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Shao-Jin Ma

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Preprint Oct 2026

One Act, Many Masks: Effect-Marginal Policy Optimization for Long-Horizon Agents

This work proposes Effect-Marginal Policy Optimization (EMPO), which aligns policy optimization with execution-level equivalence through an effect-level surrogate that couples updates across alternative textual realizations, and shows that EMPO outperforms strong baselines in both task performance and learning efficien...

Shao-Jin Ma, Rui-Tao Wang, Peng-Yi Li et al. · 0 citations

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