نتایج جستجو برای: random undersampling
تعداد نتایج: 284925 فیلتر نتایج به سال:
For class imbalance problem, the integration of sampling and ensemble methods has shown great success among various methods. Nevertheless, as the representatives of sampling methods, undersampling and oversampling cannot outperform each other. That is, undersampling fits some data sets while oversampling fits some other. Besides, the sampling rate also significantly influences the performance o...
An approach to Magnetic Resonance (MR) image reconstruction from undersampled data is proposed. Undersampling artifacts are removed using an iterative thresholding algorithm applied to nonlinearly transformed image block arrays. Each block array is transformed using kernel principal component analysis where the contribution of each image block to the transform depends in a nonlinear fashion on ...
The area under a ROC curve (AUC) and partial area under a ROC curve (pAUC) are important summary measures useful in assessing the accuracy of a diagnostic test or a biomarker in discriminating true disease status. We consider nonparametric estimation of AUC and pAUC under a test-result-dependent sampling (TDS) design, which consists of a simple random component and a test-result-dependent compo...
This paper provides approaches for automated support of citation screening in systematic reviews. Continuous active learning is chosen as our baseline approach, above which, two data balancing techniques are applied to handle the imbalance problem. These two techniques, aggressive undersampling and reweighting are tested and compared on 20 data sets for Diagnostic Test Accuracy (DTA) reviews. R...
Background Contrast-enhanced (CE) whole-heart coronary MRA is a promising technique for CAD detection [1]. However, the current imaging time is relatively long and variable, and the spatial resolution is limited. The aim of this work is to develop and evaluate a 3D projection reconstruction (3DPR) based CE coronary MRA technique that achieves (1.0 mm) spatial resolution and 5-minute scan time, ...
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