sugiyama_Director
Masashi Sugiyama (Ph.D.)
Title
Team Director
History
2001Assistant Professor, Department of Computer Science, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, Tokyo, Japan.
2003Associate Professor, Department of Computer Science, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, Tokyo, Japan.
2014Professor, Department of Complexity Science and Engineering, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan. (Present)
2016Director, RIKEN Center for Advanced Intelligence Project, Tokyo, Japan. (Present)

Members

  • Team director
    Masashi Sugiyama
    Masashi SugiyamaWEBSITE
  • Senior research scientist
    Gang Niu
    Gang NiuWEBSITE
  • Research scientist
    Takashi Ishida
    Takashi IshidaWEBSITE
  • Postdoctoral researcher
    Wei Wang
  • Postdoctoral researcher
    Zhen-yu Zhang
    Zhen-yu ZhangWEBSITE
  • Postdoctoral researcher
    Okan Koc
  • Postdoctoral researcher
    Ming-kun Xie
  • Postdoctoral researcher
    Xinqiang Cai
    Xinqiang CaiWEBSITE
  • Senior visiting scientist
    Shinichi Nakajima
  • Visiting scientist
    Florian Yger
  • Visiting scientist
    Miao Xu
  • Visiting scientist
    Bo Han
    Bo HanWEBSITE
  • Visiting scientist
    Motoya Ohnishi
  • Visiting scientist
    Nan Lu
  • Visiting scientist
    Feng Liu
  • Visiting scientist
    Jingfeng Zhang
  • Visiting scientist
    Tongliang Liu
  • Visiting scientist
    Yifan Zhang
  • Visiting scientist
    Shuo Chen
  • Visiting scientist
    Salah Ghamizi
  • Visiting scientist
    Tingting Zhao
  • Visiting scientist
    Peng Zhao
  • Visiting scientist
    Ximing Li
  • Student trainee
    Jerry Huang
  • Student trainee
    Yuhang Li
  • Student trainee
    Tanha Mai
  • Junior research associate
    Yuting Tang
  • Junior research associate
    Ryota Ushio
  • Junior research associate
    Dongdong Wu
  • Part-time worker I
    Johannes Ackermann
  • Part-time worker I
    Or Raveh
  • Part-time worker I
    Huanjian Zhou
  • Part-time worker I
    Zhiyuan Zhan
  • Part-time worker I
    Luheng Wang
  • Part-time worker II
    Ren Yin

Introduction

We develop novel algorithms that enable accurate learning from imperfect information across a wide range of machine learning paradigms, including supervised, unsupervised, and reinforcement learning, and investigate their theoretical properties. These methods have been broadly deployed in real-world applications, spanning fundamental science, business, and the construction of foundation models.

Main Research Field
Computer Science
Research Field
Engineering / Mathematics
Research Subjects
Development of machine learning algorithms from imperfect information
Theoretical analysis of machine learning algorithms
Real-world application of machine learning algorithms
RIKEN Website URL
https://www.riken.jp/en/research/labs/aip/math/imperfect_inf_learn/

Poster(s)

Research Achievements

List of Achievements

Related posts

posted on February 3, 2026 11:14Information
34 papers have been accepted at ICLR 2026
posted on December 9, 2025 09:19InformationAward
The 28th Workshop on Information-Based Induction Sciences (IBIS2025) Awards (November 12–15, 2025, Okinawa)
posted on November 14, 2025 13:05Information
Nine Papers Accepted to AAAI-26
posted on November 11, 2025 10:46Seminar
[102nd TrustML Young Scientist Seminar] Talk by Prof. Javen Qinfeng Shi (University of Adelaide) "Doing, Knowing, and Being: Reimagining Intelligence in Humans and Machines"
posted on October 14, 2025 10:28InformationInternal Events
[Event Report]"RIKEN AIP LLM×ML Workshop" (October 2–3, 2025, Tokyo)
posted on September 26, 2025 14:45Seminar
[101st TrustML Young Scientist Seminar] Talk by Prof. Yisen Wang (Peking University) "Toward a Theoretical Understanding of Self-Supervised Learning in the Foundation Model Era"
posted on September 26, 2025 14:53Information
46 papers were accepted at NeurIPS 2025
posted on September 18, 2025 00:55Seminar
[100th TrustML Young Scientist Seminar] Strategic Classification: Learning With Data That ‘Behaves’
posted on September 8, 2025 17:12Seminar
[99th TrustML Young Scientist Seminar] Talk by Jiang Wang (Nanjing University) "Heavy-tailed Linear Bandits: Huber Regression with One-Pass Update"
posted on September 1, 2025 15:43InformationAward
2025 ATML Fellow (August 28, 2025)
posted on August 26, 2025 10:01Seminar
[98th TrustML Young Scientist Seminar] Talk by Prof. Qiong Zhang (Renmin University of China) "Robust and Scalable Federated Learning of Finite Mixture Models: Addressing Label Switching and Byzantine Failures"
posted on August 3, 2025 08:23Seminar
Talk by Prof. Zhouchen Lin (PKU)
posted on July 16, 2025 17:57Information
2 papers were accepted at COLM 2025
posted on July 17, 2025 14:37Information
[In the Media] Japan Behind in AI-Driven Research(Kagaku Shimbun, June 13, 2025)
posted on June 12, 2025 17:58Information
"Ema Rie Dress Art Exhibition" (Tokyo, June 12– July 3, 2025)
posted on June 3, 2025 14:44Seminar
[97th TrustML Young Scientist Seminar] Talk by Bresson Xavier (National University of Singapore) "Graph Transformers for Molecular Science -- Overcoming Limitations in Graph Representation Learning"
posted on May 23, 2025 10:49Information
Three papers accepted at The Second Reinforcement Learning Conference (RLC) 2025
posted on May 12, 2025 10:41Information
Four papers have been accepted at COLT 2025
posted on May 12, 2025 10:25Information
One Tutorial and Three Papers Accepted at IJCAI 2025
posted on May 12, 2025 10:12Information
29 papers have been accepted at ICML 2025
posted on May 9, 2025 13:00Seminar
[95th TrustML Young Scientist Seminar] Talk by Max Zimmer (Technische Universität Berlin) "Towards Efficient Prune-Retrain Pipelines: Sparse Model Soups and Parameter-Efficient Retraining after Pruning"
posted on May 2, 2025 09:30Seminar
[93rd TrustML Young Scientist Seminar] Talk by Diganta Misra (Max Planck Institute) "LLMs vs. Torch 1.5: Why Your Code Assistant Can't Keep Up"
posted on April 24, 2025 13:59Information
【Event Report】A*STAR-CFAR & RIKEN AIP pre-ICLR Satellite Workshop (April 23, 2025)
posted on April 14, 2025 13:06Seminar
[91st TrustML Young Scientist Seminar] Talk by Yu-Hu Yan (Nanjing University) "Universal Online Learning with Gradient Variations"
posted on March 24, 2025 21:14Seminar
[90th TrustML Young Scientist Seminar] Talk by Benjamin Clavié (Answer.AI) "Denoising Objectives and Bidirectional Attention in 2025: Why Training a Modern Encoder Matters"
posted on March 24, 2025 19:01InformationAward
RIKEN Ohbu Award 2024
posted on March 24, 2025 18:38InformationAward
FY2024 RIKEN BAIHO Award
posted on March 26, 2025 18:46Information
【Event Report】2nd Vector Institute ＆ RIKEN AIP Joint Symposium on Machine Learning and Artificial Intelligence (Tront, Canada, March. 24-25, 2025)
posted on March 24, 2025 13:18Information
【Event Report】UW - RIKEN AIP Joint Workshop (Seattle, U.S, March. 20-21, 2025)
posted on February 3, 2025 09:09Seminar
[The 89th TrustML Young Scientist Seminar] Talk by Song Liu (University of Bristol) "High-Dimensional Differential Parameter Inference in Exponential Family using Time Score Matching"
posted on January 27, 2025 15:11Information
17 papers have been accepted at AISTATS 2025
posted on January 27, 2025 13:54Information
29 papers have been accepted at ICLR 2025
posted on January 6, 2025 12:57Seminar
[The 88th TrustML Young Scientist Seminar] Talk by Jiaqi Ma (University of Illinois Urbana-Champaign) "Practical Challenges and Recent Advances in Data Attribution"
posted on December 23, 2024 12:09Seminar
[The 87th TrustML Young Scientist Seminar] Talk by Sangwoong Yoon (Korea Institute for Advanced Study (KIAS)) "Sampling is Reinforcement Learning and Generative Modeling is Imitation Learning"
posted on December 17, 2024 16:33Information
Five papers were accepted at AAAI-25
posted on December 9, 2024 11:25Seminar
[The 85th TrustML Young Scientist Seminar] Talk by Yadan Luo (University of Queensland) "Reliable Model Predictions in the Open World Through the Lens of OOD Detection"
posted on November 7, 2024 10:10Seminar
[The 84th TrustML Young Scientist Seminar] Talk by Simo Hosio (University of Oulu) "Rethinking Data Origins: Crowdsourcing for Ethical and Human-Centric AI Solutions"
posted on October 9, 2024 23:11Information
[Event report: ECCV 2024 Workshop] The Dark Side of Generative AIs and Beyond（Sep. 29, 2024, MiCo Milano, Italy)
posted on October 2, 2024 17:33Information
41 papers were accepted at NeurIPS 2024
posted on September 30, 2024 11:21Information
8 papers have been accepted at EMNLP 2024
posted on November 19, 2024 10:15Information
【Repost】Addition of the Event Report: "Summer Camp for Female Undergraduate Students in Mathematical and Information Sciences" (Sep. 9-11, 2024, Tokyo)
posted on August 7, 2024 17:53Seminar
[The 83rd TrustML Young Scientist Seminar] Talk by Pang Wei Koh (University of Washington) "Reliable data use: Synthesis, retrieval, and interaction"
posted on July 9, 2024 10:48Information
Eight papers were accepted at ECCV 2024 (July 9, 2024)
posted on June 27, 2024 14:11Seminar
[AIP Seminar] Talk by Prof. Henry Lam (Columbia University, USA) on "Data-Optimization Integration: Statistical Challenges and Recent Developments"
posted on June 18, 2024 13:22Seminar
[ECCV 2024 Workshop] The Dark Side of Generative AIs and Beyond（Sep. 29, 2024, MiCo Milano, Italy)
posted on June 17, 2024 08:48Seminar
[Imperfect Information + Tensor Learning Team] Joint Seminar on LLM Research
posted on May 28, 2024 21:18Seminar
[The 82nd TrustML Young Scientist Seminar] Talk by James Enouen (University of Southern California) "Feature Interaction Selection (FIS) and its Applications in Structure Learning, Robust Generalization, and Interpretability"
posted on May 17, 2024 15:06Seminar
[The 81st TrustML Young Scientist Seminar] Talk by Sayak Ray Chowdhury (Microsoft Research, India) "Provably Robust DPO: Aligning Language Models with Noisy Feedback"
posted on May 15, 2024 15:02Seminar
[The 80th TrustML Young Scientist Seminar] Talk by Sinho Chewi (Institute for Advanced Study) "Variational inference via Wasserstein gradient flows"
posted on May 9, 2024 22:55Information
37 papers have been accepted at ICML 2024
posted on April 30, 2024 18:24Information
Two papers have been accepted at IJCAI 2024
posted on April 4, 2024 18:08InterviewInformation
【Publish】"What will AI Generation Learn: Messages from Female Researchers"(March 28, 2024)
posted on March 26, 2024 16:17InformationAward
RIKEN Ohbu Award 2023
posted on February 14, 2024 11:56Seminar
[The 78th TrustML Young Scientist Seminar] Talk by Dheeraj Baby (UC Santa Barbara)
posted on January 29, 2024 09:39Information
7 papers have been accepted at AISTATS 2024
posted on January 23, 2024 17:40Information
19 papers have been accepted at ICLR 2024
posted on December 22, 2023 16:11InformationPressrelease
Computational Design of Synthetic Optical Barcodes in Microdroplets (December 22, 2024, Advanced Optical Materials)
posted on December 15, 2023 10:39Information
11 papers were accepted at AAAI-24
posted on November 28, 2023 14:37Seminar
[The 77th TrustML Young Scientist Seminar] Talk by Prof. Ruohan Zhan (Hong Kong University of Science and Technology)
posted on November 27, 2023 17:11Information
【Event Report】International Workshop on Weakly Supervised Learning 2023(Tokyo, November 23-24, 2023)
posted on October 18, 2023 14:32Seminar
[Hybrid] International Workshop on Weakly Supervised Learning 2023
posted on October 4, 2023 14:01Seminar
[The 75th TrustML Young Scientist Seminar] Talk by Prof. Bo An (Nanyang Technological University)
posted on October 4, 2023 14:33Seminar
[The 74th TrustML Young Scientist Seminar] Talk by Chris Reinke (Inria Grenoble)
posted on September 29, 2023 16:37Information
【Event Report】RIKEN AIP and NCU Joint Workshop on Mathematical Foundations of Machine Learning (Poland, Sep. 26, 2023)
posted on September 25, 2023 20:05Information
35 papers were accepted at NeurIPS 2023
posted on September 5, 2023 21:33Seminar
[The 73rd TrustML Young Scientist Seminar]
posted on July 21, 2023 09:36Information
7 papers have been accepted at ICCV 2023
posted on July 19, 2023 09:26Seminar
[The 71st TrustML Young Scientist Seminar]
posted on June 8, 2023 15:37Seminar
[The 70th TrustML Young Scientist Seminar]
posted on April 7, 2023 17:26Information
FY2022 RIKEN BAIHO Award
posted on May 23, 2023 07:32InformationAward
FY2022 FUNAI Informatin Technology Award for Young Researchers
posted on May 15, 2023 18:02Seminar
[The 69th TrustML Young Scientist Seminar]
posted on May 2, 2023 09:42Information
23 papers have been accepted at ICML 2023
posted on April 17, 2023 21:01Seminar
[The 68th TrustML Young Scientist Seminar]
posted on April 6, 2023 11:26Seminar
[The 67th TrustML Young Scientist Seminar]
posted on March 30, 2023 12:29Seminar
[The 66th TrustML Young Scientist Seminar]
posted on March 21, 2023 17:49Seminar
[The 62nd TrustML Young Scientist Seminar]
posted on March 21, 2023 17:49Seminar
[The 63rd TrustML Young Scientist Seminar]
posted on March 21, 2023 17:49Seminar
[The 64th TrustML Young Scientist Seminar]
posted on March 24, 2023 12:01Seminar
[The 65th TrustML Young Scientist Seminar]
posted on March 17, 2023 09:55Seminar
[The 61st TrustML Young Scientist Seminar]
posted on March 13, 2023 10:01Seminar
[The 60th TrustML Young Scientist Seminar]
posted on March 8, 2023 13:41Information
Paper was accepted at CVPR 2023
posted on March 1, 2023 21:41Seminar
[The 59th TrustML Young Scientist Seminar]
posted on February 27, 2023 17:28Seminar
[The 58th TrustML Young Scientist Seminar]
posted on February 9, 2023 22:07Seminar
[The 56th TrustML Young Scientist Seminar]
posted on February 9, 2023 22:08Seminar
[The 57th TrustML Young Scientist Seminar]
posted on February 9, 2023 09:13Seminar
[The 55th TrustML Young Scientist Seminar]
posted on January 26, 2023 13:45Seminar
[The 52nd TrustML Young Scientist Seminar]
posted on January 26, 2023 13:45Seminar
[The 53rd TrustML Young Scientist Seminar]
posted on January 26, 2023 13:46Seminar
[The 54th TrustML Young Scientist Seminar]
posted on January 27, 2023 20:39Information
7 papers have been accepted at ICLR 2023
posted on January 24, 2023 22:45Seminar
[The 51st TrustML Young Scientist Seminar]
posted on January 19, 2023 17:22Seminar
[The 50th TrustML Young Scientist Seminar]
posted on January 11, 2023 10:47Seminar
[The 49th TrustML Young Scientist Seminar]
posted on December 28, 2022 10:27Seminar
Imperfect Information Learning Team(Talk by Wan Seng)
posted on December 22, 2022 18:58Seminar
[The 47th TrustML Young Scientist Seminar]
posted on December 22, 2022 18:59Seminar
[The 48th TrustML Young Scientist Seminar]
posted on December 13, 2022 23:52Seminar
[The 46th TrustML Young Scientist Seminar]
posted on December 9, 2022 20:13Seminar
[The 45th TrustML Young Scientist Seminar]
posted on November 29, 2022 10:17Seminar
[The 43rd TrustML Young Scientist Seminar]
posted on December 5, 2022 16:03Seminar
[The 44th TrustML Young Scientist Seminar]
posted on November 17, 2022 16:39Seminar
[The 42nd TrustML Young Scientist Seminar]
posted on November 15, 2022 10:08Information
MIRAI2.0 Researchers Visits RIKEN AIP
posted on November 11, 2022 13:18Seminar
[The 41st TrustML Young Scientist Seminar]
posted on October 27, 2022 10:49Seminar
[The 40th TrustML Young Scientist Seminar]
posted on October 25, 2022 14:52Seminar
[The 37th TrustML Young Scientist Seminar]
posted on October 26, 2022 14:13Seminar
[The 38th TrustML Young Scientist Seminar]
posted on October 26, 2022 14:57Seminar
[The 39th TrustML Young Scientist Seminar]
posted on October 13, 2022 18:41Seminar
[The 35th TrustML Young Scientist Seminar]
posted on October 3, 2022 09:05Seminar
[The 34th TrustML Young Scientist Seminar]
posted on September 27, 2022 19:29Information
23 papers were accepted at NeurIPS 2022
posted on September 3, 2022 09:27Seminar
[The 31st TrustML Young Scientist Seminar]
posted on August 17, 2022 11:57Seminar
[The 27th TrustML Young Scientist Seminar]
posted on August 2, 2022 13:41Seminar
[The 25th TrustML Young Scientist Seminar]
posted on June 21, 2022 12:45Seminar
[The 20th TrustML Young Scientist Seminar]
posted on June 13, 2022 10:08Seminar
[The 18th TrustML Young Scientist Seminar]
posted on June 13, 2022 10:08Seminar
[The 19th TrustML Young Scientist Seminar]
posted on June 10, 2022 18:44Seminar
12th RIKEN Innovation Seminar
posted on May 30, 2022 12:25Seminar
[The 17th TrustML Young Scientist Seminar]
posted on May 23, 2022 10:51Information
11 papers have been accepted at ICML 2022
posted on May 19, 2022 16:27Seminar
[The 15th TrustML Young Scientist Seminar]
posted on May 4, 2022 10:40Seminar
[The 14th TrustML Young Scientist Seminar]
posted on April 28, 2022 11:56Seminar
[The 13th TrustML Young Scientist Seminar]
posted on April 25, 2022 15:23Information
Four Papers have been accepted at IJCAI 2022
posted on April 22, 2022 17:47InformationAward
Outstanding Paper Honorable Mention at ICLR 2022 　
posted on April 8, 2022 16:13InformationAward
FY2022 MEXT Science and Technology Award
posted on April 4, 2022 16:13InformationAward
RIKEN Ohbu Award 2021
posted on April 8, 2022 14:02InformationAward
FY2021 RIKEN BAIHO Award
posted on March 9, 2022 15:20Seminar
[The 7th TrustML Young Scientist Seminar]
posted on March 9, 2022 15:22Seminar
[The 8th TrustML Young Scientist Seminar]
posted on March 7, 2022 16:39Information
Nine papers were accepted at CVPR 2022
posted on February 23, 2022 18:20Seminar
[The 6th TrustML Young Scientist Seminar] Talk by Kfir Y. Levy (Technion)
posted on February 18, 2022 10:39Seminar
Imperfect Information Learning Team Seminar (Talk by Yu Shao, Nanjing University of Science and Technology).
posted on February 18, 2022 19:05InformationAward
FY2021 38th Inoue Research Award for Young Scientists
posted on February 3, 2022 15:41Seminar
[The 3rd TrustML Young Scientist Seminar]
posted on February 8, 2022 11:35Seminar
[The 5th TrustML Young Scientist Seminar]
posted on February 8, 2022 11:41Seminar
[The 4th TrustML Young Scientist Seminar]
posted on January 30, 2022 21:18Seminar
[The 2nd TrustML Young Scientist Seminar]
posted on January 26, 2022 19:35Information
12 papers have been accepted at ICLR 2022
posted on January 25, 2022 14:15Seminar
[The 1st TrustML Young Scientist Seminar]
posted on January 24, 2022 08:52Information
7 papers have been accepted at AISTATS 2022
posted on December 21, 2021 21:28InformationPressrelease
In silico-labeled ghost cytometry
posted on October 8, 2021 16:33Information
17 papers were accepted at NeurIPS 2021
posted on August 30, 2021 08:00Information
Seven papers have been accepted at EMNLP2021
posted on July 26, 2021 10:45Information
【In the media】Confidence Scores Make Instance-dependent Label-noise Learning Possible（Nikkan Kogyo Shimbun, July 22, 2021)
posted on May 21, 2021 15:49Information
26 papers have been accepted at ICML 2021
posted on April 26, 2021 17:14Seminar
Imperfect Information Learning Team Seminar (Talk by Jiaqi Lv, Southeast University)
posted on April 14, 2021 17:03Information
ABCpy, a machine learning library, has used γ-ABC proposed in a research paper mainly by Masahiro Fujisawa, a team member of the Imperfect Information Learning Team (PI: Masashi Sugiyama)
posted on March 24, 2021 14:11Award
Three researchers received RIKEN Ohbu Award 2020
posted on March 9, 2021 16:01Information
Papers were accepted at CVPR 2021
posted on January 29, 2021 13:48Information
17 papers were accepted at AISTATS 2021
posted on January 26, 2021 15:17Information
Nine papers were accepted at ICLR 2021
posted on January 27, 2021 11:12Information
Five papers were accepted at AAAI-21
posted on November 2, 2020 15:09Seminar
[7th AIP Open Seminar] Talks by Imperfect Information Learning Team
posted on October 2, 2020 09:00Information
21 papers were accepted at NeurIPS 2020
posted on June 22, 2020 16:28Award
Five researchers received RIKEN Ohbu Award 2019
posted on July 16, 2020 15:15Information
Eighteen papers were accepted at ICML 2020
posted on May 28, 2020 15:00Information
Papers were accepted at IJCAI-PRICAI 2020
posted on March 30, 2020 13:00Award
Visiting Scientist Bo Han received the 2019 RIKEN BAIHO Award
posted on March 13, 2020 11:25Information
Ten papers were accepted at AISTATS 2020
posted on December 5, 2019 09:30Information
Fourteen papers were accepted at AAAI-20
posted on November 15, 2019 14:00Information
Director Sugiyama, Team Leader Khan and Unit Leader Maehara have took part in The Fields CQAM Focus Program as co-organizers
posted on November 14, 2019 10:44Information
Our three researchers gave presentations at CAS-RIKEN Young Scientists Seminar
posted on September 11, 2019 12:00Information
21 papers were accepted at NeurIPS 2019
posted on August 8, 2019 10:45Information
Papers have been accepted at IJCAI-19
posted on June 27, 2019 14:33Information
Director Sugiyama gave an invited lecture at AI Summer School in Turkey
posted on June 13, 2019 09:10Award
Research Scientist Gang Niu received the 2018 RIKEN BAIHO Award
posted on May 16, 2019 13:52Information
Fourteen papers have been accepted at ICML 2019
posted on December 3, 2018 10:36Award
Mr. Chen Si-An, National Taiwan University received master's thesis prize, Taiwanese Association for Artificial Intelligence
posted on November 26, 2018 14:01Pressrelease
Smarter AI: machine learning without negative data
posted on November 16, 2018 17:18Information
Thirteen papers have been accepted at AAAI-19
posted on November 7, 2018 11:50Award
Our members, Futoshi Futami, Takashi Ishida and others received IEICE TC-IBISML Research Award
posted on September 7, 2018 17:55Information
Twelve papers are accepted at NeurIPS 2018
posted on April 27, 2018 09:17Award
Han Bao of the University of Tokyo graduate student received AIP Network Lab Award
posted on March 30, 2018 14:44Award
Center Director Masashi Sugiyama received FY 2017 Fellow award from Institute of Electronics, Information and Communication Engineers
posted on March 22, 2018 10:08Award
Received RIKEN Research Incentive Award 2017: Research Scientist Wataru Kumagai, Visiting Scientist Gang Niu