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Graphical representation of Markov random field regularized LDA; if two words are correlated according to the external knowledge, an undirected edge between their topic labels is created. Finally, a graph in which nodes are latent topic labels and edges connect topic labels of semantically related words. In this example, the graph contains five nodes 
, 
, 
, 
, 
and four edges (
, 
), (
, 
), (
, 
) and (
, 
).
