Fig. 2.

A graphical representation of our model. (Left) Standard plate notation is used. The circles inside the plate represent the component probability distributions over categories (π), sign types (σ), and signs (Φ). The circles outside represent hyperparameters (on priors) that affect the shape of these distributions or their number of parameters. The solid arrows reflect dependencies between variables. (Right) The process of generating a tree. The circles represent nodes in the tree that correspond to either categories or signs. The solid arrows represent dependencies between nodes. The dashed arrows between the plate and the tree tell us from which distributions the values of the nodes are drawn.