What's New

The following paper was accepted to AAAI 2022

  • Hirokazu Kiyomaru and Sadao Kurohashi:
    Minimally-Supervised Joint Learning of Event Volitionality and Subject Animacy Classification

We went on a hike to Manshuin. (2021/11/17)


The following paper was accepted to EMNLP2021 Findings

  • Masato Umakoshi, Yugo Murawaki and Sadao Kurohashi:
    Japanese Zero Anaphora Resolution Can Benefit from Parallel Texts Through Neural Transfer Learning

Dr. Okahisa joined our lab as a researcher. (2021/8/1)

Project Researcher Ribeka Tanaka moved to Ochanomizu University as a Project Lecturer. (2021/7/1)

We will present the follwing papers at ACL-IJCNLP 2021 Student Research Workshop. (2021/8/1-6)

  • Weiqi Gu, Haiyue Song, Chenhui Chu and Sadao Kurohashi:
    Video-guided Machine Translation with Spatial Hierarchical Attention Network
  • Jules Samaran, Noa Garcia, Mayu Otani, Chenhui Chu and Yuta Nakashima:
    Attending Self-Attention: A Case Study of Visually Grounded Supervision in Vision-and-Language Transformers

We will present the follwing papers at ACL2021. (2021/8/1-6)

  • Zhuoyuan Mao, Prakhar Gupta, Chenhui Chu, Martin Jaggi, Sadao Kurohashi:
    Lightweight Cross-Lingual Sentence Representation Learning

We built a website that aggregates information about COVID-19 from around the world. (6/2)


Research Overview

Language is the most reliable medium of human intellectual activities. Our objective is to establish the technology and academic discipline for handling and understanding language, in a manner that is as close as possible to that of humans, using computers. These include syntactic language analysis, semantic analysis, context analysis, text comprehension, text generation and dictionary systems to develop various application systems for machine translation and information retrieval.

Search Engine Infrastructure based on Deep Natural Language Processing


The essential purpose of information retrieval is not to retrieve just a relevant document but to acquire the information or knowledge in the document. We have been developing a next-generation infrastructure of information retrieval on the basis of the following techniques of deep natural language processing: precise processing based not on words but on predicate-argument structures, identifying the variety of linguistic expressions and providing a bird's-eye view of search results via clustering and interaction.

Machine Translation


To bring automatic translation by computers to the level of human translation, we have been studying next-generation methodology of machine translation on the basis of text understanding and a large collection of translation examples. We have already accomplished practical translation on the domain of travel conversation, and constructed a translation-aid system that can be used by experts of patent translation.

Fundamental Studies on Text Understanding

To make computers understand language, it is essential to give computers world knowledge. This was a very hard problem ten years ago, but it has become possible to acquire knowledge from a massive amount of text in virtue of the drastic progress of computing power and network. We have successfully acquired linguistic patterns of predicate-argument structures from automatic parses of 7 billion Japanese sentences crawled from the Web using grid computing machines. By utilizing such knowledge, we study text understanding, i.e., recognizing the relationships between words and phrases in text.

Policy Regarding Acceptance of Students from Outside

Master course

PhD course