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2005.11.10

IBIS2005

IBIS2005に来てます。
機械学習の話。

午前の構造化データの機械学習は面白かった。

最初はグラフ構造からの頻出パターンのマイニング。gSpan,FGS,GASTON等の解説。やはり、ここがいいよという話。オランダは幾何強いなぁ。土地柄のせい?

次のグラフカーネルを使って化学化合物の分類では、Tanimoto係数参照が構造物の類似度として使われるということで、これでKernelを作ろうという話。グラフが与えられた時、最初に、グラフ中(化合物中)の各頂点から深さ優先探索で深さdまでのpath(フィンガープリント)をハッシュの初期値にして、そのハッシュ値のところが1になったbit配列を用意する。同じ部分構造を持つ場合、同じ場所に1がたっている。グラフX,Yのtanimotoカーネルは、これらから作られたbit配列x, yを使って (x & y) / (x | y) で高速に求められる。性能もいいらしい。

構造データのラベル付け学習モデルの設計では、普通のCRF(全損失から導出。全部のラベルがあっていないとだめ)とPoint-wise CRF(点損失から導出。それぞれのラベルがあっていればよい)の線形和を作ると、k次マルコフの損失関数を最小化するやつができるという話。不思議に思えたが、直感的な図を見たらすぐ理解できた。これをSemi-CRFの上に導入したら、k次Semi Markovができるのかなぁ。そんな単純じゃないのかなぁ

Mochihashiさんに、その後言語モデルや確率モデルの話を教えてもらいました。いろいろ謎だったことが解けました。どうもです。内側(入力側から)のモデルの豊かさに興味を持つ人と、外側(出力側)のモデルの豊かさに興味を持つ人という話が興味深い

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Comments

Organized Session に津田さんと竹内さんですか。
Graph Mining 楽しそう。統数研の人がこんなに来るなら行けばよかった。
来年は行こうっと。

Posted by: dasm | 2005.11.10 02:55 PM

あ、多いのは統数研じゃなくて産総研のほうでした orz

Posted by: dasm | 2005.11.10 02:57 PM

統数研の方もたくさんいらっしゃってますよ。
様々な分野の人が来ていて活気があります。

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学会・研究会 学習理論や機械学習に関連した会議や会議報告についてまとめましょう. ID は ibis でパスワードは VC 次元の V のフルスペルです(頭だけ大文字) Cのフルスペルだと誰も書けません・・(いば) 学会・研究会 関連学会 2006年 2005年 ↑関連学... [Read More]

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» Meeting [PukiWiki/TrackBack 0.1]
学会・研究会 学習理論や機械学習に関連した会議や会議報告についてまとめましょう. ID は ibis でパスワードは VC 次元の V のフルスペルです(頭だけ大文字) Cのフルスペルだと誰も書けません・・(いば) 学会・研究会 関連学会 2006年 2005年 ↑関連学... [Read More]

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» Meeting [PukiWiki/TrackBack 0.1]
学会・研究会 学習理論や機械学習に関連した会議や会議報告についてまとめましょう. ID は ibis でパスワードは VC 次元の V のフルスペルです(頭だけ大文字) Cのフルスペルだと誰も書けません・・(いば) 学会・研究会 関連学会 2006年 2005年 ↑関連学... [Read More]

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» IBIS [PukiWiki/TrackBack 0.1]
情報論的学習理論ワークショップ (IBIS) 初期は情報理論とその応用学会によって開催されていましたが, 2001年からは信学会時限専門委員会 (IBIS-TG) の主催になりました. 情報論的学習理論ワークショップ (IBIS) IBIS2005 (早稲田大学) &(2005); IBIS2004 (... [Read More]

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» IBIS [PukiWiki/TrackBack 0.1]
情報論的学習理論ワークショップ (IBIS) 初期は情報理論とその応用学会によって開催されていましたが, 2001年からは信学会時限専門委員会 (IBIS-TG) の主催になりました. 情報論的学習理論ワークショップ (IBIS) IBIS2005 (早稲田大学) IBIS2004 (早稲田大学) ... [Read More]

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