Using an encoder-decoder backbone, our model may be regarded as an extension of the constituent parsing model of BIBREF18 as shown in Figure FIGREF4. The difference is that in our model both constituent and dependency parsing share the same token representation and shared self-attention layers and each has its own individual Self-Attention Layers and subsequent processing layers. Our model includes four modules: token representation, self-attention encoder, constituent and dependency parsing decoder. Constituent Parsing Decoder Dependency Parsing Decoder 
 Question: What are the models used to perform constituency and dependency parsing?
token representation self-attention encoder, Constituent Parsing Decoder  Dependency Parsing Decoder