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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Admissible heuristic ： ウィキペディア英語版 Admissible heuristic In computer science, specifically in algorithms related to pathfinding, a heuristic function is said to be admissible if it never overestimates the cost of reaching the goal, i.e. the cost it estimates to reach the goal is not higher than the lowest possible cost from the current point in the path. == Search algorithms == An admissible heuristic is used to estimate the cost of reaching the goal state in an informed search algorithm. In order for a heuristic to be admissible to the search problem, the estimated cost must always be lower than or equal to the actual cost of reaching the goal state. The search algorithm uses the admissible heuristic to find an estimated optimal path to the goal state from the current node. For example, in A * search the evaluation function (where $n$ is the current node) is: $f(n)\; =\; g(n)\; +\; h(n)$ where :$f(n)$ = the evaluation function. :$g(n)$ = the cost from the start node to the current node :$h(n)$ = estimated cost from current node to goal. $h(n)$ is calculated using the heuristic function. With a non-admissible heuristic, the A * algorithm could overlook the optimal solution to a search problem due to an overestimation in $f(n)$. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Admissible heuristic」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.