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Zhikai Lei

2 accepted papers

2026

Stabilizing Off-Policy Reinforcement Learning for LLMs via Balanced Policy Optimization with Adaptive Clipping

ICLR 2026poster

Reinforcement learning (RL) has recently become the core paradigm for aligning and strengthening large language models (LLMs). Yet, applying RL in off-policy settings—where stale data from past policies are used for training—improves sample efficiency, but remains challenging: policy entropy decline…

Cited by 0SourcecodeScholar
2025

Optimizing Question Semantic Space for Dynamic Retrieval-Augmented Multi-hop Question Answering

ACL 2025long

Retrieval-augmented generation (RAG) is usually integrated into large language models (LLMs) to mitigate hallucinations and knowledge obsolescence. Whereas, conventional one-step retrieve-and-read methods are insufficient for multi-hop question answering, facing challenges of retrieval semantic mism…

Cited by 0SourcePDFScholar