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Ruijun Chen

9 accepted papers

2026

SPELL: Self-Play Reinforcement Learning for Evolving Long-Context Language Models

ICLR 2026poster

Progress in long-context reasoning for large language models (LLMs) has lagged behind other recent advances. This gap arises not only from the intrinsic difficulty of processing long texts, but also from the scarcity of reliable human annotations and programmatically verifiable reward signals. In th…

Cited by 0SourcecodeScholar
2026

Toward LoRA Copyright Protection with an Authorized Dual-Watermarking Framework

IJCAI 2026

Text-to-Image (T2I) diffusion models have been widely adopted due to their strong generative capabilities, while Low-Rank Adaptation (LoRA) has emerged as an efficient mechanism for customizing these models for diverse creative and commercial applications. This trend has fostered LoRA-centric servic

Cited by 0Scholar
2025

BlockPruner: Fine-grained Pruning for Large Language Models

ACL 2025finding

With the rapid growth in the size and complexity of large language models (LLMs), the costs associated with their training and inference have escalated significantly. Research indicates that certain layers in LLMs harbor substantial redundancy, and pruning these layers has minimal impact on the over…

2025

Discriminative Policy Optimization for Token-Level Reward Models

ICML 2025poster

Process reward models (PRMs) provide more nuanced supervision compared to outcome reward models (ORMs) for optimizing policy models, positioning them as a promising approach to enhancing the capabilities of LLMs in complex reasoning tasks. Recent efforts have advanced PRMs from step-level to token-l…

2025

ReAlign: Structured Revision for Small Language Model Alignment

EMNLP 2025

Aligning small language models with human preferences is challenging, as weak policies struggle to generate informative on-policy samples and suffer from unstable gradients when trained on off-policy signals from stronger models. In this work, we propose ReAlign, a training framework that combines t

2024

Self-Evolution Fine-Tuning for Policy Optimization

EMNLP 2024finding

The alignment of large language models (LLMs) is crucial not only for unlocking their potential in specific tasks but also for ensuring that responses meet human expectations and adhere to safety and ethical principles. To address the challenges of current alignment methodologies, we introduce self-…

2023

Learning to Memorize Entailment and Discourse Relations for Persona-Consistent Dialogues

AAAI 2023technical

Maintaining engagement and consistency is particularly important in dialogue systems. Existing works have improved the performance of dialogue systems by intentionally learning interlocutor personas with sophisticated network structures. One issue with this approach is that it requires more personal…