Then the representation of each node is updated with graph convolution operation with normalization factor (Kipf and Welling, 2017) as below: where g l−1 j ∈ R 2d h is the j-th token's representation evolved from the preceding GCN layer while h l i ∈ R 2d h is the product of current GCN layer, and A ij is degree of the i-th token in the tree.
(2014) containing twitter posts, while the other four (LAP14, REST14, REST15, REST16) are respectively from SemEval 2014 task 4 (Pontiki et al., 2014), SemEval 2015 task 12 (Pontiki et al., 2015) and SemEval 2016 task 5 (Pontiki et al., 2016), consisting of data from two categories, i.e.