Task: Question Answering
Input (English): We introduce here the use of an L-PCFG with two layers of latent states: one layer is intended to capture the usual syntactic information, and the other aims to capture semantic and topical information by using a large set of states with specific feature functions. 
 Question: What latent variables are modeled in the PCFG?
Output (English): syntactic information semantic and topical information