I am a researcher interested in machine learning and natural language processing.

  • Email: hakobaya at yahoo-corp.jp
  • URL: http://hayatokobayashi.com/

Biography

Work Experience

  • 2013.5 - present Yahoo! JAPAN Research, Yahoo Japan Corporation
  • 2010.4 - 2013.4 Corporate Research and Development Center, Toshiba Corporation

Education

  • 2007.4 - 2010.3 Ph.D. (Information Science), Graduate School of Information Sciences, Tohoku University
  • 2005.4 - 2007.3 M.S., Graduate School of Information Science and Electrical Engineering, Kyushu University
  • 2001.4 - 2005.3 B.S., Department of Physics, Kyushu University

Publications

Peer Reviewed Conference Papers

  1. Nobuhiro Kaji and Hayato Kobayashi, "Incremental Skip-gram Model with Negative Sampling", under review. (link)
  2. Taiji Suzuki, Heishiro Kanagawa, Hayato Kobayashi, Nobuyuki Shimizu, and Yukihiro Tagami, "Minimax Optimal Alternating Minimization for Kernel Nonparametric Tensor Learning", In Advances in Neural Information Processing Systems 29 (NIPS 2016), pages 3783-3791. Curran Associates, Inc, 2016. (pdf)
    (Acceptance rate of long papers: 23% = 568/2500)
  3. Kohei Sugawara, Hayato Kobayashi, and Masajiro Iwasaki, "On Approximately Searching for Similar Word Embeddings", In Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (ACL 2016), pages 2265-2275. Association for Computational Linguistics, 2016. (pdf, code)
    (Acceptance rate of long papers: 26% = 231/897)
  4. Heishiro Kanagawa, Taiji Suzuki, Hayato Kobayashi, Nobuyuki Shimizu, and Yukihiro Tagami, "Gaussian process nonparametric tensor estimator and its minimax optimality", In Proceedings of the 33rd International Conference on Machine Learning (ICML 2016), pages 1632-1641. JMLR.org, 2016. (pdf)
    (Acceptance rate: 24% = 322/1327)
  5. Kohei Yamamoto, Hayato Kobayashi, Yukihiro Tagami, and Hideki Nakayama. "Multimodal Content-Aware Image Thumbnailing", In Proceedings of the 25th International Conference Companion on World Wide Web (WWW 2016), pages 129-130. International World Wide Web Conferences Steering Committee, 2016. (pdf)
    (Acceptance rate of poster papers: 40% = 72/182)
  6. Tomoya Yamazaki, Nobuyuki Shimizu, Hayato Kobayashi, and Satoshi Yamauchi. "Weighted Micro-Clustering: Application to Community Detection in Large-Scale Co-Purchasing Networks with User Attributes", In Proceedings of the 25th International Conference Companion on World Wide Web (WWW 2016), pages 131-132. International World Wide Web Conferences Steering Committee, 2016. (pdf)
    (Acceptance rate of poster papers: 40% = 72/182)
  7. Yukihiro Tagami, Hayato Kobayashi, Shingo Ono, and Akira Tajima. "Distributed Representations of Web Browsing Sequences for Ad Targeting", In WSDM 2016 Workshop on Ad Targeting at Scale (TargetAd 2016). (pdf)
  8. Phiradet Bangcharoensap, Tsuyoshi Murata, Hayato Kobayashi, and Nobuyuki Shimizu. "Transductive Classification on Heterogeneous Information Networks with Edge Betweenness-based Normalization", In Proceedings of the 9th ACM International Conference on Web Search and Data Mining (WSDM 2016), pages 437-446. ACM, 2016. (pdf)
    (Acceptance rate: 18% = 67/368)
  9. Hayato Kobayashi, Masaki Noguchi, and Taichi Yatsuka. "Summarization Based on Embedding Distributions", In Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing (EMNLP 2015), pages 1984-1989. Association for Computational Linguistics, 2015. (pdf)
    (Acceptance rate of short papers: 22% = 155/700)
  10. Hayato Kobayashi, Kaori Tanio, and Manabu Sassano. "Effects of a Game on User Engagement of a Spoken Dialogue System", In Proceedings of the 16th Annual SIGdial Meeting on Discourse and Dialogue (SIGDIAL 2015), pages 422-426. Association for Computational Linguistics, 2015. (pdf)
    (Acceptance rate of short papers: 40% = 17/42)
  11. Phiradet Bangcharoensap, Hayato Kobayashi, Nobuyuki Shimizu, Satoshi Yamauchi, and Tsuyoshi Murata. "Two Step Graph-based Semi-supervised Learning for Online Auction Fraud Detection", In Proceedings of the European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML PKDD 2015), Part III, volume 9286 of LNCS, pages 165-179. Springer International Publishing, 2015. (pdf)
    (Acceptance rate of industrial papers: 29% = 12/42)
  12. Yukihiro Tagami, Hayato Kobayashi, Shingo Ono, and Akira Tajima. "Modeling User Activities on the Web using Paragraph Vector", In Proceedings of the 24th International Conference Companion on World Wide Web (WWW 2015), pages 125-126. ACM, 2015. (pdf)
    (Acceptance rate of poster papers: 33% = 72/220)
  13. Toshiaki Nakazawa, Sadao Kurohashi, Hayato Kobayashi, Hiroki Ishikawa, and Manabu Sassano. "3-step Parallel Corpus Cleaning using Monolingual Crowd Workers", In Proceedings of the 2015 Conference of the Pacific Association for Computational Linguistics (PACLING 2015), volume 593 of CCIS, pages 79-93. Springer Singapore, 2015. (pdf)
    (Acceptance rate of long papers: 40% = 18/45)
    Nakazawa won the best presentation award.
  14. Daisuke Kawahara, Yuichiro Machida, Tomohide Shibata, Sadao Kurohashi, Hayato Kobayashi, and Manabu Sassano. "Rapid Development of a Corpus with Discourse Annotations using Two-stage Crowdsourcing", In Proceedings of the 25th International Conference on Computational Linguistics (COLING 2014), pages 269-278. Dublin City University and Association for Computational Linguistics, 2014. (pdf)
    (Acceptance rate: 31% = 217/705)
  15. Hayato Kobayashi. "Perplexity on Reduced Corpora", In Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics (ACL 2014), pages 797-806. Association for Computational Linguistics, 2014. (pdf)
    (Acceptance rate of long oral presentations: 17% = 95/572)
  16. Hayato Kobayashi, Hiromi Wakaki, Tomohiro Yamasaki, and Masaru Suzuki. "Topic Models with Logical Constraints on Words", In Proceedings of Workshop on Robust Unsupervised and Semisupervised Methods in Natural Language Processing (ROBUS 2011), pages 33-40. 2011. (pdf)
    (Acceptance rate: 55% = 6/11)
  17. Kengo Matsuta, Hayato Kobayashi, and Ayumi Shinohara. "Multi-Target Adaptive A*", In Proceedings of the 9th International Conference on Autonomous Agents and MultiAgent Systems (AAMAS 2010), pages 1065-1072. IFAAMAS, 2010. (pdf)
    (Acceptance rate: 24% = 163/685)
  18. Tatsuya Kasai, Hayato Kobayashi, and Ayumi Shinohara. "The Size of Message Set Needed for the Optimal Communication Policy", In Proceedings of the 7th European Workshop on Multi-Agent Systems (EUMAS 2009). (pdf)
  19. Hayato Kobayashi and Ayumi Shinohara. "Complexity of Teaching by a Restricted Number of Examples", In Proceedings of the 22nd Anual Conference on Learning Theory (COLT 2009), pages 293-302. Omnipress, 2009. (pdf)
    (Acceptance rate: 30% = 40/133)
  20. Tatsuya Kasai, Hayato Kobayashi, and Ayumi Shinohara. "Improvement of the Performance by using Received Message on Learning of Communication Codes", In Proceedings of the 8th International Conference on Autonomous Agents and MultiAgent Systems (AAMAS 2009), pages 1229-1230. IFAAMAS, 2009. (pdf)
    (Acceptance rate of extended abstracts: 15% = 9/60)
  21. Hayato Kobayashi, Tsugutoyo Osaki, Tetsuro Okuyama, Akira Ishino, and Ayumi Shinohara. "Development of an Augmented Environment and Autonomous Learning for Quadruped Robots", In RoboCup 2008: Robot Soccer World Cup XII, volume 5399 of LNCS, pages 109-120. Springer-Verlag, 2009.
    (Acceptance rate: 40% = 36/91)
  22. Hayato Kobayashi, Kohei Hatano, Akira Ishino, and Ayumi Shinohara. "Autonomous Learning of Ball Passing by Four-legged Robots and Trial Reduction by Thinning-out and Surrogate Functions", In Proceedings of the 10th International Conference on Intelligent Autonomous Systems (IAS-10), pages 145-154. IOS Press, July 2008.
    (Acceptance rate: 63% = 50/80)
  23. Hayato Kobayashi, Kohei Hatano, Akira Ishino, and Ayumi Shinohara. "Reducing Trials by Thinning-out in Skill Discovery", In Proceedings of the 10th International Conference on Discovery Science (DS2007), volume 4755 of LNCS, pages 127-138. Springer-Verlag, 2007.
    (Acceptance rate: 31% = 17/55)
  24. Hayato Kobayashi, Tsugutoyo Osaki, Eric Williams, Akira Ishino, and Ayumi Shinohara. "Autonomous Learning of Ball Trapping in the Four-legged Robot League", In RoboCup 2006: Robot Soccer World Cup X, volume 4434 of LNCS, pages 86-97. Springer-Verlag, 2007.
    Best student award nomination.
    (Acceptance rate: 15% = 22/143)
  25. Hayato Kobayashi, Akira Ishino, and Ayumi Shinohara. "A Framework for Advanced Robot Programming in the RoboCup Domain", In Proceedings of the 9th International Conference on Intelligent Autonomous Systems (IAS-9), pages 660-667. IOS Press, March 2006.

Peer Reviewed Journal Articles

  1. Hayato Kobayashi, Tsugutoyo Osaki, Tetsuro Okuyama, Joshua Gramm, Akira Ishino, and Ayumi Shinohara. "Development of an Interactive Augmented Environment and its Application to Autonomous Learning for Quadruped Robots", IEICE Transactions on Information and Systems. E92-D(9):1752-1761, 2009.
  2. Hayato Kobayashi, Kohei Hatano, Akira Ishino, Ayumi Shinohara. "Thinning-out: A Method to Reduce Trials in Skill Discovery of a Robot" (in Japanese), Transactions of the Japanese Society for Artificial Intelligence, Vol. 24, No. 1, pages 191-202, 2009.

Technical Papers

  1. Akira Ishino, Ayumi Shinohara, and Hayato Kobayashi. "Jolly Pochie 2007: Team Description Paper", In RoboCup 2007: Robot Soccer World Cup XI, LNCS, CDROM. Springer-Verlag, to appear.
  2. Hayato Kobayashi, Jun Inoue, Tsugutoyo Osaki, Tetsuro Okuyama, Shuhei Yanagimachi, Takahito Sasaki, Keisuke Oi, Seiji Hirama, Akira Ishino, Ayumi Shinohara, Akihiro Kamiya, Satoshi Abe, Wataru Matsubara, Tomoyuki Nakamura. Jolly Pochie Technical Report in RoboCup 2006, Technical report, Jolly Pochie, 2006.
  3. Hayato Kobayashi, Akira Ishino, and Ayumi Shinohara. "Jolly Pochie 2006: Team Description Paper", In RoboCup 2006: Robot Soccer World Cup X, volume 4434 of LNCS, CDROM. Springer-Verlag, 2007.
  4. Hayato Kobayashi, Tsugutoyo Osaki, Akira Ishino, Jun Inoue, Narumichi Sakai, Satoshi Abe, Shuhei Yanagimachi, Tetsuo Okuyama, Akihiro Kamiya, Kazuyuki Narisawa, and Ayumi Shinohara. "Jolly Pochie Technical Report RoboCup 2005", Technical report, Jolly Pochie, 2005.
  5. Jun Inoue, Hayato Kobayashi, Akira Ishino, Ayumi Shinohara. "Jolly Pochie 2005 in the Four Legged Robot League", In RoboCup 2005: Robot Soccer World Cup IX, volume 4020 of LNCS, CDROM. Springer-Verlag, 2006.