Chikara Hashimoto


2019

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Weakly Supervised Multilingual Causality Extraction from Wikipedia
Chikara Hashimoto
Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP)

We present a method for extracting causality knowledge from Wikipedia, such as Protectionism -> Trade war, where the cause and effect entities correspond to Wikipedia articles. Such causality knowledge is easy to verify by reading corresponding Wikipedia articles, to translate to multiple languages through Wikidata, and to connect to knowledge bases derived from Wikipedia. Our method exploits Wikipedia article sections that describe causality and the redundancy stemming from the multilinguality of Wikipedia. Experiments showed that our method achieved precision and recall above 98% and 64%, respectively. In particular, it could extract causalities whose cause and effect were written distantly in a Wikipedia article. We have released the code and data for further research.

2016

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WISDOM X, DISAANA and D-SUMM: Large-scale NLP Systems for Analyzing Textual Big Data
Junta Mizuno | Masahiro Tanaka | Kiyonori Ohtake | Jong-Hoon Oh | Julien Kloetzer | Chikara Hashimoto | Kentaro Torisawa
Proceedings of COLING 2016, the 26th International Conference on Computational Linguistics: System Demonstrations

We demonstrate our large-scale NLP systems: WISDOM X, DISAANA, and D-SUMM. WISDOM X provides numerous possible answers including unpredictable ones to widely diverse natural language questions to provide deep insights about a broad range of issues. DISAANA and D-SUMM enable us to assess the damage caused by large-scale disasters in real time using Twitter as an information source.

2015

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Large-Scale Acquisition of Entailment Pattern Pairs by Exploiting Transitivity
Julien Kloetzer | Kentaro Torisawa | Chikara Hashimoto | Jong-Hoon Oh
Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing

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Intra-sentential Zero Anaphora Resolution using Subject Sharing Recognition
Ryu Iida | Kentaro Torisawa | Chikara Hashimoto | Jong-Hoon Oh | Julien Kloetzer
Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing

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Recognizing Complex Negation on Twitter
Junta Mizuno | Canasai Kruengkrai | Kiyonori Ohtake | Chikara Hashimoto | Kentaro Torisawa | Julien Kloetzer | Kentaro Inui
Proceedings of the 29th Pacific Asia Conference on Language, Information and Computation

2014

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Toward Future Scenario Generation: Extracting Event Causality Exploiting Semantic Relation, Context, and Association Features
Chikara Hashimoto | Kentaro Torisawa | Julien Kloetzer | Motoki Sano | István Varga | Jong-Hoon Oh | Yutaka Kidawara
Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)

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Million-scale Derivation of Semantic Relations from a Manually Constructed Predicate Taxonomy
Motoki Sano | Kentaro Torisawa | Julien Kloetzer | Chikara Hashimoto | István Varga | Jong-Hoon Oh
Proceedings of COLING 2014, the 25th International Conference on Computational Linguistics: Technical Papers

2013

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Two-Stage Method for Large-Scale Acquisition of Contradiction Pattern Pairs using Entailment
Julien Kloetzer | Stijn De Saeger | Kentaro Torisawa | Chikara Hashimoto | Jong-Hoon Oh | Motoki Sano | Kiyonori Ohtake
Proceedings of the 2013 Conference on Empirical Methods in Natural Language Processing

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WISDOM2013: A Large-scale Web Information Analysis System
Masahiro Tanaka | Stijn De Saeger | Kiyonori Ohtake | Chikara Hashimoto | Makoto Hijiya | Hideaki Fujii | Kentaro Torisawa
The Companion Volume of the Proceedings of IJCNLP 2013: System Demonstrations

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Aid is Out There: Looking for Help from Tweets during a Large Scale Disaster
István Varga | Motoki Sano | Kentaro Torisawa | Chikara Hashimoto | Kiyonori Ohtake | Takao Kawai | Jong-Hoon Oh | Stijn De Saeger
Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)

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Why-Question Answering using Intra- and Inter-Sentential Causal Relations
Jong-Hoon Oh | Kentaro Torisawa | Chikara Hashimoto | Motoki Sano | Stijn De Saeger | Kiyonori Ohtake
Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)

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Minimally Supervised Method for Multilingual Paraphrase Extraction from Definition Sentences on the Web
Yulan Yan | Chikara Hashimoto | Kentaro Torisawa | Takao Kawai | Jun’ichi Kazama | Stijn De Saeger
Proceedings of the 2013 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies

2012

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Why Question Answering using Sentiment Analysis and Word Classes
Jong-Hoon Oh | Kentaro Torisawa | Chikara Hashimoto | Takuya Kawada | Stijn De Saeger | Jun’ichi Kazama | Yiou Wang
Proceedings of the 2012 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning

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Excitatory or Inhibitory: A New Semantic Orientation Extracts Contradiction and Causality from the Web
Chikara Hashimoto | Kentaro Torisawa | Stijn De Saeger | Jong-Hoon Oh | Jun’ichi Kazama
Proceedings of the 2012 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning

2011

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Relation Acquisition using Word Classes and Partial Patterns
Stijn De Saeger | Kentaro Torisawa | Masaaki Tsuchida | Jun’ichi Kazama | Chikara Hashimoto | Ichiro Yamada | Jong Hoon Oh | Istvan Varga | Yulan Yan
Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing

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Extending WordNet with Hypernyms and Siblings Acquired from Wikipedia
Ichiro Yamada | Jong-Hoon Oh | Chikara Hashimoto | Kentaro Torisawa | Jun’ichi Kazama | Stijn De Saeger | Takuya Kawada
Proceedings of 5th International Joint Conference on Natural Language Processing

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Toward Finding Semantic Relations not Written in a Single Sentence: An Inference Method using Auto-Discovered Rules
Masaaki Tsuchida | Kentaro Torisawa | Stijn De Saeger | Jong-Hoon Oh | Jun’ichi Kazama | Chikara Hashimoto | Hayato Ohwada
Proceedings of 5th International Joint Conference on Natural Language Processing

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Extracting Paraphrases from Definition Sentences on the Web
Chikara Hashimoto | Kentaro Torisawa | Stijn De Saeger | Jun’ichi Kazama | Sadao Kurohashi
Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies

2009

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Large-Scale Verb Entailment Acquisition from the Web
Chikara Hashimoto | Kentaro Torisawa | Kow Kuroda | Stijn De Saeger | Masaki Murata | Jun’ichi Kazama
Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing

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Proceedings of the Workshop on Multiword Expressions: Identification, Interpretation, Disambiguation and Applications (MWE 2009)
Dimitra Anastasiou | Chikara Hashimoto | Preslav Nakov | Su Nam Kim
Proceedings of the Workshop on Multiword Expressions: Identification, Interpretation, Disambiguation and Applications (MWE 2009)

2008

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Blog Categorization Exploiting Domain Dictionary and Dynamically Estimated Domains of Unknown Words
Chikara Hashimoto | Sadao Kurohashi
Proceedings of ACL-08: HLT, Short Papers

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A Large-Scale Web Data Collection as a Natural Language Processing Infrastructure
Keiji Shinzato | Daisuke Kawahara | Chikara Hashimoto | Sadao Kurohashi
Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)

In recent years, language resources acquired from theWeb are released, and these data improve the performance of applications in several NLP tasks. Although the language resources based on the web page unit are useful in NLP tasks and applications such as knowledge acquisition, document retrieval and document summarization, such language resources are not released so far. In this paper, we propose a data format for results of web page processing, and a search engine infrastructure which makes it possible to share approximately 100 million Japanese web data. By obtaining the web data, NLP researchers are enabled to begin their own processing immediately without analyzing web pages by themselves.

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TSUBAKI: An Open Search Engine Infrastructure for Developing New Information Access Methodology
Keiji Shinzato | Tomohide Shibata | Daisuke Kawahara | Chikara Hashimoto | Sadao Kurohashi
Proceedings of the Third International Joint Conference on Natural Language Processing: Volume-I

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Construction of an Idiom Corpus and its Application to Idiom Identification based on WSD Incorporating Idiom-Specific Features
Chikara Hashimoto | Daisuke Kawahara
Proceedings of the 2008 Conference on Empirical Methods in Natural Language Processing

2007

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Construction of Domain Dictionary for Fundamental Vocabulary
Chikara Hashimoto | Sadao Kurohashi
Proceedings of the 45th Annual Meeting of the Association for Computational Linguistics Companion Volume Proceedings of the Demo and Poster Sessions

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Word Sense Disambiguation Incorporating Lexical and Structural Semantic Information
Takaaki Tanaka | Francis Bond | Timothy Baldwin | Sanae Fujita | Chikara Hashimoto
Proceedings of the 2007 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning (EMNLP-CoNLL)

2006

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Japanese Idiom Recognition: Drawing a Line between Literal and Idiomatic Meanings
Chikara Hashimoto | Satoshi Sato | Takehito Utsuro
Proceedings of the COLING/ACL 2006 Main Conference Poster Sessions

2005

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Integration of a Lexical Type Database with a Linguistically Interpreted Corpus
Chikara Hashimoto | Francis Bond | Takaaki Tanaka | Melanie Siegel
Proceedings of the Sixth International Workshop on Linguistically Interpreted Corpora (LINC-2005)

2004

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The Hinoki Treebank. Working Toward Text Understanding
Francis Bond | Sanae Fujita | Chikara Hashimoto | Kaname Kasahara | Shigeko Nariyama | Eric Nichols | Akira Ohtani | Takaaki Tanaka | Shigeaki Amano
Proceedings of the 5th International Workshop on Linguistically Interpreted Corpora