∘
Φ
\circ_Φ
∘Φ denotes a convolution
Let
b
l
o
c
k
d
i
a
g
blockdiag
blockdiag(A) be a n1n3-by-n2n3 block diagonal matrix,
f
o
l
d
fold
fold indicate its inverse operator
diagonal degree tensor
D
\mathcal{D}
D
作者未提供代码