I am Atsumoto Ohashi, a Ph.D. candidate in Informatics at Nagoya University, with a primary research focus on dialogue systems. My work has centered on optimizing task-oriented dialogue systems through the integration of NLP and reinforcement learning (RL) techniques. Recently, my research interests have expanded to spoken language models and full-duplex spoken dialogue systems for real-time and more natural conversational experiences.

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

Research Experience

• September 2025 – Present
  Kyutai, Paris, France
  Visiting PhD Student

• June 2025 – September 2025
  National Institute of Informatics (NII), Remote
  Research Assistant
  Project: Development of spoken dialogue models at LLM-jp project

• August 2023 – September 2023
  CyberAgent, Inc., Tokyo, Japan
  Research Intern
  Project: Analyzing minimum bayes risk (MBR) decoding for neural machine translation models

Selected Publications

(* Equal contribution)

International Conferences (Refereed)

• Atsumoto Ohashi, Shinya Iizuka, Jingjing Jiang, and Ryuichiro Higashinaka.
  “Towards a Japanese Full-duplex Spoken Dialogue System”
  The 26th Interspeech Conference (INTERSPEECH 2025)
  [Paper] [Website] [Code]

• Atsumoto Ohashi and Ryuichiro Higashinaka.
  “Universal Post-Processing Networks for Joint Optimization of Modules in Task-Oriented Dialogue Systems”
  The 39th Annual AAAI Conference on Artificial Intelligence (AAAI 2025)
  [Paper] [Code]

• 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, and 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]

• 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)]

Honors and Awards

• Committee Special Award (32/726)
  The 31st Annual Meeting of the Association of Natural Language Processing (NLP), 2025
• 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

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

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