Ensemble, which selects a sentence using 100 agents trained on clustered dialogues as described in section SECREF4 – the agent in focus is chosen using a regressor as predictor of dialogue reward INLINEFORM0 using a similar neural net as the ChatDQN agents except for the final layer having one node and using Batch Normalisation BIBREF44 between hidden layers as in BIBREF36 ; 
 Question: How many agents do they ensemble over?
100 