Federated Multitask Learning with Manifold Regularization for Face Spoof Attack Detection

Algorithm 1

Details of training FedFSAD.

	Input: Image , initialized
	Output: Multitask face spoof attack detection model.
(1)	Local model learning:
(2)	Extract LBP features of and get ;
(3)	Compute feature similarities with (15);
(4)	for all each task do
(5)	Compute with (12);
(6)	Compute with (13);
(7)	Compute with (10);
(8)	Compute with (14);
(9)	Compute with (11);
(10)	Compute ;
(11)	Update and with (1);
(12)	Solve dual problem with (3);
(13)	end for
(14)	Global model learning:
(15)	Train the multi-task model with (4);
(16)	return The multi-task model;