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. 2021 Nov 25;272(4):603–619. doi: 10.1007/s00406-021-01358-5
(i) Output: si=σjwijsj si: yi observed (i = 1,2,… Ni)
(j) Hidden layers: sj=σkwjksk (j = 1,2,… Nj)
(k) Input: sk=xk xk observed (k = 1,2,… Nk)