I’m currently a PhD student at Nagoya University. I’m working within the Dialogue System Research Group, under the guidance of Prof. Ryuichiro Higashinaka. My research interests lie in task-oriented dialogue systems, reinforcement learning, and natural language processing.

My CV can be found here (PDF).

Education

• April 2023 – Present
  Ph.D. student in Informatics
  Graduate School of Informatics, Nagoya University

• April 2021 – March 2023
  Master of Informatics
  Graduate School of Informatics, Nagoya University

• April 2017 – March 2021
  Bachelor of Informatics
  School of Informatics, Nagoya University

Selected Publications

(* Equal contribution)

International Conferences (Refereed)

• Atsumoto Ohashi, Ukyo Honda, Tetsuro Morimura and Yuu Jinnai.
  “On the True Distribution Approximation of Minimum Bayes-Risk Decoding”
  The 2024 Annual Conference of the North American Chapter of the Association for Computational Linguistics (NAACL 2024)
  [Paper] [Code]

• Atsumoto Ohashi*, Ryu Hirai*, Shinya Iizuka, Ryuichiro Higashinaka.
  “JMultiWOZ: A Large-Scale Japanese Multi-Domain Task-Oriented Dialogue Dataset”
  The 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024)
  [Paper] [Code]

• Atsumoto Ohashi and Ryuichiro Higashinaka.
  “Enhancing Task-oriented Dialogue Systems with Generative Post-processing Networks”
  The 2023 Conference on Empirical Methods in Natural Language Processing (EMNLP 2023)
  [Paper] [Code]

• Ao Guo, Atsumoto Ohashi, Yuya Chiba, Yuiko Tsunomori, Ryu Hirai and Ryuichiro Higashinaka.
  “Personality-aware Natural Language Generation for Task-oriented Dialogue using Reinforcement Learning”
  The 32nd IEEE International Conference on Robot and Human Interactive Communication (RO-MAN 2023)
  [Paper]

• Atsumoto Ohashi and Ryuichiro Higashinaka.
  “Adaptive Natural Language Generation for Task-oriented Dialogue via Reinforcement Learning”
  The 29th International Conference on Computational Linguistics (COLING 2022)
  [Paper] [Code] [Blog (in Japanese)]

• Atsumoto Ohashi and Ryuichiro Higashinaka.
  “Post-processing Networks: A Method for Optimizing Pipeline Task-oriented Dialogue Systems using Reinforcement Learning”
  The 23rd Annual Meeting of the Special Interest Group on Discourse and Dialogue (SIGDIAL 2022)
  [Paper] [Code] [Blog (in Japanese)]

• Ao Guo, Atsumoto Ohashi, Ryu Hirai, Yuya Chiba, Yuiko Tsunomori and Ryuichiro Higashinaka.
  “Influence of user personality on dialogue task performance: A case study using a rule-based dialogue system”
  The 3rd Workshop on Natural Language Processing for Conversational AI (NLP4ConvAI 2021)
  [Paper]

Non-refereed

• 大橋厚元*, 平井龍*, 飯塚慎也, 東中竜一郎.
  “JMultiWOZに対する対話状態アノテーションの付与と対話システムの実装評価”
  言語処理学会 第30回年次大会 (NLP2024)
  [Paper]

• 大橋厚元*, 平井龍*, 飯塚慎也, 東中竜一郎.
  “JMultiWOZ: 日本語タスク指向型対話データセットの構築”
  言語処理学会 第29回年次大会 (NLP2023)
  [Paper] [若手奨励賞]

• Ryu Hirai*, Atsumoto Ohashi*, Ao Guo, Hideki Shiroma, Xulin Zhou, Yukihiko Tone, Shinya Iizuka, Ryuichiro Higashinaka.
  “Team Flow at DRC2022: Pipeline System for Travel Destination Recommendation Task in Spoken Dialogue” Dialogue Robot Competition 2022 (DRC 2022)
  [Paper]

• 大橋厚元, 東中竜一郎.
  “後処理ネットワークを用いた強化学習によるタスク指向型対話システムの最適化”
  言語処理学会 第28回年次大会 (NLP2022)
  [Paper] [スポンサー賞（サイバーエージェント賞）, 委員特別賞]

• 大橋厚元, 東中竜一郎.
  “強化学習を用いたモジュール連動に基づくタスク指向型対話システムの検討”
  2021年度 人工知能学会全国大会 (JSAI 2021)
  [Paper]

Honors and Awards

• Young Researcher Encouragement Award (18/406)
  The 29th Annual Meeting of the Association of Natural Language Processing (NLP), 2023
• Sponsorship Award (5/386)
  The 28th Annual Meeting of the Association of Natural Language Processing (NLP), 2022
• Committee Special Award (16/365)
  The 28th Annual Meeting of the Association of Natural Language Processing (NLP), 2022
• Outstanding Academic Achievement
  Department of Computer Science, Nagoya University, 2018
• Chinese Speech Contest 4th prize
  Nanjing University Cup, 2017

Invited Talks

• Minimum Bayes-Risk Decodingにおける性能変動の理解に向けて
  第59回 NLPコロキウム, 2024
  [Link] [Slide]

• 国際会議参加報告 EMNLP 2023
  第99回 人工知能学会 言語・音声理解と対話処理研究会 (SLUD) 「第14回対話システムシンポジウム」, 2023
  [Link] [Slide]

• 国際会議参加報告 SIGDIAL2022/YRRSDS2022
  第96回 人工知能学会 言語・音声理解と対話処理研究会 (SLUD) 「第13回対話システムシンポジウム」, 2022
  [Link] [Slide]

Scholarships and Grants

• JSPS Research Fellowship for Young Scientists (DC2) [Link]
  April 2025 – March 2027
  
  • Research scholarship: 200,000 yen / month
  • Research Expenses: 800,000 yen / year
• Nagoya University Interdisciplinary Frontier Fellowship [Link]
  April 2023 – March 2026
  
  • Research scholarship: 180,000 yen / month
  • Research Expenses: 250,000 yen / year

Experience

• Workshop Organizer for YRRSDS 2024
  June 2024 – September 2024

• Research Intern at CyberAgent, Inc.
  August 2023 – September 2023

• Teaching Assistant for Intelligent Interface 2, Nagoya University
  June 2022 – August 2022

• Short-term Study Abroad at Nanjing University, China
  February 2018 – March 2018