Unsupervised image categorization and affinity propagation clustering
AP (Affinity Propagation) finds a set of exemplars, 
, in the dataset and assigns nonselected points to the exemplars. An exemplar is the representative of a cluster.
Two types of messages are exchanged between data objects or points; they are explained here:
-
The r(i,k) message, which is called responsibility, represents the accumulated evidence sent from
to 
. It informs us that
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