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What is a plateau in a local search landscape?

  • A.A flat region where neighbouring states have equal value
  • B.A steep region where the value changes very rapidly
  • C.A region containing several local maxima close together
  • D.The boundary between two basins of attraction

Answer: A

On a plateau no neighbour is better and none is worse, so a strict hill climber halts while allowing sideways moves may let it cross to higher ground. The risk is an infinite sideways walk, so a limit on consecutive sideways moves is imposed. Steep regions, clustered maxima and basin boundaries are different features. A landscape whose flat regions are as troublesome as its peaks is a reminder that the difficulty lies in the shape of the space rather than in the algorithm.

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