Table 2.

List of notations

Notation	Definition
$c=\{x_1,x_2,...,x_n,S\}$	The event
$S=\{S^{(1)},S^{(2)},...,S^{(T)}\}$	The propagation structure
$x_1$	The source post
$x_j$	The $j-1-th$ comment
T	The number of divisions
C	The event set
Y	The label set
k	The number of categories
$S^{(t)}$	The $t-th$ propagation substructure
$V^{(t)}=\{x_1,x_2,...,x_{n^{(t)}}\}$	The nodes on $S^{(t)}$
$E^{(t)}$	The set of edges on $S^{(t)}$
$\mathbf{B}$	The affine transformation matrix
${{\mathit{h}}_i}^{(l)}$	The representation of the $i-th$ graph node after l graph attention layers
$\mathbf{H}\in {\mathbb{R}}^{N\times p\times d_m}$	The global features of nodes
$r\in {\mathbb{R}}^{d_r}$	The source post feature
${\mathbf{H}}^{{}^{\prime }}\in {\mathbb{R}}^{N\ast q\ast d_c}$	The primary capsules
$\mathbf{U}\in {\mathbb{R}}^{N\times q\times d_c}$	The normalized primary capsules
${\mathit{v}}_j$	The substructure classification capsule j
$\mathbf{I}\in {\mathbb{R}}^{k\ast f}$	The final classification capsules
${\tilde{T}}_i$	The indicator function of classification
$\lambda$	The scaling factor