WTF is a World Model? [D]
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“世界模型”的概念正在被讨论，特别是它与模拟的区别。尽管一些人认为当前的世界模型是先进的视频生成模型，但讨论也延伸到模拟器、物理引擎、硬件/视频游戏模拟器，甚至带有附加功能的数字孪生是否符合条件。一个关键问题是，世界模型仅仅是模拟的品牌重塑，还是存在根本区别，这可能将定义限制为旨在普遍模拟整个真实世界的模型，从而排除特定交互模型或视频游戏世界模型。
I'm trying to understand what a world model is. I understand it has cognitive science and reinforcement learning. I understand at least at the moment what most people are building which they call world models are fancy video generation models. But what actually counts. Does a simulator count as a world model. Some "world models" are described as simulators, or rather a simulator is described as one type of world model. But is a simulator like lets say a physics engine a world model? There are some video game world models or computer use world models. Would a hardware/video game emulator count as a world model? And can a digital twin also be a world model with some additional features.
I've seen a definition that says a world model should "operate on learned representations, not exclusively hand-crafted physics i.e. a physical referent is optional." Which is fair enough but then would a physics accelerator that uses a ml count as a world model? Like some ML fluid simulator is that a fluid world model?
Are world models just a rebrand of simulation or is there really a fundamental difference? Should the definition be limited to models that aim to generally model all of the real world? So that would exclude video game world models and also models of specific interactions.