---
type: learning
area: learning
status: learning
date: 2026-05-03
created: 2026-05-03
updated: 1980-01-01
tags:
  - learning
---
- Most used unsupervised algorithms 
- Used for dimensiality reduction
- reduce a d-dimensional dataset to k-dimensional subspace where (k<d)
- Highly effected by outliers