« CRF++ | メイン | file upload script for sourcefourge.jp »

2005年06月06日

Piecewise CRF

http://www.cs.umass.edu/~mccallum/papers/lcrf-nips2004.pdf

去年のNIPS WSで Andrew McCallum が提案した
新しい sequential ラベリング手法

基本的には MEMM を出発点としているが、label-bias が発生するので
それを巧妙に回避している。MEMM は、学習データのみ使って
前状態から次の状態への遷移を学習する。この時、学習データに
出現しなかった遷移は学習対象にならない。対象外の
遷移は他の理由(グラフのトポロジーなど)に影響を受けることになる。
これが label bias の私の理解。

そこで、学習データに出現しなかった遷移のたの特別な状態
NOTA を設ける。学習データに出現しなかった遷移はすべて
NOTA に遷移すると考える。

これだけの設定であとは MEMM を作る。式展開を進めていくと
きわめてスッキリした形になる。おもしろい。あと、初期の
berief propergation との類似展も指摘されてるみたいだ。
性能も実は CRF よりいい場があるそうだ。

ただ、decode が少し遅いのではないだろうか。
各状態ごとに確率の正規化が行われるので、計算量的には
CRF と変わらないし、viterbi で解けるとはいえ、ちょっと遅い気がする。

投稿者 taku : 2005年06月06日 07:46

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http://chasen.org/~taku/blog/mt-tb.cgi/141

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