Syntactic Approach for Efficient Identification in the Limit from Positive Data of Context-Free and Mildly Context-Sensitive Languages

• Project/Area Number: 20700124
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Intelligent informatics
• Research Institution: Hokkaido University
• Principal Investigator: YOSHINAKA Ryo Hokkaido University, 大学院・情報科学研究科, 学術研究員 (80466424)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 学習と知識獲得 / 計算論的学習 / 文法推論 / 形式言語理論 / 弱文脈依存言語

Research Abstract

Recently the literature showed that context-free languages with a special property reflecting an aspect of natural language phenomena are efficiently learnable from positive data. Generalizing the preceding research, our project has presented efficient algorithms that learn from positive data even richer classes of context-free languages as well as those of mildly context-sensitive languages, which handle some non-context-free phenomena observed in natural languages. Moreover, our research project has proposed techniques that learn even more expressive classes of languages from positive data with the aid of a teacher who answers limited questions from the learner.

Research Products

• [Journal Article] Efficient learning of multiple context-free languages with multidimensional substitutability from positive data. (2011)
  • Author(s): Ryo Yoshinaka
  • Journal Title: Theoretical Computer Science 412(19) Pages: 1821-1831
  • Peer Reviewed
• [Journal Article] Efficient learning of multiple context-free languages with multi-dimensional substitutability from positive data. (2011)
  • Author(s): Ryo Yoshinaka
  • Journal Title: Theoretical Computer Science Volume: 412 Pages: 1821-1831
  • Peer Reviewed
• [Journal Article] An elementary proof of a generalization of double Greibach normal form. (2009)
  • Author(s): Ryo Yoshinaka
  • Journal Title: Information Processing Letters 109(10) Pages: 490-492
  • Peer Reviewed
• [Journal Article] Learning efficiency of very simple grammars from positive data. (2009)
  • Author(s): Ryo Yoshinaka
  • Journal Title: Theoretical Computer Science 410(19) Pages: 1807-1825
  • Peer Reviewed
• [Journal Article] Learning Efficiency of Very Simple Grammars from Positive Data (2009)
  • Author(s): Yoshinaka, Ryo
  • Journal Title: Theoretical Computer Science 410 Pages: 1807-1825
  • Peer Reviewed
• [Journal Article] An Elementary Proof of Generalization of Greibach Normal Form (2009)
  • Author(s): Yoshinaka, Ryo
  • Journal Title: Information Processing Letters 109 Pages: 490-492
  • Peer Reviewed
• [Presentation] Distributional Learning of Abstract Categorial Grammars. (2011)
  • Author(s): Ryo Yoshinaka, Makoto Kanazawa
  • Organizer: The 6^<th> Conference on Logical Aspects of Computational Linguistics.
  • Place of Presentation: Montpellier, France.
  • Year and Date: 2011-07-01
• [Presentation] Distributional Learning of Extensions of Context-Free Grammars. (2011)
  • Author(s): Ryo Yoshinaka
  • Organizer: The 5^<th> International Workshop on Data-Mining and Statistical Science & the 7^<th> Workshop on Learning with Logics and Logics for Learning.[合同招待講演]
  • Place of Presentation: Osaka, Japan.
  • Year and Date: 2011-03-29
• [Presentation] Distributional Learning of Extensions of Context-Free Grammars (2011)
  • Author(s): Ryo Yoshinaka
  • Organizer: The 5th International Workshop on Data-Mining and Statistical Scienceおよびthe 7^<th> Workshop on Learning with Logics and Logics for Learning
  • Place of Presentation: 大阪大学中之島センター(大阪市)(共同招待講演)
  • Year and Date: 2011-03-29
• [Presentation] Polynomial-Time Identification of Multiple Context-Free Languages from Positive Data and Membership Queries. (2010)
  • Author(s): Ryo Yoshinaka
  • Organizer: The 10^<th> International Colloquium on Grammatical Inference.
  • Place of Presentation: Valencia, Spain.
  • Year and Date: 2010-09-15
• [Presentation] Polynomial-Time Identification of Multiple Context-Free Languages from Positive Data and Membership Queries (2010)
  • Author(s): Ryo Yoshinaka
  • Organizer: The 10^<th> International Colloquium on Grammatical Inference
  • Place of Presentation: ホテルメリアバレンシア(バレンシア,スペイン)
  • Year and Date: 2010-09-15
• [Presentation] Polynomial Time Learning of Some Multiple Context-Free Languages with a Minimally Adequate Teacher (2010)
  • Author(s): Ryo Yoshinaka, Alexander Clark
  • Organizer: The 15^<th> Conference on Formal Grammar
  • Place of Presentation: コペンハーゲン大学(コペンハーゲン,デンマーク)
  • Year and Date: 2010-08-08
• [Presentation] Chomsky-Schutzenberger-Type Characterization of Multiple Context-Free Languages. (2010)
  • Author(s): Ryo Yoshinaka, Yuichi Kaji, Hiroyuki Seki
  • Organizer: The 4^<th> International Conference on Language and Automata Theoryand Application.
  • Place of Presentation: Trier, Germany.
  • Year and Date: 2010-05-27
• [Presentation] Chomsky-Schutzenberger-Type Characterization of Multiple Context-Free Languages (2010)
  • Author(s): Ryo Yoshinaka, Yuichi Kaji, Hiroyuki Seki
  • Organizer: The 4^<th> International Conference on Language and Automata Theory and Application
  • Place of Presentation: トリア大学(トリア,ドイツ)
  • Year and Date: 2010-05-27
• [Presentation] Learning Mildly Context- Sensitive Languages with Multidimensional Substitutability from Positive Data. (2009)
  • Author(s): Ryo Yoshinaka
  • Organizer: The 20^<th> International Conference on Algorithmic Learning Theory.
  • Place of Presentation: Porto, Portugal.
  • Year and Date: 2009-10-04
• [Presentation] Learning Mildly Context-Sensitive Languages with Multidimensional Substitutability from Positive Data (2009)
  • Author(s): Ryo Yoshinaka
  • Organizer: The 20^<th> International Conference on Algorithmic Learning Theory
  • Place of Presentation: ポルト大学(ポルトガル)
  • Year and Date: 2009-10-04
• [Presentation] Identification in the Limit of k,l-Substitutable Context-Free Languages. (2008)
  • Author(s): Ryo Yoshinaka
  • Organizer: The 9^<th> International Colloquium on Grammatical Inference
  • Place of Presentation: St-Malo, France.
  • Year and Date: 2008-09-22
• [Presentation] Identification in the Limit of k, 1-Substitutable Context-Free Languages (2008)
  • Author(s): Yoshinaka, Ryo
  • Organizer: 9^<th> International Colloquium on Grammatical Inference
  • Place of Presentation: Palais du Grand Large, Saint-Malo, France
  • Year and Date: 2008-09-22
• [Book] Polynomial-Time Identification of Multiple Context-Free Languages from Positive Data and Membership Queries.(In ICGI.LNCS 6339) (2010)
  • Author(s): Ryo Yoshinaka
  • Publisher: Springer-Verlag
• [Book] Chomsky-Schutzenberger-Type Characterization of Multiple Context-Free Languages.(In LATA.LNCS 6031) (2010)
  • Author(s): Ryo Yoshinaka, Yuichi Kaji, Hiroyuki Seki
  • Publisher: Springer-Verlag
• [Book] Learning Mildly Context- Sensitive Languages with Multidimensional Substitutability from Positive Data.(In ALT.LNCS 5809) (2009)
  • Author(s): Ryo Yoshinaka
  • Publisher: Springer-Verlag
• [Book] Identification in the limit of k,l-Substitutable Context-Free Languages.(In ICGI.LNCS 5278) (2008)
  • Author(s): Ryo Yoshinaka
  • Publisher: Springer-Verlag