Partitional Clustering 00 O 0 o O O O O 00 o 0 Partitions set into all clusters simultaneously
Partitional Clustering • Partitions set into all clusters simultaneously
Partitional Clustering 0 0 0 Partitions set into all clusters simultaneously
Partitional Clustering • Partitions set into all clusters simultaneously
K-Means Clustering Simple Partitional Clustering Choose the number of clusters.k Choose k points to be cluster centers 。Then
K-Means Clustering • Simple Partitional Clustering • Choose the number of clusters, k • Choose k points to be cluster centers • Then…
K-Means Clustering iterate Compute distance from all points to all k- centers Assign each point to the nearest k-center Compute the average of all points assigned to all specific k-centers Replace the k-centers with the new averages ]
K-Means Clustering iterate { Compute distance from all points to all kcenters Assign each point to the nearest k-center Compute the average of all points assigned to all specific k-centers Replace the k-centers with the new averages }
But! The complexity is pretty high: -k n O(distance metric )num (iterations) 0 Moreover,it can be necessary to send tons of data to each Mapper Node. Depending on your bandwidth and memory available,this could be impossible
But! • The complexity is pretty high: – k * n * O ( distance metric ) * num (iterations) • Moreover, it can be necessary to send tons of data to each Mapper Node. Depending on your bandwidth and memory available, this could be impossible