翻訳と辞書 Words near each other ・ Information society ・ Information Society (album) ・ Information Society (band) ・ Information society (disambiguation) ・ Information Society discography ・ Information Society Project ・ Information source ・ Information source (mathematics) ・ Information Sources in Law ・ Information space ・ Information space analysis ・ Information strategist ・ Information structure ・ Information subsidy ・ Information gain in decision trees ・ Information gain ratio ・ Information gap ・ Information gap task ・ Information Gateway Services ・ Information Gathering Satellite ・ Information geometry ・ Information Global Service ・ Information good ・ Information governance ・ Information grazing ・ Information Harvesting ・ Information held under Section 142 of the Education Act 2002 ・ Information hiding ・ Information history ・ Information Holdings Inc. Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Information gain ratio ： ウィキペディア英語版 Information gain ratio In decision tree learning, Information gain ratio is a ratio of information gain to the intrinsic information. It is used to reduce a bias towards multi-valued attributes by taking the number and size of branches into account when choosing an attribute.〔http://www.ke.tu-darmstadt.de/lehre/archiv/ws0809/mldm/dt.pdf〕 == Information Gain Calculation == Let $Attr$ be the set of all attributes and $Ex$ the set of all training examples, $value(x,a)$ with $x\backslash in\; Ex$ defines the value of a specific example $x$ for attribute $a\backslash in\; Attr$, $H$ specifies the entropy. The $values(a)$ function denotes set of all possible values of attribute $a\; \backslash in\; Attr$. The information gain for an attribute $a\backslash in\; Attr$ is defined as follows: $IG(Ex,a)=H(Ex)\; -\backslash sum\_\; \backslash left(\backslash frac\; \backslash cdot\; H(\backslash )\backslash right)$ The information gain is equal to the total entropy for an attribute if for each of the attribute values a unique classification can be made for the result attribute. In this case the relative entropies subtracted from the total entropy are 0. 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「Information gain ratio」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.