In this task, you will be presented with a context from an academic paper and a question separated with a 
. You have to answer the question based on the context.
Q: We use three encoder-decoder neural architectures as baselines: (1) LSTM+attention as an LSTM BIBREF19 with attention mechanism BIBREF20; (2) Transformer BIBREF21 and (3) Universal Transformer BIBREF22. 
 Question: What three machine architectures are analyzed?
A: 
LSTM+attention Transformer  Universal Transformer