2 ms·
Good point, a look at the contents of the wikipedia page for dimensionality reduction makes it clear - https://en.wikipedia.org/wiki/Dimensionality_reduction ht
by jstx1 5y ago
Good point, a look at the contents of the wikipedia page for dimensionality reduction makes it clear - https://en.wikipedia.org/wiki/Dimensionality_reduction https://en.wikipedia.org/wiki/Dimensionality_reduction
Dimensionality reduction:
1. Feature selection.
2. Feature projection.
2.1 PCA
So you could say that feature selection is dimensionality reduction but you can't say that PCA is feature selection.
- mywittyname 5y ago> but you can't say that PCA is feature selection. One of the steps in PCA is to select the top N eigenvectors sorted by eigenvalues. So while it is not feature selection, it can be argued that it involves a feature selection step.