Solved by LeviViana in post #2 
              
              
                This way: 
import torch
t_1 = [[0.1,0.2,0.3],[0.4,0.5,0.6]]
t_2 = [[1,2,3],[4,5,6]]
t_3 = [[10,20,30],[40,50,60]]
x = torch.Tensor(t_1 + t_2 + t_3)
n_1 = x[::2]
n_2 = x[1::2]