topicmodels (version 0.0-6)

build_graph: Construct the adjacency matrix for a topic graph

Description

The lasso is used to determine which edges are present in a topic graph.

Usage

build_graph(x, lambda, and = TRUE)

Arguments

x

Object of class "CTM".

lambda

Numeric in $[0,1]$ indicating the relative bound on the L1-norm of the parameters.

and

Logical; if TRUE the graph is computed by taking the intersection of the neighbors, otherwise the union is determined.

Value

• Returns an adjacency matrix for the topics versus topics graph.

References

Blei D.M., Lafferty J.D. (2007). A Correlated Topic Model of Science. The Annals of Applied Statistics, 1(1), 17--35.