December 2016
Intermediate to advanced
440 pages
9h 44m
Japanese
Content preview from アルゴリズムクイックリファレンス 第2版
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220
■
7
章
AI
における経路探索
何手で目標状態のあるべき場所に動かせるかを評価する。経路探索が難しいのは、
効果的なヒューリスティック関数の作成が難しいからだ。
7.7
深さ優先探索
深さ優先探索
は、できる限り前方へ進み、目標状態への経路を見つけようとする。
探索木によっては、盤面状態の数が大変多くなるので、
深さ優先探索
は、最大探索
深さが前もって定まっているような場合にのみ実用的となる。さらに、各状態を記
憶し、
1
回しか訪問しないことを保証することにより、ループを避けねばならない。
深さ優先探索
Depth-First Search
最良 平均 最悪
O(b*d ) O(b
d
)
search (initial, goal, maxDepth)
if initial = goal then return "Solution"
initial.depth = 0
open = new Stack
❶
深さ優先探索は、
Stack
を使って訪問するオープンな状態を貯える。
closed = new Set
insert (open, copy(initial))
while open
が空でない
do
n = pop (open)
❷
最も最近にスタックに積んだ状態をポップする。
insert (closed, n)
foreach n
における有効な手
m do
nextState = n
において
m
を指した状態
if closed
は
nextState
を含まない
then
nextState.depth ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.