SummarizingsourcecodewithHeterogeneousSyntaxGraphanddualpositionAbstract1.Introduction2.HSGanddualposition2.1HSGconstruction2.2Codetokenswithdualpositions3.HetSummodel3.1Overview3.2Embeddings3.3.Codetokenencoder3.4HSGencoder3.5Summarydecoder3.6.Copyingmechanism4.Experiment4.1Experimentalresults4.2Ab