless Speech-Language Personality Interaction

ACL 2025long

Role-Playing Agents (RPAs), benefiting from large language models, is an emerging interactive AI system that simulates roles or characters with diverse personalities. However, existing methods primarily focus on mimicking dialogues among roles in textual form, neglecting the role’s voice traits (e.g…

2025

Reverse Preference Optimization for Complex Instruction Following

ACL 2025finding

Instruction following (IF) is a critical capability for large language models (LLMs). However, handling complex instructions with multiple constraints remains challenging. Previous methods typically select preference pairs based on the number of constraints they satisfy, introducing noise where chos…

2024

CLHA: A Simple Yet Effective Contrastive Learning Framework for Human Alignment

COLING 2024main

Reinforcement learning from human feedback (RLHF) is a crucial technique in aligning large language models (LLMs) with human preferences, ensuring these LLMs behave in beneficial and comprehensible ways to users. However, a longstanding challenge in human alignment techniques based on reinforcement…

2024

Enhancing Noise Robustness of Retrieval-Augmented Language Models with Adaptive Adversarial Training

ACL 2024long

Large Language Models (LLMs) exhibit substantial capabilities yet encounter challenges including hallucination, outdated knowledge, and untraceable reasoning processes. Retrieval-augmented generation (RAG) has emerged as a promising solution, integrating knowledge from external databases to mitigate…

2024

II-Bench: An Image Implication Understanding Benchmark for Multimodal Large Language Models

NeurIPS 2024poster

The rapid advancements in the development of multimodal large language models (MLLMs) have consistently led to new breakthroughs on various benchmarks. In response, numerous challenging and comprehensive benchmarks have been proposed to more accurately assess the capabilities of MLLMs. However, ther…

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