Hirotaka HACHIYA


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 classificationleast-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 selection1-regularizationsquared-loss mutual informationdensity-ratio estimationdimensionality 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 renderingstroke-based renderingreinforcement learningpolicy 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 learningmulti-task learningtransfer learningfactored state modelsMarkov 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 learningvalue function approximationleast-squares policy iterationoutlier1-loss functionlinear 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 estimationmultimodalityheteroscedastic noisedirect density ratio estimationtransition estimation
 Summary | Full Text:PDF