Algorithm 4:

Graph2Img (U, P, w)

Input: (1) Graph G(V, E)

(2) Matrix of graph nodes representations ΦϵR|V| × d

Output: Image I1 representing graph

1: Initialization: Let all pixels of I1 to be zero

2: Re-organize ? by PCA method

3: Build a matrix M1 using the first two features of all nodes

4: for i = 1 to |V| do

5: x = $f_1^{v_i}$

6: y = $f_2^{v_i}$

7: Let I1 (x, y) added by 1

8: end for