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Table 4: 
Development results of models with three different encoders and two different decoders. A+B represents the model with A encoder and B decoder. RNN encoder and decoder are abbreviated to RNN, Transformer encoder and decoder are abbreviated to TFM and our Graph encoder are abbreviated to Graph.
MethodsBLEUBLEU
(LDC2015E86)(LDC2017T10)
RNN+RNN (S2S) 21.2 22.3 
RNN+TFM 17.9 18.7 
TFM+RNN 16.0 17.9 
TFM+TFM (Transformer) 17.4 19.0 
Graph+RNN 21.1 25.2 
Graph+TFM (Ours) 25.5 28.8 
MethodsBLEUBLEU
(LDC2015E86)(LDC2017T10)
RNN+RNN (S2S) 21.2 22.3 
RNN+TFM 17.9 18.7 
TFM+RNN 16.0 17.9 
TFM+TFM (Transformer) 17.4 19.0 
Graph+RNN 21.1 25.2 
Graph+TFM (Ours) 25.5 28.8 
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