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How is a state represented in classical planning?

  • A.As a set of ground atoms taken to be true
  • B.As a single indivisible token identifying the configuration
  • C.As a probability distribution over possible configurations
  • D.As a sequence of the actions performed so far in the plan

Answer: A

A state is a set of fluents, and everything not listed is false by the closed world assumption, which is a factored representation and is exactly what lets a planner reason about actions without enumerating states. Atomic tokens would hide the structure, distributions belong to probabilistic planning and action sequences are plans rather than states. Choosing a representation in which an action's effect can be described locally is what makes planning different from ordinary search.

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