The specific model is shown in Figure 2, consisting of a factorial conditional random field (FCRF; ) with neural network potentials calculated by long short-term memory (LSTM; (Hochreiter and Schmidhuber, 1997)) at every variable node ( §3).
learning and inference in the model is made 2 the latter is common because many UD resources were created by full or semi-automatic conversion from treebanks with less comprehensive annotation schemes than UD.