Unsupervised Learning!

Principle components analysis


K-means Clustering


1. Assign data points to a group
2. Iterate through until no change:
   1. Find centroid
   2. Find the point that is closest to the centroids. Assign that data point to the corresponding group of the centroids.

.. admonition:: How Many Groups
   :class: warning

   The art of chosing K.

Hierarchical Clustering

Bottom-up hierarchical groups can be read out from dendrogram.

References and Notes