Clustering. Instructor: Max Welling ICS 178 Machine Learning & Data Mining. Unsupervised Learning. In supervised learning we were given attributes & targets (e.g. class labels). In unsupervised learning we are only given attributes. Our task is to discover structure in the data.
Instructor: Max Welling
ICS 178 Machine Learning & Data Mining
Is this a good clustering?
Nr. of data-cases in cluster c
Set of data-cases assigned to cluster c
the shape of these contours
total responsibility claimed by cluster “c”
expected fraction of data-cases assigned to this cluster
weighted sample mean where every data-case is weighted
according to the probability that it belongs to that cluster.
weighted sample covariance
Every data-case is a cluster
produces minimal spanning tree.
avoids elongated clusters.