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正準相関分析




 @_akisato
今回の流れ

• 概念的な話 (30%)
      –   何をする方法か?
      –   他の多変量解析との関係は?
      –   生成モデルと関係があるの?
      –   何に使えるか?


• 解析的な話 (70%)
      –   何を解けば良いか?: 標準正規化データの場合
      –   定式化: まじめにやります
      –   次元数の決定方法
      –   他の多変量解析との関係 再考

Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 2
何をする方法なのか?




        2組の多次元変量の間の相関関係を調べる、統計解析手法の1つ
                         [出展] 涌井、涌井 “図解でわかる多変量解析”、日本実業出版社

Topic Lecture 2009.6.8    Presented by Akisato Kimura   Page 3
他の多変量解析との関係性は?



多次元変量を                   正準相関分析                             多次元変量の
 2組に拡張                                                       制約を排除



               主成分分析                                判別分析



                          目的変量yを
                         多次元変量に拡張
                          重回帰分析




Topic Lecture 2009.6.8        Presented by Akisato Kimura     Page 4
生成モデルとの関係は?

 • 正準相関分析の過程は、
   Gaussianを仮定したpLSAと(ほぼ)一致
      – 正しく言えば、正準相関変量同士の相関を
        1とする極限がGaussian pLSAと等価

          Probabilistic latent
                                              Canonical correlation
          semantic analysis
                                                 analysis (CCA)
               (pLSA)




第1変量群            潜在変数       第2変量群   第1変量群             正準相関変量      第2変量群


Topic Lecture 2009.6.8              Presented by Akisato Kimura       Page 5
簡単な例

• 以下のような例を考える。

      – このとき、XとYの共分散行列を計算すると、
                               相関なし?


      – 正準相関分析により変換を求めて、
        変換先の共分散行列を求めると、

                                正しい相関を獲得

      – 実はこういう構造になっていた。



Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 6
何に使えるのか?

• 他の多変量解析ほどは、使われていない。

• メディア処理関係
      – 画像検索 [栗田ら 1992] [中山ら 2007]
      – インターモーダル学習
        [赤穂ら 1997] [Hardoon et al. 2003] [石黒ら 2004]
      – 話者適応 [桜木、有木 1997]
• その他
      – 実験データの解析
        [Borga et al. 2002] (fMRI) [末谷ら 2008] (カオス同期)
      – 経済指標の解析 [岡本 1985]

Topic Lecture 2009.6.8        Presented by Akisato Kimura   Page 7
定式化: 準備

• 2組の多次元変量群が与えられているとする。




• 平均・共分散行列




Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 8
先に答え: 標準正規化されたデータの場合

• 各変量群が標準正規化されている
  特別な場合を考える。

• このときは、以下の固有値問題を解けば良い。

                                         ※ XとYが逆でもOK。




• 当然出る疑問
      – この意味は何だろう?
      – 一般の場合はどうなるのか?


Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 9
定式化: 準備

• 2組の多次元変量群が与えられているとする。

                             ※ 簡単のため平均0を仮定します。



• 変換先の変量同士の相関が最大となるような
  変換   を求めたい。


                                                       内積




Topic Lecture 2009.6.8   Presented by Akisato Kimura        Page 10
定式化: 目的関数の変形

• 目的関数を多次元変量の共分散行列で表現

                                                     Empirical
                                                     expectationで置換




                                                            共分散行列の
                                                            定義



      – 注意:変換            を定数倍しても目的関数の値は不変
Topic Lecture 2009.6.8      Presented by Akisato Kimura         Page 11
定式化: 問題の変換

• 各変換を以下のようにして正規化

      – 正規化の意味: 変換先の変量を標準正規化する


• Lagrange未定定数法を用いて、問題を書き直す。




• 各変換で微分すると・・・



Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 12
定式化: 最終形態

• 共分散行列が正則であるとすると、
  下記の一般化固有値問題に変形可能


                                                   4


• 共分散行列のCholesky分解を用いることで、
  通常の固有値問題に変形可能
                                                       2

                                                       1

                                                       3


Topic Lecture 2009.6.8   Presented by Akisato Kimura       Page 13
再考: 標準正規化されたデータの場合

• 各変量群が標準正規化されている
  特別な場合を考える。



• 先程の結果から、以下の固有値問題を得る。
      – Cholesky分解不要




Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 14
変換変量の次元数の決定

  • Bartlett検定 [1] により決定
         – 固有値問題を解くことで     個の固有値を得る。
         – 第d番目の固有値を採用するかどうかを判定する際、
           以下の量を考える。



         – この量が、漸近的に自由度                                                                                          の
             分布に従うことが知られている(らしい)。
         – 任意に有意水準を決定し、仮説検定。



[1] M.S.Bartlett “The General Canonical Correlation Distribution,” Ann. Math. Statist., Vol.18, No.1, pp.1-17, 1947.
    http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&handle=euclid.aoms/1177730488

  Topic Lecture 2009.6.8                                          Presented by Akisato Kimura                          Page 15
多変量解析同士の関係: 準備

• 多くの多変量解析手法は、
  以下の最適化問題を解く構造になっている。




• 変換 に正規化拘束条件を課すと、
  実は以下の一般化固有値問題と等価。

      – 導出は先ほどとほぼ同じなので、省略。


• 多変量解析の違いは、行列                        の違いだけ。
Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 16
多変量解析同士の関係

• 主成分分析
                                           (主成分の正規化)



• 判別分析

                                            (判別射影軸の正規化)


• 重回帰分析




Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 17
多変量解析同士の関係

• 重回帰分析




• 正準相関分析




Topic Lecture 2009.6.8   Presented by Akisato Kimura   Page 18
おわりに
• 参考文献
      – 涌井、涌井 “図解でわかる多変量解析”、日本実業出版社
      – Bach, Jordan “A probabilistic interpretation of canonical
        correlation analysis,” Technical Report, Univ. California,
        Berkeley, 2005
      – Borga “Canonical correlation analysis: A tutorial,” 2001.
      – Sugiyama, Ide, Nakajima, Sese “Semi-supervised local Fisher
        discriminant analysis for dimensionality reduction,” Lecture Notes
        in Computer Science, Proc. PAKDD2008.
      – Wikipedia: Canonical correlation analysis




Topic Lecture 2009.6.8                 Presented by Akisato Kimura   Page 19

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