... The CDS bibliographical map is a tool for organizing astronomical text documents into a meaningful map for exploration and search. ... This network contains two layers of nodes: an input layer, and a mapping (output) layer in the shape of a two-dimensional grid. ... The number of nodes is equal to the number of attributes associated with the input. ... The mapping nodes are initialized with random numbers. ... At the end of the training of a map, the number of documents assigned to each node is...