D_KL(P(x_i|z_i)||P(x_i))_+_α·D_KL(Q(z_i)||P(z_i|Σ)) - Miyabi

D_KL(P(x_i|z_i)||P(x_i))_+_α·D_KL(Q(z_i)||P(z_i|Σ))