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IEICE Trans

Hirotaka HACHIYA

A Transformer-Based Fully Trainable Point Process
Hirotaka HACHIYA Fumiya NISHIZAWA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2025/06/01
Vol. E108-D  No. 6  pp. 583-592
Type of Manuscript:  PAPER
Category: Artificial Intelligence, Data Mining
Keyword: 
point process, Transformer, event prediction, Hawkes process, 
 Summary | Full Text:PDF
Computationally Efficient Multi-Label Classification by Least-Squares Probabilistic Classifiers
Hyunha NAM Hirotaka HACHIYA Masashi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2013/08/01
Vol. E96-D  No. 8  pp. 1871-1874
Type of Manuscript:  LETTER
Category: Fundamentals of Information Systems
Keyword: 
multi-label classification, least-squares probabilistic classifier, 
 Summary | Full Text:PDF
Feature Selection via 1-Penalized Squared-Loss Mutual Information
Wittawat JITKRITTUM Hirotaka HACHIYA Masashi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2013/07/01
Vol. E96-D  No. 7  pp. 1513-1524
Type of Manuscript:  PAPER
Category: Pattern Recognition
Keyword: 
feature selection, 1-regularization, squared-loss mutual information, density-ratio estimation, dimensionality reduction, 
 Summary | Full Text:PDF
Artist Agent: A Reinforcement Learning Approach to Automatic Stroke Generation in Oriental Ink Painting
Ning XIE Hirotaka HACHIYA Masashi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2013/05/01
Vol. E96-D  No. 5  pp. 1134-1144
Type of Manuscript:  PAPER
Category: Artificial Intelligence, Data Mining
Keyword: 
painterly rendering, stroke-based rendering, reinforcement learning, policy gradient, 
 Summary | Full Text:PDF
Multi-Task Approach to Reinforcement Learning for Factored-State Markov Decision Problems
Jaak SIMM Masashi SUGIYAMA Hirotaka HACHIYA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2012/10/01
Vol. E95-D  No. 10  pp. 2426-2437
Type of Manuscript:  PAPER
Category: Artificial Intelligence, Data Mining
Keyword: 
reinforcement learning, multi-task learning, transfer learning, factored state models, Markov decision process, 
 Summary | Full Text:PDF
Least Absolute Policy Iteration--A Robust Approach to Value Function Approximation
Masashi SUGIYAMA Hirotaka HACHIYA Hisashi KASHIMA Tetsuro MORIMURA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2010/09/01
Vol. E93-D  No. 9  pp. 2555-2565
Type of Manuscript:  PAPER
Category: Artificial Intelligence, Data Mining
Keyword: 
reinforcement learning, value function approximation, least-squares policy iteration, outlier, 1-loss function, linear programming, 
 Summary | Full Text:PDF
Least-Squares Conditional Density Estimation
Masashi SUGIYAMA Ichiro TAKEUCHI Taiji SUZUKI Takafumi KANAMORI Hirotaka HACHIYA Daisuke OKANOHARA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2010/03/01
Vol. E93-D  No. 3  pp. 583-594
Type of Manuscript:  PAPER
Category: Pattern Recognition
Keyword: 
conditional density estimation, multimodality, heteroscedastic noise, direct density ratio estimation, transition estimation, 
 Summary | Full Text:PDF