PCA, t-SNE, UMAP
Is a dataset with 20 columns really 20 dimensional? Usually not. And finding that out both speeds things up and makes them easier to understand.
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Sources
- Pearson, K. 1901 · On Lines and Planes of Closest Fit to Systems of Points in Space · Philosophical Magazine, 2(11)
- Hotelling, H. 1933 · Analysis of a Complex of Statistical Variables into Principal Components · J. Educational Psychology, 24
- van der Maaten, L. & Hinton, G. 2008 · Visualizing Data using t-SNE · JMLR, 9, 2579–2605
- McInnes, Healy, Melville 2018 · UMAP: Uniform Manifold Approximation and Projection · arXiv:1802.03426
- Wattenberg, Viégas, Johnson 2016 · How to Use t-SNE Effectively · Distill
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