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Overview of different types of Boltzmann machines. The visible nodes are depicted as doubled circles, hidden nodes are single circles. a: General Boltzmann machine, with all nodes connected to each other. b: Restricted Boltzmann machines, with two layers of nodes. c: Deep belief network (DBN) or deep Boltzmann machine (DBM), consisting of multiple layers. The architecture of DBNs and DBMs is the same but the algorithms for training and sampling are different
