What Must a World Model Distinguish for Planning?
World models simulate the consequences of action candidates, but good planning need not preserve every physical distinction required for accurate prediction. We formalize this gap through a hierarchy of mechanism, response, and decision sufficiency. Given a candidate set, the planning query determines which physical va...
Rong-Zhe Wei, Hans Hao-Hsun Hsu, Pei-Zhi Niu et al.
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