Search Results for author: Ryoya Yamasaki

Found 7 papers, 1 papers with code

Remarks on Loss Function of Threshold Method for Ordinal Regression Problem

no code implementations22 May 2024 Ryoya Yamasaki, Toshiyuki Tanaka

Threshold methods are popular for ordinal regression problems, which are classification problems for data with a natural ordinal relation.

Parallel Algorithm for Optimal Threshold Labeling of Ordinal Regression Methods

1 code implementation21 May 2024 Ryoya Yamasaki, Toshiyuki Tanaka

For $K$-class OR tasks, threshold methods learn a one-dimensional transformation (1DT) of the explanatory variable so that 1DT values for observations of the explanatory variable preserve the order of label values $1,\ldots, K$ for corresponding observations of the target variable well, and then assign a label prediction to the learned 1DT through threshold labeling, namely, according to the rank of an interval to which the 1DT belongs among intervals on the real line separated by $(K-1)$ threshold parameters.

regression

Convergence Analysis of Blurring Mean Shift

no code implementations23 Feb 2024 Ryoya Yamasaki, Toshiyuki Tanaka

Blurring mean shift (BMS) algorithm, a variant of the mean shift algorithm, is a kernel-based iterative method for data clustering, where data points are clustered according to their convergent points via iterative blurring.

Label Smoothing is Robustification against Model Misspecification

no code implementations15 May 2023 Ryoya Yamasaki, Toshiyuki Tanaka

For example, in binary classification, instead of the one-hot target $(1, 0)^\top$ used in conventional logistic regression (LR), LR with LS (LSLR) uses the smoothed target $(1-\frac{\alpha}{2},\frac{\alpha}{2})^\top$ with a smoothing level $\alpha\in(0, 1)$, which causes squeezing of values of the logit.

Binary Classification

Convergence Analysis of Mean Shift

no code implementations15 May 2023 Ryoya Yamasaki, Toshiyuki Tanaka

The mean shift (MS) algorithm seeks a mode of the kernel density estimate (KDE).

Optimal Kernel for Kernel-Based Modal Statistical Methods

no code implementations20 Apr 2023 Ryoya Yamasaki, Toshiyuki Tanaka

Kernel-based modal statistical methods include mode estimation, regression, and clustering.

Clustering regression

Kernel Selection for Modal Linear Regression: Optimal Kernel and IRLS Algorithm

no code implementations30 Jan 2020 Ryoya Yamasaki, Toshiyuki Tanaka

Modal linear regression (MLR) is a method for obtaining a conditional mode predictor as a linear model.

regression

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