What's New

We will present the following papers at COLING2020 (2020/12/8-13)

  • Raj Dabre, Chenhui Chu, Anoop Kunchukuttan:
    Multilingual Neural Machine Translation (Tutorial)
  • Nobuhiro Ueda, Daisuke Kawahara and Sadao Kurohashi:
    BERT-based Cohesion Analysis of Japanese Texts
  • Oleksandr Harust, Yugo Murawaki and Sadao Kurohashi:
    Native-like Expression Identification by Contrasting Native and Proficient Second Language Speakers

The following papers are accepted by EMNLP2020 Findings

  • Fei Cheng, Masayuki Asahara, Ichiro Kobayashi and Sadao Kurohashi:
    Dynamically Updating Event Representations for Temporal Relation Classification with Multi-category Learning
  • Haoran Zhang, Qianying Liu, Aysa Xuemo Fan, Heng Ji, Daojian Zeng, Fei Cheng, Daisuke Kawahara and Sadao Kurohashi:
    Minimize Exposure Bias of Seq2Seq Models in Joint Entity and Relation Extraction

We will present the following papers at EMNLP2020 (2020/11/8-12)

  • Kazumasa Omura, Daisuke Kawahara and Sadao Kurohashi:
    A Method for Building a Commonsense Inference Dataset based on Basic Events
  • Yugo Murawaki:
    Latent Geographical Factors for Analyzing the Evolution of Dialects in Contact

The following paper received the Young Researcher award of the 244-th meeting of IPSJ Natural Language Processing(link in Japanese) (2020/7)

  • Takumi Yoshikoshi, Daisuke Kawahara and Sadao Kurohashi:
    Multilingualization of a Natural Language Inference Dataset Using Machine Translation

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.