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Table 9: 
Ablation study for modules used in the graph encoder and the LSTM decoder.
ModelBC
DCGCN4 25.5 55.4 
 
Encoder Modules 
-Linear Combination 23.7 53.2 
-Global Node 24.2 54.6 
-Direction Aggregation 24.6 54.6 
-Graph Attention 24.9 54.7 
-Global Node&Linear Combination 22.9 52.4 
 
Decoder Modules 
-Coverage Mechanism 23.8 53.0 
ModelBC
DCGCN4 25.5 55.4 
 
Encoder Modules 
-Linear Combination 23.7 53.2 
-Global Node 24.2 54.6 
-Direction Aggregation 24.6 54.6 
-Graph Attention 24.9 54.7 
-Global Node&Linear Combination 22.9 52.4 
 
Decoder Modules 
-Coverage Mechanism 23.8 53.0 
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