A graph or network is said to be fully connected if there is a link between every possible pair of nodes. The term is also often applied to adjacent layers in a neural network in tbis case it measnthat each node in one layer is connecetd to verey node in the next layer, but not that the nodes within a layer itself are connected.
Used in Chap. 6: pages 84, 88, 89, 90, 92; Chap. 7: page 107; Chap. 8: page 112; Chap. 9: page 135
Boltzmann Machine – a fully connected network
Restricted Boltzmann Machine – fully connected between layers, but not within layers