Evolutionary Prediction of Nonstationary Event Popularity Dynamics of Weibo Social Network Using Time-Series Characteristics

Algorithm 2

Kalman forward-backward smoothing algorithm.

	Input: State filter mean and covariance at time .
	Output: State mean estimate and covariance estimate at time .
(1)	ifthen
(2)	equation (13)
(3)	else ifthen
(4)	fordo
(5)	equation (14)
(6)	equation (15)
(7)	.
(8)	end
(9)	end