LambdaPO: A Lambda Style Policy Optimization for Reasoning Language Models
Group Relative Policy Optimization(GRPO) has become a cornerstone of modern reinforcement learning alignment, prized for its efficacy in foregoing an explicit value-critic by leveraging reward normalization across sampled trajectory cohorts. However, the method's reliance on a monolithic statistical baseline, such as the group mean, collapses the relational topology of the trajectory space into a single scalar, thereby erasing the fine-grained preference information essential for navigating complex, rank-sensitive reward landscapes. To address this issue, we introduce a novel framework, Lambda Policy Optimization (LambdaPO), that addresses this information-theoretic bottleneck by re-conce...
| Authors | Redacted by arXiv |
|---|---|
| Primary category | cs.CL |
| Published | 19 May 2026 |
| Last updated at source | 22 May 2026 |
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