PP: UMAP: uniform manifold approximation and projection for dimension reduction

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From Tutte institute for mathematics and computing

Problem: dimension reduction

Theoretical foundations:

Methodology:

Two phases.

In the first phase, a particular weighted k-neighbour graph is constructed. In the second phase, a low dimensional layout of this graph is computed

 

 

 

Supplementary knowledge:

1. simplicial sets. 单纯集

In mathematics, a simplicial set is an object made up of "simplices单纯形" in a specific way. Simplicial sets are higher-dimensional generalizations of directed graphspartially ordered sets and categories

simplex: 单纯形, 

In geometry, a simplex (plural: simplexes or simplices) is a generalization of the notion of a triangle or tetrahedron四边形 to arbitrary dimensions.

For example,

2. Hadamard product/ pointwise product

3. 

 

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