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Journal Articles Foundations of Data Science Year : 2021

## Generalized penalty for circular coordinate representation

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Hengrui Luo
• Function : Author
Alice Patania
• Function : Author
Jisu Kim
• Function : Author
• PersonId : 1060470
Mikael Vejdemo-Johansson
• Function : Author

#### Abstract

Topological Data Analysis (TDA) provides novel approaches that allow us to analyze the geometrical shapes and topological structures of a dataset. As one important application, TDA can be used for data visualization and dimension reduction. We follow the framework of circular coordinate representation, which allows us to perform dimension reduction and visualization for high-dimensional datasets on a torus using persistent cohomology. In this paper, we propose a method to adapt the circular coordinate framework to take into account the roughness of circular coordinates in change-point and high-dimensional applications. We use a generalized penalty function instead of an $L2$ penalty in the traditional circular coordinate algorithm. We provide simulation experiments and real data analysis to support our claim that circular coordinates with generalized penalty will detect the change in high-dimensional datasets under different sampling schemes while preserving the topological structures.

### Dates and versions

hal-03501929 , version 1 (24-12-2021)

### Identifiers

• HAL Id : hal-03501929 , version 1
• ARXIV :
• DOI :

### Cite

Hengrui Luo, Alice Patania, Jisu Kim, Mikael Vejdemo-Johansson. Generalized penalty for circular coordinate representation. Foundations of Data Science, 2021, 3 (4), pp.729-767. ⟨10.3934/fods.2021024⟩. ⟨hal-03501929⟩

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