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20201121 昔の論文を読む会 The PageRank Citation Ranking
1.
© 2020 Dahdit
K.K., All rights reserved. The PageRank Citation Ranking: Bringing Order to the Web November 2020 Yasunori Endo, Dahdit K.K. @yendo1115 2020/11/21 Rev.001
2.
© 2020 Dahdit
K.K., All rights reserved. 2
3.
© 2020 Dahdit
K.K., All rights reserved. 3 $ whoami
4.
© 2020 Dahdit
K.K., All rights reserved. 4 自己紹介 名前 遠藤 靖典 (えんどう やすのり) 生年月日 1991/11/15 (29) 所属・役職 ダーディット株式会社 代表取締役 株式会社IBUKI 兼務 北陸先端科学技術大学院大学 修士課程 → 放送大学に転学(予定)
5.
© 2020 Dahdit
K.K., All rights reserved. 5 キーコンセプト: 3本の柱 Neuroscience Aritificial Intelligence Low-Layer Technology 神経科学 • 脳に学び、脳を超えるコンピュータを目指して • 脳の “リバースエンジニアリング” と “再実装” 人工知能 • より便利でより役に立つシステムを目指して • 適切な技術を駆使し課題を解決 低レイヤー(*)・組込み技術 • 身近で役立つモノづくりを目指して • ハードウェアを知りつくし限界まで使い切る技術力 (*): 低レイヤーとは、「ハードウェアに近い」ということを意味します
6.
© 2020 Dahdit
K.K., All rights reserved. 6 弊社の注力3融合領域 Neuroscience Artificial Intelligence Low-Layer Technology Neurosci-Inspired AI 真のAIをつくりだす Edge-Computing AIを身近に、PoCのその先へ Neuromorphic Computing 真に脳を超えるコンピュータ それぞれの融合領域に 活路を見出していく
7.
© 2020 Dahdit
K.K., All rights reserved. 7 Interest of Research 神経科学をベースとした次世代人工知能を実現するために… • 脳の学習アルゴリズムを何とかして知りたかった • まずは測定から!脳波解析手法の研究 → 挫折 • ニューラルネットワークの学習の振る舞いから脳を類推したい ← New!!
8.
© 2020 Dahdit
K.K., All rights reserved. 8 About the Paper …
9.
© 2020 Dahdit
K.K., All rights reserved. 9
10.
© 2020 Dahdit
K.K., All rights reserved. 10
11.
© 2020 Dahdit
K.K., All rights reserved. 11
12.
© 2020 Dahdit
K.K., All rights reserved. 12 History of Google
13.
© 2020 Dahdit
K.K., All rights reserved. 13 What They Made? Search Engine!!
14.
© 2020 Dahdit
K.K., All rights reserved. 14 What Made Google Innovative? • 当時にも検索エンジンはいろいろあった 検索結果の重みづけが従来はうまくいっておらず 欲しい情報が見つけづらかった ↓ Invention of PageRank Algorithm!
15.
© 2020 Dahdit
K.K., All rights reserved. 15 About PageRank Algorithm
16.
© 2020 Dahdit
K.K., All rights reserved. 16 Intuitive Description of PageRank リンクの数に関する議論 • 一般論として、「たくさんリンクされているページ」と「あまりリンクされていないページ」がある • ex) Netscape は 62,804 個所からリンクされているなど • たくさんリンクされているページは、あまりリンクされていないページより「重要度」が高い リンクの質に関する議論 • 例えば Yahoo のホームページからリンクされているページがあったとしたら、たとえリンクが1本だとし ても「重要度」は高い
17.
© 2020 Dahdit
K.K., All rights reserved. 17 Intuitive Description of PageRank (Cont’d) 被リンクのランクの和が高ければ、そのページは高いランクとなる • 多くの被リンクがある • 高いランクの被リンクが少しある
18.
© 2020 Dahdit
K.K., All rights reserved. 18 Simplified PageRank Algorithm
19.
© 2020 Dahdit
K.K., All rights reserved. 19 Simplified PageRank Algorithm uに対してリンク しているページv vから出ている リンクの本数 vというページの ランク
20.
© 2020 Dahdit
K.K., All rights reserved. 20 Image of Simplified PageRank Algorithm
21.
© 2020 Dahdit
K.K., All rights reserved. 21 Matrix Notation
22.
© 2020 Dahdit
K.K., All rights reserved. 22 Simple Problem: Rank Sink → Rank source というアイディアを導入
23.
© 2020 Dahdit
K.K., All rights reserved. 23 PageRank w/ Rank Source
24.
© 2020 Dahdit
K.K., All rights reserved. 24 Random Surfer Model
25.
© 2020 Dahdit
K.K., All rights reserved. 25 Conversion of the Algorithm
26.
© 2020 Dahdit
K.K., All rights reserved. 26 まとめ • Googleは “PageRank” というアルゴリズムを導入することによ り、他の検索エンジンよりも抜きん出た性能を発揮した • その “PageRank” アルゴリズムの原点は、シンプルなものである • 私たちにも “Next Google” になるチャンスはある!
27.
© 2020 Dahdit
K.K., All rights reserved. 27 Reference • http://baba.la.coocan.jp/wais/pagerank.html
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