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What distinguishes local search from the search methods discussed so far?

  • A.It keeps only the current state and does not record paths
  • B.It uses a heuristic rather than an exhaustive enumeration
  • C.It operates on graphs rather than on trees of states
  • D.It searches backwards from the goal rather than forwards

Answer: A

Local search moves from one complete state to a neighbour, keeping no path and no frontier, which suits problems where the goal state itself is the answer and the route to it is irrelevant. Timetabling and layout problems are typical. Memory is constant regardless of the space's size. Heuristics, graphs and direction are shared with other methods. Discarding the path when the path is not wanted is what buys the enormous memory saving.

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