1 code implementation • 16 Oct 2021 • Yikun Zhang, Yen-Chi Chen
The set of local modes and the ridge lines estimated from a dataset are important summary characteristics of the data-generating distribution.
2 code implementations • 29 Apr 2021 • Yikun Zhang, Yen-Chi Chen
This paper studies the linear convergence of the subspace constrained mean shift (SCMS) algorithm, a well-known algorithm for identifying a density ridge defined by a kernel density estimator.
1 code implementation • 25 Jan 2021 • Yikun Zhang, Yen-Chi Chen
Under the (generalized) EM framework, we provide a new proof for the ascending property of density estimates and demonstrate the global convergence of directional mean shift sequences.
1 code implementation • 23 Oct 2020 • Yikun Zhang, Yen-Chi Chen
Directional data consist of observations distributed on a (hyper)sphere, and appear in many applied fields, such as astronomy, ecology, and environmental science.
5 code implementations • 27 Sep 2020 • Zhuonan He, Yikun Zhang, Yu Guan, Shanzhou Niu, Yi Zhang, Yang Chen, Qiegen Liu
Dose reduction in computed tomography (CT) is essential for decreasing radiation risk in clinical applications.