x_0 ——> x_t-1 ——> x_t
0 ——> A ——> B
逆转时空
p(A|B)=p(B|A)*P(A) / P(B)
p( x_t-1 | x_t , x_0 ) = p( x_t | x_t-1 ) * P( x_t-1 | x_0 ) / P( x_t | x_0 )
x_0 ——> x_t-1 ——> x_t
0 ——> A ——> B
逆转时空
p(A|B)=p(B|A)*P(A) / P(B)
p( x_t-1 | x_t , x_0 ) = p( x_t | x_t-1 ) * P( x_t-1 | x_0 ) / P( x_t | x_0 )