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Zhi-Da Qin

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#machine learning Preprint Oct 2026

Revealing After Overwriting: An Exponential POMDP OPE Lower Bound under History-Dependent Logging

Multi-step revealing can make off-policy evaluation tractable under memoryless logging. With history-dependent logging, state decodability and target-relevant evidence can separate. For every horizon $H\ge3$, we construct two exactly realizable POMDPs with four actions, at most four states per layer, a known logger, an...

You-Yu Luo, Peng-Zhan Zhou, Zhi-Da Qin et al. · 0 citations

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