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Chikara Hashimoto, PhD

I am a research scientist at Rakuten Institute of Technology with special interests in Natural Language Processing.

​

  My research subject is knowledge acquisition from textual big data:

  • E-commerce technologies

  • Dialogue knowledge acquisition for intelligent personal assistants

  • Causality knowledge acquisition

  • Paraphrase, entailment, and contradiction knowledge acquisition

  • Word's domain knowledge acquisition

​

  I am also interested in:

  • Development of a computational grammar of Japanese based on HPSG

  • Interpretation of multiword expressions of Japanese

​

Ｃｏｎｔａｃｔ：　ｃｈｉｋａｒａ．ｈａｓｈｉｍｏｔｏ（ａｔ）ｇｍａｉｌ．ｃｏｍ

Selected Publications

  1. Chikara Hashimoto, Gautam Kumar, Shuichiro Hashimoto, and Jun Suzuki. Hunt for Buried Treasures: Extracting Unclaimed Embodiments from Patent Specifications. ACL 2023 Industry Track. Toronto, Canada. 2023.

  2. Chikara Hashimoto. Weakly Supervised Multilingual Causality Extraction from Wikipedia. 2019 Conference on Empirical Methods in Natural Language Processing and 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP 2019), Long paper. Hong Kong, 2019. (pdf) (code)

  3. Chikara Hashimoto and Manabu Sassano. Detecting Absurd Conversations from Intelligent Assistant Logs by Exploiting User Feedback Utterances. WWW 2018: The 2018 Web Conference, Research track, Full paper, pp.147-156. Lyon, France, 2018. (acm)

  4. Canasai Kruengkrai, Kentaro Torisawa, Chikara Hashimoto, Julien Kloetzer, Jong-Hoon Oh and Masahiro Tanaka. Improving Event Causality Recognition with Multiple Background Knowledge Sources using Multi-Column Convolutional Neural Networks. Proceedings of the 31st AAAI Conference on Artificial Intelligence (AAAI-17), pp. 3466-3473, San Francisco, California, USA, 2017. (pdf)

  5. Jong-Hoon Oh, Kentaro Torisawa, Chikara Hashimoto, Ryu Iida, Masahiro Tanaka and Julien Kloetzer. A Semi-Supervised Learning Approach to Why-Question Answering. Proceedings of the 30th AAAI Conference on Artificial Intelligence (AAAI-16), Long paper, pp.3022-3029. 2016. (pdf)

  6. Ryu Iida, Kentaro Torisawa, Chikara Hashimoto, Jong-Hoon Oh, and Julien Kloetzer. Intra-sentential Zero Anaphora Resolution using Subject Sharing Recognition. Proceedings of the Conference on Empirical Methods in Natural Language Processing (EMNLP 2015), Long paper, pp.2179–2189. Lisbon, Portugal, 2015. (pdf)

  7. Chikara Hashimoto, Kentaro Torisawa, Julien Kloetzer and Jong-Hoon Oh. Generating Event Causality Hypotheses through Semantic Relations. Proceedings of the 29th AAAI Conference on Artificial Intelligence (AAAI-15), Long paper, pp.2396–2403. 2015. (pdf)

  8. Chikara Hashimoto, Kentaro Torisawa, Julien Kloetzer, Motoki Sano, Istvan Varga, Jong-Hoon Oh and Yutaka Kidawara. Toward Future Scenario Generation: Extracting Event Causality Exploiting Semantic Relation, Context, and Association Features. Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics (ACL 2014), Long paper, pp.987-997. 2014. (pdf)

  9. Julien Kloetzer, Stijn De Saeger, Kentaro Torisawa, Chikara Hashimoto, Jong-Hoon Oh, Kiyonori Ohtake. Two-stage Method for Large-scale Acquisition of Contradiction Pattern Pairs using Entailment. Proceedings of the Conference on Empirical Methods in Natural Language Processing (EMNLP 2013), Long paper, pp.693–703. 2013. (pdf)

  10. Istvan Varga, Motoki Sano, Kentaro Torisawa, Chikara Hashimoto, Kiyonori Ohtake, Takao Kawai, Jong-Hoon Oh and Stijn De Saeger. Aid is Out There: Looking for Help from Tweets during a Large Scale Disaster. Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics (ACL 2013), Long paper, pp.1619–1629. 2013. (pdf)

  11. Jong-Hoon Oh, Kentaro Torisawa, Chikara Hashimoto, Motoki Sano, Stijn De Saeger and Kiyonori Ohtake. Why-Question Answering using Intra- and Inter-Sentential Causal Relations. Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics (ACL 2013), Long paper, pp.1733–1743. 2013. (pdf)

  12. Yulan Yan, Chikara Hashimoto, Kentaro Torisawa, Takao Kawai, Jun’ichi Kazama and Stijn De Saeger. Minimally Supervised Method for Multilingual Paraphrase Extraction from Definition Sentences on the Web. Proceedings of the 2013 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies (NAACL HLT 2013), Long paper, pp.63–73. 2013. (pdf)

  13. Chikara Hashimoto, Kentaro Torisawa, Stijn De Saeger, Jong-Hoon Oh, and Jun’ichi Kazama. Excitatory or Inhibitory: A New Semantic Orientation Extracts Contradiction and Causality from the Web. Proceedings of EMNLP-CoNLL 2012: Conference on Empirical Methods in Natural Language Processing and Natural Language Learning, Long paper, pp.619–630. 2012. 7. (paper , supplementary material)

  14. Jong-Hoon Oh, Kentaro Torisawa, Chikara Hashimoto, Takuya Kawada, Stijn De Saeger, Junichi Kazama and Yiou Wang. Why Question Answering using Sentiment Analysis and Word Classes. Proceedings of EMNLP-CoNLL 2012: Conference on Empirical Methods in Natural Language Processing and Natural Language Learning, Long paper, pp.368–378. 2012. 7. (pdf)

  15. Stijn De Saeger, Kentaro Torisawa, Masaaki Tsuchida, Jun’ichi Kazama, Chikara Hashimoto, Ichiro Yamada, Jong Hoon Oh, Istvan Varga and Yulan Yan. Relation Acquisition using Word Classes and Partial Patterns. Proceedings of EMNLP 2011: Conference on Empirical Methods in Natural Language Processing, Long paper, pp.825–835. 2011. 7. (pdf)

  16. Chikara Hashimoto, Kentaro Torisawa, Stijn De Saeger, Jun’ichi Kazama, and Sadao Kurohashi. Extracting Paraphrases from Definition Sentences on the Web. Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies (ACL/HLT 2011), Long paper, pp.1087–1097. 2011. 6. (pdf)

  17. Chikara Hashimoto, Kentaro Torisawa, Kow Kuroda, Masaki Murata, and Jun’ichi Kazama. Large-Scale Verb Entailment Acquisition from the Web. Proceedings of EMNLP 2009: Conference on Empirical Methods in Natural Language Processing, Long paper, pp.1172–1181. 2009. 8. (pdf)

  18. Chikara Hashimoto and Daisuke Kawahara. Construction of an Idiom Corpus and its Application to Idiom Identification based on WSD incorporating Idiom-Specific Features. Proceedings of EMNLP2008: Conference on Empirical Methods in Natural Language Processing, Long paper, pp.991–1000. 2008. 10. (pdf)

  19. Chikara Hashimoto and Sadao Kurohashi. Blog Categorization Exploiting Domain Dictionary and Dynamically Estimated Domains of Unknown Words. Proceedings of ACL HLT 2008, Short paper, pp.69– 72. 2008. 6. (pdf)

  20. Takaaki Tanaka, Francis Bond, Timothy Baldwin, Sanae Fujita and Chikara Hashimoto. Word Sense Disambiguation Incorporating Lexical and Structural Semantic Information. Proceedings of EMNLP-CoNLL 2007, Long paper, pp.477–485. 2007. 6. (pdf)

  21. Chikara Hashimoto and Sadao Kurohashi. Construction of Domain Dictionary for Fundamental Vocabulary. Proceedings of ACL 2007, Short paper, pp.137–140. 2007. 6. (pdf)

  22. Chikara Hashimoto, Satoshi Sato, and Takehito Utsuro. Japanese Idiom Recognition: Drawing a Line between Literal and Idiomatic Meanings. Proceedings of COLING/ACL 2006, Long paper, pp.353–360. 2006.7. (pdf)

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