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What is the effect of an inadmissible heuristic on A star?

  • A.The heuristic is ignored and only the path cost is used
  • B.Optimality is lost though a solution may still be found quickly
  • C.The search becomes incomplete and may never terminate
  • D.The algorithm reverts to uniform cost search behaviour

Answer: B

Overestimating may cause the algorithm to overlook the cheapest route, so the solution returned can be worse than optimal, but the search usually finishes sooner. Weighted A star exploits that deliberately with a bounded loss. Completeness is retained in a finite space, and the heuristic is certainly still used. Knowing exactly which guarantee a violated condition costs, rather than assuming everything fails, is what allows the violation to be adopted deliberately.

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