Search Results for author: Ryohei Fujimaki

Found 13 papers, 1 papers with code

Unbiased Objective Estimation in Predictive Optimization

no code implementations ICML 2018 Shinji Ito, Akihiro Yabe, Ryohei Fujimaki

Predictive optimization, however, suffers from the problem of a calculated optimal solution’s being evaluated too optimistically, i. e., the value of the objective function is overestimated.

Decision Making

Scalable Model Selection for Belief Networks

no code implementations NeurIPS 2017 Zhao Song, Yusuke Muraoka, Ryohei Fujimaki, Lawrence Carin

We propose a scalable algorithm for model selection in sigmoid belief networks (SBNs), based on the factorized asymptotic Bayesian (FAB) framework.

Model Selection

Distributed Bayesian Piecewise Sparse Linear Models

no code implementations7 Nov 2017 Masato Asahara, Ryohei Fujimaki

The importance of interpretability of machine learning models has been increasing due to emerging enterprise predictive analytics, threat of data privacy, accountability of artificial intelligence in society, and so on.

Model Selection

An Interactive Greedy Approach to Group Sparsity in High Dimensions

1 code implementation10 Jul 2017 Wei Qian, Wending Li, Yasuhiro Sogawa, Ryohei Fujimaki, Xitong Yang, Ji Liu

Sparsity learning with known grouping structure has received considerable attention due to wide modern applications in high-dimensional data analysis.

Human Activity Recognition Vocal Bursts Intensity Prediction

On The Projection Operator to A Three-view Cardinality Constrained Set

no code implementations ICML 2017 Haichuan Yang, Shupeng Gui, Chuyang Ke, Daniel Stefankovic, Ryohei Fujimaki, Ji Liu

The cardinality constraint is an intrinsic way to restrict the solution structure in many domains, for example, sparse learning, feature selection, and compressed sensing.

feature selection Sparse Learning

Large-Scale Price Optimization via Network Flow

no code implementations NeurIPS 2016 Shinji Ito, Ryohei Fujimaki

On the basis of this connection, we propose an efficient algorithm that employs network flow algorithms.

Optimization Beyond Prediction: Prescriptive Price Optimization

no code implementations18 May 2016 Shinji Ito, Ryohei Fujimaki

This paper addresses a novel data science problem, prescriptive price optimization, which derives the optimal price strategy to maximize future profit/revenue on the basis of massive predictive formulas produced by machine learning.

Rebuilding Factorized Information Criterion: Asymptotically Accurate Marginal Likelihood

no code implementations22 Apr 2015 Kohei Hayashi, Shin-ichi Maeda, Ryohei Fujimaki

Our analysis provides a formal justification of FIC as a model selection criterion for LVMs and also a systematic procedure for pruning redundant latent variables that have been removed heuristically in previous studies.

Model Selection

Partition-wise Linear Models

no code implementations NeurIPS 2014 Hidekazu Oiwa, Ryohei Fujimaki

One of the key challenges in their use is non-convexity in simultaneous optimization of regions and region-specific models.

Forward-Backward Greedy Algorithms for General Convex Smooth Functions over A Cardinality Constraint

no code implementations31 Dec 2013 Ji Liu, Ryohei Fujimaki, Jieping Ye

Our new bounds are consistent with the bounds of a special case (least squares) and fills a previously existing theoretical gap for general convex smooth functions; 3) We show that the restricted strong convexity condition is satisfied if the number of independent samples is more than $\bar{k}\log d$ where $\bar{k}$ is the sparsity number and $d$ is the dimension of the variable; 4) We apply FoBa-gdt (with the conditional random field objective) to the sensor selection problem for human indoor activity recognition and our results show that FoBa-gdt outperforms other methods (including the ones based on forward greedy selection and L1-regularization).

Activity Recognition feature selection

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