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Rでtwitterのクラスタを
   あぶりだしてみた
favorite機能による重み付きグラフ構造を用いた
        twitterの社会ネットワーク分析


       Tsukuba.R#4
        @y_benjo
自己紹介
• twitter id : y_benjo
• hatena id : repose
  – http://d.hatena.ne.jp/repose
• 春から院生
• 専門とか特にない
• LTということで




• 数式もプログラムも少なめでいきます
Twitter
twitterではよく「クラスタ」
      とか言われます
ITクラスタ
変態クラスタ
アニメアイコンクラスタ
女装クラスタ
これをどうにか分析できないか
というわけでやってみる
仮説:
クラスタ内で互いにふぁぼりあう
構想(1)
• Twitterの人間関係をグラフとして扱う
• その際、「どのユーザが誰の発言をfavっ
  ているか」を使って重み付有向グラフに
  してみる
 – fav:ある発言を「お気に入り」にいれる機能。
  • 「面白い発言」への反応
 – 有向グラフ:AからBにはつながっているが、
   BからAにはつながっていないような、非対称
   なグラフ
構想(2)
• クラスタリングはハードクラスタリング
  を
 – ユーザがひとつのクラスタにのみ分割される
 – 「俺はつくばクラスタで変態クラスタだな」
   などというクラスタリングは無し
 – フゔジゖクラスタリングだとクラスタの重複
   が可能だが、触ったことが無いので
まずはデータ収集
はじめてのクロール
whitelistを貰って
 API叩きまくる
最初は
グラフをプロットして目視で分割
そこでRのigraphパッケージ
• install.packages(“igraph”)
• 隣接行列からグラフを簡単に作れる優れ
  もの
• plotも簡単
• Cytoscapeと組み合わせるともっと簡単
• これで勝つる!!!!
もうちょっと真っ当にやる
既存研究ありすぎワロタ
社会ネットワーク分析
• A Clauset, MEJ Newman, C Moore:
  – Finding community structure in very large
    networks (2004)
• J. Duch and A. Arenas:
  – Community detection in complex
    networks using extremal optimization
    (2005)


• ここらへんを試してみる
大雑把な考え方




• なる指標を考えて、この値が最大になる
  ようにグラフをクラスタに分割していく
Rで実装する
• ソースは汚すぎるので…
• 慣例に従って有効グラフを無向グラフに
  変換
 – 具体的には、AがBをfavった回数とBがAを
   favった回数を平均してA-B間の重みに
少し考える
• ゕルゴリズムの
  はO(N^2ln^2)
• ユーザごとの重
  みの総和を図に
  してみても、
  5000id全て計算
  するのは無駄っ
  ぽそう…
 – とりあえず329
   人分
計算:48時間ぐらい
結果:
329userが75クラスタに
       傾向:
  細かく分割されすぎ
サイズにばらつきありすぎ
大きなクラスタをいくつか紹介

329userの全クラスタ内訳は
   blogにアップします
変態クラスタ(最大、90user)
             GUMIMI, HOJ, Hajimepg, Palpha,
             SAN_Morishi, Sebastianus, TEtra11, Toyolina,

  GUMIMI     Wing_of_Blood, aki426, aorenjar, bombtter,
             camelletgo, ch1haya, chap_py, chcbigz, chief_szk,
             choconono, cress_cc, emakko, enpitsu, evil07,
             f_jiro, fortunathefate, fune, garandou, gokujo,

  zeppel     ha_ma, ha_ru_ka, halciondaze, hazime1373,
             hetaremozu, hironao, itati0, k_katsura,kaiware007
             kazusap, kek_kuten, konaken, koukai, kuroreva,
             kuzu_doh, kyabesuke, lakililac, llcheesell, lolipuni,
             m_soba, masumizaru, meba, migelfutosi,
             mio_sakamoto, miru, myu65, mywalrus, nekocafe,

  Hajimepg   ni_no_, nisenisetila, nurutema, ocha39, onicks2,
             ooabikoo, p_n_y, poyow, purelightway, ragusk,
             rarihoma, rokudenashi, ruehaduki, sakakiyu,
             sayn0, shitu, shy_azusa, sio_halfmoon, suiginex,
             suiginth, syochin, syounenX, tato256, tc_501, ukix,
             wakatter, xmmm, y883, ycums, ykzts, yteppei,
             yumeka_, zeppel, zero_zaki_,
ITっぽいクラスタ(60user)
               Ett, KIMAGURE, VoQn, a_dach, bambico,
               bulkneets, chrcc, deadpop, eigokun,enraku
   bulkneets   error403, fkgw, fuba, fuba_recorder,
               hajime, harsch, hazy_moon, hironica,
               hoge_systemz, irm_fyuk, isbsh, jazzanova,

   kotoriko    jinon, kagawa, kanamoken, kkshow,
               kotoriko, kudan_, kusigahama, kyoujin,
               lalha, m0h1can, marco11, mayutan,
               morygonzalez, nancii, natant12, nipotan,
               oquno, penguinana, pha, placebogirl,

   yuiseki     sachi_volta, saeko, saetomin, send_, slyl,
               snoa, todesking, toriko, totoon, ugnews,
               umelabo, wazurai, wyinoue, y_benjo,
               yodaka, youpy, yuiseki,
ハチロククラスタ(11user)

  Misho
            Misho, T_Hash,
            hayamiz, kaeru_san,
  kaeru_san
            limitusus, mickey24,
            natsutan, sak65536,
            syou6162, tencube,
  T_hash
評論?クラスタ(8user)

 hanemimi
             esehara, hanemimi,
 kanose      kanose, kisoem,
             matakimika, okadaic,
             tsuda, wideangle,
 wideangle
補足
• その他のクラスタは1~4人で構成される
  ものが多い
 – クラスタの構成userを見てみると、ある程度
   妥当性がありそうな面子が
• クラスター分析全般に言えることですが、
  これが絶対的な分割ではない
 – fav情報のみで行っているという事を忘れずに
結論
• 結構それっぽい感じで抽出できたと思う
 – 今回は小規模だったが、極端な話5000user
   で計算しても同様のクラスタが得られるので、
   そう考えると面白いんじゃないかと
• 欠点:計算時間かかりすぎ
 – 行列計算が楽なだけでRでやる必要があまり
   ない
 – 定期的にクロールさせてクラスタの状況を更
   新していく、とかさせてみたい……
ありがとうございました

使用環境:R, Ruby, Meadow (ruby-mode ,ESS)
参考文献
 :Finding community structure in very large networks (2004)
 :Community detection in complex networks using extremal
 optimization (2005)

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