JP4141460B2 - 自動分類生成 - Google Patents
自動分類生成 Download PDFInfo
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- JP4141460B2 JP4141460B2 JP2005184985A JP2005184985A JP4141460B2 JP 4141460 B2 JP4141460 B2 JP 4141460B2 JP 2005184985 A JP2005184985 A JP 2005184985A JP 2005184985 A JP2005184985 A JP 2005184985A JP 4141460 B2 JP4141460 B2 JP 4141460B2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/30—Information retrieval; Database structures therefor; File system structures therefor of unstructured textual data
- G06F16/36—Creation of semantic tools, e.g. ontology or thesauri
- G06F16/367—Ontology
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99933—Query processing, i.e. searching
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99933—Query processing, i.e. searching
- Y10S707/99935—Query augmenting and refining, e.g. inexact access
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99941—Database schema or data structure
- Y10S707/99942—Manipulating data structure, e.g. compression, compaction, compilation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99941—Database schema or data structure
- Y10S707/99943—Generating database or data structure, e.g. via user interface
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- Animal Behavior & Ethology (AREA)
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- Databases & Information Systems (AREA)
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- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Description
L=Sum{Sum[n(di,wjk)log(P(di,wjk)),j],i,k}
上記の式中、n(di,wjk)はノードkでの文書di内の用語wjの出現回数、P(di,wjk)は任意の文書に出現する用語の確率に基づく、文書di内に出現するノードkの用語wjの確率である。各ノードに関連付けられている用語の確率は、次いで対数尤度を最大にするように繰り返し調整することができる。最大化は、絶対最大値または相対最大値とすることができる。結果として得られたこれらの用語の確率は、図3のベクトル340、350に格納され、データストア内のそれぞれの子ノードに関連付けられる。このように、2つの子ノード(または図1の親ノード152、153)のそれぞれは、訓練用語のリスト(用語ベクトル320)、および1組の訓練文書が各子ノードの用語から形成される対数尤度を最大にするために最適化された文書に出現する各用語のそれぞれの確率(用語確率ベクトル340、350)に関連付けられる。
Sj=Sum[P(wj)*log(P(wi)/Zj(wi))]
式中、SjはKl divergence、P(wi)は用語wiが所与の文書内で検出される確率、およびZj(wi)は用語wiがノードjで検出される確率である。上記の式の対称的なバージョンを含めて、他の適した系統的に定められた距離または類似度も適していることを理解されたい。
210 訓練文書
220 ツリー生成器
240 文書ソータ
242 文書
260 情報取り出しシステム
310 用語生成器
320 用語ベクトル
330 ノード生成器
360 文書割当器
362,364,366 文書セット
370 ツリーマネージャ
Claims (16)
- コンピュータ実行可能なコンポーネントを有するコンピュータ記録媒体であって、該コンポーネントは、ノード生成器、文書割当器、ツリーマネージャ、文書ソータを含み、
(a)該ノード生成器は、1組の訓練文書に基づいた訓練用語のリストを受信し、第1の確率の組を含む第1の兄弟ノードを生成し、第2の確率の組を含む第2の兄弟ノードを生成するように構成され、前記第1の確率の組は、前記訓練用語のリスト内の用語ごとに、前記用語が文書に出現する確率を含み、前記第2の確率の組は、前記訓練用語のリスト内の用語ごとに、前記用語が文書に出現する確率を含み、前記第1及び第2の兄弟ノードは、親ノードを分割して生成され、該ノード生成器は、第1および第2のノードに関連付けられた訓練文書のすべてについての尤度を最大にする期待値最大化アルゴリズムに基づいて、前記第1および第2の確率の組を決定するものであり、
(b)該文書割当器は、前記第1および第2の確率の組に基づいて、前記1組の訓練文書の各文書を、前記第1の兄弟ノード、前記第2の兄弟ノード、およびヌルセットから成るグループのうちの少なくとも1つに関連付けるように構成され、前記文書は第1の文書セットを形成する前記第1の兄弟ノードに関連付けられ、前記文書は第2の文書セットを形成する前記第2の兄弟ノードに関連付けられるものであり、
(c)該ツリーマネージャは、前記第1の文書セットおよび第2の文書セットのうちの少なくとも一方を前記ノード生成器に接続して、前記ノード生成器および前記文書割当器の再帰的性能に基づいて、複数の兄弟ノードの階層を含むバイナリツリーデータ構造を作成するように構成され、
(d)該文書ソータは、新しい文書を、前記ノードと関連付けられた確率の各組に基づいて前記複数の兄弟ノードのうちの少なくとも1つのノードに関連付けるように構成され、前記ツリーマネージャが、該文書ソータによるアクセスのための前記バイナリツリーデータ構造を格納している、
コンピュータ記録媒体。 - 請求項1に記載のコンピュータ記録媒体において、前記文書ソータは、前記新しい文書と前記第1および第2の兄弟ノードのそれぞれとの間の統計距離を比較する、コンピュータ記録媒体。
- 請求項1に記載のコンピュータ記録媒体であって、前記1組の訓練文書を受信し、前記1組の訓練文書内の前記文書の少なくとも一部分に出現する用語に基づいて前記訓練用語のリストを生成するように構成されている用語生成器をさらに含む、コンピュータ記録媒体。
- 請求項3に記載のコンピュータ記録媒体において、前記用語生成器は、前記文書の少なくとも一部分に出現する前記用語の出現頻度に基づいて前記訓練用語のリストを生成する、コンピュータ記録媒体。
- 請求項3に記載のコンピュータ記録媒体において、前記用語生成器は、予め定められた排除用語のリストを考慮に入れる、コンピュータ記録媒体。
- 請求項1に記載のコンピュータ記録媒体において、前記文書割当器は、前記1組の訓練文書の各文書と、前記第1のノードおよび前記第2のノードのそれぞれとの間の統計距離値を決定する、コンピュータ記録媒体。
- 請求項6に記載のコンピュータ記録媒体において、前記文書割当器は、前記文書と前記第1のノードとの間の前記決定された距離値が予め定められた閾値を下回る場合、前記1組の訓練文書の文書を前記第1のノードに関連づける、コンピュータ記録媒体。
- 請求項6に記載のコンピュータ記録媒体において、前記距離値はKldivergence値である、コンピュータ記録媒体。
- コンピュータによる実施方法であって、該方法は、
(a)1組の訓練文書に基づいてバイナリ分類ツリーを作成するステップであって、前記バイナリ分類ツリーの各ノードは用語のリストに関連付けられ、前記各用語のリスト内の各用語は当該用語が前記ノードに与えられた文書に出現する確率に関連付けられ、最初にルートノードが作成されて、それが次にバイナリ分類ツリーの子ノードの作成に使用され、前記子ノードは、各親ノードを分割して作成され、前記バイナリ分類ツリーは、新しい文書を前記バイナリ分類ツリーのノードと関連付けるために格納され、該バイナリ分類ツリーを作成するステップは、前記1組の訓練文書内の各文書が前記バイナリ分類ツリーの2つの兄弟ノードのそれぞれに関連付けられている前記用語のリストによって生成される尤度を最大にする期待値最大化アルゴリズムに基づいて文書に出現する前記用語の各確率を決定するステップを含む、ステップと、
(b)新しい文書を当該文書と前記ノードとの間の距離値に基づいて前記バイナリツリーの少なくとも1つのノードに関連付けるステップと
を含む、方法。 - 請求項9に記載の方法において、前記距離値はKl divergenceに基づいて決定される、方法。
- 請求項10に記載の方法において、前記新しい文書は距離閾値を下回るKldivergenceを有するノードに関連付けられている、方法。
- 請求項10に記載の方法において、前記新しい文書を関連付けるステップは、前記新しい文書を、パスを有するノードであって前記パスにわたって最も小さいKldivergenceを有するノードに関連付けるステップを含む、方法。
- 請求項9に記載の方法において、前記バイナリ分類ツリーを作成するステップは、前記用語のリストに関連付けられている前記ノードの親ノードに関連付けられている前記用語のリストに基づいてノードに関連付けられる用語の各リストを決定するステップを含む、方法。
- 請求項9に記載の方法において、前記バイナリ分類ツリーを作成するステップは、前記1組の訓練文書の少なくとも一部分を第1の子ノード、第2の子ノード、およびヌルセットのうちの少なくとも1つに関連付けるステップを含む、方法。
- 請求項14に記載の方法において、前記訓練文書の少なくとも一部分を関連付けるステップは、各用語が前記第1の子ノードに関連付けられる各確率、および各用語が前記第2の子ノードに関連付けられる各確率に基づくものである、方法。
- コンピュータに、請求項9ないし15のいずれか一項に記載の方法の各ステップのすべてを実行させるためのプログラム・コードを有するコンピュータ・プログラム。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/881,893 US7266548B2 (en) | 2004-06-30 | 2004-06-30 | Automated taxonomy generation |
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JP2006018829A JP2006018829A (ja) | 2006-01-19 |
JP2006018829A5 JP2006018829A5 (ja) | 2008-02-14 |
JP4141460B2 true JP4141460B2 (ja) | 2008-08-27 |
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US (1) | US7266548B2 (ja) |
EP (1) | EP1612701A3 (ja) |
JP (1) | JP4141460B2 (ja) |
KR (1) | KR20060048583A (ja) |
CN (1) | CN1716256A (ja) |
BR (1) | BRPI0502591A (ja) |
CA (1) | CA2510761A1 (ja) |
MX (1) | MXPA05007136A (ja) |
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