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What is a policy in agent terms?

  • A.A set of rules constraining what the agent is permitted to do
  • B.The plan the agent has committed to for the current episode
  • C.The performance measure the designer has specified for the task
  • D.A mapping from states to the actions the agent will take

Answer: D

A policy specifies an action for every state, so an agent following one need not plan afresh at each step. It is the standard object of reinforcement learning, where the goal is to find a policy maximising long term reward. Constraints, plans and performance measures are distinct concepts, though a plan is a sequence rather than a mapping. Distinguishing a policy from a plan matters because one is robust to unexpected states and the other is not.

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