Landmark-Based Facial Feature Construction and Action Unit Intensity Prediction

Algorithm 1

The training algorithm of the neutral networks for AU intensity estimation.

(1)	step = 1
(2)	n = 0
(3)	While (NN is not convergent)
(4)	{
(5)	n = n + 1
(6)	If (n < 10)
(7)	{add cell and training NN}
(8)	Else{
(9)	If [mse (n − 9), mse(n − 8),..., mse (n)] is concave
(10)	{
(11)	step = step + 1
(12)	add cell and training NN
(13)	}
(14)	Else [mse (n − 9), mse (n − 8),…, mse (n)] is convex
(15)	{
(16)	step = 1
(17)	add cell and training NN
(18)	}}}
(19)	Train done